Which statement best describes the effect of using a grid on radiographic image quality?

Which statement best describes the effect of using a grid on radiographic image quality?

• A. Increases scatter
• B. Reduces scatter and improves SNR
• C. Increases patient dose
• D. Decreases dynamic range

Answer: (B)

Grids work by absorbing scatter radiation before it reaches the image receptor. Scatter adds a hazy background that lowers image contrast, so removing much of it lets the primary, useful photons form a sharper image. With less scatter reaching the detector, the image’s contrast improves, making details easier to see, and the signal stands out more clearly relative to noise, boosting the apparent signal-to-noise ratio. It’s true that using a grid often requires a higher exposure to compensate for the grid’s absorption of some primary photons, which can increase patient dose, but the direct effect on image quality is the reduction of scatter and the resulting improvement in contrast and SNR. The grid doesn’t primarily change dynamic range.

Grids work by absorbing scatter radiation before it reaches the image receptor. Scatter adds a hazy background that lowers image contrast, so removing much of it lets the primary, useful photons form a sharper image. With less scatter reaching the detector, the image’s contrast improves, making details easier to see, and the signal stands out more clearly relative to noise, boosting the apparent signal-to-noise ratio. It’s true that using a grid often requires a higher exposure to compensate for the grid’s absorption of some primary photons, which can increase patient dose, but the direct effect on image quality is the reduction of scatter and the resulting improvement in contrast and SNR. The grid doesn’t primarily change dynamic range.