Download ARRT Exam Prep: Radiography Questions and Answers and more Exams Radiology in PDF only on Docsity!
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The brightness gained by an image intensification tube is the product of which of the following? A. Minification gain times tube distance B. Minification gain times flux gain C. Flux gain times mA D. mA times kVp times tube-to-table distance - correct answer ✅B (Minification gain is a result of the focusing of the electron beam to a smaller output phosphor. Flux gain is the result of accelerating the electron beam through a series of electrostatic lens. Multiply the two together to get the brightness gained.) This AP radiograph of the hip was done using automatic exposure control (AEC). What could have made it come out underexposed? A. mA set too low B. Small focal spot used C. Back-up time too short
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D. kVp too high - correct answer ✅C (AEC is designed to reproduce a predetermined density. Changing mA, kVp and focal spot size should still produce the correct density. However, if the back-up time is too short, it will terminate the exposure before the ionization device does.) The skull and spine make up which of the following? A. True skeleton B. Bony skeleton C. Axial skeleton D. Appendicular skeleton - correct answer ✅C (The limbs, shoulder girdle, and pelvic girdle make up the appendicular skeleton) During retrograde urography contrast media is administered in which of the following ways? A. Intravenously B. Via a cystoscope
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The margin of error a radiographer has in setting his/her technical factors and still obtaining a diagnostic quality image is known as what? A. Luck B. Technical margin C. Exposure latitude D. Error area - correct answer ✅C (Exposure latitude is the range of technical factor settings that will produce a diagnostic quality radiograph. For example, if 40 mAs will produce a perfect density, anything between 30 mAs - 50 mAs will produce a diagnostic quality image. This 20 mAs range is the margin of error or exposure latitude.) Which of the following would NOT be considered a type of transmission-based precaution? A. AIDS B. Contact C. Airborne
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D. Droplet
. - correct answer ✅A (Contact isolation prevents the spread of diseases like staphylococcus, airborne isolation prevents the spread of airborne diseases like tuberculosis, and droplet precautions prevents the spread of diseases like influenza) After a barium enema, you notice that the sheets have fecal material and blood on them. What should be done with the sheets? A. Place them in a leak proof linen bag B. Place them in a red biohazardous bag C. Place them in a red bag and then put them in a leak-proof linen bag D. Double bag them - correct answer ✅A (Linen bags must be leak-proof. Also, all linen is considered contaminated. Therefore, simply place the sheets in the linen hamper as you would with any other sheet. The laundry will handle them properly.)
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Which of the following positions/projections will best demonstrate the distal tibiofibular joint? A. AP B. 15 - 20 degree medial oblique C. 45 degree medial oblique D. Lateral - correct answer ✅C (The distal tibiofibular joint is best visualized with a 45 degree medial oblique position of the ankle. A 15 - 20 degree medial oblique position (Mortise) will best demonstrate the entire ankle joint.) Which bones make up the elbow joint? A. Radius and ulna B. Radius and humerus C. Radius, ulna and humerus D. Capitulum, trochlea and radial head - correct answer ✅C (The elbow joint is made up of articulations between the forearm (radius and ulna) and the upper arm (humerus).)
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Which of the following positions is used to demonstrate foreign bodies in the hand? A. Tunnel B. Carpal C. Ulnar flexion D. Lateral in extension - correct answer ✅D (A lateral hand with the fingers extended would show the depth of a foreign body within the hand.) There is only one safe solution that can be used to clean photostimulable phosphor plates. Which one is it? A. Water B. Alcohol C. Isopropyl methanol D. Anhydrous ethyl alcohol - correct answer ✅D (It is imperative that the image plates be cleaned only with anhydrous ethyl alcohol
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D. Flat contact shield under the pelvis - correct answer ✅D (The shield has to go between the fluoroscopic tube (under the table) and the child.) A dose of whole body radiation that will kill 50% of the exposed individuals within 60 days is referred to as: A. death dose. B. fatal dose. C. destructive dose. D. LD50/60. - correct answer ✅D (LD50/60 means that 50% of the exposed individuals would die within 60 days; it would take a whole body dose of 350 rads.) When should the exposure be made for an AP projection or lateral position of the upper airway? A. After deep inspiration B. After expiration C. During a slow, deep inspiration
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D. During rapid respiration - correct answer ✅C (Exposure during a slow, deep inspiration ensures filling of the upper airway with air.) Failure to collimate accurately while using AEC may result in a radiograph that is: A. underexposed. B. overexposed. C. lacking recorded detail. D. magnified.
