Grids that have strips angled to coincide with divergence of the x-ray beam are called:

Grids that have strips angled to coincide with divergence of the x-ray beam are called:

• A. Parallel
• B. Crosshatch
• C. Focused
• D. Rhombic

Answer: (C)

Focused grids have the lead strips tilted to align with the divergent x-ray beam. Because the beam fans out from the focal spot, the strips are shaped so they converge toward a focal point, matching that divergence. This arrangement keeps the primary photons passing through the gaps rather than being absorbed by the strips at the edges, which reduces grid cutoff and maintains uniform exposure across the image when the grid is used at its designated focal distance. If the setup isn’t at the correct focal distance, or the grid isn’t aligned, you’ll see grid cutoff at the edges. Parallel grids don’t have that tilt and can show edge cutoff due to beam divergence; crosshatched and other terms refer to different grid constructions that don’t specifically match the beam’s divergence.

Focused grids have the lead strips tilted to align with the divergent x-ray beam. Because the beam fans out from the focal spot, the strips are shaped so they converge toward a focal point, matching that divergence. This arrangement keeps the primary photons passing through the gaps rather than being absorbed by the strips at the edges, which reduces grid cutoff and maintains uniform exposure across the image when the grid is used at its designated focal distance. If the setup isn’t at the correct focal distance, or the grid isn’t aligned, you’ll see grid cutoff at the edges. Parallel grids don’t have that tilt and can show edge cutoff due to beam divergence; crosshatched and other terms refer to different grid constructions that don’t specifically match the beam’s divergence.