RADT Exam 3 With Solutions 100% Correct
Direct square law Which law/rule will help to keep a consistent OD with the change in
SID?
15% rule Due to patient circumstances you want to decrease patient exposure and keep a
consistent OD. Which principle involves decreasing mAs by 1/2 and increasin...
Direct square law Which law/rule will help to keep a consistent OD with the change in
SID?
15% rule Due to patient circumstances you want to decrease patient exposure and keep a
consistent OD. Which principle involves decreasing mAs by 1/2 and increasing kVp by 15%?
Increase kVp Would you increase or decrease kVp for best image quality in a patient with
a myeloma?
Magnification All images on a radiograph demonstrate some level of an increase is size of
objects compared to the anatomy they represent
Would we want a high or low scale of contrast for extremity work? High scale of contrast.
It is a low or short gray scale (not very many shades of gray) with a sharp difference between
each color of gray (a high scale of contrast)
Increases (improves) spatial resolution How does having a smaller focal spot affect spatial
resolution?
, RADT Exam 3 With Solutions 100% Correct
Less magnification, less focal-spot blur, and improved spatial resolution How does
increasing SID affect spatial resolution?
decreases distortion; improves/increases spatial resolution How does positioning the part
of interest parallel with the image receptor affect spatial resolution?
Barium Positive contrast
Air Negative contrast
Subject contrast What type of contrast is determined by the size, shape, and x-ray
attenuating characteristics of the subject who is being examined and the energy of the x-ray beam
Spatial resolution Which resolution (in regards to image quality) is the ability to image
small objects that have high subject contrast?
Contrast resolution What resolution (regarding image quality) is the ability to distinguish
anatomical structures of similar subject contrast (Ability to distinguish between similar tissues)?
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