To maintain receptor exposure when using a grid, you should increase which parameter?

To maintain receptor exposure when using a grid, you should increase which parameter?

• A. Increase kVp
• B. Decrease mA
• C. Increase mAs
• D. Increase time

Answer: (C)

When a grid is used, it absorbs some of the primary beam as well as scatter, which reduces the amount of radiation reaching the image receptor. To keep the same receptor exposure, you need more primary photons to arrive at the detector. The way to achieve that is by increasing the milliampere-seconds (mAs), which raises the number of photons produced in the beam. So, boosting mAs compensates for the grid’s attenuation and maintains image receptor exposure. Increasing kVp would change beam quality and scatter in ways that aren’t a direct compensation for grid attenuation, and decreasing mA or increasing time without raising overall mAs would not reliably maintain receptor exposure.

When a grid is used, it absorbs some of the primary beam as well as scatter, which reduces the amount of radiation reaching the image receptor. To keep the same receptor exposure, you need more primary photons to arrive at the detector. The way to achieve that is by increasing the milliampere-seconds (mAs), which raises the number of photons produced in the beam. So, boosting mAs compensates for the grid’s attenuation and maintains image receptor exposure. Increasing kVp would change beam quality and scatter in ways that aren’t a direct compensation for grid attenuation, and decreasing mA or increasing time without raising overall mAs would not reliably maintain receptor exposure.