Which of the following technical factors should be chosen when 20 mAs is desired and the patient being imaged has difficulty remaining still?
A) 200 mA at 0.1 sec
B) 400 mA at 0.05 sec
C) 100 mA at 0.4 sec
D) 100 mA at 0.2 sec

Question

Quizplus · Accepted Answer

To achieve 20 mAs, the product of the chosen milliamperage (mA) and exposure time (sec) must equal 20.

A. 200 mA at 0.1 sec = 20 mAs 
B. 400 mA at 0.05 sec = 20 mAs 
C. 100 mA at 0.4 sec = 40 mAs 
D. 100 mA at 0.2 sec = 20 mAs

Option B is the best choice because a shorter exposure time of 0.05 seconds is less likely to result in motion blur caused by patient movement. Higher mA settings typically produce sharper images, but a longer exposure time may result in motion blur.

Which of the Following Technical Factors Should Be Chosen When