{ "modality": "Radiography", "exam_facts": { "scored_questions": 200, "pilot_questions": 30, "time_limit_minutes": 230, "spec_version": "ARRT Radiography Examination Content Specifications effective January 1, 2022 (board approved January 2021), in effect for exams taken through February 28, 2027. A revised version takes effect March 1, 2027 (Patient Care 31, Safety 46, Image Production 51, Procedures 72; still 200 scored + 30 pilot questions).", "source_url": "https://assets-us-01.kc-usercontent.com/406ac8c6-58e8-00b3-e3c1-0c312965deb2/c28cf141-f45c-44ef-acde-984929886e01/RAD_CS_2022.pdf" }, "content_categories": [ { "name": "Patient Care", "scored_questions": 33, "subcategories": [ { "name": "Patient Interactions and Management", "scored_questions": 33 } ] }, { "name": "Safety", "scored_questions": 50, "subcategories": [ { "name": "Radiation Physics and Radiobiology", "scored_questions": 21 }, { "name": "Radiation Protection", "scored_questions": 29 } ] }, { "name": "Image Production", "scored_questions": 51, "subcategories": [ { "name": "Image Acquisition and Evaluation", "scored_questions": 26 }, { "name": "Equipment Operation and Quality Assurance", "scored_questions": 25 } ] }, { "name": "Procedures", "scored_questions": 66, "subcategories": [ { "name": "Head, Spine and Pelvis Procedures", "scored_questions": 18 }, { "name": "Thorax and Abdomen Procedures", "scored_questions": 20 }, { "name": "Extremity Procedures", "scored_questions": 28 } ] } ], "sections": [ { "id": "patient-care", "name": "Patient Care", "main_points": [ "Confirm patient identity with at least two identifiers (such as full name and date of birth) and check that the order matches the clinical indication before any exposure.", "Informed consent is required for invasive or higher-risk procedures; the patient must be competent, told the risks, benefits and alternatives, and may withdraw consent at any time.", "Know the legal terms: battery is unauthorized touching (including imaging a patient who refused), negligence is failure to use reasonable care, and malpractice is professional negligence.", "Respondeat superior holds the employer liable for an employee's acts on the job; res ipsa loquitur ('the thing speaks for itself') shifts the burden of proof to the defendant.", "Use good body mechanics for transfers: wide base of support, load held close, bend at the knees, avoid twisting, and use aids such as slider boards, gait belts and mechanical lifts.", "Normal adult vital signs: pulse 60-100 beats/min, respirations 12-20 breaths/min, blood pressure below 120/80 mm Hg, oral temperature about 37 C (98.6 F), and SpO2 of 95-100%.", "Keep IV bags about 18-24 inches above the vein, keep urinary drainage bags below bladder level, and never disconnect or clamp tubes or oxygen without proper orders.", "The chain of infection has six links (pathogen, reservoir, portal of exit, mode of transmission, portal of entry, susceptible host); hand hygiene is the single most effective way to break it.", "Standard Precautions apply to every patient; add airborne (N95, negative-pressure room: TB, measles, varicella), droplet (mask: influenza, pertussis) or contact (gown and gloves: MRSA, C. difficile) precautions as indicated.", "Check renal function (creatinine, eGFR) and allergy history before iodinated contrast; use water-soluble iodinated contrast instead of barium when bowel perforation is suspected.", "Classify contrast reactions as mild (limited hives, nausea), moderate (diffuse hives, bronchospasm, facial swelling) or severe (laryngeal edema, profound hypotension, cardiac arrest); epinephrine is the first-line drug for anaphylaxis.", "In a medical emergency, call for help and start high-quality CPR (100-120 compressions/min, at least 2 in deep, 30:2 for adults) and use an AED as soon as one is available." ], "vocabulary": [ { "term": "Informed consent", "definition": "Voluntary permission given by a competent patient after being told the risks, benefits and alternatives of a procedure." }, { "term": "Implied consent", "definition": "Consent assumed when a patient is unconscious or in an emergency and a reasonable person would agree to care." }, { "term": "Battery", "definition": "Intentional touching or treating of a person without their consent." }, { "term": "Negligence", "definition": "Failure to exercise the care a reasonable person would use in similar circumstances." }, { "term": "Malpractice", "definition": "Negligence committed by a professional in the course of their professional duties." }, { "term": "Respondeat superior", "definition": "Legal doctrine making an employer responsible for the actions of employees acting within their job." }, { "term": "Res ipsa loquitur", "definition": "Legal doctrine meaning 'the thing speaks for itself,' used when the injury could only have resulted from negligence." }, { "term": "HIPAA", "definition": "U.S. federal law that protects the privacy and security of patients' health information." }, { "term": "Advance directive", "definition": "Legal document, such as a living will or health care proxy, stating a patient's wishes for future care." }, { "term": "Fomite", "definition": "An inanimate object, such as a cassette or bed rail, that can carry infectious organisms." }, { "term": "Nosocomial infection", "definition": "An infection acquired while receiving care in a healthcare facility (healthcare-associated infection)." }, { "term": "Surgical asepsis", "definition": "Sterile technique that eliminates all microorganisms from an area or object." }, { "term": "Neutropenic precautions", "definition": "Reverse isolation that protects an immunocompromised patient from infection carried by others." }, { "term": "Extravasation", "definition": "Leakage of injected fluid or contrast from the vein into surrounding tissue." }, { "term": "Vasovagal reaction", "definition": "A reaction marked by low blood pressure with a slow heart rate, often with pallor and fainting." }, { "term": "Anaphylaxis", "definition": "A severe, potentially fatal systemic allergic reaction affecting breathing and circulation." }, { "term": "eGFR", "definition": "Estimated glomerular filtration rate, a calculated measure of kidney function used to screen before contrast." }, { "term": "Trendelenburg position", "definition": "Supine position with the head lower than the feet." } ], "quiz": [ { "q": "A patient clearly refuses a chest X-ray, but the radiographer performs it anyway. Which legal wrong has most likely occurred?", "options": [ "Slander", "False imprisonment", "Battery", "Res ipsa loquitur" ], "answer_index": 2, "explanation": "Touching or treating a patient without consent is battery. Slander is spoken defamation and res ipsa loquitur is a doctrine, not a wrong." }, { "q": "Which pair of identifiers best meets the standard for verifying a patient before imaging?", "options": [ "Full name and date of birth", "Room number and diagnosis", "Ordering physician and room number", "Exam type and bed number" ], "answer_index": 0, "explanation": "Two person-specific identifiers such as full name and date of birth are required; room or bed numbers can change and are not identifiers." }, { "q": "A hospital is named in a lawsuit because of an error made by one of its radiographers on duty. Which doctrine applies?", "options": [ "Res ipsa loquitur", "Primum non nocere", "Beneficence", "Respondeat superior" ], "answer_index": 3, "explanation": "Respondeat superior ('let the master answer') makes the employer liable for employees' acts within the scope of employment." }, { "q": "A patient with suspected pulmonary tuberculosis needs a portable chest X-ray. Which precautions should the radiographer use?", "options": [ "Contact precautions with gown and gloves only", "Airborne precautions with a fitted N95 respirator", "Neutropenic precautions", "Droplet precautions with a surgical mask" ], "answer_index": 1, "explanation": "TB spreads by airborne droplet nuclei, so airborne precautions with an N95 respirator (and a negative-pressure room) are required." }, { "q": "After imaging a patient with Clostridioides difficile, what is the preferred hand hygiene method?", "options": [ "Alcohol-based hand rub", "Gloves alone without handwashing", "Chlorhexidine wipes only", "Washing with soap and water" ], "answer_index": 3, "explanation": "Alcohol does not reliably kill C. difficile spores; mechanical washing with soap and water removes them." }, { "q": "Which value falls within the normal adult resting range?", "options": [ "Pulse of 72 beats/min", "Pulse of 120 beats/min", "Respiratory rate of 28 breaths/min", "SpO2 of 86%" ], "answer_index": 0, "explanation": "A normal adult pulse is 60-100 beats/min. The other values indicate tachypnea, tachycardia and hypoxemia." }, { "q": "During a contrast injection, a patient becomes pale and faint, with a blood pressure of 80/50 mm Hg and a pulse of 48 beats/min. This most likely indicates:", "options": [ "a hyperglycemic crisis", "anaphylactic shock", "a vasovagal reaction", "contrast extravasation" ], "answer_index": 2, "explanation": "Hypotension with bradycardia is the hallmark of a vasovagal reaction; anaphylaxis typically causes hypotension with tachycardia." }, { "q": "A small bowel perforation is suspected and a contrast study is ordered. Which contrast agent is most appropriate?", "options": [ "Barium sulfate suspension", "Carbon dioxide gas by mouth", "Gadolinium-based contrast", "Water-soluble iodinated contrast" ], "answer_index": 3, "explanation": "Barium leaking into the peritoneal cavity can cause severe peritonitis, so a water-soluble iodinated agent is used when perforation is suspected." }, { "q": "Which laboratory value is most important to review before giving IV iodinated contrast to an at-risk patient?", "options": [ "Hemoglobin A1c", "Estimated glomerular filtration rate (eGFR)", "Serum potassium", "Prothrombin time" ], "answer_index": 1, "explanation": "Iodinated contrast is cleared by the kidneys; eGFR (with creatinine) screens for risk of contrast-associated kidney injury." }, { "q": "When moving a patient from a wheelchair to the X-ray table, the radiographer should FIRST:", "options": [ "lock the wheelchair wheels", "raise the footrests after the patient stands", "pull the patient up by the arms", "lower the table after the patient sits" ], "answer_index": 0, "explanation": "Locking the wheels keeps the chair from rolling away and is the first safety step in any wheelchair transfer." }, { "q": "A patient's IV infusion stops dripping while the arm is raised overhead for a positioning step. The best initial action is to:", "options": [ "remove the IV catheter", "increase the pump rate", "disconnect the tubing to check flow", "reposition the arm and keep the bag about 18-24 inches above the site" ], "answer_index": 3, "explanation": "Gravity flow depends on the bag being well above the vein; repositioning usually restores the flow. Radiographers should not remove or disconnect IV lines." }, { "q": "Which finding signals a SEVERE contrast reaction that requires activating the emergency response?", "options": [ "A few scattered hives", "Brief nausea with one episode of vomiting", "Stridor from laryngeal edema", "A feeling of warmth during injection" ], "answer_index": 2, "explanation": "Laryngeal edema threatens the airway and is classed as severe; the other findings are mild, expected or self-limited effects." } ], "bank": [ { "q": "To keep an anxious but competent adult from leaving before the exam is finished, a radiographer locks the exam room door. This is most likely:", "options": [ "Assault", "Res ipsa loquitur", "Libel", "False imprisonment" ], "answer_index": 3, "explanation": "Confining a competent patient against their will, without legal justification, is false imprisonment.", "subcategory": "Patient Interactions and Management" }, { "q": "A radiographer discusses a patient's new cancer diagnosis with a coworker in a crowded hospital elevator. Which patient right has been violated?", "options": [ "Extent of care", "Informed consent", "Research participation", "Confidentiality of health information (HIPAA)" ], "answer_index": 3, "explanation": "Disclosing protected health information where others can overhear breaches confidentiality under the HIPAA Privacy Rule.", "subcategory": "Patient Interactions and Management" }, { "q": "Which part of the ARRT Standards of Ethics is mandatory and enforceable, so that violations can lead to sanctions?", "options": [ "ASRT Practice Standards", "Code of Ethics", "AHA Patient Care Partnership", "Rules of Ethics" ], "answer_index": 3, "explanation": "The Code of Ethics is aspirational; the Rules of Ethics are mandatory standards that ARRT enforces.", "subcategory": "Patient Interactions and Management" }, { "q": "A patient with a valid, documented do-not-resuscitate (DNR) order stops breathing during an exam. The radiographer should:", "options": [ "Start chest compressions until the code team arrives", "Finish the exam quickly, then report the event", "Attach the AED and deliver a shock", "Call for the nurse or physician and not begin CPR" ], "answer_index": 3, "explanation": "A valid DNR order must be honored; summon the care team and document, but do not start resuscitation.", "subcategory": "Patient Interactions and Management" }, { "q": "An adult outpatient's blood pressure is measured at 150/95 mm Hg. This reading is classified as:", "options": [ "Hypotension", "Hypertension", "Orthostatic hypotension", "Normal" ], "answer_index": 1, "explanation": "Adult blood pressure at or above 140/90 mm Hg falls in the hypertension range (normal is below 120/80).", "subcategory": "Patient Interactions and Management" }, { "q": "A patient arrives on oxygen by nasal cannula. Which flow rate range is typical for this device?", "options": [ "10 to 15 L/min", "1 to 6 L/min", "0.1 to 0.5 L/min", "20 to 30 L/min" ], "answer_index": 1, "explanation": "Nasal cannulas usually deliver 1-6 L/min; higher flows require a mask such as a non-rebreather.", "subcategory": "Patient Interactions and Management" }, { "q": "When performing adult CPR, chest compressions should be delivered at a rate of:", "options": [ "60 to 80 per minute", "130 to 150 per minute", "100 to 120 per minute", "80 to 100 per minute" ], "answer_index": 2, "explanation": "Current guidelines call for adult compressions at 100-120/min and at least 2 inches (5 cm) deep.", "subcategory": "Patient Interactions and Management" }, { "q": "A diabetic outpatient who has fasted all morning for an exam becomes sweaty, shaky and confused. The most likely cause is:", "options": [ "Orthostatic hypotension", "Hypoglycemia", "Diabetic ketoacidosis", "A mild contrast reaction" ], "answer_index": 1, "explanation": "Fasting while taking diabetic medication can drop blood sugar; give oral glucose if the patient is alert and get help.", "subcategory": "Patient Interactions and Management" }, { "q": "While on the table, a patient suddenly develops a drooping face on one side, slurred speech and weakness in one arm. The radiographer should suspect:", "options": [ "A stroke (cerebrovascular accident)", "A mild allergic reaction", "A vasovagal reaction", "Hyperventilation" ], "answer_index": 0, "explanation": "Sudden facial droop, arm weakness and speech difficulty are classic stroke signs; activate the emergency response and note the time of onset.", "subcategory": "Patient Interactions and Management" }, { "q": "A trauma patient with major bleeding has a rapid, weak pulse, cool clammy skin and falling blood pressure. This is most consistent with:", "options": [ "Neurogenic shock", "Hypovolemic shock", "Cardiogenic shock", "Septic shock" ], "answer_index": 1, "explanation": "Loss of blood volume causes hypovolemic shock, with compensatory tachycardia and cool, pale skin.", "subcategory": "Patient Interactions and Management" }, { "q": "Which transmission-based precaution is used for a patient with seasonal influenza?", "options": [ "Airborne precautions", "Neutropenic (reverse) isolation", "Droplet precautions", "Contact precautions only" ], "answer_index": 2, "explanation": "Influenza spreads by large respiratory droplets, so a surgical mask is worn in addition to standard precautions.", "subcategory": "Patient Interactions and Management" }, { "q": "A patient has a wound infected with MRSA. In addition to standard precautions, the radiographer should use:", "options": [ "Contact precautions with gown and gloves", "Neutropenic precautions", "Droplet precautions with a surgical mask only", "Airborne precautions with an N95 respirator" ], "answer_index": 0, "explanation": "MRSA spreads by direct and indirect contact, so a gown and gloves are required and equipment is disinfected afterward.", "subcategory": "Patient Interactions and Management" }, { "q": "During a sterile procedure, which part of a draped sterile table is considered sterile?", "options": [ "Any area behind a gowned person's back", "The outer 1-inch edge of the drape", "The tabletop surface inside the outer 1-inch border", "The drape hanging below the table level" ], "answer_index": 2, "explanation": "Only the top of the draped surface, excluding the 1-inch border, is sterile; anything below table level is not.", "subcategory": "Patient Interactions and Management" }, { "q": "Proper hand hygiene interrupts the chain of infection mainly at which link?", "options": [ "Susceptible host", "Mode of transmission", "Portal of exit", "Reservoir" ], "answer_index": 1, "explanation": "Clean hands stop pathogens from being carried from one person or surface to another, breaking the mode of transmission.", "subcategory": "Patient Interactions and Management" }, { "q": "Compared with ionic high-osmolality iodinated contrast, nonionic low-osmolality contrast:", "options": [ "Is contraindicated in patients with asthma", "Causes fewer adverse reactions", "Dissociates into more particles in solution", "Contains barium sulfate" ], "answer_index": 1, "explanation": "Nonionic agents do not dissociate, have lower osmolality and are associated with fewer and milder adverse reactions.", "subcategory": "Patient Interactions and Management" }, { "q": "Per ACR guidance, a patient taking metformin with an eGFR of 25 mL/min/1.73 m² will receive IV iodinated contrast. What is recommended?", "options": [ "Give an extra metformin dose before the injection", "Withhold metformin at the time of contrast and for 48 hours afterward, restarting only after renal function is rechecked", "Stop metformin one week before the exam", "No change in metformin is needed at any eGFR" ], "answer_index": 1, "explanation": "With AKI or eGFR below 30, metformin is held for 48 hours after contrast because reduced renal clearance raises the risk of lactic acidosis.", "subcategory": "Patient Interactions and Management" }, { "q": "During a power injection of IV contrast, the site swells and the patient reports burning pain. The FIRST action is to:", "options": [ "Stop the injection", "Increase the injection rate to finish quickly", "Apply a tourniquet above the site", "Massage the area vigorously" ], "answer_index": 0, "explanation": "Suspected extravasation means stopping the injection at once, then elevating the limb, notifying the physician and documenting.", "subcategory": "Patient Interactions and Management" }, { "q": "Which medication is first-line treatment for anaphylaxis after contrast administration?", "options": [ "Atropine", "Nitroglycerin", "Epinephrine", "Diphenhydramine" ], "answer_index": 2, "explanation": "Epinephrine treats the airway swelling, bronchospasm and hypotension of anaphylaxis; antihistamines are adjuncts only.", "subcategory": "Patient Interactions and Management" }, { "q": "When moving a patient who has a chest tube, the drainage unit should be kept:", "options": [ "On the patient's abdomen", "Below the level of the chest", "Clamped for the entire exam", "Above shoulder level" ], "answer_index": 1, "explanation": "Keeping the unit below chest level prevents drainage from flowing back; routine clamping can cause a tension pneumothorax.", "subcategory": "Patient Interactions and Management" }, { "q": "An adult patient speaks only Haitian Creole and no staff member speaks it. The best way to explain the procedure is to:", "options": [ "Use a qualified medical interpreter, in person or by phone or video", "Skip the explanation because the exam is routine", "Speak slowly and loudly in English", "Ask the patient's 10-year-old child to translate" ], "answer_index": 0, "explanation": "Qualified medical interpreters protect accuracy and privacy; children and untrained relatives should not interpret clinical information.", "subcategory": "Patient Interactions and Management" }, { "q": "Who is responsible for obtaining informed consent for an invasive procedure such as an arthrogram?", "options": [ "The front-desk scheduler", "The referring physician's office staff", "The radiographer setting up the room", "The physician performing the procedure" ], "answer_index": 3, "explanation": "The physician who performs the procedure explains its risks, benefits and alternatives and obtains consent; others may only witness the signature.", "subcategory": "Patient Interactions and Management" }, { "q": "After a barium enema, which post-procedure instruction is most important to give the patient?", "options": [ "Take antacids to neutralize the barium", "Expect the stool to stay white for about a month", "Increase fluid intake (and use a laxative if instructed) to help expel the barium", "Avoid drinking fluids for 24 hours" ], "answer_index": 2, "explanation": "Retained barium can harden and cause constipation or impaction, so extra fluids and often a laxative are advised.", "subcategory": "Patient Interactions and Management" }, { "q": "A radiographer tells an uncooperative patient, \"If you move again, I will strap you to the table.