ARRT Radiography Exam Review (300- 400) l Fully solved 2023

Elongation (body part appears longer than normal) is caused by angulation along the ________ axis of the part being imaged. - CORRECT ANSWER Long Foreshortening (body part appears shorter than normal) is caused by angulation against the ________ axis of the part being imaged. - CORRECT ANSWER Main Grids are constructed of ________ strips separated by ________ interspacers. - CORRECT ANSWER 1) Lead 2) Aluminum The height of the lead strips divided by the distance between the lead strips is known as: - CORRECT ANSWER Grid Ratio Grid Ratio Formula: - CORRECT ANSWER H/D The number of lead strips in a grid per inch (or centimeter) is known as: - CORRECT ANSWER Grid Frequency The measure of the ability of a grid to increase contrast is the ________. - CORRECT ANSWER Contrast Improvement Factor The ratio of primary radiation transmitted through the grid to secondary radiation transmitted through the grid is the ________. - CORRECT ANSWER Grid Selectivity Grid conversion factor (GCF) is the amount of exposure ________ necessary to compensate for the ________ of image-forming x-rays and scatter in the cleanup process. - CORRECT ANSWER 1) Increase 2) Absorption Grid conversion factor is also known as: - CORRECT ANSWER Bucky Factor Value How do you calculate the new mAs required for a specific grid using the grid conversion factor? - CORRECT ANSWER GCF of selected grid times the current mAs What is the grid conversion factor for a 5:1 grid? - CORRECT ANSWER 2 What is the grid conversion factor for a 8:1 grid? - CORRECT ANSWER 4 What is the grid conversion factor for a 12:1 grid? - CORRECT ANSWER 5 What is the grid conversion factor for a 16:1 grid? - CORRECT ANSWER 6 When normal density appears in the middle of a radiograph with decreased density on the sides, this is likely a result of: - CORRECT ANSWER Grid Upside Down When image-forming x-rays are absorbed all across the radiographic field, with cutoff (decreased density) visible over the entire radiograph, this is a result of: - CORRECT ANSWER Grid Off-Level When the central ray does not strike the grid in the center, and there is visible cutoff more to one side of the radiograph than the other, the cause is: - CORRECT ANSWER Lateral Decentering When there is normal density in the middle of the radiograph, with cutoff visible on the sides, the cause is likely to be: - CORRECT ANSWER Grid-Focus Decentering ________ is the distance at which focused grids may be used. - CORRECT ANSWER Grid Focus Focus range is ________ for low-ratio grids. - CORRECT ANSWER Wide Focus range is ________ for high-ratio grids. - CORRECT ANSWER Narrow Generally, grids are used when the body part being imaged is ________ cm thick or greater, or when more than ________ kVp is used. - CORRECT ANSWER 1) 10 2) 60