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RADT Exam 3 Questions and Answers
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RADT Exam 3 Questions and Answers
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RADT Exam 3 Questions and AnswersDirect square law - Answer -Which law/rule will help to keep a consistent OD with the
change in SID?
15% rule - Answer -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 - Answer -Would you increase or decrease kVp for best image quality in a
patient with a myeloma?
Magnification - Answer -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? - Answer -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 - Answer -How does having a smaller focal spot
affect spatial resolution?
Less magnification, less focal-spot blur, and improved spatial resolution - Answer -How
does increasing SID affect spatial resolution?
decreases distortion; improves/increases spatial resolution - Answer -How does
positioning the part of interest parallel with the image receptor affect spatial resolution?
Barium - Answer -Positive contrast
Air - Answer -Negative contrast
Subject contrast - Answer -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 - Answer -Which resolution (in regards to image quality) is the ability to
image small objects that have high subject contrast?
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