When switching from an 8:1 grid to a 12: grid at 85 kVp, the change in mAs will be
A)decreased by 15%.
B)increased by 40%.
C)increased by 25%.
D)decreased by 40 %.

Question

Quizplus · Accepted Answer

When switching from a lower grid ratio (8:1) to a higher grid ratio (12:1), the amount of scatter radiation reaching the image receptor is reduced, requiring an increase in mAs to maintain image density. The increase in mAs compensates for the increased attenuation of the x-ray beam by the higher grid. The general rule of thumb for adjusting mAs when changing grid ratios is to increase mAs by a factor related to the grid conversion factors. For an 8:1 to 12:1 grid change, the mAs needs to be increased by approximately 40% to maintain image density.

When Switching from an 8:1 Grid to a 12: Grid