When using a grid to improve image quality, what factor must be adjusted to compensate for the increased attenuation of the x-ray beam?

When using a grid to improve image quality, what factor must be adjusted to compensate for the increased attenuation of the x-ray beam?

• A. kVp
• B. Distance
• C. mAs
• D. Grid ratio

Answer: (C)

When a grid is used, more of the primary x-ray photons are absorbed by the grid’s lead strips, so the beam reaching the image receptor is reduced. To keep the same receptor exposure and image brightness, you increase the amount of radiation produced, which is done by raising the mAs (either longer exposure time or higher tube current). This is the standard way to compensate for the extra attenuation caused by the grid. Changing kVp would alter the beam’s energy and image contrast in ways that aren’t used to compensate for grid attenuation. Adjusting distance changes exposure according to the inverse square law but isn’t how we typically offset grid-induced attenuation in a single exposure. The grid ratio is a fixed property of the grid and isn’t something you adjust during exposure.

When a grid is used, more of the primary x-ray photons are absorbed by the grid’s lead strips, so the beam reaching the image receptor is reduced. To keep the same receptor exposure and image brightness, you increase the amount of radiation produced, which is done by raising the mAs (either longer exposure time or higher tube current). This is the standard way to compensate for the extra attenuation caused by the grid.

Changing kVp would alter the beam’s energy and image contrast in ways that aren’t used to compensate for grid attenuation. Adjusting distance changes exposure according to the inverse square law but isn’t how we typically offset grid-induced attenuation in a single exposure. The grid ratio is a fixed property of the grid and isn’t something you adjust during exposure.