题目内容

According to the inverse square law, if the radiology technician stands twice as far away from the x-ray tube, she will _ her dose of scatter radiation by__.

A. decrease, 2
B. decrease, 4
C. increase, 2
D. increase, 4

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Which technique will give the highest patient dose under the same 90 kVp?

A. 400 mA @ 0.04 sec
B. 400 mA @ 0.02 sec
C. 200 mA @0.02 sec
D. 300 mA @ 0.1 sec

A radiographic exposure of the chest was taken at 72 inches using 20 mAs and had an exposure of 100 mR. What would the exposure roughly be at 80 inches under the same exposure parameters?

A. 40
B. 60
C. 80
D. 100

If one lead apron attenuates 95% of an x-ray beam, two aprons will transmit approximately ____.

A. 5
B. 2.5
C. 1.25
D. 0.25

A grid improves the quality of a diagnostic x-ray primarily by attenuating ___.

A. Primary photons
B. Compton scattered photons
C. Photoelectrons
D. Coherent scattered photons