A radiographic examination has been taken using the following exposure conditions: 400 mA, 70 ms, 80 kVp, 1,2 mm fs, 200 RS receptor, 12: grid, 44" SID
To increase the contrast, the most appropriate choice would be to
A)increase the mA to 500 and decrease time to 56 ms.
B)switch to the 0.8 mm focal spot.
C)switch to a 400 RS receptor and decrease the mAs.
D)switch to a 16:1 grid and increase mAs.

Question

Quizplus · Accepted Answer

Switching to a higher grid ratio (16:1) will improve contrast by reducing scatter radiation. Increasing the mAs will compensate for the increased absorption from the grid. Switching to a different receptor or decreasing mAs will have little effect on contrast, and switching to a smaller focal spot size would increase spatial resolution but not necessarily contrast. Changing the mA and time would have little impact on contrast as they only affect overall exposure.

A Radiographic Examination Has Been Taken Using the Following Exposure