Patent ID: 7606345

Claim:
An X-ray CT apparatus, comprising: a gantry rotating device comprising an X-ray generator configured to generate an X-ray, and an X-ray detector configured to detect the X-ray generated by said X-ray generator and transmitted through a subject; a cradle configured to carry the subject thereon; a gantry controller configured to perform a helical shuttle scan for relatively reciprocally moving said gantry rotating device and said cradle; a scan condition setting device configured to set a scan condition of the helical shuttle scan in a predetermined range in a direction of body axis of the subject; an X-ray projection data acquisition device configured to acquire X-ray projection data obtained by the helical shuttle scan; a scan controller configured to control the helical shuttle scan as set in accordance with the scan condition; and an image reconstruction device configured to perform an image reconstruction processing based on the X-ray projection data acquired by said X-ray projection data acquisition device.