Patent ID: 8396184

Claim:
An X-ray CT system that performs scanogram imaging and scanning imaging, comprising: an X-ray generating part configured to irradiate X-rays towards a subject; an irradiation field regulating part configured to variably limit an irradiation field of said X-rays to be irradiated; a detection part configured to be positioned facing said X-ray generating part across said subject, and have a plurality of rows of detection elements in a body axial direction, in which a plurality of the X-ray detection elements that detect the transmitted X-rays transmitted through said subject is aligned in a direction perpendicular to the body axis of said subject; a moving part configured to change relative positions between said X-ray generating part, said detection part, and said subject in the body axial direction of said subject; an image generating part configured to generate image data based on said transmitted X-ray detected by said detection part; and a display control part configured to cause a display part to display an X-ray CT image based on said image data; and the X-ray CT system comprising: an imaging region data acquisition part configured to acquire a first imaging region and a second imaging region that have different widths from each other in the body axial direction of said subject based on said scanogram as imaging regions for performing said scan imaging; an irradiation field control part configured to obtain an irradiation field for said first imaging region and an irradiation field for said second imaging region, and control said irradiation field regulating part corresponding to said relative positions by said moving part so as to realize said irradiation fields obtained for each said imaging region; and an X-ray control part configured to control said X-ray generating part corresponding to said relative positions by said moving part so as to irradiate X-rays to said first imaging region and said second imaging region for said scan imaging.