Patent ID: 6568851
Filing Date: 2003-05-27
Classification: A61B

Abstract:
An X-ray CT scanner comprising:an X-ray tube configured to irradiate an object to be examined with X rays; a variable X-ray limiting device configured to limit the beam thickness of the X rays; an X-ray detector configured to detect X rays transmitted through the object and has a plurality of detecting elements arrayed in a matrix manner; a storing unit configured to store a plurality of calibration data files corresponding to a plurality of beam thicknesses; a correcting unit configured to correct an output from said X-ray detector on the basis of at least one calibration data file read out from said storing unit; a reconstructing unit configured to reconstruct image data concerning the object on the basis of an output from said correcting unit; and a control unit configured to control said variable X-ray limiting device to change the beam thickness of the X rays, independently of the plurality of beam thicknesses to which the plurality of calibration data files stored correspond.