\" Which legal wrong does this statement represent?", "options": [ "False imprisonment", "Assault", "Battery", "Defamation" ], "answer_index": 1, "explanation": "Assault is a threat that makes a person fear harmful or unwanted contact; battery requires actual touching.", "subcategory": "Patient Interactions and Management" }, { "q": "A technologist writes false, damaging statements about a coworker in an email sent to the department. This is an example of:", "options": [ "Assault", "Libel", "Invasion of privacy", "Slander" ], "answer_index": 1, "explanation": "Written defamation is libel; spoken defamation is slander.", "subcategory": "Patient Interactions and Management" }, { "q": "A patient is burned by a heating device left on during an exam, and the injury could not have happened without someone's carelessness. Which legal doctrine applies?", "options": [ "Corporate liability", "Informed consent", "Respondeat superior", "Res ipsa loquitur" ], "answer_index": 3, "explanation": "Res ipsa loquitur ('the thing speaks for itself') shifts the burden to the defendant when the injury would not occur without negligence.", "subcategory": "Patient Interactions and Management" }, { "q": "Which document names a specific person to make healthcare decisions if the patient becomes unable to decide?", "options": [ "Incident report", "Durable power of attorney for health care", "Living will", "Patient Care Partnership" ], "answer_index": 1, "explanation": "A durable power of attorney for health care appoints a proxy decision-maker; a living will states treatment wishes.", "subcategory": "Patient Interactions and Management" }, { "q": "A 16-year-old who is legally emancipated arrives for an exam that needs written consent. Who should sign the consent?", "options": [ "The patient", "A parent or legal guardian", "The radiology manager", "The referring physician" ], "answer_index": 0, "explanation": "An emancipated minor is legally treated as an adult and can give their own consent.", "subcategory": "Patient Interactions and Management" }, { "q": "Which ethical principle describes the radiographer's duty to avoid causing harm to the patient?", "options": [ "Nonmaleficence", "Veracity", "Beneficence", "Autonomy" ], "answer_index": 0, "explanation": "Nonmaleficence means 'do no harm'; beneficence means actively doing good.", "subcategory": "Patient Interactions and Management" }, { "q": "A patient asks the radiographer whether the images show a fracture. The most appropriate response is to:", "options": [ "Say the images look normal to reduce the patient's anxiety", "Point out the fracture so the patient knows what to expect", "Explain that the physician will review the images and discuss the results", "Tell the patient to look up the report online later today" ], "answer_index": 2, "explanation": "Interpreting images and giving diagnoses is outside the radiographer's scope of practice.", "subcategory": "Patient Interactions and Management" }, { "q": "A patient slips while getting off the table but appears uninjured. In addition to notifying the supervisor, the radiographer should:", "options": [ "Note in the medical record that an incident report was filed", "Document only if the patient later complains of pain", "Ask the patient to sign a statement releasing liability", "Complete an incident report describing the facts objectively" ], "answer_index": 3, "explanation": "Incidents are documented promptly and objectively on an incident report, which is not referenced in the patient's chart.", "subcategory": "Patient Interactions and Management" }, { "q": "When lifting a heavy object or helping move a patient, proper body mechanics include:", "options": [ "Twisting at the waist to turn toward the stretcher", "Keeping the legs straight and bending at the waist", "A wide base of support and lifting with the leg muscles", "Holding the load at arm's length from the body" ], "answer_index": 2, "explanation": "A broad base of support, a bent-knee lift and keeping the load close protect the back.", "subcategory": "Patient Interactions and Management" }, { "q": "A trauma patient with a possible spinal injury must be turned onto their side. The radiographer should use:", "options": [ "A two-person lift under the arms and knees", "A log roll with several staff moving the body as one unit", "A pivot transfer with the patient standing on one foot", "A sliding board after flexing the patient's neck" ], "answer_index": 1, "explanation": "The log roll keeps the spine aligned while turning a patient with a suspected spinal injury.", "subcategory": "Patient Interactions and Management" }, { "q": "A patient with right-sided weakness after a stroke is moved from a wheelchair to the table. The patient should move toward:", "options": [ "The left (unaffected) side", "The right (affected) side", "The side with the IV pole", "Whichever side is closer to the door" ], "answer_index": 0, "explanation": "Moving toward the strong side lets the patient bear weight and help with the transfer.", "subcategory": "Patient Interactions and Management" }, { "q": "An elderly patient has been lying supine for a long exam. Before standing, the patient should:", "options": [ "Roll prone and push up from the table", "Stand quickly so blood pressure rises", "Sit up slowly and dangle the legs for a moment", "Hold the breath while getting off the table" ], "answer_index": 2, "explanation": "Rising gradually helps prevent orthostatic hypotension, dizziness and falls.", "subcategory": "Patient Interactions and Management" }, { "q": "When pushing a patient in a wheelchair down a ramp, the safest technique is to:", "options": [ "Go down forward while tilting the chair onto its back wheels", "Release the chair briefly so it rolls down slowly", "Have the patient lean forward to keep the chair balanced", "Go down backward with the radiographer facing up the ramp" ], "answer_index": 3, "explanation": "Descending backward lets the radiographer control the chair and keeps the patient from sliding forward.", "subcategory": "Patient Interactions and Management" }, { "q": "When transporting a patient with an indwelling urinary (Foley) catheter, the drainage bag should be kept:", "options": [ "Below the level of the bladder", "Disconnected from the catheter tubing", "Above the level of the bladder", "Clamped and placed on the patient's abdomen" ], "answer_index": 0, "explanation": "Keeping the bag below the bladder prevents backflow of urine and reduces infection risk.", "subcategory": "Patient Interactions and Management" }, { "q": "A patient with chronic obstructive pulmonary disease (COPD) is on supplemental oxygen. Why is the flow usually kept low, such as 1-2 L/min?", "options": [ "High concentrations can depress the drive to breathe", "Low flow makes the oxygen tank last much longer", "High flow causes contrast reactions in COPD patients", "COPD lungs cannot absorb any oxygen above 2 L/min" ], "answer_index": 0, "explanation": "Some patients with COPD rely on low oxygen levels to stimulate breathing, so high oxygen can suppress respiration.", "subcategory": "Patient Interactions and Management" }, { "q": "Which pulse oximetry reading in an adult at rest should be reported to the nurse or physician right away?", "options": [ "98%", "100%", "88%", "96%" ], "answer_index": 2, "explanation": "A normal SpO2 is roughly 95-100%; a reading below 90% indicates significant hypoxemia.", "subcategory": "Patient Interactions and Management" }, { "q": "A resting adult has a pulse of 118 beats/min. This is described as:", "options": [ "Tachycardia", "Normal sinus rhythm", "Bradycardia", "Hypotension" ], "answer_index": 0, "explanation": "A resting adult pulse above 100 beats/min is tachycardia; below 60 is bradycardia.", "subcategory": "Patient Interactions and Management" }, { "q": "Which temperature route usually gives the highest reading in a healthy adult?", "options": [ "Temporal artery", "Rectal", "Oral", "Axillary" ], "answer_index": 1, "explanation": "Rectal temperatures run about 0.5-1 degree F higher than oral; axillary readings run lower.", "subcategory": "Patient Interactions and Management" }, { "q": "During an exam, a patient begins having a generalized seizure on the table. The radiographer should:", "options": [ "Hold the patient's arms and legs down firmly", "Give the patient water once the jerking slows", "Protect the patient from injury and call for help", "Place a bite block between the patient's teeth" ], "answer_index": 2, "explanation": "Prevent injury, never restrain or put objects in the mouth, and summon help.", "subcategory": "Patient Interactions and Management" }, { "q": "A patient standing for a PA chest says they feel lightheaded and their face becomes pale. The best first action is to:", "options": [ "Have the patient walk to the waiting room", "Give the patient a sugary drink and continue", "Finish the exposure quickly before they fall", "Help the patient lie down or sit and raise the legs" ], "answer_index": 3, "explanation": "Lowering the patient and raising the legs prevents a fall and improves blood flow to the brain.", "subcategory": "Patient Interactions and Management" }, { "q": "A conscious adult in the waiting room is choking, cannot speak and clutches the throat. The radiographer should:", "options": [ "Give the patient water to swallow", "Perform abdominal thrusts (Heimlich maneuver)", "Begin rescue breathing right away", "Wait for the patient to lose consciousness" ], "answer_index": 1, "explanation": "Abdominal thrusts are used for a conscious adult with a severe airway obstruction.", "subcategory": "Patient Interactions and Management" }, { "q": "An automated external defibrillator (AED) announces it is analyzing the rhythm and advises a shock. Before pressing the shock button, the rescuer must:", "options": [ "Give two rescue breaths first", "Check the pulse for one full minute", "Remove the pads to check placement", "Make sure no one is touching the patient" ], "answer_index": 3, "explanation": "Everyone must be clear of the patient so the shock is not transmitted to rescuers.", "subcategory": "Patient Interactions and Management" }, { "q": "A patient receiving IV contrast develops a few scattered hives with no breathing difficulty or other symptoms. This reaction is best classified as:", "options": [ "Mild; observe the patient and notify the radiologist", "Not a reaction; discharge the patient now", "Moderate; give epinephrine right away", "Severe; start CPR and call a code" ], "answer_index": 0, "explanation": "Limited urticaria alone is a mild allergic-like reaction that is monitored, with the radiologist deciding on any treatment.", "subcategory": "Patient Interactions and Management" }, { "q": "A patient with a prior allergic-like reaction to iodinated contrast needs a contrast study. A typical premedication regimen includes:", "options": [ "Epinephrine plus a diuretic", "Atropine plus aspirin", "Insulin plus a beta blocker", "A corticosteroid plus an antihistamine" ], "answer_index": 3, "explanation": "ACR regimens commonly use oral prednisone or methylprednisolone with diphenhydramine before the injection.", "subcategory": "Patient Interactions and Management" }, { "q": "Which route of drug administration is parenteral?", "options": [ "Rectal", "Oral", "Sublingual", "Intravenous" ], "answer_index": 3, "explanation": "Parenteral routes bypass the digestive tract, such as IV, IM and subcutaneous injections.", "subcategory": "Patient Interactions and Management" }, { "q": "Which needle has the largest lumen (inside diameter)?", "options": [ "22 gauge", "18 gauge", "20 gauge", "25 gauge" ], "answer_index": 1, "explanation": "Needle gauge is inverse to diameter: the smaller the gauge number, the larger the lumen.", "subcategory": "Patient Interactions and Management" }, { "q": "Which item is NOT one of the 'rights' of medication administration?", "options": [ "Right patient", "Right dose", "Right diagnosis", "Right route" ], "answer_index": 2, "explanation": "The rights include patient, drug, dose, route, time and documentation; diagnosis is not one of them.", "subcategory": "Patient Interactions and Management" }, { "q": "After a venipuncture, what should the radiographer do with the used needle?", "options": [ "Leave it on the tray for housekeeping", "Recap it with both hands before disposal", "Place it uncapped in a puncture-resistant sharps container", "Bend it and place it in the regular trash" ], "answer_index": 2, "explanation": "Needles are never recapped by hand; they go directly into a sharps container to prevent needlesticks.", "subcategory": "Patient Interactions and Management" }, { "q": "When removing personal protective equipment after an isolation exam, which item is usually removed FIRST?", "options": [ "Mask or respirator", "Surgical cap or hair cover", "Goggles or face shield", "Gloves" ], "answer_index": 3, "explanation": "Gloves are the most contaminated item and are removed first; the mask or respirator is removed last.", "subcategory": "Patient Interactions and Management" }, { "q": "A patient on chemotherapy has a very low white blood cell count. Which precautions protect this patient during imaging?", "options": [ "Protective (reverse) isolation", "No precautions are needed", "Contact precautions only", "Airborne precautions only" ], "answer_index": 0, "explanation": "Protective isolation shields an immunocompromised patient from pathogens carried by staff and equipment.", "subcategory": "Patient Interactions and Management" }, { "q": "A contaminated X-ray table that carries microorganisms from one patient to the next is an example of a:", "options": [ "Reservoir host", "Portal of entry", "Fomite", "Vector" ], "answer_index": 2, "explanation": "A fomite is an inanimate object that transmits infection; a vector is a living carrier such as an insect.", "subcategory": "Patient Interactions and Management" }, { "q": "A small fire starts in a wastebasket in the exam room while a patient is on the table. Using the RACE plan, the radiographer's FIRST step is to:", "options": [ "Close the door and leave the room", "Remove the patient from immediate danger", "Fight the fire with an extinguisher", "Activate the alarm before moving anyone" ], "answer_index": 1, "explanation": "RACE stands for Rescue, Alarm, Contain, Extinguish, and rescuing those in danger comes first.", "subcategory": "Patient Interactions and Management" }, { "q": "An older patient with hearing loss is having trouble following positioning instructions. The radiographer should:", "options": [ "Face the patient and speak clearly in a lower pitch", "Speak faster so the exam ends sooner", "Skip explanations and position the patient silently", "Shout instructions from behind the patient" ], "answer_index": 0, "explanation": "Facing the patient allows lip reading, and lower-pitched clear speech is easier to hear with age-related hearing loss.", "subcategory": "Patient Interactions and Management" } ] }, { "id": "safety", "name": "Safety", "main_points": [ "X-rays are produced when electrons boiled off the filament (thermionic emission) are accelerated by the kVp and stopped at the anode; over 99% of their energy becomes heat.", "Bremsstrahlung produces most of the diagnostic beam as a continuous spectrum; tungsten K-characteristic X-rays are only produced when the kVp exceeds about 70 (K-shell binding energy 69.5 keV).", "kVp controls beam quality (penetrating ability) and also raises quantity; mAs controls quantity only and is directly proportional to the number of photons produced.", "Inverse square law: beam intensity is inversely proportional to the square of the distance, so doubling the distance cuts exposure to one quarter.", "Photoelectric absorption (probability rises with atomic number cubed, falls with energy) creates image contrast and most patient dose; Compton scatter is the main source of occupational exposure and image fog.", "SI units: absorbed dose and air kerma in gray (Gy), equivalent and effective dose in sievert (Sv), exposure in coulombs per kilogram (C/kg); 1 Gy = 100 rad and 1 Sv = 100 rem.", "Law of Bergonie and Tribondeau: cells are most radiosensitive when young, undifferentiated and rapidly dividing; lymphocytes and stem cells are very sensitive, while nerve and muscle cells are least sensitive.", "Deterministic effects (tissue reactions such as skin erythema and cataracts) have a threshold and severity rises with dose; stochastic effects (cancer, genetic effects) have no threshold and their probability rises with dose.", "Acute radiation syndromes appear in order of rising whole-body dose: hematopoietic (roughly 2-10 Gy), gastrointestinal (roughly 10-50 Gy) and central nervous system (above about 50 Gy).", "Patient dose is cut by tight collimation, proper filtration (at least 2.5 mm aluminum equivalent total for units operating above 70 kVp), optimal kVp/mAs technique, clear instructions and avoiding repeats.", "Fluoroscopy safeguards: source-to-skin distance at least 38 cm for fixed and 30 cm for mobile units, a 5-minute cumulative timer, pulsed fluoro and last-image hold, and normal-mode output limited to 88 mGy/min (176 mGy/min with high-level control).", "Personnel use time, distance and shielding (ALARA); NCRP #116 sets an occupational effective dose limit of 50 mSv per year (cumulative 10 mSv x age), 1 mSv per year for frequent public exposure, and 0.5 mSv per month to the embryo/fetus once pregnancy is declared." ], "vocabulary": [ { "term": "Thermionic emission", "definition": "Release of electrons from the heated tungsten filament of the cathode." }, { "term": "Bremsstrahlung radiation", "definition": "'Braking' radiation produced when a projectile electron slows near a target nucleus, forming a continuous energy spectrum." }, { "term": "Characteristic radiation", "definition": "X-rays produced when an inner-shell electron is ejected and an outer-shell electron fills the vacancy." }, { "term": "Photoelectric absorption", "definition": "Interaction in which an X-ray photon is completely absorbed by ejecting an inner-shell electron." }, { "term": "Compton scatter", "definition": "Interaction in which a photon ejects an outer-shell electron and continues in a new direction with less energy." }, { "term": "Coherent scatter", "definition": "Low-energy interaction in which a photon changes direction without ionizing the atom." }, { "term": "Half-value layer (HVL)", "definition": "Thickness of material that reduces beam intensity to half its original value; a measure of beam quality." }, { "term": "Air kerma", "definition": "Kinetic energy released per unit mass of air by the X-ray beam, measured in gray (Gy)." }, { "term": "Effective dose", "definition": "Dose that accounts for radiation type and the sensitivity of the tissues exposed, expressed in sieverts (Sv)." }, { "term": "Linear energy transfer (LET)", "definition": "The rate at which radiation deposits energy along its path through tissue." }, { "term": "Relative biological effectiveness (RBE)", "definition": "Ratio comparing the biologic damage of a test radiation to a reference radiation at equal dose." }, { "term": "Oxygen enhancement ratio (OER)", "definition": "Measure of how much more sensitive well-oxygenated tissue is to radiation than hypoxic tissue." }, { "term": "LD50/30", "definition": "The whole-body dose expected to kill 50% of an exposed population within 30 days." }, { "term": "Deterministic effect", "definition": "Radiation effect with a dose threshold whose severity increases with dose, also called a tissue reaction." }, { "term": "Stochastic effect", "definition": "Radiation effect with no threshold whose probability, not severity, increases with dose." }, { "term": "ALARA", "definition": "'As low as reasonably achievable,' the guiding principle for limiting occupational radiation exposure." }, { "term": "Dose area product (DAP)", "definition": "Product of air kerma and beam area, used to estimate total radiation delivered to the patient." }, { "term": "OSL dosimeter", "definition": "Personnel monitor using aluminum oxide that releases light in proportion to dose when stimulated by a laser." } ], "quiz": [ { "q": "If a radiographer doubles their distance from a radiation source, their exposure rate becomes:", "options": [ "one half of the original", "twice the original", "one quarter of the original", "four times the original" ], "answer_index": 2, "explanation": "By the inverse square law, intensity changes with 1/d squared: doubling the distance gives (1/2) squared, or 1/4." }, { "q": "Which interaction is the main source of scatter that exposes personnel during fluoroscopy?", "options": [ "Compton scatter", "Coherent scatter", "Photoelectric absorption", "Pair production" ], "answer_index": 0, "explanation": "Compton scatter dominates in the diagnostic range and sends lower-energy photons in many directions, including toward staff." }, { "q": "Photoelectric absorption is MOST likely to occur with:", "options": [ "high-energy photons in fat", "any photon in water, regardless of energy", "high-energy photons in air", "low-energy photons in high atomic number tissue such as bone" ], "answer_index": 3, "explanation": "Photoelectric probability rises roughly with Z cubed and falls with photon energy cubed, so low-energy photons in bone favor it." }, { "q": "Most of the X-ray photons in a typical 80 kVp diagnostic beam come from:", "options": [ "characteristic interactions", "bremsstrahlung interactions", "Compton interactions in the target", "coherent interactions" ], "answer_index": 1, "explanation": "Bremsstrahlung interactions make up the large majority of the diagnostic beam; characteristic photons are a small share." }, { "q": "Which SI unit expresses effective dose?", "options": [ "Gray (Gy)", "Coulomb per kilogram (C/kg)", "Becquerel (Bq)", "Sievert (Sv)" ], "answer_index": 3, "explanation": "Effective dose and equivalent dose are given in sieverts; the gray measures absorbed dose and air kerma." }, { "q": "According to the law of Bergonie and Tribondeau, which cells are MOST radiosensitive?", "options": [ "Lymphocytes", "Mature nerve cells", "Muscle cells", "Mature red blood cells" ], "answer_index": 0, "explanation": "Lymphocytes are among the most radiosensitive cells in the body; mature nerve and muscle cells are among the least." }, { "q": "Radiation-induced cancer is classified as which type of effect?", "options": [ "Threshold", "Deterministic", "Stochastic", "Acute" ], "answer_index": 2, "explanation": "Cancer has no known threshold and its probability rises with dose, which defines a stochastic effect." }, { "q": "What is the minimum source-to-skin distance for a fixed (stationary) fluoroscopic unit?", "options": [ "15 cm", "30 cm", "38 cm", "72 cm" ], "answer_index": 2, "explanation": "Federal rules (21 CFR) require at least 38 cm for fixed fluoroscopes; 30 cm is the minimum for mobile units." }, { "q": "The cumulative timer on a fluoroscopic unit alerts the operator after how much beam-on time?", "options": [ "1 minute", "5 minutes", "10 minutes", "15 minutes" ], "answer_index": 1, "explanation": "The cumulative timer sounds after 5 minutes of fluoroscopy time to make the operator aware of total beam-on time." }, { "q": "Under NCRP #116, what is the annual occupational effective dose limit for a radiographer?", "options": [ "1 mSv", "5 mSv", "20 mSv", "50 mSv" ], "answer_index": 3, "explanation": "NCRP #116 sets 50 mSv per year as the occupational effective dose limit, with a cumulative limit of 10 mSv times age." }, { "q": "Which change reduces patient skin dose while hardening the X-ray beam?", "options": [ "Increasing mAs", "Decreasing the source-to-image distance", "Opening the collimator", "Adding aluminum filtration" ], "answer_index": 3, "explanation": "Filtration removes low-energy photons that would only be absorbed in the skin, raising average beam energy and lowering skin dose." }, { "q": "Once a radiographer declares pregnancy, the monthly equivalent dose limit to the embryo/fetus is:", "options": [ "0.05 mSv", "0.5 mSv", "5 mSv", "50 mSv" ], "answer_index": 1, "explanation": "NCRP #116 limits embryo/fetus exposure to 0.5 mSv per month after the pregnancy is declared." } ], "bank": [ { "q": "Characteristic X-rays are produced when:", "options": [ "Electrons are boiled off the heated filament", "A projectile electron slows near the nucleus of a target atom", "A photon is absorbed and an electron pair is created", "An outer-shell electron fills a vacancy in an inner shell of a target atom" ], "answer_index": 3, "explanation": "The energy difference between the shells is emitted as a characteristic photon; slowing near the nucleus produces bremsstrahlung.", "subcategory": "Radiation Physics and Radiobiology" }, { "q": "According to the line-focus principle, decreasing the anode target angle will:", "options": [ "Decrease the effective focal spot size", "Reduce the anode heel effect", "Increase the actual focal spot size", "Increase the effective focal spot size" ], "answer_index": 0, "explanation": "A steeper (smaller) target angle projects a smaller effective focal spot, at the cost of a stronger heel effect and smaller field coverage.", "subcategory": "Radiation Physics and Radiobiology" }, { "q": "A beam has an intensity of 80 mGy before filtration. After passing through material equal to 2 half-value layers, its intensity is:", "options": [ "10 mGy", "40 mGy", "60 mGy", "20 mGy" ], "answer_index": 3, "explanation": "Each HVL halves the intensity: 80 to 40 to 20 mGy.", "subcategory": "Radiation Physics and Radiobiology" }, { "q": "The cloud of electrons that forms around a heated filament before an exposure is called the:", "options": [ "Line focus", "Space charge", "Focal track", "Anode heel" ], "answer_index": 1, "explanation": "Thermionic emission frees electrons that gather near the filament as the space charge, which limits further emission.", "subcategory": "Radiation Physics and Radiobiology" }, { "q": "How many heat units are produced by a single exposure of 80 kVp, 200 mA and 0.5 s on a high-frequency generator?", "options": [ "10,800 HU", "11,200 HU", "8,000 HU", "16,000 HU" ], "answer_index": 1, "explanation": "HU = kVp x mA x s x 1.4 for high-frequency units: 80 x 200 x 0.5 x 1.4 = 11,200 HU.", "subcategory": "Radiation Physics and Radiobiology" }, { "q": "Which photon interaction involves no ionization and only changes the photon's direction?", "options": [ "Coherent (classical) scatter", "Pair production", "Compton scatter", "Photoelectric absorption" ], "answer_index": 0, "explanation": "In coherent scatter a low-energy photon is re-emitted at the same energy in a new direction without ionizing the atom.", "subcategory": "Radiation Physics and Radiobiology" }, { "q": "Pair production does not occur in diagnostic radiography because it requires a photon energy of at least:", "options": [ "1.02 MeV", "69.5 keV", "511 eV", "150 keV" ], "answer_index": 0, "explanation": "Pair production needs at least 1.02 MeV to create an electron-positron pair, far above diagnostic beam energies.", "subcategory": "Radiation Physics and Radiobiology" }, { "q": "Which type of radiation has the highest linear energy transfer (LET)?", "options": [ "Alpha particles", "Diagnostic X-rays", "Gamma rays", "Beta particles" ], "answer_index": 0, "explanation": "Heavy, charged alpha particles deposit energy densely along a short path, giving high LET and high biologic effectiveness.", "subcategory": "Radiation Physics and Radiobiology" }, { "q": "Most biological damage from diagnostic X-rays occurs through:", "options": [ "Direct ionization of DNA in most cases", "Heating of tissue by the beam", "Indirect action from free radicals formed by