Question

27 multiple choice 1 point after completing an upright abdomen radiograph using a.e.c., you notice some degree of motion artifact on the final image. to improve the repeat image results, your best option would be to decrease the kvp. increase your distance. double the ma and decrease the kvp by 15 percent. increase the kvp by 15 percent with mas compensation. 28 multiple choice 1 point which of the following sets of exposure factors would best control involuntary motion? 100 ma, 0.09 sec 300 ma, 30 ms 500 ma, 18 ms 200 ma, 0.045 sec

Explanation:

For question 27, to reduce motion artifact, increasing kVp with mAs compensation can decrease exposure time which helps. For question 28, shorter exposure times are better for controlling involuntary motion. We calculate mAs (milli - ampere seconds) for each option in question 28. For 100 mA, 0.09 sec, mAs = 100×0.09 = 9; for 300 mA, 30 ms (0.03 s), mAs = 300×0.03 = 9; for 500 mA, 18 ms (0.018 s), mAs = 500×0.018 = 9; for 200 mA, 0.045 sec, mAs = 200×0.045 = 9. But the shortest exposure time is 18 ms in the 500 mA, 18 ms option.

Answer:

1. increase the kVp by 15 percent with mAs compensation
2. 500 mA, 18 ms