ARRT Radiography Exam Review (300-400) Questions with Complete Solutions

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