radiolysis of water", "Nuclear activation of body tissues" ], "answer_index": 2, "explanation": "Because the body is mostly water, low-LET radiation mainly creates free radicals that then damage DNA and other molecules.", "subcategory": "Radiation Physics and Radiobiology" }, { "q": "In which phase of the cell cycle is a cell MOST radiosensitive?", "options": [ "Mitosis (M phase)", "Late S phase", "G0 (resting) phase", "Early G1 phase" ], "answer_index": 0, "explanation": "Cells are most sensitive during mitosis and least sensitive in late S phase, when DNA repair is most active.", "subcategory": "Radiation Physics and Radiobiology" }, { "q": "Which acute radiation syndrome appears at the lowest whole-body dose?", "options": [ "Central nervous system syndrome", "Hematopoietic syndrome", "Gastrointestinal syndrome", "Cerebrovascular syndrome" ], "answer_index": 1, "explanation": "Bone marrow depression begins at roughly 1 Gy whole-body, well below the doses that cause GI or CNS syndromes.", "subcategory": "Radiation Physics and Radiobiology" }, { "q": "Significant radiation exposure during the first two weeks after conception (preimplantation) most likely results in:", "options": [ "Either no effect or loss of the embryo (all-or-none)", "Microcephaly and intellectual disability", "Major organ malformations", "Childhood leukemia only" ], "answer_index": 0, "explanation": "Before implantation the response is all-or-none; malformation risk is highest during organogenesis that follows.", "subcategory": "Radiation Physics and Radiobiology" }, { "q": "Which is an example of a deterministic (tissue) effect?", "options": [ "Radiation-induced leukemia", "Breast cancer years after exposure", "Skin erythema after a very long fluoroscopic procedure", "Genetic mutations in future generations" ], "answer_index": 2, "explanation": "Deterministic effects have a dose threshold and their severity rises with dose; cancers and genetic effects are stochastic.", "subcategory": "Radiation Physics and Radiobiology" }, { "q": "Which dose-response model is used for radiation protection when estimating stochastic risks such as cancer?", "options": [ "Sigmoid, threshold", "Nonlinear, threshold", "Linear, threshold", "Linear, nonthreshold" ], "answer_index": 3, "explanation": "The linear nonthreshold model assumes any dose carries some risk proportional to dose, which underpins ALARA.", "subcategory": "Radiation Physics and Radiobiology" }, { "q": "Primary protective barriers in a general radiographic room typically contain:", "options": [ "1/32 inch (0.8 mm) lead, extending to the ceiling", "1/16 inch (1.6 mm) lead, extending 7 ft (2.1 m) up from the floor", "0.5 mm lead, covering the whole wall", "0.25 mm lead, extending 5 ft up from the floor" ], "answer_index": 1, "explanation": "Walls the primary beam can strike need 1/16 in lead to 7 ft; secondary barriers need 1/32 in lead and extend to the ceiling.", "subcategory": "Radiation Protection" }, { "q": "During fluoroscopy, a radiographer wearing a single personal dosimeter and a lead apron should wear the dosimeter:", "options": [ "At the waist, under the apron", "At the collar, under the thyroid shield", "At the collar, outside the apron", "On the wrist" ], "answer_index": 2, "explanation": "Worn at collar level outside the apron, the dosimeter estimates dose to the unshielded head, neck and lens of the eye.", "subcategory": "Radiation Protection" }, { "q": "An optically stimulated luminescence (OSL) dosimeter uses which detector material?", "options": [ "Air-filled ionization chamber", "Lithium fluoride", "Aluminum oxide", "Silver bromide film" ], "answer_index": 2, "explanation": "OSL dosimeters contain aluminum oxide that releases light in proportion to dose when stimulated by a laser; TLDs use lithium fluoride.", "subcategory": "Radiation Protection" }, { "q": "Which survey instrument is best suited to detect small amounts of radioactive contamination?", "options": [ "Geiger-Muller counter", "Pocket ionization chamber", "OSL dosimeter", "Ionization chamber survey meter" ], "answer_index": 0, "explanation": "The GM counter is very sensitive to low levels of radiation, making it ideal for finding contamination; ionization chambers measure higher exposure rates.", "subcategory": "Radiation Protection" }, { "q": "During a mobile chest exposure, the radiographer should stand:", "options": [ "At least 6 ft (2 m) from the patient and tube, at a right angle to the beam, wearing an apron", "In line with the primary beam behind the receptor", "Next to the patient to steady them", "Directly behind the tube head" ], "answer_index": 0, "explanation": "Distance and position at 90 degrees to the scattering patient give the lowest exposure; an apron adds shielding.", "subcategory": "Radiation Protection" }, { "q": "A toddler cannot hold still for a radiograph and immobilization devices are not enough. Who should hold the child?", "options": [ "The radiographer performing the exam", "A parent or guardian who is not pregnant, wearing a lead apron and gloves", "A pregnant mother wearing two aprons", "A radiography student" ], "answer_index": 1, "explanation": "Occupational workers should never routinely hold patients; a nonpregnant family member in protective apparel is preferred.", "subcategory": "Radiation Protection" }, { "q": "Under NCRP #116, what is the annual effective dose limit for members of the public with continuous or frequent exposure?", "options": [ "0.5 mSv", "50 mSv", "1 mSv", "5 mSv" ], "answer_index": 2, "explanation": "The public limit is 1 mSv per year for continuous or frequent exposure (5 mSv for infrequent exposure).", "subcategory": "Radiation Protection" }, { "q": "Under NCRP #116, a 17-year-old radiography student has an annual effective dose limit of:", "options": [ "5 mSv", "20 mSv", "50 mSv", "1 mSv" ], "answer_index": 3, "explanation": "Students and trainees under 18 are limited to 1 mSv per year, the same as frequently exposed members of the public.", "subcategory": "Radiation Protection" }, { "q": "What is the annual occupational equivalent dose limit for the skin and the hands and feet?", "options": [ "150 mSv", "50 mSv", "1,000 mSv", "500 mSv" ], "answer_index": 3, "explanation": "NCRP #116 sets 500 mSv per year for skin and extremities, ten times the whole-body effective dose limit.", "subcategory": "Radiation Protection" }, { "q": "Using the NCRP cumulative guideline, what is the cumulative effective dose limit for a 35-year-old radiographer?", "options": [ "1,750 mSv", "50 mSv", "350 mSv", "175 mSv" ], "answer_index": 2, "explanation": "The cumulative limit is 10 mSv multiplied by age in years: 10 x 35 = 350 mSv.", "subcategory": "Radiation Protection" }, { "q": "During C-arm fluoroscopy with a horizontal (cross-table) beam, where should the radiographer stand to receive the least scatter?", "options": [ "On the image receptor side, opposite the X-ray tube", "Directly in line with the beam", "On the X-ray tube side, near the patient", "Beside the tube with the apron removed for comfort" ], "answer_index": 0, "explanation": "Scatter is greatest on the entrance (tube) side of the patient, so standing by the receptor side lowers exposure.", "subcategory": "Radiation Protection" }, { "q": "Which fluoroscopic feature reduces patient dose?", "options": [ "Last-image hold", "Electronic magnification mode", "Increasing the distance between the patient and the image receptor", "Continuous instead of pulsed fluoroscopy" ], "answer_index": 0, "explanation": "Last-image hold lets the operator study the image without more beam-on time; magnification, continuous mode and a large receptor gap all raise dose.", "subcategory": "Radiation Protection" }, { "q": "Positive beam limitation (PBL) automatically:", "options": [ "Ends the exposure once enough radiation reaches the receptor", "Limits the length of fluoroscopy time", "Collimates the beam to the size of the image receptor in the Bucky", "Adds aluminum filtration to the beam" ], "answer_index": 2, "explanation": "PBL senses receptor size in the Bucky tray and keeps the field no larger than the receptor, though the radiographer should collimate further to the part.", "subcategory": "Radiation Protection" }, { "q": "The protective curtain hanging from a fluoroscopic tower should have a lead equivalent of at least:", "options": [ "0.05 mm Pb", "1.6 mm Pb", "1.0 mm Pb", "0.25 mm Pb" ], "answer_index": 3, "explanation": "Protective drapes and the Bucky slot cover must provide at least 0.25 mm lead equivalent to block scatter from the patient.", "subcategory": "Radiation Protection" }, { "q": "With high-level control activated, the maximum tabletop air kerma rate for fluoroscopy is:", "options": [ "176 mGy/min (20 R/min)", "44 mGy/min (5 R/min)", "500 mGy/min (57 R/min)", "88 mGy/min (10 R/min)" ], "answer_index": 0, "explanation": "Federal rules limit normal fluoroscopy to 88 mGy/min and high-level control to 176 mGy/min.", "subcategory": "Radiation Protection" }, { "q": "What is the minimum source-to-skin distance for mobile radiographic units?", "options": [ "30 cm (12 in)", "100 cm (40 in)", "38 cm (15 in)", "15 cm (6 in)" ], "answer_index": 0, "explanation": "Mobile units must keep at least 30 cm between the source and the skin to limit entrance skin dose.", "subcategory": "Radiation Protection" }, { "q": "Leakage radiation from the X-ray tube housing must not exceed what level at 1 m from the source?", "options": [ "About 10 mGy (1 R) per hour", "About 0.1 mGy (10 mR) per day", "About 1 mGy (100 mR) per hour", "About 1 mGy (100 mR) per minute" ], "answer_index": 2, "explanation": "The tube housing must hold leakage to about 100 mR (0.88-1 mGy) per hour at 1 m when operated at maximum continuous rating.", "subcategory": "Radiation Protection" }, { "q": "Which technique change typically lowers patient dose while keeping receptor exposure adequate?", "options": [ "Use the large focal spot", "Decrease kVp by 15% and double the mAs", "Increase kVp by 15% and halve the mAs", "Shorten the SID" ], "answer_index": 2, "explanation": "Higher kVp is more penetrating, so the mAs can be halved, reducing the radiation absorbed by the patient.", "subcategory": "Radiation Protection" }, { "q": "Before a pelvic radiograph on a female patient of childbearing age, the radiographer should:", "options": [ "Always order a pregnancy test", "Schedule the exam within 10 days after menses", "Apply a lead shield and skip the screening question", "Ask about and document the possibility of pregnancy according to department policy" ], "answer_index": 3, "explanation": "Pregnancy screening is required before exposing the pelvis of a patient who could be pregnant; follow the department's policy for unsure answers.", "subcategory": "Radiation Protection" }, { "q": "An X-ray tube is operated at 90 kVp. What is the maximum energy of any photon in the beam?", "options": [ "30 keV", "45 keV", "180 keV", "90 keV" ], "answer_index": 3, "explanation": "The peak kilovoltage sets the maximum photon energy, so 90 kVp gives photons up to 90 keV.", "subcategory": "Radiation Physics and Radiobiology" }, { "q": "When projectile electrons strike the anode target, approximately what percentage of their kinetic energy becomes heat?", "options": [ "More than 99%", "About 50%", "About 75%", "Less than 1%" ], "answer_index": 0, "explanation": "X-ray production is very inefficient: over 99% of the energy becomes heat and under 1% becomes X-rays.", "subcategory": "Radiation Physics and Radiobiology" }, { "q": "The release of electrons from a heated tungsten filament is called:", "options": [ "Photoelectric emission", "Rectification", "Thermionic emission", "Electron capture" ], "answer_index": 2, "explanation": "Heating the filament gives electrons enough energy to boil off its surface, which is thermionic emission.", "subcategory": "Radiation Physics and Radiobiology" }, { "q": "Ionization is best defined as:", "options": [ "The splitting of a nucleus into two parts", "The removal of an orbital electron from an atom", "The conversion of heat into light", "The addition of a neutron to a nucleus" ], "answer_index": 1, "explanation": "Ionization removes an electron, leaving a positively charged ion and a free electron.", "subcategory": "Radiation Physics and Radiobiology" }, { "q": "In which interaction is the incident X-ray photon completely absorbed?", "options": [ "Coherent scattering", "Thomson scattering", "Photoelectric absorption", "Compton scattering" ], "answer_index": 2, "explanation": "In photoelectric absorption the photon gives all its energy to an inner-shell electron and disappears.", "subcategory": "Radiation Physics and Radiobiology" }, { "q": "In a Compton interaction, the outer-shell electron ejected from the atom is called the:", "options": [ "Photoelectron", "Recoil electron", "Auger electron", "Projectile electron" ], "answer_index": 1, "explanation": "The Compton (recoil) electron is ejected while the scattered photon continues with reduced energy.", "subcategory": "Radiation Physics and Radiobiology" }, { "q": "The probability of photoelectric absorption varies approximately with the atomic number (Z) of the absorber:", "options": [ "Directly (Z)", "Cubed (Z^3)", "Inversely (1/Z)", "It does not depend on Z" ], "answer_index": 1, "explanation": "Photoelectric probability rises roughly with Z cubed, which is why bone and contrast agents absorb strongly.", "subcategory": "Radiation Physics and Radiobiology" }, { "q": "As the energy of an X-ray photon increases, its wavelength:", "options": [ "Decreases", "Doubles", "Increases", "Stays the same" ], "answer_index": 0, "explanation": "Photon energy and wavelength are inversely related; higher-energy photons have shorter wavelengths.", "subcategory": "Radiation Physics and Radiobiology" }, { "q": "X-rays and gamma rays differ mainly in their:", "options": [ "Speed in a vacuum", "Ability to ionize", "Origin", "Electrical charge" ], "answer_index": 2, "explanation": "Both are electromagnetic photons; X-rays arise from electron interactions and gamma rays from the nucleus.", "subcategory": "Radiation Physics and Radiobiology" }, { "q": "A tissue receives an absorbed dose of 0.5 mGy from alpha particles (radiation weighting factor 20). What is the equivalent dose?", "options": [ "10 mSv", "2.5 mSv", "0.5 mSv", "20 mSv" ], "answer_index": 0, "explanation": "Equivalent dose equals absorbed dose times the radiation weighting factor: 0.5 x 20 = 10 mSv.", "subcategory": "Radiation Physics and Radiobiology" }, { "q": "Tissue weighting factors are applied to equivalent doses in order to calculate:", "options": [ "Absorbed dose", "Exposure in air", "Air kerma", "Effective dose" ], "answer_index": 3, "explanation": "Effective dose sums each organ's equivalent dose times its tissue weighting factor to reflect overall stochastic risk.", "subcategory": "Radiation Physics and Radiobiology" }, { "q": "Irradiation of water in the body produces highly reactive molecules with an unpaired electron, called:", "options": [ "Positrons", "Free radicals", "Isotopes", "Neutrinos" ], "answer_index": 1, "explanation": "Radiolysis of water creates free radicals, which can then damage DNA indirectly.", "subcategory": "Radiation Physics and Radiobiology" }, { "q": "Well-oxygenated tissue is more sensitive to radiation than poorly oxygenated tissue. This is described by the:", "options": [ "Oxygen enhancement ratio", "Law of Bergonie and Tribondeau", "Relative biologic effectiveness", "Linear energy transfer" ], "answer_index": 0, "explanation": "The oxygen enhancement ratio compares the dose needed for an effect without oxygen to the dose needed with oxygen.", "subcategory": "Radiation Physics and Radiobiology" }, { "q": "Relative biologic effectiveness (RBE) compares:", "options": [ "The number of cells killed in one cell cycle phase to another", "The energy deposited per unit length of track in tissue", "The dose of 250 kV X-rays to the dose of a test radiation giving the same effect", "The dose under low-oxygen conditions to the dose under high oxygen" ], "answer_index": 2, "explanation": "RBE is the ratio of the 250 kV X-ray dose to the test radiation dose needed to produce the same biologic effect.", "subcategory": "Radiation Physics and Radiobiology" }, { "q": "Which blood cell is the most radiosensitive?", "options": [ "Erythrocyte", "Neutrophil", "Platelet", "Lymphocyte" ], "answer_index": 3, "explanation": "Lymphocytes are the most radiosensitive blood cells, and their count drops first after significant exposure.", "subcategory": "Radiation Physics and Radiobiology" }, { "q": "Which cells in an adult are among the LEAST radiosensitive?", "options": [ "Spermatogonia", "Intestinal crypt cells", "Basal skin cells", "Nerve cells" ], "answer_index": 3, "explanation": "Mature nerve cells are highly specialized and rarely divide, so they are relatively radioresistant.", "subcategory": "Radiation Physics and Radiobiology" }, { "q": "Transient skin erythema after a long fluoroscopic procedure typically appears once the skin dose reaches about:", "options": [ "0.02 Gy", "2 Gy", "0.2 Gy", "20 mGy" ], "answer_index": 1, "explanation": "Transient erythema is a deterministic effect with a threshold of roughly 2 Gy to the skin.", "subcategory": "Radiation Physics and Radiobiology" }, { "q": "The whole-body dose expected to kill 50% of exposed adults within 30 days without medical treatment (LD50/30) is about:", "options": [ "50-60 Gy", "0.25-0.5 Gy", "3-4 Gy", "10-12 Gy" ], "answer_index": 2, "explanation": "The human LD50/30 is generally cited at about 3-4 Gy (around 3.5 Gy) without treatment.", "subcategory": "Radiation Physics and Radiobiology" }, { "q": "Which radiation-induced cancer has the shortest latent period?", "options": [ "Leukemia", "Lung cancer", "Thyroid cancer", "Breast cancer" ], "answer_index": 0, "explanation": "Leukemia can appear within a few years of exposure, while solid tumors usually take 10 years or more.", "subcategory": "Radiation Physics and Radiobiology" }, { "q": "Significant radiation exposure during organogenesis (about weeks 2-8 of gestation) is most likely to cause:", "options": [ "Hereditary effects in grandchildren only", "Spontaneous abortion only", "No effect on the embryo", "Congenital anomalies" ], "answer_index": 3, "explanation": "Organs form during weeks 2-8, so this is the period of greatest risk for birth defects.", "subcategory": "Radiation Physics and Radiobiology" }, { "q": "Compared with one large dose given all at once, the same total dose delivered in several smaller fractions generally produces:", "options": [ "Less biologic damage", "More biologic damage", "Only deterministic effects", "Identical biologic damage" ], "answer_index": 0, "explanation": "Fractionation allows cells time to repair sublethal damage between doses, reducing the overall effect.", "subcategory": "Radiation Physics and Radiobiology" }, { "q": "The ALARA concept means that radiation exposure should be kept:", "options": [ "As low as reasonably achievable", "Below 10% of background levels", "At the annual dose limit", "As low as the equipment allows" ], "answer_index": 0, "explanation": "ALARA requires keeping doses as low as reasonably achievable, not merely under the legal limits.", "subcategory": "Radiation Protection" }, { "q": "A radiographer cuts their time in a fluoroscopy room in half while all other factors stay the same. Their exposure will:", "options": [ "Stay the same", "Double", "Be reduced by half", "Be reduced to one-fourth" ], "answer_index": 2, "explanation": "Exposure is directly proportional to time, so halving the time halves the dose.", "subcategory": "Radiation Protection" }, { "q": "The exposure rate is 9 mGy/h at 1 m from a source. What is the rate at 3 m?", "options": [ "3 mGy/h", "0.5 mGy/h", "4.5 mGy/h", "1 mGy/h" ], "answer_index": 3, "explanation": "By the inverse square law, tripling the distance reduces intensity to 1/9: 9 / 9 = 1 mGy/h.", "subcategory": "Radiation Protection" }, { "q": "Secondary radiation that personnel must be shielded from consists of:", "options": [ "Leakage and primary radiation", "Remnant and useful beam radiation", "Primary and remnant radiation", "Scatter and leakage radiation" ], "answer_index": 3, "explanation": "Secondary barriers protect against scatter from the patient and leakage from the tube housing.", "subcategory": "Radiation Protection" }, { "q": "Secondary protective barriers, such as the control booth wall, typically require at least:", "options": [ "1/32 inch of lead equivalent", "1/16 inch of lead equivalent", "1/4 inch of lead equivalent", "1 inch of lead equivalent" ], "answer_index": 0, "explanation": "Secondary barriers usually need 1/32 inch Pb equivalent; primary barriers need 1/16 inch.", "subcategory": "Radiation Protection" }, { "q": "In shielding design, the 'use factor' describes:", "options": [ "The lead thickness required for a barrier", "The total mA-minutes the unit produces each week", "The fraction of time an area is occupied by people", "The fraction of beam-on time the primary beam is aimed at a barrier" ], "answer_index": 3, "explanation": "Use factor is the portion of the workload directed at a specific barrier; occupancy factor relates to people in the area.", "subcategory": "Radiation Protection" }, { "q": "Which action reduces both patient dose and the scatter produced during a radiographic exam?", "options": [ "Using a longer exposure time with lower mA", "Increasing mAs to improve image quality", "Collimating to the smallest field that covers the anatomy", "Opening the collimator to include extra anatomy" ], "answer_index": 2, "explanation": "Tight collimation irradiates less tissue, lowering patient dose and the amount of scatter produced.", "subcategory": "Radiation Protection" }, { "q": "Protective lead aprons should be checked for cracks or holes by:", "options": [ "Inspecting only when visible tears appear", "Fluoroscopic or radiographic inspection at least annually", "Folding them and checking for creases monthly", "Weighing them on a scale each week" ], "answer_index": 1, "explanation": "Aprons are imaged at least yearly to find hidden cracks; they should be hung, not folded.", "subcategory": "Radiation Protection" }, { "q": "What is an advantage of an OSL dosimeter over a TLD?", "options": [ "It never needs to be sent away for processing", "It responds only to scattered radiation", "It can be reread to confirm a dose reading", "It shows the dose instantly on a display" ], "answer_index": 2, "explanation": "OSL dosimeters can be reanalyzed, while reading a TLD releases its stored energy so it cannot be reread.", "subcategory": "Radiation Protection" }, { "q": "Which personnel monitoring device gives an immediate reading of exposure?", "options": [ "Thermoluminescent dosimeter", "Pocket ionization chamber", "Optically stimulated luminescence dosimeter", "Film badge" ], "answer_index": 1, "explanation": "A pocket ionization chamber can be read on the spot; TLD, OSL and film need processing.", "subcategory": "Radiation Protection" }, { "q": "A pregnant radiographer is issued a second dosimeter to monitor the embryo-fetus. Where should it be worn?", "options": [ "Clipped to the back of the apron", "At waist level under the lead apron", "At collar level outside the apron", "On the wrist of the dominant hand" ], "answer_index": 1, "explanation": "The fetal dosimeter is worn at abdomen (waist) level beneath the apron to estimate fetal dose.", "subcategory": "Radiation Protection" }, { "q": "After pregnancy is declared, what is the recommended equivalent dose limit to the embryo-fetus for the entire gestation?", "options": [ "5 mSv", "1 mSv", "0.5 mSv", "50 mSv" ], "answer_index": 0, "explanation": "NCRP recommends 5 mSv for the whole gestation, in addition to a 0.5 mSv monthly limit.", "subcategory": "Radiation Protection" }, { "q": "During fluoroscopy, the Bucky slot cover must provide at least:", "options": [ "2.5 mm aluminum equivalent", "0.25 mm lead equivalent", "1.0 mm lead equivalent", "0.05 mm lead equivalent" ], "answer_index": 1, "explanation": "The Bucky slot cover shields the gap at the side of the table at gonad level with at least 0.25 mm Pb equivalent.", "subcategory": "Radiation Protection" }, { "q": "During fluoroscopy, keeping the image receptor (image intensifier or flat panel) as close to the patient as possible will:", "options": [ "Reduce patient dose and improve image sharpness", "Increase magnification of the image", "Increase patient dose but reduce scatter", "Have no effect on patient dose" ], "answer_index": 0, "explanation": "Reducing the receptor-to-patient distance lowers the dose needed by automatic brightness control and reduces magnification blur.", "subcategory": "Radiation Protection" }, { "q": "Which change