ARRT Radiography Registry Mock Exam 3: ELITE EXIT EXAM PREP – 100% ACCURACY & SUCCESS GUARANTEE THE MASTER KEY: FULL EXAM REPOSITORY & DETAILED SOLUTIONS

Which of the following is (are) demonstrated in the lateral projection of the thoracic spine? 1. Intervertebral spaces 2. Apophyseal joints 3. Intervertebral foramina A. 1 only B. 2 only C. 1 and 3 only D. 1, 2, and 3 Correct Answer: C Rationale: In the lateral projection of the thoracic spine, intervertebral disk spaces and intervertebral foramina are clearly demonstrated. Apophyseal (zygapophyseal) joints are best visualized in a 70° oblique position. Question 2 How is source-to-image distance (SID) related to exposure rate and radiographic density? A. As SID increases, exposure rate increases and radiographic density increases. B. As SID increases, exposure rate increases and radiographic density decreases. C. As SID increases, exposure rate decreases and radiographic density increases. D. As SID increases, exposure rate decreases and radiographic density decreases. Correct Answer: D Rationale: Increasing SID reduces the intensity of radiation reaching the image receptor, thereby decreasing both exposure rate and radiographic density according to the inverse square law. Question 3 Which of the following can affect radiographic contrast? 1. Processing 2. Pathology 3. OID A. 1 only B. 1 and 2 only C. 1 and 3 only D. 1, 2, and 3 Correct Answer: D Rationale: Processing (e.g., chemical development or digital lookup tables), pathologic conditions (e.g., edema or pneumothorax changing subject contrast), and object-to-image distance (OID, via the air-gap technique) can all significantly influence radiographic contrast. Question 4 Below-diaphragm ribs are better demonstrated when: A. Respiration is suspended at the end of full inhalation. B. Exposed using shallow breathing technique. C. The patient is in the recumbent position. D. The patient is in the AP erect position. Correct Answer: C Rationale: The recumbent position improves visualization of below-diaphragm ribs because gravity shifts the abdominal contents upward, making the diaphragm place less density variation over the lower ribs, while also minimizing patient movement. Question 5 To demonstrate the glenoid fossa in profile, the patient is positioned: A. 45° oblique, affected side up B. 45° oblique, affected side down C. 25° oblique, affected side up D. 25° oblique, affected side down Correct Answer: B Rationale: A 45° posterior oblique position (Grashey method) with the affected side down aligns the scapulohumeral (glenoid) cavity parallel to the central ray, bringing it directly into profile. Question 6 Which cholangiographic procedure uses an indwelling drainage tube for contrast medium administration? A. Endoscopic retrograde cholangiopancreatography (ERCP) B. Operative cholangiography C. T-tube cholangiography D. Percutaneous transhepatic cholangiography Correct Answer: C Rationale: A T-tube cholangiogram is performed postoperatively using an indwelling, Tshaped tube previously placed in the common bile duct during surgery to inject contrast and visualize the biliary tree. Question 7 How is source-to-image distance (SID) related to exposure rate and radiographic density? A. As SID increases, exposure rate increases and radiographic density increases. B. As SID increases, exposure rate increases and radiographic density decreases. C. As SID increases, exposure rate decreases and radiographic density increases. D. As SID increases, exposure rate decreases and radiographic density decreases. Correct Answer: D Rationale: Increasing the SID spreads the beam over a larger area, which decreases the exposure rate and subsequent radiographic density at the image receptor in accordance with the inverse square law. Question 8 As the image intensifier's field of view (FOV) is reduced, how is the resulting image affected? 1. Magnification increases 2. Brightness decreases 3. Quality increases A. 1 only B. 1 and 2 only C. 2 and 3 only D. 1, 2, and 3 Correct Answer: D Rationale: Reducing the FOV in a multi-field image intensifier causes magnification. Because fewer photoelectrons are focused onto the output phosphor, image brightness inherently decreases (which prompts automatic brightness control to increase dose). Image quality/resolution increases because the focal point changes, utilizing a more central, sharper area of the input phosphor. Question 9 Which of the following is (are) characteristic(s) of a 5:1 grid? 1. It allows some positioning latitude. 2. It is used with high-kilovoltage exposures. 3. It absorbs a high percentage of scattered radiation. A. 1 only B. 1 and 3 only C. 2 and 3 only D. 1, 2, and 3 Correct Answer: A Rationale: A 5:1 grid is a low-ratio grid that offers wide positioning latitude, meaning it is more forgiving to centering and angling errors. However, it does not efficiently absorb high percentages of scatter and is completely inadequate for high-kVp techniques. Question 10 Which of the following are demonstrated in the oblique position of the cervical spine? 