Patent ID: 6507642
Filing Date: 2003-01-14
Classification: A61B,G21K

Abstract:
A collimator control method, comprising the steps of:forming X-rays emanating from a focus of an X-ray tube into a fan shaped beam by a collimator and projecting said fan shaped beam onto a detector element array comprising a plurality of detector element rows arranged side by side in a thickness direction of said fan shaped beam, each of said detector element rows comprising a plurality of X-ray detector elements disposed in an extent direction of said fan shaped beams; detecting an error between an impingement position of said fan shaped beam and a predetermined impingement position in direction of said side by side arrangement of said detector element rows on said detector array; controlling said collimator based on said detected error so that said impingement position of said ran shaped beam coincides with said predetermined impingement position; and removing high frequency components in said detected error; and wherein said collimator is controlled based on said error after removal of said high frequency components so that said impingement position of said fan shaped beam coincides with said predetermined impingement position.