ARRT Radiography Exam Review (300-400) || errorless
answers 100%.
Elongation (body part appears longer than normal) is caused by angulation along the ________
axis of the part being imaged. correct answers Long
Foreshortening (body part appears shorter than normal) is caused by angulation against the
________ axis of the part being imaged. correct answers Main
Grids are constructed of ________ strips separated by ________ interspacers. correct answers 1)
Lead
2) Aluminum
The height of the lead strips divided by the distance between the lead strips is known as: correct
answers Grid Ratio
Grid Ratio Formula: correct answers H/D
The number of lead strips in a grid per inch (or centimeter) is known as: correct answers Grid
Frequency
The measure of the ability of a grid to increase contrast is the ________. correct answers
Contrast Improvement Factor
The ratio of primary radiation transmitted through the grid to secondary radiation transmitted
through the grid is the ________. correct answers 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 answers 1)
Increase
, 2) Absorption
Grid conversion factor is also known as: correct answers Bucky Factor Value
How do you calculate the new mAs required for a specific grid using the grid conversion factor?
correct answers GCF of selected grid times the current mAs
What is the grid conversion factor for a 5:1 grid? correct answers 2
What is the grid conversion factor for a 8:1 grid? correct answers 4
What is the grid conversion factor for a 12:1 grid? correct answers 5
What is the grid conversion factor for a 16:1 grid? correct answers 6
When normal density appears in the middle of a radiograph with decreased density on the sides,
this is likely a result of: correct answers 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 answers 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 answers 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 answers Grid-Focus Decentering
________ is the distance at which focused grids may be used. correct answers Grid Focus
answers 100%.
Elongation (body part appears longer than normal) is caused by angulation along the ________
axis of the part being imaged. correct answers Long
Foreshortening (body part appears shorter than normal) is caused by angulation against the
________ axis of the part being imaged. correct answers Main
Grids are constructed of ________ strips separated by ________ interspacers. correct answers 1)
Lead
2) Aluminum
The height of the lead strips divided by the distance between the lead strips is known as: correct
answers Grid Ratio
Grid Ratio Formula: correct answers H/D
The number of lead strips in a grid per inch (or centimeter) is known as: correct answers Grid
Frequency
The measure of the ability of a grid to increase contrast is the ________. correct answers
Contrast Improvement Factor
The ratio of primary radiation transmitted through the grid to secondary radiation transmitted
through the grid is the ________. correct answers 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 answers 1)
Increase
, 2) Absorption
Grid conversion factor is also known as: correct answers Bucky Factor Value
How do you calculate the new mAs required for a specific grid using the grid conversion factor?
correct answers GCF of selected grid times the current mAs
What is the grid conversion factor for a 5:1 grid? correct answers 2
What is the grid conversion factor for a 8:1 grid? correct answers 4
What is the grid conversion factor for a 12:1 grid? correct answers 5
What is the grid conversion factor for a 16:1 grid? correct answers 6
When normal density appears in the middle of a radiograph with decreased density on the sides,
this is likely a result of: correct answers 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 answers 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 answers 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 answers Grid-Focus Decentering
________ is the distance at which focused grids may be used. correct answers Grid Focus
