题目内容

In order to double the quantity of a beam of X-ray, which one of the following approaches is NOT correct?

A. Double the exposure time.
B. Double the tube current.
C. Double the tube voltage.
D. Increase 15% of the tube voltage.

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Inverse Square Law is useful in radiography because it indicates how the radiation intensity is affected by ___.

A. radioactive decay
B. distance from the source
C. the size of the source
D. none of the above

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

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