ARRT Radiography Exam Review (300-400)questions & Answers

Elongation (body part appears longer than normal) is caused by angulation along the ________ axis of the part being imaged. - answer-Long Foreshortening (body part appears shorter than normal) is caused by angulation against the ________ axis of the part being imaged. - answer-Main Grids are constructed of ________ strips separated by ________ interspacers. - answer-1) Lead 2) Aluminum The height of the lead strips divided by the distance between the lead strips is known as: - answer-Grid Ratio Grid Ratio Formula: - answer-H/D The number of lead strips in a grid per inch (or centimeter) is known as: - answer-Grid Frequency The measure of the ability of a grid to increase contrast is the ________. - answer-Contrast Improvement Factor The ratio of primary radiation transmitted through the grid to secondary radiation transmitted through the grid is the ________. - answer-Grid Selectivity