Elongation (body part appears longer than normal) is caused by angulation along the ________ axis of the part being imaged. - Answer
... [Show More] 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
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. - Answer 1) Increase
2) Absorption
Grid conversion factor is also known as: - Answer Bucky Factor Value
How do you calculate the new mAs required for a specific grid using the grid conversion factor? - Answer GCF of selected grid times the current mAs
What is the grid conversion factor for a 5:1 grid? - Answer 2
What is the grid conversion factor for a 8:1 grid? - Answer 4
What is the grid conversion factor for a 12:1 grid? - Answer 5
What is the grid conversion factor for a 16:1 grid? - Answer 6
When normal density appears in the middle of a radiograph with decreased density on the sides, this is likely a result of: - 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: - 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: - 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: - Answer Grid-Focus Decentering
________ is the distance at which focused grids may be used. - Answer Grid Focus
Focus range is ________ for low-ratio grids. - Answer Wide
Focus range is ________ for high-ratio grids. - Answer Narrow
Generally, grids are used when the body part being imaged is ________ cm thick or greater, or when more than ________ kVp is used. - Answer 1) 10
2) 60 [Show Less]