increases patient dose for a radiograph if receptor exposure is maintained?", "options": [ "Tighter collimation", "Adding a grid", "Increasing total filtration", "Increasing kVp and lowering mAs" ], "answer_index": 1, "explanation": "A grid absorbs part of the remnant beam, so mAs and patient dose must increase to maintain receptor exposure.", "subcategory": "Radiation Protection" }, { "q": "Doubling the mAs while keeping kVp and distance the same will make the patient's dose:", "options": [ "Decrease by half", "Increase four times", "Stay the same", "Double" ], "answer_index": 3, "explanation": "Patient dose is directly proportional to mAs.", "subcategory": "Radiation Protection" }, { "q": "What is the minimum total filtration required for a radiographic tube operating above 70 kVp?", "options": [ "2.5 mm aluminum equivalent", "5.0 mm lead equivalent", "0.5 mm aluminum equivalent", "1.0 mm aluminum equivalent" ], "answer_index": 0, "explanation": "Units operating above 70 kVp need at least 2.5 mm Al equivalent total filtration (inherent plus added).", "subcategory": "Radiation Protection" }, { "q": "Which practice most effectively reduces patient dose from repeated exposures?", "options": [ "Increasing the mAs to avoid noisy images", "Removing the grid for all adult exams", "Giving clear instructions and immobilizing the patient", "Using the lowest kVp possible for every exam" ], "answer_index": 2, "explanation": "Most repeats come from motion and positioning errors, so clear communication and immobilization prevent extra exposures.", "subcategory": "Radiation Protection" }, { "q": "Who is responsible for overseeing a facility's radiation safety program and reviewing dosimetry reports?", "options": [ "The chief radiographer only", "The state licensing board", "The radiation safety officer", "The referring physician" ], "answer_index": 2, "explanation": "The radiation safety officer is designated to run the radiation protection program, including personnel monitoring.", "subcategory": "Radiation Protection" }, { "q": "On an interventional fluoroscopy unit, the displayed cumulative reference air kerma is mainly used to monitor the risk of:", "options": [ "Contrast reactions", "Grid cutoff", "Hereditary effects", "Deterministic skin injury" ], "answer_index": 3, "explanation": "Reference point air kerma estimates skin dose and alerts staff to the possibility of skin injury in long procedures.", "subcategory": "Radiation Protection" }, { "q": "The Image Gently campaign promotes lower radiation doses specifically for:", "options": [ "Children", "Pregnant workers", "Elderly patients", "Interventional staff" ], "answer_index": 0, "explanation": "Image Gently focuses on pediatric imaging; Image Wisely focuses on adults.", "subcategory": "Radiation Protection" }, { "q": "A radiographer who is a patient for their own medical chest radiograph should:", "options": [ "Wear the dosimeter at collar level as usual", "Not wear their personal dosimeter during the exam", "Wear the dosimeter under the lead apron", "Place the dosimeter on the image receptor" ], "answer_index": 1, "explanation": "Personnel dosimeters record occupational exposure only, so they are not worn during one's own medical exams.", "subcategory": "Radiation Protection" }, { "q": "A radiographer realizes they left their dosimeter clipped to an apron hanging inside a fluoroscopy room for several days. The best action is to:", "options": [ "Say nothing and wait for the dose report", "Swap it with a coworker's dosimeter", "Report it to the radiation safety officer", "Reset the dosimeter by placing it in sunlight" ], "answer_index": 2, "explanation": "The reading may not reflect the worker's actual dose, so the RSO should be informed so the record can be evaluated.", "subcategory": "Radiation Protection" }, { "q": "What is the purpose of the control dosimeter that is shipped with a facility's personnel dosimeters?", "options": [ "To serve as a spare for a lost dosimeter", "To measure the leakage from each X-ray tube", "To record the dose received by patients", "To measure background and transit exposure for subtraction" ], "answer_index": 3, "explanation": "The control badge is kept away from radiation areas so background and shipping exposure can be subtracted from workers' readings.", "subcategory": "Radiation Protection" }, { "q": "Personnel dosimetry reports list a 'deep dose equivalent.' This dose is measured at a tissue depth of:", "options": [ "1 cm", "0.3 cm", "10 cm", "0.007 cm" ], "answer_index": 0, "explanation": "Deep dose is at 1 cm, lens dose at 0.3 cm and shallow (skin) dose at 0.007 cm.", "subcategory": "Radiation Protection" }, { "q": "For a C-arm used in the vertical (PA) orientation during surgery, the X-ray tube should be positioned:", "options": [ "Over the patient", "On the operator's side at a slant", "At the operator's head height", "Under the table" ], "answer_index": 3, "explanation": "With the tube below the table, the most intense scatter is directed downward, away from the staff's eyes and neck.", "subcategory": "Radiation Protection" }, { "q": "A thyroid shield is most useful for the radiographer during:", "options": [ "Fluoroscopy and C-arm procedures", "Overhead exposures made from the control booth", "Reading images at a workstation", "Processing plates in a CR reader" ], "answer_index": 0, "explanation": "During fluoroscopy staff stand near the patient where scatter can reach the radiosensitive thyroid.", "subcategory": "Radiation Protection" }, { "q": "In the United States, what is the largest single source of natural background radiation exposure?", "options": [ "Radioactive potassium in food", "Radon gas", "Terrestrial uranium in soil", "Cosmic radiation" ], "answer_index": 1, "explanation": "Inhaled radon and its decay products make up the largest share of natural background dose.", "subcategory": "Radiation Protection" }, { "q": "The average effective dose to a person in the United States from natural background radiation is about:", "options": [ "50 mSv per year", "30 mSv per year", "3 mSv per year", "0.03 mSv per year" ], "answer_index": 2, "explanation": "NCRP Report 160 places the natural background effective dose at roughly 3 mSv per year.", "subcategory": "Radiation Protection" } ] }, { "id": "image-production", "name": "Image Production", "main_points": [ "In digital imaging mAs mainly sets receptor exposure and image noise: too little causes quantum mottle, while displayed brightness is set by processing rather than by mAs.", "kVp affects receptor exposure, penetration and subject contrast; by the 15% rule, raising kVp 15% roughly doubles receptor exposure, so halving mAs keeps exposure about the same.", "Spatial resolution improves with a small focal spot, short OID, long SID, no motion and a smaller pixel or detector element pitch; it is measured in line pairs per millimeter.", "Magnification factor = SID / SOD; shape distortion (elongation or foreshortening) comes from misaligning the tube, part or image receptor.", "Grids absorb scatter to improve contrast; they are generally used for parts thicker than 10 cm or above 60 kVp, and grid conversion factors are 2 (5:1), 3 (6:1), 4 (8:1), 5 (12:1) and 6 (16:1).", "Grid cutoff results from off-level, off-center, off-focus (wrong SID) or upside-down focused grids; an upside-down focused grid causes severe loss of exposure at the edges.", "Anode heel effect: beam intensity is greater on the cathode side, so place the thicker end of the part (such as the hip end of the femur) under the cathode.", "AEC ends the exposure when its detectors reach a preset exposure; correct detector selection and centering are critical, and a backup timer (about 600 mAs) protects against tube overload and overexposure.", "The exposure indicator shows whether the receptor got the target exposure; a deviation index of 0 is ideal, +1 is about 26% over target and +3 is about double.", "Digital characteristics: bit depth sets gray levels (12 bits = 4,096), the Nyquist frequency is half the sampling frequency, and DQE describes how efficiently a detector turns X-rays into signal.", "Processing uses histogram analysis and look-up tables; window level controls brightness and window width controls contrast (narrower width = higher contrast).", "Indirect DR uses a scintillator (CsI or gadolinium oxysulfide) plus amorphous silicon photodiodes; direct DR uses amorphous selenium; CR uses photostimulable phosphor plates read by a laser." ], "vocabulary": [ { "term": "Receptor exposure", "definition": "The amount of radiation reaching the image receptor, controlled chiefly by mAs." }, { "term": "Quantum mottle", "definition": "Grainy noise caused by too few X-ray photons reaching the receptor." }, { "term": "Signal-to-noise ratio (SNR)", "definition": "Ratio of useful image signal to background noise; higher SNR gives a cleaner image." }, { "term": "Spatial resolution", "definition": "Ability of an imaging system to show small, closely spaced structures as separate." }, { "term": "Contrast resolution", "definition": "Ability to distinguish structures with similar attenuation as different shades of gray." }, { "term": "Detective quantum efficiency (DQE)", "definition": "Measure of how efficiently a detector converts incoming X-ray photons into a useful signal." }, { "term": "Modulation transfer function (MTF)", "definition": "Measure of how faithfully a system reproduces object contrast at different spatial frequencies." }, { "term": "Nyquist frequency", "definition": "The highest spatial frequency a digital system can record, equal to half the sampling frequency." }, { "term": "Bit depth", "definition": "Number of bits per pixel, which sets how many gray levels each pixel can show." }, { "term": "Detector element (DEL)", "definition": "The smallest light- or charge-collecting unit of a flat-panel detector, corresponding to a pixel." }, { "term": "Fill factor", "definition": "Percentage of a detector element's area that is sensitive to incoming signal." }, { "term": "Grid ratio", "definition": "Height of the grid strips divided by the distance between them." }, { "term": "Grid cutoff", "definition": "Unwanted absorption of primary photons by the grid, causing reduced exposure on the image." }, { "term": "Anode heel effect", "definition": "Variation in beam intensity along the long axis, with greater intensity on the cathode side." }, { "term": "Line focus principle", "definition": "Angling the anode target so the effective focal spot is smaller than the actual focal spot." }, { "term": "Deviation index (DI)", "definition": "Standardized number showing how far the actual receptor exposure differs from the target exposure." }, { "term": "Histogram", "definition": "Graph of pixel values in an image, used by software to identify useful data for rescaling." }, { "term": "Look-up table (LUT)", "definition": "Table that converts raw pixel values into displayed brightness and contrast values." }, { "term": "PACS", "definition": "Picture archiving and communication system used to store, retrieve and display digital images." }, { "term": "DICOM", "definition": "Standard format and protocol for storing and transmitting medical images between systems." } ], "quiz": [ { "q": "A technique of 20 mAs at 70 kVp gives ideal receptor exposure. To keep the same exposure using 80 kVp (about +15%), the new mAs should be about:", "options": [ "40 mAs", "20 mAs", "10 mAs", "5 mAs" ], "answer_index": 2, "explanation": "The 15% rule says a 15% kVp increase roughly doubles receptor exposure, so the mAs is halved to about 10." }, { "q": "A digital image shows a grainy, mottled appearance across the entire field. The most likely cause is:", "options": [ "excessive SID", "insufficient mAs", "too small a focal spot", "excessive collimation" ], "answer_index": 1, "explanation": "Too few photons reaching the receptor produces quantum mottle; increasing mAs raises photon count and SNR." }, { "q": "An object is 10 cm from the receptor at a 100 cm SID. What is the magnification factor?", "options": [ "0.9", "1.0", "1.11", "1.25" ], "answer_index": 2, "explanation": "MF = SID/SOD = 100/(100-10) = 100/90, or about 1.11." }, { "q": "Changing from no grid to a 12:1 grid requires the mAs to be multiplied by about:", "options": [ "2", "3", "4", "5" ], "answer_index": 3, "explanation": "The grid conversion factor for a 12:1 grid is 5, so 5 times the non-grid mAs keeps receptor exposure the same." }, { "q": "A focused grid placed upside down produces which appearance?", "options": [ "Exposure at the center with severe cutoff toward both edges", "Uniform loss of exposure across the image", "Increased exposure on the cathode side only", "Moire pattern across the entire image" ], "answer_index": 0, "explanation": "Inverted focused grid strips line up with the beam only at the center, so the periphery shows severe cutoff." }, { "q": "To use the anode heel effect on an AP thoracic spine, the patient should be positioned with:", "options": [ "the upper thoracic region under the anode", "the head under the cathode", "the spine perpendicular to the anode-cathode axis", "the lower thoracic region under the cathode" ], "answer_index": 3, "explanation": "The lower thoracic spine is thicker, so it goes under the cathode side, where beam intensity is greater." }, { "q": "Which change will improve spatial resolution?", "options": [ "Increasing OID", "Using a large focal spot", "Increasing SID", "Lengthening exposure time with a restless patient" ], "answer_index": 2, "explanation": "A longer SID reduces geometric unsharpness and magnification; greater OID, larger focal spots and motion all degrade resolution." }, { "q": "On a vendor using a standardized deviation index, a DI of +3 indicates the receptor received roughly:", "options": [ "half the target exposure", "the target exposure", "about double the target exposure", "about 26% more than target" ], "answer_index": 2, "explanation": "Each DI unit is about 26%; +3 corresponds to roughly twice the target exposure (10 to the power of 0.3 is about 2)." }, { "q": "Narrowing the window width on a displayed image will:", "options": [ "increase image contrast", "decrease image contrast", "increase brightness only", "improve spatial resolution" ], "answer_index": 0, "explanation": "Window width controls the range of gray shown; a narrower width shows fewer grays and higher contrast." }, { "q": "A digital system has a bit depth of 12. How many shades of gray can each pixel represent?", "options": [ "256", "1,024", "4,096", "16,384" ], "answer_index": 2, "explanation": "Gray levels = 2 to the power of bit depth; 2 to the 12th power is 4,096." }, { "q": "Which statement about indirect-conversion flat-panel DR is correct?", "options": [ "It uses amorphous selenium to convert X-rays directly to charge", "It stores the image on a photostimulable phosphor plate", "It requires a laser to read the latent image", "It uses a scintillator to convert X-rays to light before a photodiode creates charge" ], "answer_index": 3, "explanation": "Indirect DR uses a scintillator such as cesium iodide and amorphous silicon photodiodes; direct DR uses amorphous selenium, and CR uses laser-read phosphor plates." }, { "q": "As part of quality control, the collimator light field and the radiation field must align within what tolerance?", "options": [ "2% of the SID", "5% of the SID", "10% of the SID", "1 cm regardless of SID" ], "answer_index": 0, "explanation": "Light field to radiation field alignment must be accurate to within plus or minus 2% of the SID." } ], "bank": [ { "q": "A technique of 10 mAs at 40 in (100 cm) SID gives proper receptor exposure. Using the exposure maintenance formula, what mAs is needed at 72 in (180 cm)?", "options": [ "About 32 mAs", "About 18 mAs", "About 58 mAs", "About 5.6 mAs" ], "answer_index": 0, "explanation": "New mAs = old mAs x (new SID / old SID)^2 = 10 x (72/40)^2, about 32 mAs.", "subcategory": "Image Acquisition and Evaluation" }, { "q": "Which technique reduces the scatter reaching the image receptor without using a grid?", "options": [ "Increasing the field size", "Removing tube filtration", "Increasing kVp", "Air-gap technique (increased OID)" ], "answer_index": 3, "explanation": "With a larger OID, much of the obliquely scattered radiation misses the receptor, though magnification increases.", "subcategory": "Image Acquisition and Evaluation" }, { "q": "Which change increases the amount of scatter radiation produced in the patient?", "options": [ "Decreasing kVp", "Collimating closely to the part", "Compressing the abdomen", "Opening the collimation to a larger field size" ], "answer_index": 3, "explanation": "A larger irradiated volume produces more scatter; tight collimation and compression reduce it.", "subcategory": "Image Acquisition and Evaluation" }, { "q": "Which condition typically requires an increase in technical factors?", "options": [ "Ascites", "Emphysema", "Osteoporosis", "Pneumothorax" ], "answer_index": 0, "explanation": "Ascites is an additive condition that adds fluid to the abdomen; the others are destructive and need less exposure.", "subcategory": "Image Acquisition and Evaluation" }, { "q": "On an AEC PA chest, only the center ionization chamber (over the mediastinum and spine) is selected. The likely result is:", "options": [ "Underexposure of the lung fields", "Excessive receptor exposure in the lung fields", "Grid cutoff along the edges", "No effect, because AEC compensates for any chamber" ], "answer_index": 1, "explanation": "The dense mediastinum needs more exposure before the center chamber ends it, so the lungs are overexposed; the outer chambers over the lungs are used.", "subcategory": "Image Acquisition and Evaluation" }, { "q": "What is the main purpose of the AEC backup timer?", "options": [ "To select the ionization chambers automatically", "To end the exposure if the AEC does not terminate it, protecting the patient and tube", "To keep the image brightness constant", "To set the minimum possible exposure time" ], "answer_index": 1, "explanation": "The backup time (often about 150% of the expected time) prevents excessive exposure if the AEC fails or is set up incorrectly.", "subcategory": "Image Acquisition and Evaluation" }, { "q": "In digital radiography, wide collimation that leaves large areas of unattenuated raw beam around the part is most likely to cause:", "options": [ "Grid cutoff", "Elongation of the anatomy", "Quantum mottle in the anatomy", "A histogram analysis error with an incorrect exposure indicator" ], "answer_index": 3, "explanation": "Raw beam distorts the histogram, so the system rescales the image wrongly; collimate to the part and center correctly.", "subcategory": "Image Acquisition and Evaluation" }, { "q": "A wavy moire pattern appears on a CR image taken with a stationary grid. The most likely cause is:", "options": [ "Grid lines running parallel to the reader's laser scan direction", "A focal spot that is too small", "Using too much mAs", "Too short a SID" ], "answer_index": 0, "explanation": "When stationary grid lines are parallel to the scan lines and the grid frequency is close to the sampling frequency, aliasing produces moire.", "subcategory": "Image Acquisition and Evaluation" }, { "q": "A detector samples at 10 pixels per mm. What is its maximum resolvable spatial frequency (Nyquist frequency)?", "options": [ "5 lp/mm", "10 lp/mm", "2.5 lp/mm", "20 lp/mm" ], "answer_index": 0, "explanation": "The Nyquist frequency is half the sampling frequency; finer detail is aliased.", "subcategory": "Image Acquisition and Evaluation" }, { "q": "If the field of view stays the same and the matrix size increases, what happens?", "options": [ "Spatial resolution worsens", "Pixels get larger and spatial resolution improves", "Pixels get smaller and spatial resolution improves", "Pixel size is unchanged" ], "answer_index": 2, "explanation": "Pixel size equals FOV divided by matrix size, so a larger matrix means smaller pixels and finer detail.", "subcategory": "Image Acquisition and Evaluation" }, { "q": "Why is dose creep a concern with digital receptors?", "options": [ "Digital detectors cannot record low exposures", "Overexposed images still look acceptable after processing, so exposures can drift upward unnoticed", "Digital images look darker when overexposed, causing repeats", "Processing removes all quantum mottle" ], "answer_index": 1, "explanation": "Wide dynamic range and automatic rescaling hide overexposure, so radiographers must watch the exposure indicator.", "subcategory": "Image Acquisition and Evaluation" }, { "q": "Which processing step applies a predetermined set of values to give an image its contrast for a specific body part?", "options": [ "Stitching", "Edge enhancement", "Electronic masking", "Look-up table (LUT)" ], "answer_index": 3, "explanation": "The LUT maps raw pixel values to display values so that each exam type has consistent brightness and contrast.", "subcategory": "Image Acquisition and Evaluation" }, { "q": "With the CR perpendicular to the IR, a long bone that is not parallel to the receptor will appear:", "options": [ "Sharper than normal", "Foreshortened", "Elongated", "Magnified uniformly but not distorted" ], "answer_index": 1, "explanation": "A part tilted relative to the receptor is projected shorter; angling the tube along the part's long axis produces elongation.", "subcategory": "Image Acquisition and Evaluation" }, { "q": "Focal spot 1.2 mm, OID 10 cm, SID 100 cm. What is the geometric unsharpness (penumbra width)?", "options": [ "About 0.011 mm", "About 0.12 mm", "About 1.2 mm", "About 0.13 mm" ], "answer_index": 3, "explanation": "Unsharpness = focal spot x OID / SOD = 1.2 x 10 / 90, about 0.13 mm.", "subcategory": "Image Acquisition and Evaluation" }, { "q": "What is the most effective way to control involuntary motion such as peristalsis or heart motion?", "options": [ "Use the shortest possible exposure time", "Use sandbags and sponges", "Give clear breathing instructions", "Increase the SID" ], "answer_index": 0, "explanation": "Involuntary motion cannot be stopped by instructions or immobilization, so a short exposure time is the main control.", "subcategory": "Image Acquisition and Evaluation" }, { "q": "On a vendor that uses an S-number as its exposure indicator, a higher S value means:", "options": [ "Better spatial resolution", "Higher kVp was used", "More exposure reached the receptor", "Less exposure reached the receptor" ], "answer_index": 3, "explanation": "The S-number is inversely related to receptor exposure; a high S value suggests underexposure and possible mottle.", "subcategory": "Image Acquisition and Evaluation" }, { "q": "A linear grid is used with the CR angled across (perpendicular to) the grid lines. The result is:", "options": [ "Better scatter cleanup", "Grid cutoff with reduced receptor exposure", "A moire pattern with no loss of exposure", "Increased spatial resolution" ], "answer_index": 1, "explanation": "Angling across the lead strips makes them absorb primary photons; tube angles must run parallel to the grid lines.", "subcategory": "Image Acquisition and Evaluation" }, { "q": "Compared with a single-phase unit, a high-frequency generator produces:", "options": [ "Nearly constant voltage (under 1% ripple) and a higher average photon energy", "About 100% voltage ripple", "Lower beam quality at the same kVp", "More heat units per exposure for the same output" ], "answer_index": 0, "explanation": "High-frequency generators give almost constant potential, so the beam is more efficient and penetrating at a given kVp.", "subcategory": "Equipment Operation and Quality Assurance" }, { "q": "In the X-ray circuit, which component converts alternating current into direct current?", "options": [ "Autotransformer", "Rectifier (solid-state diodes)", "Filament transformer", "Step-up transformer" ], "answer_index": 1, "explanation": "Rectifiers ensure current flows in one direction through the tube, from cathode to anode.", "subcategory": "Equipment Operation and Quality Assurance" }, { "q": "What is the main purpose of a rotating anode?", "options": [ "To make the effective focal spot smaller", "To filter low-energy photons", "To speed up thermionic emission", "To spread heat over a larger target area so higher techniques can be used" ], "answer_index": 3, "explanation": "Rotation spreads the electron beam's heat over the whole focal track, raising the tube's heat capacity.", "subcategory": "Equipment Operation and Quality Assurance" }, { "q": "Holding the exposure switch in the 'prep' (rotor) position for long periods shortens tube life mainly because it:", "options": [ "Wears out the collimator lamp", "Keeps the filament heated, evaporating tungsten", "Cools the anode too quickly", "Increases