Patent ID: 7649972

Claim:
An X-ray CT apparatus, comprising: an X-ray tube for irradiating a cone beam X-ray; a multidetector; a revolving device for relatively rotating around an imaging object at least one of the X-ray tube and the multidetector; a linear movement device for relatively linearly moving at least one of the X-ray tube and the multidetector from a start point of a relative linear movement to an end point of the relative linear movement with respect to the imaging object; a scanning device for acquiring projection data by performing only the relative rotation for a holding time τ without performing the relative linear movement at the start point of the relative linear movement and/or at the end point of the relative linear movement and performing the relative rotation and the relative linear movement for a relative linear movement range so as to acquire the projection data to use for reconstructing CT images related to the relative linear movement range and an image extension area, wherein the relative linear movement range is a range from the start point of the relative linear movement to the end point of the relative linear movement and the image extension area is an area created outside the relative linear movement range; and an image reconstruction device for generating a CT image related to the relative linear movement range and an image extension area by using the projection data acquired.