. - correct answer ✅A (Scatter radiation from outside the area of interest can reach the ionization chamber, causing the exposure to be stopped prematurely) When comparing the two knee radiographs, radiograph "A" exhibits: A. overexposure. B. overpenetration. C. underexposure.
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D. Pictograph - correct answer ✅A (A histogram plots the numerical values and how frequently they occur.) Which of the following refers to the movement of the imaging plate as it is being read by the laser? A. Fast scan B. Slow scan C. Direction D. Sliding - correct answer ✅B (The imaging plate slowly moves through the reader as it is being rapidly scanned by the laser.) To assure the maximum radiation protection, which of the following is important? A. Accurate technique selection B. Proper gonadal shielding C. Careful collimation
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D. All of the above - correct answer ✅D (These three factors should be considered before each exposure.) Which of the following publications recommends limits of exposure to ionizing radiation? A. NCRP # B. NCRP # C. NCRP # D. NCRP #116 - correct answer ✅D (NCRP #116 is titled "Limitation of Exposure to Ionizing Radiation" and sets equivalent dose limits for exposure to ionizing radiation of radiation workers and the general public.) Which of the following is NOT a radiation protection measure? A. High kVp techniques B. Shielding C. High speed film-screen combinations
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B. Adjust head so the lower margin of the upper incisors and the mastoid tips are superimposed C. Rotate the head 45 degrees D. Extend the chin until the mentomeatal line is perpendicular to the cassette - correct answer ✅B (Another way of saying this is to have the occlusal plane and the base of the skull superimposed.) For a true lateral position of the skull, the midsagittal plane must be in which for these positions? A. Perpendicular to the image receptor B. At a right angle to the image receptor C. Parallel to the image receptor D. Parallel to the CR - correct answer ✅C (The midsagittal plane must be parallel to the image receptor and perpendicular to the CR.) Medications include which of the following?
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A. Contrast media B. Analgesics C. Diuretics D. All of the above - correct answer ✅D (In addition to analgesics and diuretics, contrast media is considered medication and must be reconciled with the patient's medication history.) What does PACS stand for? A. Patient access computer system B. Pictures accessed by computers C. Picture access computer system D. Picture archiving and communication system - correct answer ✅D (A PACS stores (archives) images and patient information and allows it to be accessed (communication) by other computer users in the network.)
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In a busy imaging department, how often should CR imaging plates be cleaned? A. Daily B. Weekly C. Monthly D. Yearly - correct answer ✅C (Dirty imaging plates can cause white specks that can look like calcifications.) Non-ionic, water-soluble iodinated contrast media: A. contains no iodine. B. produces no adverse reaction. C. does not dissolve into charged particles. D. is less expensive than ionic, water-soluble contrast media. - correct answer ✅C (An ion is a charged atom or molecule, meaning it has either a negative or positive charge. An ion will react differently than neutral atoms or molecules, which may cause adverse chemical
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reactions. Nonionic contrast media does not dissociate and is therefore safer.) The quality of an image displayed on a monitor depends on which of the following?
- Matrix size
- Size of field of view
- Bit depth A. 1 only B. 2 only C. 2 & 3 only D. 1, 2 & 3 . - correct answer ✅D (The larger the matrix size, the smaller the field of view (FOV), and the higher the bit depth the better the image) Which of the following positions of the abdomen should be used to demonstrate air-fluid levels when an erect position cannot be obtained?