the anode angle" ], "answer_index": 1, "explanation": "Prolonged filament heating thins the filament and deposits tungsten on the tube envelope, which can cause arcing.", "subcategory": "Equipment Operation and Quality Assurance" }, { "q": "An image intensifier has a 25 cm input phosphor, a 2.5 cm output phosphor and a flux gain of 50. What is its brightness gain?", "options": [ "2,500", "100", "500", "5,000" ], "answer_index": 3, "explanation": "Minification gain = (25/2.5)^2 = 100; brightness gain = minification gain x flux gain = 100 x 50 = 5,000.", "subcategory": "Equipment Operation and Quality Assurance" }, { "q": "Switching an image intensifier to a magnification mode (smaller field of view) will:", "options": [ "Improve spatial resolution but increase patient dose", "Reduce patient dose and improve resolution", "Reduce spatial resolution and patient dose", "Have no effect on dose" ], "answer_index": 0, "explanation": "Magnification uses a smaller part of the input phosphor, so the ABC raises exposure to keep brightness while resolution improves.", "subcategory": "Equipment Operation and Quality Assurance" }, { "q": "During fluoroscopy, what does automatic brightness control (ABC) do as the beam moves from the abdomen to the thinner lung bases?", "options": [ "Switches to magnification mode", "Raises the mA to keep brightness constant", "Lowers the mA and/or kVp to keep image brightness constant", "Turns off the beam" ], "answer_index": 2, "explanation": "ABC adjusts exposure factors to the thickness and density of the part so the displayed brightness stays steady.", "subcategory": "Equipment Operation and Quality Assurance" }, { "q": "In computed radiography, any remaining latent image on the imaging plate is erased by:", "options": [ "Exposure to intense white light", "Scanning it with a helium-neon laser", "Exposing it to a strong magnet", "Heating the plate" ], "answer_index": 0, "explanation": "After the laser reads the plate, bright light releases trapped electrons so the plate is ready for reuse.", "subcategory": "Equipment Operation and Quality Assurance" }, { "q": "A DR detector shows the same pattern of nonuniformity on every image. The most appropriate corrective action is to:", "options": [ "Apply edge enhancement to each image", "Use a higher grid ratio", "Perform a detector (flat-field/gain) calibration as the manufacturer directs", "Increase mAs for every exam" ], "answer_index": 2, "explanation": "Calibration corrects variations between detector elements; persistent problems are reported to service.", "subcategory": "Equipment Operation and Quality Assurance" }, { "q": "In QC testing, radiation output reproducibility is acceptable when the coefficient of variation is no more than:", "options": [ "0.10 (10%)", "0.01 (1%)", "0.05 (5%)", "0.20 (20%)" ], "answer_index": 2, "explanation": "Repeated exposures at the same settings should agree within a coefficient of variation of 0.05.", "subcategory": "Equipment Operation and Quality Assurance" }, { "q": "mA (mAs) linearity testing checks that output stays proportional between adjacent mA stations. The usual tolerance is:", "options": [ "Within 1%", "Within 25%", "Within 10%", "Within 50%" ], "answer_index": 2, "explanation": "Output per mAs at adjacent mA settings should agree within 10%.", "subcategory": "Equipment Operation and Quality Assurance" }, { "q": "Measuring the half-value layer (HVL) at a known kVp is used to verify that:", "options": [ "Total beam filtration is adequate", "The exposure timer is accurate", "The focal spot is the correct size", "The light and radiation fields align" ], "answer_index": 0, "explanation": "HVL reflects beam quality; if it falls below the minimum for the kVp, filtration is inadequate.", "subcategory": "Equipment Operation and Quality Assurance" }, { "q": "Which test tool is used to measure the effective focal spot size?", "options": [ "Penetrometer (aluminum step wedge)", "Spinning top test", "Star pattern, slit camera or pinhole camera", "Collimator test template with nine pennies" ], "answer_index": 2, "explanation": "Focal spot tools image the focal spot or its resolving ability; spinning tops checked timers on older generators.", "subcategory": "Equipment Operation and Quality Assurance" }, { "q": "Which test pattern is commonly used to check the luminance, resolution and grayscale of diagnostic display monitors?", "options": [ "Star test pattern", "Penetrometer step wedge", "AAPM TG18 (or SMPTE) test pattern", "Wire mesh test" ], "answer_index": 2, "explanation": "TG18 and SMPTE patterns let users and physicists evaluate monitor brightness, contrast, resolution and distortion.", "subcategory": "Equipment Operation and Quality Assurance" }, { "q": "Repeat (reject) analysis is primarily used to:", "options": [ "Measure focal spot size", "Calibrate the AEC", "Calculate each technologist's annual dose", "Find the causes of repeated images so corrective action can lower patient dose and cost" ], "answer_index": 3, "explanation": "Tracking repeat rates and reasons shows where positioning, technique or equipment problems need attention.", "subcategory": "Equipment Operation and Quality Assurance" }, { "q": "Which standard lets imaging equipment and PACS from different vendors exchange images and their related data?", "options": [ "JPEG", "DICOM", "HL7", "HIPAA" ], "answer_index": 1, "explanation": "DICOM sets the format and communication rules for medical images; HL7 handles text-based clinical and administrative messages.", "subcategory": "Equipment Operation and Quality Assurance" }, { "q": "A technologist raises kVp from 70 to 85 and lowers mAs to keep receptor exposure the same. How does subject contrast change?", "options": [ "It decreases, giving more shades of gray", "It increases because the beam is more penetrating", "It increases, giving fewer shades of gray", "It stays the same because mAs was adjusted" ], "answer_index": 0, "explanation": "Higher kVp makes the beam more penetrating and raises the share of Compton interactions, so attenuation differences shrink and contrast drops.", "subcategory": "Image Acquisition and Evaluation" }, { "q": "While viewing a digital image, the technologist raises the window level. The displayed image will appear:", "options": [ "Lower in contrast", "Darker overall", "Brighter overall", "Higher in contrast" ], "answer_index": 1, "explanation": "Raising the window level centers the display on higher pixel values, so brightness decreases; contrast is controlled by window width.", "subcategory": "Image Acquisition and Evaluation" }, { "q": "Grid ratio is defined as the:", "options": [ "Thickness of the lead strips divided by their height", "Distance between strips divided by the strip height", "Height of the lead strips divided by the distance between them", "Number of lead strips per centimeter of grid" ], "answer_index": 2, "explanation": "Grid ratio is h/D, strip height over the interspace width; strips per cm is grid frequency.", "subcategory": "Image Acquisition and Evaluation" }, { "q": "A focused grid with a 100 cm focal range is used at 150 cm SID, with the beam centered and the grid level. The expected result is:", "options": [ "No grid cutoff because the beam is centered", "Uniform loss of exposure across the whole image", "Loss of exposure on one side of the image only", "Loss of exposure toward both edges of the image" ], "answer_index": 3, "explanation": "Using a focused grid outside its focal range (off-focus) causes peripheral cutoff on both sides, since the strips no longer line up with the diverging beam.", "subcategory": "Image Acquisition and Evaluation" }, { "q": "Which combination of distances produces the LEAST size distortion?", "options": [ "180 cm SID with 3 cm OID", "180 cm SID with 10 cm OID", "100 cm SID with 3 cm OID", "100 cm SID with 10 cm OID" ], "answer_index": 0, "explanation": "Magnification is minimized with the longest SID and the shortest OID.", "subcategory": "Image Acquisition and Evaluation" }, { "q": "Compared with screen-film systems, digital image receptors have a:", "options": [ "Fixed contrast that cannot be adjusted", "Wider dynamic range and more exposure latitude", "Lower sensitivity to scatter radiation", "Narrower dynamic range but higher latitude" ], "answer_index": 1, "explanation": "Digital receptors respond linearly over a wide range of exposures, so they tolerate exposure errors better than film, which also makes dose creep possible.", "subcategory": "Image Acquisition and Evaluation" }, { "q": "A lateral knee is processed after 'lumbar spine' was mistakenly selected as the body part. The most likely result is:", "options": [ "Grid lines appearing across the image", "Increased patient dose on the next exposure", "Poor brightness and contrast from a histogram and LUT mismatch", "Geometric distortion of the femoral condyles" ], "answer_index": 2, "explanation": "The selected algorithm sets the expected histogram and LUT; a mismatch can cause histogram analysis error, improper display, and an inaccurate exposure indicator.", "subcategory": "Image Acquisition and Evaluation" }, { "q": "A processed digital image shows a dark halo outlining a metal hip prosthesis. This is most often caused by:", "options": [ "An off-center focused grid", "Insufficient collimation of the beam", "Too low a kVp for the body part", "Excessive edge-enhancement processing" ], "answer_index": 3, "explanation": "Strong edge enhancement (unsharp masking) creates rebound or halo artifacts at high-contrast boundaries such as metal.", "subcategory": "Image Acquisition and Evaluation" }, { "q": "Why should electronic masking (shuttering) after exposure never replace proper collimation?", "options": [ "It does not reduce the dose the patient already received", "It prevents the image from being sent to PACS", "It increases the exposure indicator value", "It permanently erases the original raw data" ], "answer_index": 0, "explanation": "Masking only covers the unexposed border on the display; only beam restriction before exposure limits the irradiated tissue and scatter.", "subcategory": "Image Acquisition and Evaluation" }, { "q": "Using a manual technique, the field size on an AP abdomen is reduced from 35 x 43 cm to 24 x 30 cm. What is the effect?", "options": [ "Receptor exposure rises because of less scatter", "Less scatter reaches the IR, so contrast improves", "Spatial resolution worsens because of less scatter", "More scatter reaches the IR, so contrast drops" ], "answer_index": 1, "explanation": "A smaller field irradiates less tissue, producing less scatter; receptor exposure falls slightly and contrast improves.", "subcategory": "Image Acquisition and Evaluation" }, { "q": "A digital system can resolve 5 line pairs per mm. What is the smallest object it can resolve?", "options": [ "0.5 mm", "0.05 mm", "0.1 mm", "0.2 mm" ], "answer_index": 2, "explanation": "One line pair is a line plus a space, so the smallest object is 1/(2 x 5 lp/mm) = 0.1 mm.", "subcategory": "Image Acquisition and Evaluation" }, { "q": "A detector 43 cm wide has 3,000 pixels across its width. What is the approximate pixel pitch?", "options": [ "0.07 mm", "0.28 mm", "1.4 mm", "0.14 mm" ], "answer_index": 3, "explanation": "Pixel pitch is width divided by pixel count: 430 mm / 3,000 is about 0.14 mm.", "subcategory": "Image Acquisition and Evaluation" }, { "q": "Detective quantum efficiency (DQE) describes how well a receptor:", "options": [ "Turns incoming x-ray photons into useful image signal", "Shows fine detail at high spatial frequencies", "Erases its previous image before the next exposure", "Reduces the amount of scatter reaching it" ], "answer_index": 0, "explanation": "A higher DQE means more of the incident photons become useful signal, so a diagnostic image needs less dose.", "subcategory": "Image Acquisition and Evaluation" }, { "q": "In a direct-conversion flat-panel detector, which material converts x-ray photons straight into electrical charge?", "options": [ "Gadolinium oxysulfide", "Amorphous selenium", "Barium fluorohalide", "Cesium iodide" ], "answer_index": 1, "explanation": "Amorphous selenium is a photoconductor that makes charge directly; CsI and gadolinium oxysulfide are scintillators used in indirect systems.", "subcategory": "Image Acquisition and Evaluation" }, { "q": "In a computed radiography reader, the exposed imaging plate is scanned with a laser and emits light. Which pairing is correct?", "options": [ "Blue laser in; red light out", "Infrared laser in; red light out", "Red laser in; blue-violet light out", "Red laser in; green light out" ], "answer_index": 2, "explanation": "The red laser stimulates the trapped electrons, which release photostimulated light in the blue-violet range for the photodetector.", "subcategory": "Image Acquisition and Evaluation" }, { "q": "Several exposed CR plates sit unprocessed for 8 hours. What is the main concern?", "options": [ "The images gain contrast as they wait", "The phosphor layer peels off the plate", "The plates become more sensitive to light", "The latent image fades, reducing signal" ], "answer_index": 3, "explanation": "The latent image on a PSP plate fades over time (a sizeable loss within hours), so plates should be read promptly.", "subcategory": "Image Acquisition and Evaluation" }, { "q": "Where should the lead anatomic side marker be placed?", "options": [ "Inside the collimated field, clear of anatomy of interest", "Outside the collimated field to protect the anatomy", "Directly over the area of clinical interest", "Anywhere, because a marker can be added later" ], "answer_index": 0, "explanation": "A marker must appear in the exposed field without hiding anatomy; electronic annotation is not a substitute for a lead marker at exposure.", "subcategory": "Image Acquisition and Evaluation" }, { "q": "A DR image of the hand was grossly overexposed and the soft tissue edges have disappeared into black. What is true?", "options": [ "Rescaling will fully correct the image with no repeat", "The detector saturated and that data cannot be recovered", "Raising the window level will restore the soft tissue", "The exposure indicator will read below the target" ], "answer_index": 1, "explanation": "Extreme overexposure saturates detector elements, so the lost information cannot be rebuilt by processing.", "subcategory": "Image Acquisition and Evaluation" }, { "q": "A grid is generally recommended when the part thickness and kVp exceed:", "options": [ "15 cm and 90 kVp", "20 cm and 100 kVp", "10 cm and 60 kVp", "5 cm and 50 kVp" ], "answer_index": 2, "explanation": "Parts thicker than about 10 cm at more than about 60 kVp produce enough scatter that a grid is needed for contrast.", "subcategory": "Image Acquisition and Evaluation" }, { "q": "On an AEC AP hip, the selected chamber lies directly under a metal hip replacement. The most likely result is:", "options": [ "Receptor exposure is unaffected by the metal", "The image is underexposed with quantum mottle", "The backup timer ends the exposure at once", "The image is overexposed and patient dose increases" ], "answer_index": 3, "explanation": "The dense metal attenuates the beam over the chamber, so the AEC keeps exposing until enough signal arrives, overexposing the surrounding anatomy.", "subcategory": "Image Acquisition and Evaluation" }, { "q": "As kVp increases in the diagnostic range, which change in x-ray interactions occurs in the patient?", "options": [ "Compton scatter becomes relatively more common than photoelectric absorption", "Coherent scatter becomes the main interaction", "Photoelectric absorption becomes more common than Compton scatter", "Pair production begins to occur" ], "answer_index": 0, "explanation": "Photoelectric absorption drops off faster with energy than Compton scatter, so higher kVp yields relatively more scatter and less contrast.", "subcategory": "Image Acquisition and Evaluation" }, { "q": "On a DR system, the mAs for a knee is doubled with no other change. Which result is expected?", "options": [ "Contrast doubles and noise is unchanged", "Brightness looks about the same but noise drops and dose doubles", "The image looks twice as dark on the monitor", "The exposure indicator stays the same" ], "answer_index": 1, "explanation": "Automatic rescaling keeps displayed brightness steady, so extra mAs shows up as less noise, a higher exposure indicator, and twice the patient dose.", "subcategory": "Image Acquisition and Evaluation" }, { "q": "The exposure indicator on a digital image is best described as a measure of:", "options": [ "Skin entrance dose at the surface", "Effective dose to the patient", "Radiation reaching the image receptor", "Scatter produced in the patient" ], "answer_index": 2, "explanation": "The exposure indicator reflects incident exposure at the detector, not patient dose, though it helps keep technique and dose appropriate.", "subcategory": "Image Acquisition and Evaluation" }, { "q": "A technique uses 30 mAs with a 12:1 grid (conversion factor 5). What mAs is needed with a 6:1 grid (factor 3) for the same receptor exposure?", "options": [ "50 mAs", "10 mAs", "15 mAs", "18 mAs" ], "answer_index": 3, "explanation": "New mAs = 30 x (3/5) = 18 mAs; a lower-ratio grid absorbs less radiation and needs less mAs.", "subcategory": "Image Acquisition and Evaluation" }, { "q": "A fracture fragment measures 12 mm on the image, and the magnification factor is 1.2. What is its actual size?", "options": [ "10 mm", "14.4 mm", "8 mm", "12 mm" ], "answer_index": 0, "explanation": "Object size = image size / magnification factor = 12 / 1.2 = 10 mm.", "subcategory": "Image Acquisition and Evaluation" }, { "q": "A lateral lumbar spine is noisy over the dense vertebral bodies even though overall brightness looks fine. The best correction is to:", "options": [ "Decrease kVp to raise contrast", "Increase kVp to penetrate the part", "Apply more edge enhancement", "Widen the window width" ], "answer_index": 1, "explanation": "Underpenetration leaves too few photons under dense anatomy; more kVp is needed because processing cannot add missing signal.", "subcategory": "Image Acquisition and Evaluation" }, { "q": "In the x-ray circuit, the high-voltage (step-up) transformer is used to:", "options": [ "Lower voltage to heat the filament", "Let the technologist select the kVp", "Raise incoming voltage to the kilovolt range", "Convert alternating to direct current" ], "answer_index": 2, "explanation": "The step-up transformer raises line voltage to the tens of thousands of volts needed across the tube; the rectifier makes it direct current.", "subcategory": "Equipment Operation and Quality Assurance" }, { "q": "Which component lets the operator select kVp by adjusting voltage before it reaches the step-up transformer?", "options": [ "Rectifier bridge", "Exposure timer", "Step-down transformer", "Autotransformer" ], "answer_index": 3, "explanation": "The autotransformer has a single winding and works by self-induction, letting the console vary the voltage fed to the high-voltage transformer.", "subcategory": "Equipment Operation and Quality Assurance" }, { "q": "Tube current (mA) is controlled mainly by adjusting the:", "options": [ "Filament current through a step-down transformer", "Speed of the rotating anode", "Voltage across the anode and cathode", "Size of the focusing cup" ], "answer_index": 0, "explanation": "Changing filament current changes filament temperature, and thus how many electrons are boiled off by thermionic emission.", "subcategory": "Equipment Operation and Quality Assurance" }, { "q": "Electrons are released from the hot tungsten filament by a process called:", "options": [ "Bremsstrahlung emission", "Thermionic emission", "Characteristic emission", "Photoelectric emission" ], "answer_index": 1, "explanation": "Heating the filament gives outer-shell electrons enough energy to escape, forming the electron cloud at the cathode.", "subcategory": "Equipment Operation and Quality Assurance" }, { "q": "What is the purpose of the negatively charged focusing cup?", "options": [ "To absorb off-focus radiation leaving the tube", "To cool the filament between exposures", "To narrow the electron stream onto the focal spot", "To spin the anode during exposure" ], "answer_index": 2, "explanation": "The focusing cup's negative charge repels the electrons into a tight beam aimed at the target.", "subcategory": "Equipment Operation and Quality Assurance" }, { "q": "On a dual-focus tube, the small focal spot is the better choice for:", "options": [ "Large parts that need very high mA", "Reducing the heel effect on a long femur", "Short exposure times on a lateral lumbar spine", "Small parts where fine detail matters, at modest mA" ], "answer_index": 3, "explanation": "The small focal spot gives sharper detail but tolerates less heat, so it suits extremities and other small parts at lower mA.", "subcategory": "Equipment Operation and Quality Assurance" }, { "q": "Tungsten is chosen for the anode target mainly because of its:", "options": [ "High atomic number and high melting point", "Ability to emit light when struck", "Low atomic number and fast cooling", "Low cost and light weight" ], "answer_index": 0, "explanation": "Tungsten (Z = 74) produces x-rays efficiently and withstands heat, melting at about 3,400 degrees C.", "subcategory": "Equipment Operation and Quality Assurance" }, { "q": "When projectile electrons strike the target, about how much of their kinetic energy becomes heat?", "options": [ "About 1%", "About 99%", "About 10%", "About 50%" ], "answer_index": 1, "explanation": "X-ray production is very inefficient; roughly 1% becomes x-rays and the rest is heat.", "subcategory": "Equipment Operation and Quality Assurance" }, { "q": "During fluoroscopy, the last-image-hold feature:", "options": [ "Saves every frame automatically to PACS", "Raises the dose rate to sharpen the image", "Keeps the final frame on the monitor without more exposure", "Records a video loop at a higher dose rate" ], "answer_index": 2, "explanation": "Last-image hold lets the operator study the anatomy after releasing the pedal, cutting beam-on time.", "subcategory": "Equipment Operation and Quality Assurance" }, { "q": "A technologist checks whether a single exposure at a given kVp, mA and time is safe for the tube. Which chart is used?", "options": [ "Technique conversion chart", "Housing cooling chart", "Anode cooling chart", "Radiographic tube rating chart" ], "answer_index": 3, "explanation": "The tube rating chart shows the maximum safe exposure combinations for a focal spot; cooling charts show heat dissipation over time.", "subcategory": "Equipment Operation and Quality Assurance" }, { "q": "Off-focus radiation is best reduced by the collimator's:", "options": [ "First-stage shutters placed close to the tube window", "Added aluminum filtration", "Light field mirror", "Positive beam limitation sensor" ], "answer_index": 0, "explanation": "Entrance shutters near the focal spot absorb x-rays made outside the focal spot before they spread into the field.", "subcategory": "Equipment Operation and Quality Assurance" }, { "q": "Which device is commonly used in QC to check kVp accuracy without opening the generator?", "options": [ "A line-pair test tool", "A noninvasive kVp meter", "A star test pattern", "A wire-mesh test tool" ], "answer_index": 1, "explanation": "Noninvasive kVp meters measure beam penetration with filtered detectors; star patterns test focal spot size and wire mesh tests contact or uniformity.", "subcategory": "Equipment Operation and Quality Assurance" }, { "q": "In a light-localizing collimator, the light bulb is the same distance from the mirror as the focal spot so that:", "options": [ "The bulb does not overheat during exposure", "The mirror absorbs off-focus radiation", "The light field matches the x-ray field", "The heel effect is reduced" ], "answer_index": 2, "explanation": "Placing the bulb at the virtual focal spot makes the light outline follow the same divergence as the x-ray beam.", "subcategory": "Equipment Operation and Quality Assurance" }, { "q": "In an image intensifier, which component converts light from the input phosphor into electrons?", "options": [ "Output phosphor", "Anode", "Electrostatic lenses", "Photocathode" ], "answer_index": 3, "explanation": "The cesium iodide input phosphor turns x-rays into light, and the photocathode emits electrons in response (photoemission).", "subcategory": "Equipment Operation and Quality Assurance" }, { "q": "Which distortion is typical of image-intensified fluoroscopy but absent with flat-panel fluoroscopy?", "options": [ "Pincushion distortion at the edges of the image", "Quantum mottle at very low dose", "Motion blur from patient movement", "Magnification from