Patent ID: 7434998

Claim:
An X-ray CT scanner for reconstructing a CT image of a subject, comprising: an X-ray source configured to emit an X-ray beam; an X-ray detector having a plurality of detecting elements and configured to detect X-rays transmitted through the subject; a reconstructing unit configured to reconstruct the CT image based on an output of the X-ray detector; a determining unit configured to allow a user to set a thickness of the X-ray beam to an arbitrary integral multiple of a pitch of the detecting elements, as measured in a body axis direction of the subject, by graphically manipulating a frame representing the ends of the X-ray beam; a control unit configured to generate a calibration data file used to correct projection data obtained using the set X-ray beam thickness, from stored calibration data corresponding to predetermined X-ray beam thicknesses other than the set X-ray beam thickness; and a display unit configured to display a scanogram based on the reconstructed CT image, and to graphically display on the scanogram, the frame representing the ends of the X-ray beam set by the determining unit.