1. Intervertebral foramina 2. Apophyseal joints 3. Intervertebral joints A. 1 only B. 1 and 2 only C. 2 and 3 only D. 1, 2, and 3 Correct Answer: A Rationale: Oblique projections of the cervical spine are explicitly utilized to open up and demonstrate the intervertebral foramina. The apophyseal (zygapophyseal) joints are only seen in a true lateral view. Question 11 If a radiograph exhibits insufficient density, this might be attributed to: 1. Inadequate kVp 2. Inadequate SID 3. Grid cutoff A. 1 only B. 1 and 2 only C. 1 and 3 only D. 1, 2, and 3 Correct Answer: C Rationale: Inadequate kVp leads to insufficient beam penetration and low density. Grid cutoff results in the unintended absorption of primary beam photons, reducing density. In contrast, an inadequate (shorter) SID would drastically increase density due to the inverse square law. Question 12 Methods that help to reduce the production of scattered radiation include using: 1. Compression 2. Beam restriction 3. A grid A. 1 and 2 only B. 1 and 3 only C. 2 and 3 only D. 1, 2, and 3 Correct Answer: A Rationale: Compression and beam restriction (collimation) actively reduce the volume of tissue irradiated, directly limiting the production of scatter. Grids do nothing to stop scatter from being produced; they simply clean it up after it leaves the patient's body. Question 13 The right anterior oblique (RAO) of the cervical spine requires which of the following combinations of tube angle and direction? A. 15° to 20° caudad B. 15° to 20° cephalad C. 25° to 30° caudad D. 25° to 30° cephalad Correct Answer: A Rationale: Anterior oblique positions of the cervical spine (RAO/LAO) require a 15° to 20° caudad angle to open the intervertebral foramina that are closest to the image receptor. Posterior obliques require a cephalad angle. Question 14 When using the smaller field in a dual-field image intensifier: 1. A smaller patient area is viewed. 2. The image is magnified. 3. The image is less bright. A. 1 only B. 1 and 3 only C. 2 and 3 only D. 1, 2, and 3 Correct Answer: D Rationale: Selecting a smaller input field size focuses on a smaller anatomic region, magnifying the visible structures. Because fewer photons hit the smaller input area, the resulting image is inherently less bright unless patient exposure parameters are automatically increased. Question 15 In which type of monitoring device do photons release electrons by their interaction with air? A. Film badge B. TLD C. Pocket dosimeter D. OSL dosimeter Correct Answer: C Rationale: A pocket dosimeter contains a miniature ionization chamber. When radiation photons interact with the air inside the chamber, they ionize the air molecules, releasing electrons that discharge the internal capacitor. Question 16 Component part(s) of x-ray film include which of the following? 1. Phosphor layer 2. Gelatin emulsion 3. Adhesive layer A. 1 only B. 1 and 3 only C. 2 and 3 only D. 1, 2, and 3 Correct Answer: C Rationale: Radiographic film is constructed of a base layer, an adhesive layer, and a gelatin emulsion holding the silver halide crystals. A phosphor layer is found in intensifying screens or CR imaging plates, not inside the x-ray film itself. Question 17 Which of the following projections of the ankle would best demonstrate the distal tibiofibular joint? A. Medial oblique 15° to 20° B. Lateral oblique 15° to 20° C. Medial oblique 45° D. Lateral oblique 45° Correct Answer: C Rationale: A 45° medial oblique projection of the ankle rotates the fibula away from the tibia, opening up and clearly demonstrating the distal tibiofibular articulation. (Note: A 15° to 20° medial oblique is used for the ankle mortise joint). Question 18 The minimum requirement for lead-equivalent content in protective aprons is: A. 0.05 mm Pb B. 0.50 mm Pb C. 0.25 mm Pb D. 1.0 mm Pb Correct Answer: C Rationale: According to radiation safety standards (such as NCRP regulations), protective aprons must provide a minimum of 0.25 mm lead-equivalent protection, though 0.50 mm Pb is highly recommended and widely preferred in high-scatter environments like fluoroscopy. Question 19 With the patient seated at the end of the x-ray table, elbow flexed 80 degrees, and the CR directed 45 degrees laterally from the shoulder to the elbow joint, which of the following structures will be demonstrated best? A. Radial head B. Ulnar head C. Coronoid process D. Olecranon process Correct Answer: C Rationale: This positioning describes the Coyle method (axial trauma projection) specifically tailored for the coronoid process. Flexing the elbow to 80° and angling the beam 45° away from the shoulder projects the radial head out of the way, leaving the coronoid process in profile. Question 20 Deposition of vaporized tungsten on the inner surface of the x-ray tube glass window: 1. Acts as additional filtration 2. Results in increased tube output 3. Results in anode pitting A. 1 only B. 1 and 2 only C. 2 and 3 only D. 1, 2, and 3 Correct Answer: A Rationale: As an x-ray tube ages, tungsten evaporates from the filament and coats the inside of the glass window. This layer absorbs low-energy x-ray photons, acting as unwanted inherent filtration. This filtration decreases total tube output rather than increasing it. Anode pitting is caused by thermal stress, not vaporized tungsten.