Analysis of stationary grid artifact on computed radiographic image / 中华放射学杂志

ABSTRACT

Objective To analyze sampling frequency and grid density frequency on the computed radiography(CR)system and to develop an effective method to suppress or eliminate grid artifacts.Methods To test grids with different grid-density in combination with IP boards of different specifications. Radiographic images with various qualities were obtained by simulating two kinds of signaling frequencies (namely two kind of grids with different grid densities),and utilizing three kinds of sampling frequencies (6,8,10 pixels/mm).A variety of different simulation images were obtained.Results By comparing simulation images with actual images,it was discovered that correct signaling frequency could be achieved if the sampling frequency were equal to twice the signaling frequency.The obtained image was clear and free of grid artifact.A grid density of