Patent ID: 7190758

Claim:
An X-ray CT system comprising an X-ray generation source, and an X-ray detection unit having a plurality of arrays of detectors arranged in a direction of transportation in which a patient couch used to carry a subject is transported, said X-ray CT system comprising: a collimator that forms a slit which limits a range of X-irradiation from said X-ray generation source; an adjusting device for adjusting the position in the direction of transportation of said collimator and the width in the direction of transportation of said slit; a scan control device for performing a scan after said adjusting device adjusts the position in the direction of transportation of said collimator and the width in the direction of transportation of said slit so that direct radiation of X-rays will fall on one of the plurality of arrays of detectors, and for performing the scan relative to each of the plurality of arrays of detectors; a correction data producing device for producing scattered radiation correction data on the basis of data detected by said X-ray detection unit during each scan performed by said scan control device, wherein said correction data producing device calculates a correction coefficient, which represents a ratio of an intensity of scattered radiation to an intensity of direct radiation, relative to each of the plurality of arrays of detectors using each view acquired during each scan performed by said scan control device; a correcting device for correcting projection data, which is acquired by scanning a subject, using the produced scattered radiation correction data, wherein said correcting device calculates, by computing a weighted sum, an intensity of scattered radiation generated during a scan of the subject; and a reconstructing device for reconstructing a tomographic image of the subject on the basis of the projection data corrected by said correcting device.