RADT Exam 3 UPDATED ACTUAL
QUESTIONS and CORRECT Answers
Direct square law - CORRECT ANSWER - Which law/rule will help to keep a consistent
OD with the change in SID?
15% rule - CORRECT 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 - CORRECT ANSWER - Would you increase or decrease kVp for best
image quality in a patient with a myeloma?
Magnification - CORRECT 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? - CORRECT
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 - CORRECT ANSWER - How does having a
smaller focal spot affect spatial resolution?
Less magnification, less focal-spot blur, and improved spatial resolution - CORRECT
ANSWER - How does increasing SID affect spatial resolution?
decreases distortion; improves/increases spatial resolution - CORRECT ANSWER - How
does positioning the part of interest parallel with the image receptor affect spatial resolution?
Barium - CORRECT ANSWER - Positive contrast
, Air - CORRECT ANSWER - Negative contrast
Subject contrast - CORRECT 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 - CORRECT ANSWER - Which resolution (in regards to image quality)
is the ability to image small objects that have high subject contrast?
Contrast resolution - CORRECT ANSWER - What resolution (regarding image quality) is
the ability to distinguish anatomical structures of similar subject contrast (Ability to distinguish
between similar tissues)?
Density - CORRECT ANSWER - In radiography, ________ is a visible representation of
the quantity of X-ray photons reaching the IR.
Increasing mAs - CORRECT ANSWER - Increases density
Motion blur - CORRECT ANSWER - Blurred region would seen over entire
image;technologist has a lot of control over reducing this type of bur
Focal spot blur - CORRECT ANSWER - Blurred region on the outermost edge of the
image; technologist has little or no control over
Decreasing kVp - CORRECT ANSWER - Increases beam attenuation,
increases absorption,
and decreases transmission
Increasing kVp - CORRECT ANSWER - decreases beam attenuation,
decreases absorption,
QUESTIONS and CORRECT Answers
Direct square law - CORRECT ANSWER - Which law/rule will help to keep a consistent
OD with the change in SID?
15% rule - CORRECT 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 - CORRECT ANSWER - Would you increase or decrease kVp for best
image quality in a patient with a myeloma?
Magnification - CORRECT 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? - CORRECT
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 - CORRECT ANSWER - How does having a
smaller focal spot affect spatial resolution?
Less magnification, less focal-spot blur, and improved spatial resolution - CORRECT
ANSWER - How does increasing SID affect spatial resolution?
decreases distortion; improves/increases spatial resolution - CORRECT ANSWER - How
does positioning the part of interest parallel with the image receptor affect spatial resolution?
Barium - CORRECT ANSWER - Positive contrast
, Air - CORRECT ANSWER - Negative contrast
Subject contrast - CORRECT 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 - CORRECT ANSWER - Which resolution (in regards to image quality)
is the ability to image small objects that have high subject contrast?
Contrast resolution - CORRECT ANSWER - What resolution (regarding image quality) is
the ability to distinguish anatomical structures of similar subject contrast (Ability to distinguish
between similar tissues)?
Density - CORRECT ANSWER - In radiography, ________ is a visible representation of
the quantity of X-ray photons reaching the IR.
Increasing mAs - CORRECT ANSWER - Increases density
Motion blur - CORRECT ANSWER - Blurred region would seen over entire
image;technologist has a lot of control over reducing this type of bur
Focal spot blur - CORRECT ANSWER - Blurred region on the outermost edge of the
image; technologist has little or no control over
Decreasing kVp - CORRECT ANSWER - Increases beam attenuation,
increases absorption,
and decreases transmission
Increasing kVp - CORRECT ANSWER - decreases beam attenuation,
decreases absorption,
