Patent ID: 8792610

Claim:
An apparatus for X-ray CT imaging, comprising: an X-ray irradiation unit configured to irradiate an X-ray toward a subject; an X-ray detector having a plurality of X-ray detection elements along a channel direction and a row direction; a couch on which the subject can be arranged; a rotation unit on which the X-ray irradiation unit is disposed and rotates around the couch; a controller configured to execute a helical scan while fluctuating an X-ray focal spot along a body axis direction of the subject by controlling the X-ray irradiation unit; and an image processing unit configured to generate a reconstructed image based on data acquired by the helical scan, wherein the controller is further configured to set a magnitude of fluctuation of the X-ray focal spot based on a distance between the X-ray focal spot and a rotation center axis, a distance between the X-ray focal spot and a center of the X-ray detector, and a pitch of the plurality of X-ray detection elements.