Overview
Anti scatter grids placed between patient and detector absorb scattered x rays to improve image contrast. Grid use increases exposure requirements and is selected based on body part thickness. Proper alignment prevents grid cutoff artifacts.
Grid Ratio and Frequency
Higher grid ratios improve scatter rejection but require higher exposure. Grid frequency affects potential moire patterns with digital detectors. Selection balances image quality and dose considerations.
Care and Inspection
Grids must be inspected for damage and cleaned according to manufacturer guidance. Warped or damaged grids produce artifacts and should be replaced. Documentation of grid performance supports QA.
Software Alternatives
Some digital systems use software scatter correction to reduce reliance on physical grids. Hybrid approaches combine hardware and software for optimal results. Validation ensures software corrections maintain diagnostic accuracy.