Why is it recommended to increase the mAs when using a grid in radiographic imaging?

• A. To Shorten Exposure Time
• B. To Improve Grid Alignment
• C. To Decrease Patient Dose
• D. To Adjust for the Attenuation of the Primary Photons

Answer: (D)

Using a radiographic grid reduces the number of primary photons reaching the image receptor because the lead strips absorb some of the beam. To keep the image receptor exposure and brightness consistent, you increase the mAs so more photons are produced to compensate for that loss. This adjustment specifically accounts for the attenuation of primary photons by the grid. Other choices don’t address the need to offset grid attenuation, and while increasing mAs raises patient dose, it’s the grid’s attenuation of photons that requires this compensation.