If 25 mAs produce a diagnostic image when a 6:1 ratio grid is used, how much mAs should be used with a 12:1 ratio grid?

Question

Quizplus · Accepted Answer

When changing from a 6:1 grid to a 12:1 grid, the amount of mAs needs to be increased to maintain image quality because the higher grid ratio absorbs more scatter radiation but also requires more radiation to produce the image. The mAs can be adjusted according to the grid conversion factor (GCF). The GCF for a 6:1 grid is approximately 3, and for a 12:1 grid, it is approximately 5. Therefore, to find the new mAs: original mAs (25) x new GCF (5) / old GCF (3) = 41.67, which rounds to 42 mAs.

If 25 MAs Produce a Diagnostic Image When a 6:1