a long OID" ], "answer_index": 0, "explanation": "The curved input phosphor of an image intensifier causes pincushion distortion and vignetting; flat panels avoid both.", "subcategory": "Equipment Operation and Quality Assurance" }, { "q": "A DR detector has a few nonfunctioning detector elements. How are they usually handled during routine processing?", "options": [ "They are always shown as white dots", "Their values are filled in from neighboring elements", "The whole detector must be replaced right away", "The exposure is repeated with a different grid" ], "answer_index": 1, "explanation": "A bad-pixel map flags dead elements, and software interpolates their values from surrounding elements.", "subcategory": "Equipment Operation and Quality Assurance" }, { "q": "In a rotating anode tube, where is the stator located?", "options": [ "Inside the focusing cup", "Between the filament and the target", "Outside the glass envelope", "Inside the glass envelope on the anode stem" ], "answer_index": 2, "explanation": "The stator coils sit outside the envelope and drive the rotor inside it by electromagnetic induction.", "subcategory": "Equipment Operation and Quality Assurance" }, { "q": "Radiographic exposure switches require continuous pressure and stop the exposure as soon as they are released. This design is called a:", "options": [ "Backup timer", "Interlock circuit breaker", "Rotor prep switch", "Dead-man switch" ], "answer_index": 3, "explanation": "A dead-man switch ensures exposure can continue only while the operator actively holds it.", "subcategory": "Equipment Operation and Quality Assurance" }, { "q": "Over a tube's life, tungsten vaporizes and coats the inside of the glass envelope. This can lead to:", "options": [ "Arcing and tube failure", "Less filtration of the beam", "A smaller effective focal spot", "Faster anode rotation" ], "answer_index": 0, "explanation": "The metal coating can let current arc to the glass, and it also adds filtration; it is a common cause of tube failure.", "subcategory": "Equipment Operation and Quality Assurance" }, { "q": "Why should the manufacturer's tube warm-up be done before high exposures on a cold tube?", "options": [ "To align the collimator light field", "To prevent cracking of the cold anode", "To clear residual CR images", "To calibrate the exposure indicator" ], "answer_index": 1, "explanation": "A sudden large heat load on a cold anode can crack or pit it; gradual warming spreads the heat safely.", "subcategory": "Equipment Operation and Quality Assurance" }, { "q": "Which type of generator has the greatest voltage ripple?", "options": [ "Three-phase 6-pulse", "Three-phase 12-pulse", "Single-phase full-wave", "High-frequency" ], "answer_index": 2, "explanation": "Single-phase voltage drops to zero each cycle (100% ripple), versus about 13% for 6-pulse, 4% for 12-pulse and under 1% for high-frequency.", "subcategory": "Equipment Operation and Quality Assurance" }, { "q": "Which standard is used to exchange text data such as orders, results and demographics between the HIS and RIS?", "options": [ "DICOM", "TCP/IP", "JPEG", "HL7" ], "answer_index": 3, "explanation": "HL7 handles text-based health information messaging; DICOM handles the images and their attached data.", "subcategory": "Equipment Operation and Quality Assurance" }, { "q": "Lossless image compression for archiving means the image:", "options": [ "Can be rebuilt exactly as it was", "Loses some fine detail permanently", "Is stored at a lower bit depth", "Cannot be viewed on a workstation" ], "answer_index": 0, "explanation": "Lossless compression saves space without discarding data; lossy compression permanently removes some information.", "subcategory": "Equipment Operation and Quality Assurance" }, { "q": "On a capacitor-discharge mobile unit, what happens to kVp during an exposure?", "options": [ "It drops to zero halfway through", "It falls steadily as the capacitor discharges", "It rises steadily during the exposure", "It stays constant from start to finish" ], "answer_index": 1, "explanation": "As charge leaves the capacitor, tube voltage falls (about 1 kV per mAs), unlike battery-powered units with a steady output.", "subcategory": "Equipment Operation and Quality Assurance" }, { "q": "In a typical radiographic AEC system, the ionization chambers are located:", "options": [ "Inside the x-ray tube housing", "Between the tube and the collimator", "Between the patient and the image receptor", "Behind the image receptor" ], "answer_index": 2, "explanation": "Entrance-type chambers sit in front of the receptor so they sample the radiation exiting the patient without leaving a visible image.", "subcategory": "Equipment Operation and Quality Assurance" } ] }, { "id": "procedures", "name": "Procedures", "main_points": [ "PA chest: erect, 72 in (180 cm) SID, shoulders rolled forward to clear the scapulae, CR at T7, exposure on full second inspiration; at least 10 posterior ribs should show above the diaphragm.", "Use a horizontal beam to show air-fluid levels; a left lateral decubitus abdomen (right side up) best shows free intraperitoneal air, ideally after the patient has been on their side for several minutes.", "Skull baselines: PA axial Caldwell uses CR 15 degrees caudad to the OML (petrous ridges in the lower third of the orbits); AP axial Towne uses 30 degrees caudad to the OML (or 37 to the IOML), placing the dorsum sellae within the foramen magnum.", "Parietoacanthial (Waters): OML 37 degrees to the IR with the mentomeatal line perpendicular, putting the petrous ridges just below the maxillary sinuses; sinus views are done erect with a horizontal beam.", "Cervical spine: AP axial with 15-20 degrees cephalad, open-mouth view for C1-C2, lateral at 72 in SID with shoulders depressed, and the swimmer's lateral when C7-T1 is not seen.", "Cervical obliques: anterior obliques (RAO/LAO, CR 15-20 degrees caudad) show the intervertebral foramina closest to the IR; posterior obliques (RPO/LPO, CR cephalad) show those farthest from it.", "Lumbar 45-degree obliques show the zygapophyseal joints as the 'Scotty dog': posterior obliques show the downside joints, and the dog's neck is the pars interarticularis.", "AP pelvis or hip: rotate the legs 15-20 degrees internally to place the femoral necks in profile, unless a fracture is suspected; then use a cross-table axiolateral (Danelius-Miller) without moving the leg.", "Upper GI: RAO shows the barium-filled pylorus and duodenal bulb, LPO shows an air-filled bulb in double-contrast studies, and the right lateral shows the retrogastric space; an esophagram RAO places the esophagus between the spine and heart.", "Elbow: the medial (internal) oblique shows the coronoid process in profile and the lateral (external) oblique frees the radial head and neck; the scaphoid is best shown on a PA wrist with ulnar deviation.", "Shoulder: external rotation puts the greater tubercle in profile laterally, internal rotation puts the lesser tubercle in profile medially, Grashey (35-45 degrees toward the affected side) shows the glenoid in profile, and the scapular Y is used for dislocations.", "Ankle mortise uses 15-20 degrees internal rotation to open the whole mortise; the AP foot uses a CR angled 10 degrees toward the heel, and the lateral knee is flexed 20-30 degrees with a CR 5-7 degrees cephalad." ], "vocabulary": [ { "term": "Orbitomeatal line (OML)", "definition": "Positioning line from the outer canthus of the eye to the center of the external auditory meatus." }, { "term": "Infraorbitomeatal line (IOML)", "definition": "Line from the infraorbital margin to the external auditory meatus, about 7 degrees from the OML." }, { "term": "Mentomeatal line (MML)", "definition": "Line from the chin (mentum) to the external auditory meatus, used for the Waters projection." }, { "term": "Acanthion", "definition": "Point where the nasal septum meets the upper lip, the CR exit point for the Waters projection." }, { "term": "Decubitus position", "definition": "Patient lying down with the X-ray beam directed horizontally." }, { "term": "Projection", "definition": "The path of the central ray as it passes through the body, such as AP or PA." }, { "term": "Pars interarticularis", "definition": "The portion of the lamina between the superior and inferior articular processes; the 'neck' of the Scotty dog." }, { "term": "Zygapophyseal joint", "definition": "Synovial joint between the articular processes of adjacent vertebrae." }, { "term": "Intervertebral foramen", "definition": "Opening between adjacent vertebrae through which spinal nerves exit." }, { "term": "Sthenic body habitus", "definition": "The average body type, accounting for about half of the population." }, { "term": "Hypersthenic body habitus", "definition": "Large, broad body type with a high, transverse stomach and short, wide thorax." }, { "term": "Ankle mortise", "definition": "The joint space formed by the tibia, fibula and talus, opened on a 15-20 degree internal oblique view." }, { "term": "Scapular Y", "definition": "PA oblique shoulder view in which the scapula forms a 'Y,' used to assess dislocation." }, { "term": "Myelography", "definition": "Fluoroscopic examination of the spinal canal after injecting contrast into the subarachnoid space." }, { "term": "Hysterosalpingography (HSG)", "definition": "Contrast study of the uterus and fallopian tubes, often used to evaluate tubal patency." }, { "term": "Voiding cystourethrogram (VCUG)", "definition": "Fluoroscopic study of the bladder and urethra during urination, often for vesicoureteral reflux." }, { "term": "ERCP", "definition": "Endoscopic retrograde cholangiopancreatography, imaging of the biliary and pancreatic ducts using an endoscope and contrast." }, { "term": "Bone survey", "definition": "Series of radiographs of the skeleton used to look for metastatic disease or non-accidental trauma." } ], "quiz": [ { "q": "For a routine PA chest radiograph, the central ray is directed to the level of:", "options": [ "T3", "T7", "T10", "L1" ], "answer_index": 1, "explanation": "The CR for a PA chest is at T7, which centers the lung fields on the receptor." }, { "q": "A patient cannot stand and free intraperitoneal air is suspected. Which projection is preferred?", "options": [ "AP supine abdomen", "Right lateral decubitus abdomen", "Dorsal decubitus chest", "Left lateral decubitus abdomen" ], "answer_index": 3, "explanation": "In the left lateral decubitus position (right side up), free air rises over the liver, where it is easy to see against the dense organ." }, { "q": "On a correctly positioned PA axial (Caldwell) skull with a 15-degree caudad CR, the petrous ridges should appear:", "options": [ "in the lower third of the orbits", "above the orbits", "below the maxillary sinuses", "within the foramen magnum" ], "answer_index": 0, "explanation": "A 15-degree caudad angle to the OML projects the petrous ridges into the lower third of the orbits." }, { "q": "For an AP axial (Towne) projection, the CR is angled how far caudad to the OML?", "options": [ "15 degrees", "25 degrees", "37 degrees", "30 degrees" ], "answer_index": 3, "explanation": "Towne uses 30 degrees caudad to the OML (37 degrees to the IOML), projecting the dorsum sellae into the foramen magnum." }, { "q": "Which projection best shows the maxillary sinuses free of the petrous ridges?", "options": [ "Lateral skull", "PA axial (Caldwell)", "Parietoacanthial (Waters)", "Submentovertex" ], "answer_index": 2, "explanation": "The Waters projection, with the OML at 37 degrees to the IR, projects the petrous ridges just below the maxillary sinuses." }, { "q": "The cervicothoracic junction (C7-T1) is not shown on a lateral C-spine because the shoulders overlap it. The best follow-up is:", "options": [ "AP open-mouth projection", "PA axial oblique", "AP axial with 30 degrees caudad", "Swimmer's (cervicothoracic) lateral" ], "answer_index": 3, "explanation": "The swimmer's lateral raises one arm and lowers the other shoulder to clear C7-T1." }, { "q": "On a 45-degree oblique lumbar spine, the 'neck' of the Scotty dog represents the:", "options": [ "pedicle", "pars interarticularis", "transverse process", "superior articular process" ], "answer_index": 1, "explanation": "The neck is the pars interarticularis, the site of a spondylolysis defect; the eye is the pedicle and the nose is the transverse process." }, { "q": "For an AP pelvis without suspected trauma, the lower limbs are rotated 15-20 degrees internally in order to:", "options": [ "place the femoral necks parallel to the receptor", "show the lesser trochanters in profile", "open the sacroiliac joints", "reduce gonadal dose" ], "answer_index": 0, "explanation": "Internal rotation offsets femoral anteversion so the femoral necks lie parallel to the IR and appear at full length." }, { "q": "During an upper GI series, which position best fills the pylorus and duodenal bulb with barium?", "options": [ "LPO", "Left lateral", "AP supine", "RAO" ], "answer_index": 3, "explanation": "In the RAO position, gravity moves barium into the pylorus and duodenal bulb; the LPO fills them with air instead." }, { "q": "Which elbow projection shows the radial head and neck free of superimposition with the ulna?", "options": [ "AP partial flexion through the humerus", "Medial (internal) oblique", "Lateral (external) oblique", "Lateral with 90-degree flexion" ], "answer_index": 2, "explanation": "External rotation of about 45 degrees separates the radial head and neck from the ulna; the medial oblique shows the coronoid process." }, { "q": "To best show the scaphoid on a PA wrist, the hand should be placed in:", "options": [ "radial deviation", "full flexion", "ulnar deviation", "lateral rotation" ], "answer_index": 2, "explanation": "Ulnar deviation lengthens the scaphoid and opens the spaces around it, reducing foreshortening." }, { "q": "For an AP mortise projection of the ankle, the leg and foot are rotated:", "options": [ "15-20 degrees internally", "45 degrees externally", "45 degrees internally", "not at all" ], "answer_index": 0, "explanation": "Rotating 15-20 degrees internally places the intermalleolar line parallel to the IR and opens the entire mortise." } ], "bank": [ { "q": "For an AP axial cervical spine, the central ray is directed:", "options": [ "30 degrees cephalad to the mastoid tips", "15-20 degrees caudad to C4", "Perpendicular to C7", "15-20 degrees cephalad to C4 (thyroid cartilage)" ], "answer_index": 3, "explanation": "The cephalad angle lines up with the downward slope of the cervical bodies to open the intervertebral disc spaces.", "subcategory": "Head, Spine and Pelvis Procedures" }, { "q": "An AP axial oblique cervical spine is taken in the LPO position. Which intervertebral foramina are shown?", "options": [ "Both sides equally", "Neither; the zygapophyseal joints are shown instead", "Right-side foramina (farther from the IR)", "Left-side foramina (closer to the IR)" ], "answer_index": 2, "explanation": "Posterior obliques show the foramina on the side away from the IR; anterior obliques show the side closest to it.", "subcategory": "Head, Spine and Pelvis Procedures" }, { "q": "For a lateral thoracic spine, a long exposure time with the patient breathing gently (breathing technique) is used to:", "options": [ "Increase the radiographic contrast", "Reduce the patient's dose", "Raise the shoulders out of the field", "Blur the overlying ribs and lung markings" ], "answer_index": 3, "explanation": "Gentle breathing during a longer exposure blurs ribs and lung detail so the vertebrae show more clearly.", "subcategory": "Head, Spine and Pelvis Procedures" }, { "q": "For a supine AP lumbar spine, the hips and knees are flexed in order to:", "options": [ "Reduce the lumbar lordosis and place the back closer to the table", "Elongate the sacrum", "Raise the diaphragm", "Rotate the pelvis for the obliques" ], "answer_index": 0, "explanation": "Flexing the legs flattens the lumbar curve, which reduces OID and better opens the intervertebral disc spaces.", "subcategory": "Head, Spine and Pelvis Procedures" }, { "q": "Which posterior oblique position, at 25-30 degrees, shows the right sacroiliac joint?", "options": [ "RPO", "RAO", "LPO", "LAO 45 degrees" ], "answer_index": 2, "explanation": "Posterior obliques show the SI joint farther from the IR, so the LPO (right side up) opens the right SI joint.", "subcategory": "Head, Spine and Pelvis Procedures" }, { "q": "For an AP axial projection of the coccyx, the central ray is angled:", "options": [ "10 degrees caudad", "Perpendicular", "15 degrees cephalad", "30 degrees cephalad" ], "answer_index": 0, "explanation": "The coccyx curves forward, so a 10-degree caudad angle is used; the AP axial sacrum uses 15 degrees cephalad.", "subcategory": "Head, Spine and Pelvis Procedures" }, { "q": "Which projection best shows the floors of the orbits when a blowout fracture is suspected?", "options": [ "Lateral facial bones", "AP axial (Towne)", "PA axial (Caldwell) with 15-degree caudad CR", "Modified parietoacanthial (modified Waters)" ], "answer_index": 3, "explanation": "With the OML about 55 degrees to the IR, the petrous ridges project below the orbital rims, showing the orbital floors clearly.", "subcategory": "Head, Spine and Pelvis Procedures" }, { "q": "For an axiolateral oblique mandible, rotating the head 30 degrees toward the IR best shows the mandibular:", "options": [ "Ramus", "Body", "Condyle only", "Mentum (symphysis)" ], "answer_index": 1, "explanation": "A true lateral head position shows the ramus, about 30 degrees of rotation shows the body, and about 45 degrees shows the mentum.", "subcategory": "Head, Spine and Pelvis Procedures" }, { "q": "For the axiolateral oblique (modified Law) projection of the TMJs, the head is rotated 15 degrees toward the IR and the CR is directed:", "options": [ "15 degrees cephalad", "25-30 degrees caudad", "15 degrees caudad", "Perpendicular" ], "answer_index": 2, "explanation": "The modified Law method uses a 15-degree caudad CR to the TMJ nearest the IR, with open- and closed-mouth images.", "subcategory": "Head, Spine and Pelvis Procedures" }, { "q": "For the AP axial inlet projection of the pelvis, the central ray is angled about:", "options": [ "40 degrees cephalad", "40 degrees caudad", "15 degrees cephalad", "Perpendicular to the ASIS" ], "answer_index": 1, "explanation": "The caudad angle projects the pelvic ring as seen from above, showing the inlet for posterior displacement or inward rotation.", "subcategory": "Head, Spine and Pelvis Procedures" }, { "q": "Why is a PA projection generally preferred over AP for a scoliosis series?", "options": [ "It allows a shorter SID", "It removes the need for a lateral view", "It greatly reduces the dose to the breasts and thyroid", "It magnifies the spine for better detail" ], "answer_index": 2, "explanation": "With the X-ray beam entering from the back, radiosensitive anterior tissues receive much less dose, which matters for young patients imaged repeatedly.", "subcategory": "Head, Spine and Pelvis Procedures" }, { "q": "Which hip projection should NOT be done until a fracture has been ruled out?", "options": [ "Axiolateral inferosuperior trauma (Clements-Nakayama)", "Unilateral frog-leg lateral", "AP hip", "Cross-table axiolateral (Danelius-Miller)" ], "answer_index": 1, "explanation": "The frog-leg position abducts and rotates the femur, which can displace a hip fracture; trauma laterals avoid moving the leg.", "subcategory": "Head, Spine and Pelvis Procedures" }, { "q": "Why is a left lateral position preferred over a right lateral for a routine lateral chest?", "options": [ "It shows the right lung better", "It moves the diaphragm higher", "It decreases the needed SID", "The heart is closer to the IR, which reduces cardiac magnification" ], "answer_index": 3, "explanation": "Most of the heart lies left of midline, so a left lateral keeps it closest to the receptor and least magnified.", "subcategory": "Thorax and Abdomen Procedures" }, { "q": "Which projection best shows the lung apices without superimposition of the clavicles?", "options": [ "RAO chest", "Lateral decubitus", "AP axial lordotic", "PA chest on expiration" ], "answer_index": 2, "explanation": "The lordotic position (or a cephalad CR) projects the clavicles above the apices.", "subcategory": "Thorax and Abdomen Procedures" }, { "q": "For ribs above the diaphragm, the exposure is usually made:", "options": [ "During shallow breathing", "On suspended expiration with the patient supine", "On suspended inspiration with the patient erect if possible", "On expiration with the patient prone" ], "answer_index": 2, "explanation": "Deep inspiration and an erect position lower the diaphragm to show the upper ribs; ribs below the diaphragm are done supine on expiration.", "subcategory": "Thorax and Abdomen Procedures" }, { "q": "A patient has pain over the right posterior and axillary ribs. Which oblique best shows the injured area close to the IR?", "options": [ "RAO", "RPO", "Left lateral", "LPO" ], "answer_index": 1, "explanation": "A posterior oblique toward the injured side (RPO for right posterior and axillary ribs) places the area closest to the IR and elongates the axillary ribs.", "subcategory": "Thorax and Abdomen Procedures" }, { "q": "Why is the sternum radiographed in a slight RAO position (about 15-20 degrees)?", "options": [ "To project the sternum over the heart shadow for uniform density", "To project the sternum over the right lung for contrast", "To superimpose it on the spine", "To reduce the dose to the heart" ], "answer_index": 0, "explanation": "The RAO shifts the sternum just left of the spine onto the homogeneous heart shadow, often with breathing technique to blur lung markings.", "subcategory": "Thorax and Abdomen Procedures" }, { "q": "During an esophagram, an RAO of 35-40 degrees is used to place the esophagus:", "options": [ "Over the vertebral column", "Between the vertebral column and the heart", "Over the right lung", "Behind the stomach" ], "answer_index": 1, "explanation": "The RAO separates the esophagus from the spine and shows it against the heart shadow.", "subcategory": "Thorax and Abdomen Procedures" }, { "q": "A small bowel series is generally considered complete when the barium reaches the:", "options": [ "Cecum", "Rectum", "Sigmoid colon", "Duodenojejunal flexure" ], "answer_index": 0, "explanation": "Once contrast passes the ileocecal valve into the cecum, the whole small bowel has been opacified; spot images of the terminal ileum are often taken.", "subcategory": "Thorax and Abdomen Procedures" }, { "q": "For insertion of a barium enema tip, the patient is placed in which position?", "options": [ "Supine Trendelenburg", "Right lateral recumbent with both legs straight", "Prone with the legs apart", "Sims position (left side down, right knee flexed forward)" ], "answer_index": 3, "explanation": "The Sims position relaxes the abdominal muscles and follows the natural course of the rectum for gentle insertion.", "subcategory": "Thorax and Abdomen Procedures" }, { "q": "During a barium enema, which anterior oblique best opens the left colic (splenic) flexure?", "options": [ "LAO", "RPO 15 degrees", "Left lateral", "RAO" ], "answer_index": 0, "explanation": "Anterior obliques open the flexure on the side down, so LAO shows the splenic flexure and RAO the hepatic flexure.", "subcategory": "Thorax and Abdomen Procedures" }, { "q": "In a hypersthenic patient, the stomach tends to lie:", "options": [ "High and vertical along the spine", "High and transverse", "Low and lateral", "Low and vertical" ], "answer_index": 1, "explanation": "A broad, short hypersthenic build places the stomach high and horizontal, so centering is higher than for an average patient.", "subcategory": "Thorax and Abdomen Procedures" }, { "q": "During excretory urography, a 30-degree RPO places which kidney parallel to the IR?", "options": [ "Right kidney", "Left kidney", "Neither; it shows only the bladder", "Both kidneys equally" ], "answer_index": 1, "explanation": "In posterior obliques the kidney on the elevated side is parallel to the IR, so an RPO shows the left kidney best.", "subcategory": "Thorax and Abdomen Procedures" }, { "q": "Why is an erect PA chest included in an acute abdomen series?", "options": [ "It best shows small amounts of free air under the diaphragm", "It replaces the supine abdomen", "It gives the best view of the kidneys", "It shows the bladder outline" ], "answer_index": 0, "explanation": "Free intraperitoneal air rises under the diaphragm, which a horizontal-beam erect chest shows well.", "subcategory": "Thorax and Abdomen Procedures" }, { "q": "On a portable chest X-ray taken to check an endotracheal tube, the tube tip should ideally lie