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ARRT Radiography Exam Review (300- 400)

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ARRT Radiography Exam Review (300- 400) Elongation (body part appears longer than normal) is caused by angulation along the ________ axis of the part being imaged. - ANS - Long Foreshortening (body part appears short ...

ARRT Radiography Exam Review (300- 400) Elongation (body part appears longer than normal) is caused by angulation along the ________ axis of the part being imaged. - ANS - Long Foreshortening (body part appears shorter than normal) is caused by angulation against the ________ axis of the part being imaged. - ANS - Main Grids are constructed of ________ strips separated by ________ interspacers. - ANS - 1) Lead 2) Aluminum The height of the lead strips divided by the distance between the lead strips is known as: - ANS - Grid Ratio Grid Ratio Formula: - ANS - H/D The number of lead strips in a grid per inch (or centimeter) is known as: - ANS - Grid Frequency The measure of the ability of a grid to increase contrast is the ________. - ANS - Contrast Improvement Factor The ratio of primary radiation transmitted through the grid to secondary radiation transmitted through the grid is the ________. - ANS - 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. - ANS - 1) Increase 2) Absorption Grid conversion factor is also known as: - ANS - Bucky Factor Value How do you calculate the new mAs required for a specific grid using the grid conversion factor? - ANS - GCF of selected grid times the current mAs What is the grid conversion factor for a 5:1 grid? - ANS - 2 What is the grid conversion factor for a 8:1 grid? - ANS - 4 What is the grid conversion factor for a 12:1 grid? - ANS - 5 What is the grid conversion factor for a 16:1 grid? - ANS - 6 When normal density appears in the middle of a radiograph with decreased density on the sides, this is likely a result of: - ANS - 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: - ANS - 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: - ANS - 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: - ANS - Grid-Focus Decentering

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