METHODS AND APPARATUS FOR CORRECTING FOR X-RAY BEAM MOVEMENT

摘要

The present invention, in one form, is a system (80) which, in one embodiment, corrects for position errors of an X-ray beam (16) caused by dynamic movement and thermal drift of the imaging system (10). More specifically, signals from a detector array (18) are utilized to determine a dynamic movement error to correct for errors caused by the rotation of a gantry (12) and a thermal drift error to correct for imaging system X-ray beam movement errors. In one embodiment, a pre-patient collimator (100) is utilized to alter the z-axis position of the X-ray beam (16) as determined by the dynamic movement and the temperature error profiles.