If an imaging system with an RS value of 200 requires an exposure of 12 mAs, switching to a system with RS 800 speed will
A)require 3 mAs.
B)require 48 mAs.
C)require a 15% increase in kVp.
D)improve image resolution.

Question

Quizplus · Accepted Answer

The relative speed (RS) of an imaging system indicates how much exposure is needed to produce an image. When switching from an RS of 200 to 800, the system becomes more sensitive, requiring less exposure. The speed increase is by a factor of 4 (800/200), so the exposure needed decreases by the same factor, from 12 mAs to 3 mAs (12 mAs / 4).

If an Imaging System with an RS Value of 200