Which statement about the radiographic grid is true?

• A. Increases exposure by concentrating photon flux
• B. Reduces scatter by absorbing scattered photons along grid lines
• C. Has no effect on image quality
• D. Grid lines are used to measure exposure time

Answer: (B)

Grids reduce scatter radiation to improve image contrast by absorbing scattered photons before they reach the image receptor. The lead strips capture photons that are deflected from the primary beam, while photons traveling through the interspaces reach the detector, producing a sharper image with higher contrast. This explains why the statement is true: scatter is reduced by absorbing scattered photons along the grid lines. Grids do not concentrate photon flux; they filter and absorb some primary photons too, often requiring higher exposure to maintain receptor exposure. They do affect image quality by reducing scatter, and grid lines are not used to measure exposure time.