Patent ID: 6322248
Filing Date: 2001-11-27
Classification: A61B,G21K,H05G

Abstract:
An X-ray impinging position alignment method used perform tomographic imaging by scanning a subject positioned on a gantry using an X-ray emitting/detecting apparatus which emits an X-ray beam generated by an X-ray tube onto an X-ray detector through a collimator, said method comprising the steps of:obtaining at least two of the following: temperature of said X-ray tube, tilt angle of said gantry, scan time, focus size of said X-ray beam, and azimuth of said X-ray beam;calculating an X-ray focus shift at said X-ray tube based on said at least two of said temperature, tilt angle, scan time, focus size and azimuth; andproviding an offset distance of said collimator and/or said X-ray detector according to said calculated shift so that said X-ray beam coincides with a predetermined position on said X-ray detector.