Which two grid types are used in mammography?

• A. Linear and Honeycomb
• B. Cross grid and standard grid
• C. Hexagonal grid and circular grid
• D. Double grid and single grid

Answer: (A)

Grids in mammography are used to suppress scattered photons that would blur the image and lower contrast. The two designs most commonly employed are linear (parallel) grids and honeycomb grids. A linear grid has lead strips running in a single direction; this simple, reliable pattern pairs well with the compact, highly compressed breast imaging geometry and is easy to center and position during the exam. A honeycomb grid features a hexagonal (honeycomb) arrangement of the lead strips, which can provide efficient scatter rejection and good contrast over the imaging field, though it often requires more careful alignment and handling. Other grid types, like cross grids or unusual circular or hex patterns that aren’t standard for routine mammography, tend to demand tighter setup and can introduce artifacts or higher sensitivity to misalignment. Thus linear and honeycomb grids are the ones you’re most likely to encounter in mammography.