If a shoulder examination is done using an 8:1 ratio grid and 12 mAs, how much mAs should be used if the examination must be done tabletop (no grid)?

Question

Quizplus · Accepted Answer

When removing a grid, especially moving from an 8:1 grid to a tabletop (no grid), the mAs needs to be reduced due to the absence of the grid's absorption of scatter radiation. The general rule for adjusting mAs when changing grid ratios is based on the grid conversion factor (GCF). For an 8:1 grid, the GCF is approximately 4. Therefore, to maintain image quality without the grid, you divide the original mAs (12 mAs) by the GCF (4), resulting in 3 mAs.

If a Shoulder Examination Is Done Using an 8:1 Ratio