about:", "options": [ "At the level of the carina", "3-5 cm above the carina", "In the right mainstem bronchus", "At the level of the vocal cords" ], "answer_index": 1, "explanation": "About 3-5 cm above the carina allows for head and neck movement without the tube slipping into a mainstem bronchus or the larynx.", "subcategory": "Thorax and Abdomen Procedures" }, { "q": "For an AP thumb, the central ray is directed to the:", "options": [ "Third MCP joint", "First metacarpophalangeal (MCP) joint", "First carpometacarpal (CMC) joint", "Interphalangeal joint of the thumb" ], "answer_index": 1, "explanation": "Centering at the first MCP joint includes the whole thumb, from the distal phalanx to the trapezium.", "subcategory": "Extremity Procedures" }, { "q": "Why is the forearm radiographed AP with the hand supinated rather than PA?", "options": [ "Pronation crosses the radius over the ulna", "PA increases the dose to the hand", "Pronation separates the radius and ulna more", "Supination magnifies the radius" ], "answer_index": 0, "explanation": "In pronation the radius crosses the ulna; supination keeps the two bones parallel.", "subcategory": "Extremity Procedures" }, { "q": "Which finding indicates a correctly positioned lateral wrist?", "options": [ "The radius and ulna are fully separated", "The carpal bones are spread apart", "The scaphoid is elongated", "The distal radius and ulna are superimposed" ], "answer_index": 3, "explanation": "With the elbow flexed 90 degrees and the forearm and humerus in one plane, a true lateral superimposes the distal radius and ulna.", "subcategory": "Extremity Procedures" }, { "q": "On an AP shoulder with the arm in external rotation, which structure is shown in profile laterally?", "options": [ "Coracoid process", "Greater tubercle", "Acromion process", "Lesser tubercle" ], "answer_index": 1, "explanation": "External rotation places the humeral epicondyles parallel to the IR and turns the greater tubercle out to the lateral edge.", "subcategory": "Extremity Procedures" }, { "q": "For the posterior oblique (Grashey) shoulder, the patient is rotated 35-45 degrees toward the affected side to show:", "options": [ "The AC joint without superimposition", "The intertubercular groove", "The glenoid cavity in profile with an open glenohumeral joint space", "The scapula in a true lateral position" ], "answer_index": 2, "explanation": "Rotation places the glenoid fossa parallel to the beam so the joint space appears open.", "subcategory": "Extremity Procedures" }, { "q": "Which shoulder projection is commonly used to assess an anterior or posterior dislocation when the arm cannot be moved?", "options": [ "AP in internal rotation", "Inferosuperior axial (Lawrence) with 90-degree abduction", "PA oblique (scapular Y)", "AP in external rotation" ], "answer_index": 2, "explanation": "The scapular Y needs no arm movement; the humeral head should sit over the center of the Y when the joint is normal.", "subcategory": "Extremity Procedures" }, { "q": "In the inferosuperior axial (Lawrence) shoulder, the arm is abducted about 90 degrees and the horizontal CR is angled:", "options": [ "45 degrees caudad", "Perpendicular to the axilla with no angle", "25-30 degrees laterally", "25-30 degrees medially" ], "answer_index": 3, "explanation": "The medial angle through the axilla shows the humeral head's relation to the glenoid and the coracoid pointing anteriorly.", "subcategory": "Extremity Procedures" }, { "q": "For bilateral AC joint images with weights, why are the weights strapped to the wrists instead of held in the hands?", "options": [ "Strapped weights are heavier", "It makes the 72-inch SID unnecessary", "Holding weights increases the dose to the hands", "Gripping tightens the shoulder muscles and can hide a separation" ], "answer_index": 3, "explanation": "Grasping contracts the shoulder girdle muscles, which can reduce the AC joint and mask a subtle separation.", "subcategory": "Extremity Procedures" }, { "q": "For an AP axial projection of the clavicle, the central ray is typically angled:", "options": [ "15-30 degrees caudad", "15-30 degrees cephalad", "Perpendicular", "45 degrees cephalad" ], "answer_index": 1, "explanation": "The cephalad angle projects the clavicle above the scapula and ribs; thin patients need more angle than broad-shouldered ones.", "subcategory": "Extremity Procedures" }, { "q": "A trauma patient's humerus may be fractured and the arm cannot be rotated. Which projection gives a lateral view of the proximal humerus?", "options": [ "AP in external rotation", "Lateral in internal rotation", "Transthoracic lateral", "Inferosuperior axial with abduction" ], "answer_index": 2, "explanation": "The transthoracic lateral images the proximal humerus through the chest without moving the injured arm.", "subcategory": "Extremity Procedures" }, { "q": "For the trauma axial lateral (Coyle) projection to show the radial head, the elbow is flexed 90 degrees and the CR is angled:", "options": [ "15 degrees toward the wrist", "45 degrees away from the shoulder", "45 degrees toward the shoulder", "Perpendicular to the forearm" ], "answer_index": 2, "explanation": "Angling toward the shoulder projects the radial head away from the ulna; angling away from the shoulder with 80 degrees of flexion shows the coronoid.", "subcategory": "Extremity Procedures" }, { "q": "Which elbow projection shows the coronoid process in profile?", "options": [ "Lateral with 90-degree flexion", "AP lateral (external) oblique", "AP medial (internal) oblique", "AP with partial flexion" ], "answer_index": 2, "explanation": "Internal rotation of about 45 degrees projects the coronoid process away from the radius and shows it in profile.", "subcategory": "Extremity Procedures" }, { "q": "For an AP knee on a patient whose ASIS-to-tabletop measurement is 26 cm, the central ray should be:", "options": [ "Perpendicular", "Angled 10 degrees caudad", "Angled 3-5 degrees caudad", "Angled 3-5 degrees cephalad" ], "answer_index": 3, "explanation": "Above 24 cm calls for 3-5 degrees cephalad, 19-24 cm perpendicular, and under 19 cm 3-5 degrees caudad, to open the joint space.", "subcategory": "Extremity Procedures" }, { "q": "For the PA axial (Camp-Coventry) intercondylar fossa projection with the knee flexed 40 degrees, the CR is directed:", "options": [ "5-7 degrees cephalad", "Perpendicular to the IR", "40 degrees caudad, perpendicular to the lower leg", "40 degrees cephalad" ], "answer_index": 2, "explanation": "The CR matches the 40-degree flexion so it is perpendicular to the tibia, opening the intercondylar fossa.", "subcategory": "Extremity Procedures" }, { "q": "Which tangential patella method needs at least 90 degrees of knee flexion and should be avoided until a fracture is ruled out?", "options": [ "Merchant", "Camp-Coventry", "Holmblad", "Settegast" ], "answer_index": 3, "explanation": "Settegast's acute flexion can displace a fractured patella; Merchant uses about 40 degrees of flexion with the patient supine.", "subcategory": "Extremity Procedures" }, { "q": "Which foot projection best shows the cuboid, the sinus tarsi and the bases of the third to fifth metatarsals?", "options": [ "AP axial with 10-degree CR toward the heel", "AP oblique with 30 degrees lateral rotation", "Lateral (mediolateral)", "AP oblique with 30-40 degrees medial rotation" ], "answer_index": 3, "explanation": "Medial rotation clears the lateral tarsals and metatarsal bases; lateral rotation shows the navicular and first-second intermetatarsal space.", "subcategory": "Extremity Procedures" }, { "q": "For a lateral (mediolateral) ankle, the central ray is directed to the:", "options": [ "Medial malleolus", "Base of the fifth metatarsal", "Lateral malleolus", "Tibial tuberosity" ], "answer_index": 0, "explanation": "Centering at the medial malleolus places the ankle joint at the center of the image.", "subcategory": "Extremity Procedures" }, { "q": "For an adult tibia-fibula exam, the images should:", "options": [ "Include only the joint nearest the injury in all cases", "Include both the knee and ankle joints, using a diagonal or second receptor if needed", "Be done PA to reduce dose", "Show the mid-shaft only, collimated tightly" ], "answer_index": 1, "explanation": "Long bone exams show both joints so fractures and alignment at either end are not missed.", "subcategory": "Extremity Procedures" }, { "q": "For a lateral projection of the paranasal sinuses, the central ray is directed to:", "options": [ "2 inches above the EAM", "Midway between the outer canthus and the EAM", "The nasion", "The acanthion" ], "answer_index": 1, "explanation": "Centering midway between the outer canthus and EAM places the sinuses in the center of the field.", "subcategory": "Head, Spine and Pelvis Procedures" }, { "q": "Which projection shows the sphenoid sinus through the patient's open mouth?", "options": [ "Lateral with closed mouth", "PA axial (Caldwell)", "Parietoacanthial transoral (open-mouth Waters)", "AP axial (Towne)" ], "answer_index": 2, "explanation": "With the mouth open, the sphenoid sinus is projected through the oral cavity on the parietoacanthial projection.", "subcategory": "Head, Spine and Pelvis Procedures" }, { "q": "Which single projection best shows both zygomatic arches at once?", "options": [ "AP axial skull", "PA axial (Caldwell)", "Lateral face", "Submentovertex" ], "answer_index": 3, "explanation": "The SMV projects both arches free of the mandible and skull; exposure is reduced for the thin bone.", "subcategory": "Head, Spine and Pelvis Procedures" }, { "q": "For a lateral projection of the nasal bones, the central ray is directed to a point about:", "options": [ "1/2 inch (1.25 cm) inferior to the nasion", "2 inches superior to the EAM", "At the tip of the nose", "1/2 inch superior to the glabella" ], "answer_index": 0, "explanation": "Centering just below the nasion places the nasal bones at the center of a small, closely collimated field.", "subcategory": "Head, Spine and Pelvis Procedures" }, { "q": "On a correctly positioned parieto-orbital oblique (Rhese) projection, the optic canal appears:", "options": [ "In the upper inner quadrant of the orbit", "In the lower outer quadrant of the orbit", "Within the foramen magnum", "Centered over the petrous ridge" ], "answer_index": 1, "explanation": "With the head in a three-point landing (chin, cheek, nose) and MSP at 53 degrees, the optic canal lands in the lower outer orbit.", "subcategory": "Head, Spine and Pelvis Procedures" }, { "q": "What is the angle difference between the orbitomeatal line (OML) and the infraorbitomeatal line (IOML)?", "options": [ "30 degrees", "8 degrees", "7 degrees", "15 degrees" ], "answer_index": 2, "explanation": "The OML and IOML differ by about 7 degrees, which is why CR angles change by 7 degrees when the other line is used.", "subcategory": "Head, Spine and Pelvis Procedures" }, { "q": "For a lateral skull, the central ray is directed to a point about:", "options": [ "2 inches inferior to the vertex", "At the outer canthus", "1 inch anterior to the EAM", "2 inches (5 cm) superior to the EAM" ], "answer_index": 3, "explanation": "Centering 2 inches above the EAM places the center of the skull in the middle of the field.", "subcategory": "Head, Spine and Pelvis Procedures" }, { "q": "On a correctly angled AP axial (Towne) projection, which structures appear within the foramen magnum?", "options": [ "Dorsum sellae and posterior clinoid processes", "Petrous ridges and mastoid tips", "Mandibular condyles and coronoid processes", "Crista galli and frontal sinus" ], "answer_index": 0, "explanation": "The correct caudal angle projects the dorsum sellae and posterior clinoids into the foramen magnum; too much or too little angle moves them.", "subcategory": "Head, Spine and Pelvis Procedures" }, { "q": "On an AP open-mouth C1-C2 image, the upper incisors overlap the dens. How should the head be adjusted for the repeat?", "options": [ "Angle the CR 15 degrees caudad", "Extend the head slightly, raising the chin", "Rotate the head 15 degrees", "Flex the head slightly, tucking the chin" ], "answer_index": 1, "explanation": "Incisors over the dens mean the head was too flexed; extending it moves the teeth up. If the skull base overlaps the dens, flex instead.", "subcategory": "Head, Spine and Pelvis Procedures" }, { "q": "A trauma patient arrives on a backboard in a cervical collar. What is the usual first radiograph of the cervical spine?", "options": [ "AP open-mouth after removing the collar", "Bilateral obliques with the head turned", "Horizontal-beam (cross-table) lateral without moving the patient", "Flexion and extension laterals" ], "answer_index": 2, "explanation": "A cross-table lateral is taken first, leaving the collar on, to clear the spine before any patient movement.", "subcategory": "Head, Spine and Pelvis Procedures" }, { "q": "To show the thoracic zygapophyseal joints, the body is rotated how far from the plane of the IR?", "options": [ "20 degrees", "45 degrees", "90 degrees", "70 degrees" ], "answer_index": 3, "explanation": "Rotating 70 degrees from the IR (20 degrees from true lateral) opens the thoracic zygapophyseal joints.", "subcategory": "Head, Spine and Pelvis Procedures" }, { "q": "Which projection best shows the lumbar intervertebral foramina?", "options": [ "Lateral", "AP", "AP axial at L5-S1", "45-degree posterior oblique" ], "answer_index": 0, "explanation": "The lumbar intervertebral foramina open on the lateral projection, unlike the cervical foramina, which need obliques.", "subcategory": "Head, Spine and Pelvis Procedures" }, { "q": "An LAO 45-degree lumbar spine oblique demonstrates which zygapophyseal joints?", "options": [ "Both sides equally", "Right (upside) joints", "No joints; it shows the foramina", "Left (downside) joints" ], "answer_index": 1, "explanation": "Anterior obliques show the joints farther from the IR, so LAO shows the right side; posterior obliques show the side closer to the IR.", "subcategory": "Head, Spine and Pelvis Procedures" }, { "q": "In a scoliosis series, right and left bending AP projections are taken mainly to:", "options": [ "Rule out spinal fracture", "Show the intervertebral foramina", "Assess how flexible the curve is", "Measure leg length differences" ], "answer_index": 2, "explanation": "Bending views show how much the curve corrects with movement, which helps plan bracing or surgery.", "subcategory": "Head, Spine and Pelvis Procedures" }, { "q": "For an AP axial projection of the sacrum, the central ray is usually angled:", "options": [ "30 degrees cephalad", "25 degrees caudad", "10 degrees caudad", "15 degrees cephalad" ], "answer_index": 3, "explanation": "A 15-degree cephalic angle opens the sacrum and reduces foreshortening from its natural tilt.", "subcategory": "Head, Spine and Pelvis Procedures" }, { "q": "The femoral neck can be located by finding the midpoint of a line between which two landmarks, then moving distally on a perpendicular?", "options": [ "ASIS and symphysis pubis", "ASIS and greater trochanter", "Iliac crest and greater trochanter", "Ischial tuberosity and iliac crest" ], "answer_index": 0, "explanation": "The neck lies about 2.5 inches distal to the midpoint of a line joining the ASIS and the symphysis pubis.", "subcategory": "Head, Spine and Pelvis Procedures" }, { "q": "For a lateral cervical spine, the exposure is made at the end of:", "options": [ "A Valsalva maneuver, to widen disc spaces", "Full expiration, to help lower the shoulders", "Shallow breathing, to blur the shoulders", "Full inspiration, to raise the shoulders" ], "answer_index": 1, "explanation": "Expiration lets the shoulders drop, helping show C7; arm weights may also be used.", "subcategory": "Head, Spine and Pelvis Procedures" }, { "q": "After head trauma, a horizontal-beam lateral skull may show an air-fluid level in the sphenoid sinus. This can indicate a:", "options": [ "Mandibular dislocation", "Nasal bone fracture", "Basal skull fracture", "Chronic sinusitis only" ], "answer_index": 2, "explanation": "Blood or CSF in the sphenoid sinus (sphenoid effusion) seen with a horizontal beam may be the only sign of a basal skull fracture.", "subcategory": "Head, Spine and Pelvis Procedures" }, { "q": "On a well-inspired PA chest, at least how many posterior ribs should be seen above the diaphragm?", "options": [ "8", "12", "7", "10" ], "answer_index": 3, "explanation": "Seeing 10 posterior ribs above the diaphragm, or 11 in many patients, confirms full inspiration.", "subcategory": "Thorax and Abdomen Procedures" }, { "q": "For a lateral chest, why are the patient's arms raised above the head?", "options": [ "To keep arm soft tissue off the upper lungs", "To lower the diaphragm", "To reduce rotation of the heart", "To roll the scapulae off the lung fields" ], "answer_index": 0, "explanation": "Raised arms keep the humeri and their soft tissue from superimposing the upper lung fields.", "subcategory": "Thorax and Abdomen Procedures" }, { "q": "For a PA chest, why are the shoulders rolled forward?", "options": [ "To elevate the clavicles above the apices", "To move the scapulae out of the lung fields", "To reduce heart magnification", "To flatten the diaphragm" ], "answer_index": 1, "explanation": "Rotating the shoulders forward moves the scapulae laterally, clear of the lungs.", "subcategory": "Thorax and Abdomen Procedures" }, { "q": "A small pneumothorax is suspected but not seen on the inspiration PA chest. Which added image is most useful?", "options": [ "AP lordotic on inspiration", "Left lateral decubitus with fluid down", "PA chest on full expiration", "Lateral chest with arms down" ], "answer_index": 2, "explanation": "On expiration lung volume falls while the free air stays, making a small pneumothorax easier to see.", "subcategory": "Thorax and Abdomen Procedures" }, { "q": "A patient who cannot sit up may have a left pneumothorax. Which decubitus position is correct?", "options": [ "Dorsal decubitus, left side up", "Ventral decubitus, left side down", "Left lateral decubitus, left side down", "Right lateral decubitus, left side up" ], "answer_index": 3, "explanation": "Free air rises, so the affected side is placed up; for fluid, the affected side goes down.", "subcategory": "Thorax and Abdomen Procedures" }, { "q": "On a supine AP mobile chest, the heart appears larger than on an erect PA chest mainly because of:", "options": [ "Greater OID and shorter SID", "Higher kVp and a grid", "Less OID and longer SID", "Full inspiration and erect position" ], "answer_index": 0, "explanation": "In AP the heart is farther from the IR, and mobile exams often use a shorter SID, both of which magnify the heart.", "subcategory": "Thorax and Abdomen Procedures" }, { "q": "During a double-contrast upper GI, which position fills the fundus with barium while the body and antrum are air-filled?", "options": [ "RAO", "LPO", "Right lateral", "PA prone" ], "answer_index": 1, "explanation": "In the LPO, barium pools in the posterior fundus and air rises into the body, pylorus and duodenal bulb.", "subcategory": "Thorax and Abdomen Procedures" }, { "q": "Which upper GI projection best shows the retrogastric space?", "options": [ "PA prone", "LPO", "Right lateral", "AP supine" ], "answer_index": 2, "explanation": "The right lateral shows the stomach and duodenal loop in profile, including the space behind the stomach.", "subcategory": "Thorax and Abdomen Procedures" }, { "q": "For a PA projection of the stomach on a hypersthenic patient, the CR may be angled 35-45 degrees cephalad to:", "options": [ "Project the duodenum off the spine", "Reduce the dose to the thyroid", "Shorten the exposure time", "Open the greater and lesser curvatures" ], "answer_index": 3, "explanation": "A high, horizontal stomach is foreshortened on a plain PA, so a cephalic angle opens its curvatures.", "subcategory": "Thorax and Abdomen Procedures" }, { "q": "During a barium enema, the enema bag should hang no higher than about how far above the table?", "options": [ "24 inches (60 cm)", "48 inches (120 cm)", "72 inches (180 cm)", "12 inches (30 cm)" ], "answer_index": 0, "explanation": "Keeping the bag at or below 24 inches limits flow pressure and lowers the risk of bowel injury.", "subcategory": "Thorax and Abdomen Procedures" }, { "q": "During a barium enema, which projection best shows the rectum and rectosigmoid in profile?", "options": [ "LAO 40 degrees", "Lateral rectum", "PA axial", "AP supine" ], "answer_index": 1, "explanation": "A lateral rectum shows the rectum and rectosigmoid in profile, including the presacral space.", "subcategory": "Thorax and Abdomen Procedures" }, { "q": "Why is the prone PA projection usually preferred over AP for a small bowel series?", "options": [ "It speeds the barium transit time", "It lowers gonadal dose in all patients", "Compression helps separate the bowel loops", "It moves the stomach above the diaphragm" ], "answer_index": 2, "explanation": "Lying prone compresses the abdomen, spreading the loops apart and placing them closer to the IR.", "subcategory": "Thorax and Abdomen Procedures" }, { "q": "During an excretory urogram, ureteric compression should NOT be used for a patient with a known:", "options": [ "History of hypertension", "Single small renal cyst", "Mild contrast hives history", "Abdominal aortic aneurysm" ], "answer_index": 3, "explanation": "Compression is contraindicated with an aneurysm, ureteral stones, recent abdominal surgery, trauma or severe abdominal pain.", "subcategory": "Thorax and Abdomen Procedures" }, { "q": "What is the main purpose of the post-void image at the end of an excretory urogram?", "options": [ "To show residual urine and bladder abnormalities", "To check for contrast reaction", "To show the renal parenchyma in the nephrogram phase", "To show the renal pelvis filling" ], "answer_index": 0, "explanation": "After voiding, retained urine may suggest an enlarged prostate or bladder problem, and small tumors may be seen.", "subcategory": "Thorax and Abdomen Procedures" }, { "q": "During a voiding cystourethrogram on a male, which position shows the urethra?", "options": [ "AP supine", "30-degree RPO", "Prone PA", "45-degree LAO" ], "answer_index": 1, "explanation": "A 30-degree RPO puts the male urethra over the soft tissue of the right thigh, clear of the pelvis.", "subcategory": "Thorax and Abdomen Procedures" }, { "q": "Which urinary study is NOT a functional study of the kidneys?", "options": [ "IV pyelogram with nephrogram", "Excretory urogram", "Retrograde pyelogram", "Excretory urogram with delayed images" ], "answer_index": 2, "explanation": "In a retrograde study, contrast is put in through a ureteral catheter, so kidney function is not shown.", "subcategory": "Thorax and Abdomen Procedures" }, { "q": "For an acute abdomen series, why does the patient stay erect or in decubitus for several minutes before the exposure?", "options": [ "To reduce motion from peristalsis", "To let barium reach the colon", "To allow the diaphragm to drop", "To allow free air to rise and collect" ], "answer_index": 3, "explanation": "Waiting at least 5 minutes (10-20 is better) lets small amounts of free air rise so they can be seen.", "subcategory": "Thorax and Abdomen Procedures" }, { "q": "During an esophagram, which maneuver can be used to try to show gastroesophageal reflux?", "options": [ "Water test, swallowing water while lying supine", "Standing erect with normal quiet breathing", "Glucagon injection before the exam", "Upright PA with arms raised" ], "answer_index": 0, "explanation": "Reflux-provoking methods include the water test, breathing exercises such as Valsalva, compression and the toe-touch maneuver.", "subcategory": "Thorax and Abdomen Procedures" }, { "q": "A lateral soft tissue neck for upper airway evaluation is exposed:", "options": [ "After a Valsalva maneuver", "During a slow, deep inspiration", "During rapid shallow breathing", "On full expiration" ], "answer_index": 1, "explanation": "Slow deep inspiration fills the larynx and upper trachea with air to show the airway.", "subcategory": "Thorax and Abdomen Procedures" }, { "q": "On a normal PA chest, the right hemidiaphragm usually lies slightly higher than the left because of the:", "options": [ "Heart beneath it", "Stomach gas bubble", "Liver beneath it", "Shorter right lung" ], "answer_index": 2, "explanation": "The liver lifts the right hemidiaphragm; the gastric air bubble lies under the left.", "subcategory": "Thorax and Abdomen Procedures" }, { "q": "For a PA projection of the third finger, the central ray is directed to the:", "options": [ "Head of the third metacarpal", "Metacarpophalangeal joint", "Distal interphalangeal joint", "Proximal interphalangeal joint" ], "answer_index": 3, "explanation": "For a single finger the CR centers on the PIP joint, mid-finger.", "subcategory": "Extremity Procedures" }, { "q": "For a PA oblique projection of the hand, the hand is rotated:", "options": [ "45 degrees laterally (externally)", "45 degrees medially (internally)", "15 degrees laterally", "90 degrees laterally" ], "answer_index": 0, "explanation": "A 45-degree lateral rotation with fingers spread and parallel to the IR shows the metacarpals and phalanges obliquely.", "subcategory": "Extremity Procedures" }, { "q": "What is the main reason for a 'fan' lateral of the hand?", "options": [ "To superimpose the metacarpals", "To separate the digits so the phalanges can be seen", "To show the carpal canal", "To show the thumb in AP" ], "answer_index": 1, "explanation": "Spreading the fingers in a fan avoids superimposing the phalanges on a lateral hand.", "subcategory": "Extremity Procedures" }, { "q": "A PA wrist with radial deviation best opens the spaces around which carpals?", "options": [ "Only the distal radius", "The first carpometacarpal joint", "Medial (ulnar) side carpals", "Scaphoid and trapezium" ], "answer_index": 2, "explanation": "Turning the hand toward the radius opens the ulnar side, showing the hamate, pisiform, triquetrum and lunate.", "subcategory": "Extremity Procedures" }, { "q": "Which carpals are best shown on a PA oblique wrist with 45-degree lateral rotation?", "options": [ "Pisiform and hamate", "Capitate and hamate hook", "Lunate and triquetrum", "Trapezium and scaphoid" ], "answer_index": 3, "explanation": "Rotating the hand laterally opens the lateral carpals, especially the trapezium and scaphoid.", "subcategory": "Extremity Procedures" }, { "q": "On a correctly positioned lateral forearm, the radial head should:", "options": [ "Superimpose the coronoid process", "Lie completely free of the ulna", "Appear on the medial side of the elbow", "Superimpose the olecranon process" ], "answer_index": 0, "explanation": "With the elbow flexed 90 degrees and the hand lateral, the radial head overlaps the coronoid and the distal radius and ulna overlap.", "subcategory": "Extremity Procedures" }, { "q": "On a lateral elbow flexed 90 degrees, a visible posterior fat pad most likely suggests:", "options": [ "Incorrect rotation of the forearm", "Joint effusion, possibly from an occult fracture", "Overexposure of soft tissue", "Normal anatomy in every patient" ], "answer_index": 1, "explanation": "The posterior fat pad is normally hidden in the olecranon fossa; seeing it suggests fluid in the joint.", "subcategory": "Extremity Procedures" }, { "q": "A patient cannot fully extend the elbow for an AP. What is the usual approach?", "options": [ "A lateral only, since AP is impossible", "A single PA with the patient prone", "Two APs: one with the humerus parallel, one with the forearm parallel", "One AP with the CR angled 45 degrees" ], "answer_index": 2, "explanation": "Each AP keeps one long bone parallel to the IR so the distal humerus and proximal forearm are each shown without distortion.", "subcategory": "Extremity Procedures" }, { "q": "For an acute flexion (Jones method) elbow with the CR perpendicular to the humerus, which area is best shown?", "options": [ "Proximal radius and ulna", "Radial tuberosity in profile", "Mid-shaft of the humerus", "Distal humerus and olecranon" ], "answer_index": 3, "explanation": "With the CR perpendicular to the humerus the distal humerus is shown; perpendicular to the forearm shows the proximal forearm.", "subcategory": "Extremity Procedures" }, { "q": "For an AP projection of the humerus, the epicondyles are positioned:", "options": [ "Parallel to the IR", "At 20 degrees to the IR", "Perpendicular to the IR", "At 45 degrees to the IR" ], "answer_index": 0, "explanation": "Parallel epicondyles give a true AP humerus with the arm in external rotation; perpendicular epicondyles give a lateral.", "subcategory": "Extremity Procedures" }, { "q": "For an AP scapula, the arm is abducted 90 degrees in order to:", "options": [ "Show the acromioclavicular joint in profile", "Move the scapula laterally, off the ribs", "Superimpose the scapula over the lung", "Place the greater tubercle in profile" ], "answer_index": 1, "explanation": "Abduction pulls the scapula laterally so more of its body is seen clear of the thoracic cage.", "subcategory": "Extremity Procedures" }, { "q": "The supraspinatus outlet (Neer) projection is a scapular Y position with the central ray angled:", "options": [ "No angle at all", "45 degrees caudad", "10-15 degrees caudad", "25 degrees cephalad" ], "answer_index": 2, "explanation": "A slight caudal angle shows the outlet under the acromion, used to assess impingement.", "subcategory": "Extremity Procedures" }, { "q": "Bilateral AC joints are usually taken erect at 72 inches (180 cm) SID in order to:", "options": [ "Allow the patient to hold weights", "Avoid the need for a side marker", "Increase the receptor exposure", "Reduce magnification and include both joints on one IR" ], "answer_index": 3, "explanation": "A longer SID reduces magnification and beam divergence, helping include both AC joints for comparison.", "subcategory": "Extremity Procedures" }, { "q": "On a correctly positioned lateral ankle, the distal fibula appears:", "options": [ "Over the posterior half of the tibia", "Completely free of the tibia", "Over the anterior tibia", "Medial to the tibia" ], "answer_index": 0, "explanation": "In a true lateral the fibula overlaps the posterior tibia and the talar domes superimpose.", "subcategory": "Extremity Procedures" }, { "q": "Why are lateral feet often done weight-bearing (standing)?", "options": [ "To show the sinus tarsi", "To show the longitudinal arches under load", "To reduce the dose to the foot", "To separate the metatarsals" ], "answer_index": 1, "explanation": "Standing shows how the arches hold up under body weight, which is useful for flat feet.", "subcategory": "Extremity Procedures" }, { "q": "On a true AP ankle, which part of the ankle mortise is normally NOT open?", "options": [ "The medial side between talus and medial malleolus", "The superior tibiotalar space", "The lateral side, where the fibula overlaps the talus", "The entire mortise is open" ], "answer_index": 2, "explanation": "A true AP shows the medial joint space open; the 15-20 degree mortise view is needed to open the whole joint.", "subcategory": "Extremity Procedures" }, { "q": "A 45-degree medial oblique ankle best shows the:", "options": [ "Medial malleolus in profile", "Calcaneus in lateral profile", "Sinus tarsi", "Distal tibiofibular joint" ], "answer_index": 3, "explanation": "Rotating the foot 45 degrees medially opens the distal tibiofibular joint and the lateral mortise.", "subcategory": "Extremity Procedures" }, { "q": "AP inversion and eversion stress views of the ankle are done to:", "options": [ "Show ligament injury by widening of the joint space", "Detect a fracture of the calcaneus", "Separate the metatarsal bases", "Show the longitudinal arch" ], "answer_index": 0, "explanation": "Stress is applied, often by the physician, and widening or tilting of the mortise suggests a torn ligament.", "subcategory": "Extremity Procedures" }, { "q": "Which knee projection best shows the proximal tibiofibular joint open?", "options": [ "Tangential (sunrise) patella", "AP oblique with 45-degree medial rotation", "Lateral with 20 degrees of flexion", "AP oblique with 45-degree lateral rotation" ], "answer_index": 1, "explanation": "Medial rotation shows the lateral condyles and opens the proximal tibiofibular articulation.", "subcategory": "Extremity Procedures" }, { "q": "An AP oblique knee in 45-degree lateral rotation shows which of the following?", "options": [ "The patella free of the femur", "Lateral condyles, with the tibiofibular joint open", "Medial condyles, with the fibula over the tibia", "The intercondylar fossa" ], "answer_index": 2, "explanation": "Lateral rotation puts the fibula behind the tibia and shows the medial femoral and tibial condyles.", "subcategory": "Extremity Procedures" }, { "q": "Bilateral standing AP knees are ordered for a patient with arthritis mainly to:", "options": [ "Show the intercondylar fossa", "Show the patellofemoral joint", "Reduce the dose compared with supine views", "Show joint space narrowing under weight" ], "answer_index": 3, "explanation": "Weight-bearing shows the true femorotibial joint spaces, which can look normal when the patient lies down.", "subcategory": "Extremity Procedures" }, { "q": "For the Merchant (bilateral tangential) patella method, the knees are flexed about 40 degrees and the CR is angled:", "options": [ "30 degrees caudad from horizontal", "Perpendicular to the IR", "15 degrees caudad from vertical", "45 degrees cephalad from vertical" ], "answer_index": 0, "explanation": "The Merchant method uses a 30-degree caudal angle from horizontal to show both patellofemoral joints.", "subcategory": "Extremity Procedures" }, { "q": "For an AP femur, the leg is rotated about 5 degrees internally to:", "options": [ "Open the patellofemoral joint", "Place the femur in a true AP position", "Show the lesser trochanter in profile", "Lower the dose to the gonads" ], "answer_index": 1, "explanation": "Slight internal rotation offsets the natural anteversion of the femoral neck so the femur is in a true AP.", "subcategory": "Extremity Procedures" }, { "q": "For a mediolateral calcaneus, the central ray is directed to a point about:", "options": [ "2 inches above the medial malleolus", "At the lateral malleolus", "1 inch (2.5 cm) distal to the medial malleolus", "At the base of the fifth metatarsal" ], "answer_index": 2, "explanation": "Centering 1 inch below the medial malleolus places the calcaneus and subtalar joint in the middle of the field.", "subcategory": "Extremity Procedures" }, { "q": "An AP thumb is usually preferred over a PA thumb because the AP:", "options": [ "Is easier for patients with wrist injury", "Requires no internal rotation", "Shows the thumb in lateral profile", "Gives less OID and so less magnification" ], "answer_index": 3, "explanation": "In AP the thumb lies on the IR; in PA it is raised, which increases OID and blur.", "subcategory": "Extremity Procedures" }, { "q": "A lateral hand in extension is most useful for showing:", "options": [ "Foreign bodies and fracture fragment displacement", "Bone age", "Each phalanx separately", "The carpal canal" ], "answer_index": 0, "explanation": "The extended lateral shows anterior or posterior displacement of fractures and helps locate foreign bodies.", "subcategory": "Extremity Procedures" }, { "q": "In a Colles fracture of the distal radius, the distal fragment is usually displaced:", "options": [ "Anteriorly (volar)", "Posteriorly (dorsally)", "Not displaced at all", "Medially only" ], "answer_index": 1, "explanation": "A Colles fracture is a fall on an outstretched hand with posterior displacement, best seen on the lateral wrist; anterior displacement suggests a Smith fracture.", "subcategory": "Extremity Procedures" }, { "q": "For a pediatric bone age study, which image is usually taken?", "options": [ "PA of both hands and both feet", "Lateral of the right foot", "PA of the left hand and wrist", "AP of both knees" ], "answer_index": 2, "explanation": "Bone age is usually judged on a single PA of the left hand and wrist, compared with standard reference images.", "subcategory": "Extremity Procedures" } ] } ], "body_regions": [ { "region": "head", "label": "Head / Skull", "common_exams": [ "Skull series (AP axial Towne, lateral, PA axial Caldwell, PA)", "Facial bones (Waters, Caldwell, lateral)", "Paranasal sinuses (erect, horizontal beam)", "Mandible and TMJs", "Nasal bones", "Orbits" ], "image": { "url": "https://upload.wikimedia.org/wikipedia/commons/b/bd/X-ray_of_the_human_skull_%28side_view%29.jpg", "caption": "Lateral radiograph of the skull and cervical region.", "credit": "Nyechologist", "license": "CC BY 3.0", "page_url": "https://commons.wikimedia.org/wiki/File:X-ray_of_the_human_skull_(side_view).jpg" }, "questions": [ { "q": "For a lateral skull projection, which line is placed perpendicular to the image receptor?", "options": [ "Orbitomeatal line", "Midsagittal plane", "Infraorbitomeatal line", "Interpupillary line" ], "answer_index": 3, "explanation": "The interpupillary line is perpendicular and the midsagittal plane parallel to the IR, which prevents tilt and rotation." }, { "q": "Why must paranasal sinus projections be performed erect with a horizontal beam?", "options": [ "To reduce patient dose", "To show air-fluid levels", "To magnify the sinuses", "To remove the petrous ridges" ], "answer_index": 1, "explanation": "Fluid layers only with a horizontal beam and an upright patient, so air-fluid levels can be seen." }, { "q": "The submentovertex (full basal) projection requires which line to be parallel to the image receptor?", "options": [ "Mentomeatal line", "Orbitomeatal line", "Glabellomeatal line", "Infraorbitomeatal line" ], "answer_index": 3, "explanation": "For the SMV the IOML is parallel to the IR and the CR is perpendicular to the IOML." } ] }, { "region": "chest", "label": "Chest / Thorax", "common_exams": [ "PA and lateral chest", "AP supine or semi-erect chest (portable)", "Lateral decubitus chest", "AP lordotic", "Ribs above and below the diaphragm", "Sternum (RAO, lateral)", "Soft tissue neck" ], "image": { "url": "https://upload.wikimedia.org/wikipedia/commons/thumb/a/a1/Normal_posteroanterior_%28PA%29_chest_radiograph_%28X-ray%29.jpg/960px-Normal_posteroanterior_%28PA%29_chest_radiograph_%28X-ray%29.jpg", "caption": "Normal posteroanterior (PA) chest radiograph.", "credit": "Mikael Häggström", "license": "CC0 1.0 (public domain dedication)", "page_url": "https://commons.wikimedia.org/wiki/File:Normal_posteroanterior_(PA)_chest_radiograph_(X-ray).jpg" }, "questions": [ { "q": "Why is the PA chest performed at a 72-inch (180 cm) SID?", "options": [ "To minimize magnification of the heart", "To increase patient dose to the lungs", "To increase OID", "To allow use of a smaller focal spot" ], "answer_index": 0, "explanation": "A long SID reduces magnification and distortion of the heart and mediastinum." }, { "q": "Which radiographic sign shows rotation on a PA chest?", "options": [ "Scapulae projected outside the lung fields", "Ten posterior ribs above the diaphragm", "Unequal distances from the medial ends of the clavicles to the spinous processes", "Visible costophrenic angles" ], "answer_index": 2, "explanation": "With no rotation, the sternal ends of the clavicles are equidistant from the spine; unequal distances indicate rotation." }, { "q": "A patient may have fluid in the right pleural space and cannot stand. Which projection best shows the fluid?", "options": [ "Left lateral decubitus", "AP lordotic", "Dorsal decubitus abdomen", "Right lateral decubitus" ], "answer_index": 3, "explanation": "For pleural fluid, the affected side goes down, so a right lateral decubitus lets fluid layer along the dependent chest wall." } ] }, { "region": "abdomen", "label": "Abdomen", "common_exams": [ "AP supine abdomen (KUB)", "AP upright abdomen", "Left lateral decubitus abdomen", "Acute abdomen series", "Upper GI and small bowel series", "Contrast enema", "Cystography and retrograde urography", "ERCP and surgical cholangiography" ], "image": { "url": "https://upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Medical_X-Ray_imaging_ABH02_nevit.jpg/960px-Medical_X-Ray_imaging_ABH02_nevit.jpg", "caption": "AP supine abdominal radiograph (KUB) showing bowel gas, lumbar spine and pelvis.", "credit": "Nevit Dilmen", "license": "CC BY-SA 3.0", "page_url": "https://commons.wikimedia.org/wiki/File:Medical_X-Ray_imaging_ABH02_nevit.jpg" }, "questions": [ { "q": "For an AP supine abdomen (KUB), the central ray is directed to the level of the:", "options": [ "xiphoid process", "iliac crests", "ASIS", "symphysis pubis" ], "answer_index": 1, "explanation": "Centering at the iliac crests (about L4-L5) includes the kidneys through the symphysis pubis on most patients." }, { "q": "When is the abdomen exposure taken, relative to breathing?", "options": [ "On suspended expiration", "On full inspiration", "During quiet breathing", "On a Valsalva maneuver" ], "answer_index": 0, "explanation": "Expiration raises the diaphragm and lets the abdominal organs spread out without compression, giving a better view." }, { "q": "For a hypersthenic patient, how might the routine AP abdomen need to be adapted?", "options": [ "Use one receptor placed lengthwise", "Center 2 inches below the symphysis", "Increase SID to 72 inches", "Use two receptors placed crosswise to cover the whole abdomen" ], "answer_index": 3, "explanation": "A broad abdomen may not fit on one lengthwise receptor, so two crosswise images are often needed to include all the anatomy." } ] }, { "region": "pelvis", "label": "Pelvis & Hips", "common_exams": [ "AP pelvis", "AP hip", "Unilateral and bilateral frog-leg (non-trauma)", "Cross-table axiolateral hip (Danelius-Miller)", "Inlet and outlet projections", "Judet (acetabulum) obliques", "Sacroiliac joints", "Hysterosalpingography" ], "image": { "url": "https://upload.wikimedia.org/wikipedia/commons/thumb/2/2f/X-ray_of_the_pelvis_of_an_18_year_old_male_-_case_2_-_anteroposterior.jpg/960px-X-ray_of_the_pelvis_of_an_18_year_old_male_-_case_2_-_anteroposterior.jpg", "caption": "Normal AP pelvis radiograph of a young adult male.", "credit": "Staff at the Department of Radiology, UC San Diego Health", "license": "Public domain", "page_url": "https://commons.wikimedia.org/wiki/File:X-ray_of_the_pelvis_of_an_18_year_old_male_-_case_2_-_anteroposterior.jpg" }, "questions": [ { "q": "A trauma patient arrives with a shortened, externally rotated leg. Which lateral hip projection is appropriate?", "options": [ "Unilateral frog-leg (modified Cleaves)", "Bilateral frog-leg", "Cross-table axiolateral (Danelius-Miller)", "PA oblique" ], "answer_index": 2, "explanation": "Frog-leg views require moving the leg and are contraindicated with suspected fracture; the cross-table axiolateral leaves the affected leg in place." }, { "q": "On an AP pelvis with correct 15-20 degree internal rotation, the lesser trochanters should appear:", "options": [ "very prominent on both sides", "superimposed on the femoral heads", "absent or only slightly visible", "projected above the iliac crests" ], "answer_index": 2, "explanation": "Internal rotation turns the lesser trochanters posteriorly, so they are barely visible or hidden; a prominent lesser trochanter suggests external rotation." }, { "q": "For the AP axial outlet projection of the pelvis in a male patient, the CR is angled:", "options": [ "20-35 degrees cephalad", "40 degrees caudad", "15 degrees caudad", "perpendicular to the IR" ], "answer_index": 0, "explanation": "The outlet view uses a cephalad angle (about 20-35 degrees for males, 30-45 for females) to show the pubic and ischial rami." } ] }, { "region": "spine", "label": "Spine", "common_exams": [ "Cervical spine (AP axial, open-mouth, lateral, obliques, swimmer's)", "Thoracic spine (AP, lateral)", "Lumbar spine (AP, lateral, obliques, L5-S1 spot)", "Sacrum and coccyx", "Scoliosis series", "Flexion and extension laterals", "Myelography" ], "image": { "url": "https://upload.wikimedia.org/wikipedia/commons/thumb/e/e0/X-ray_of_the_cervical_spine_of_a_20_year_old_male_-_lateral.jpg/960px-X-ray_of_the_cervical_spine_of_a_20_year_old_male_-_lateral.jpg", "caption": "Normal lateral cervical spine radiograph of a young adult male.", "credit": "Staff at the Department of Radiology, UC San Diego Health", "license": "Public domain", "page_url": "https://commons.wikimedia.org/wiki/File:X-ray_of_the_cervical_spine_of_a_20_year_old_male_-_lateral.jpg" }, "questions": [ { "q": "Why is the lateral cervical spine taken at a 60-72 inch SID?", "options": [ "To eliminate the need for collimation", "To reduce exposure time", "To include the lumbar spine", "To compensate for the increased OID and reduce magnification" ], "answer_index": 3, "explanation": "The shoulders force a large OID; a longer SID offsets the resulting magnification and blur." }, { "q": "For an AP open-mouth projection of C1-C2, which two landmarks are aligned perpendicular to the receptor?", "options": [ "Glabella and mentum", "Lower edge of the upper incisors and base of the skull (mastoid tips)", "Acanthion and EAM", "Nasion and inion" ], "answer_index": 1, "explanation": "Aligning the lower margin of the upper incisors with the mastoid tips (skull base) clears the dens and C1-C2 from overlying teeth and skull." }, { "q": "Which projection best shows the L5-S1 zygapophyseal joint?", "options": [ "45-degree posterior oblique", "Lateral with 15-degree caudad angle", "AP with 30-degree cephalad angle", "30-degree posterior oblique" ], "answer_index": 3, "explanation": "The L5-S1 zygapophyseal joint lies at a smaller angle, so about a 30-degree oblique shows it best; L1-L4 use 45 degrees." } ] }, { "region": "upper_extremity", "label": "Upper Extremity", "common_exams": [ "Fingers and thumb", "Hand (PA, oblique, lateral)", "Wrist (PA, oblique, lateral, ulnar deviation, Gaynor-Hart)", "Forearm", "Elbow (AP, lateral, obliques, Coyle)", "Humerus", "Shoulder (internal and external rotation, Grashey, scapular Y)", "Clavicle and AC joints" ], "image": { "url": "https://upload.wikimedia.org/wikipedia/commons/thumb/e/e2/X-ray_of_normal_hand_by_dorsoplantar_projection.jpg/960px-X-ray_of_normal_hand_by_dorsoplantar_projection.jpg", "caption": "Normal PA (dorsopalmar) radiograph of an adult left hand and wrist.", "credit": "Mikael Häggström, M.D.", "license": "CC0 1.0 (public domain dedication)", "page_url": "https://commons.wikimedia.org/wiki/File:X-ray_of_normal_hand_by_dorsoplantar_projection.jpg" }, "questions": [ { "q": "For a PA hand, where is the central ray directed?", "options": [ "To the third metacarpophalangeal (MCP) joint", "To the second proximal interphalangeal joint", "To the midcarpal area", "To the radial styloid" ], "answer_index": 0, "explanation": "The CR enters at the third MCP joint, centering the hand from fingertips to distal radius and ulna." }, { "q": "On a true lateral elbow, the elbow is flexed 90 degrees and the humeral epicondyles are:", "options": [ "parallel to the IR", "rotated 45 degrees medially", "perpendicular to the IR", "rotated 45 degrees laterally" ], "answer_index": 2, "explanation": "Epicondyles perpendicular to the IR, with 90-degree flexion, superimpose them and show the fat pads and olecranon process in profile." }, { "q": "Which tangential projection shows the carpal canal (carpal tunnel)?", "options": [ "Stecher", "Norgaard", "Coyle", "Gaynor-Hart" ], "answer_index": 3, "explanation": "The Gaynor-Hart method angles the CR about 25-30 degrees to the long axis of the hand to show the carpal canal." } ] }, { "region": "lower_extremity", "label": "Lower Extremity", "common_exams": [ "Toes and sesamoids", "Foot (AP axial, oblique, lateral, weight-bearing)", "Calcaneus (lateral, plantodorsal axial)", "Ankle (AP, mortise, lateral, stress)", "Tibia/fibula", "Knee (AP, lateral, obliques, intercondylar fossa)", "Patella (PA, Merchant, Settegast)", "Femur and long bone measurement" ], "image": { "url": "https://upload.wikimedia.org/wikipedia/commons/c/c7/X-ray_of_normal_ankle_-_frontal.jpg", "caption": "Normal frontal (AP) radiograph of an adult ankle.", "credit": "Mikael Häggström", "license": "CC0 1.0 (public domain dedication)", "page_url": "https://commons.wikimedia.org/wiki/File:X-ray_of_normal_ankle_-_frontal.jpg" }, "questions": [ { "q": "For an AP foot, the central ray is angled 10 degrees toward the:", "options": [ "toes", "heel", "medial malleolus", "lateral malleolus" ], "answer_index": 1, "explanation": "Angling 10 degrees posteriorly (toward the heel) places the CR perpendicular to the metatarsals and opens the tarsometatarsal joints." }, { "q": "For a plantodorsal axial calcaneus, the CR is angled about 40 degrees cephalad to the:", "options": [ "long axis of the foot", "tibial plateau", "plantar surface of the heel", "long axis of the tibia" ], "answer_index": 0, "explanation": "The 40-degree cephalad angle to the long axis of the foot projects the calcaneus without foreshortening." }, { "q": "For a lateral knee, the knee is flexed 20-30 degrees and the CR angled 5-7 degrees cephalad in order to:", "options": [ "show the tibial plateau on end", "show the patella tangentially", "open the intercondylar fossa", "superimpose the femoral condyles and avoid obscuring the joint space" ], "answer_index": 3, "explanation": "The slight cephalad angle compensates for the longer medial condyle so the condyles superimpose and the joint space is not obscured." } ] } ] }