Patent ID: 8358824

Claim:
An X-ray Computed Tomography (CT) apparatus comprising: an X-ray tube; an X-ray detector comprising a plurality of detector rows; a rotating device configured to rotate said X-ray tube and said X-ray detector about a body axis of a subject; a relative linear moving device configured to relatively linearly move said X-ray tube and said X-ray detector relative to the subject from a relative linear movement start point to a relative linear movement end point; a scan device configured to acquire projection data by executing a resident scan and a moving scan, wherein the resident scan is for acquiring projection data while executing the rotation at at least one of the relative linear movement start point and the relative linear movement end point without executing the relative linear movement and said moving scan is for acquiring projection data while executing the rotation and the relative linear movement within a relative linear movement range; and an image reconstructing device configured to reconstruct CT images including at least one of a first image and a second image using the acquired projection data, wherein reconstruction of the first image is for reconstructing a first CT image at a first slice position located outside the relative linear movement start point of the relative linear movement range, the first CT image is reconstructed using projection data in a view range, the view range corresponding to predetermined view angles that view at the relative linear movement start time or corresponding to a proximal view being in the center thereof, and including a view based on the resident scan and a view based on the moving scan, and when projection data for the image reconstruction lack, using existing projection data based on the moving scan contained in the view range as a substitute for the lacked projection data, and reconstruction of the second image is for reconstructing a second CT image at a second slice position located outside the relative linear movement end point of the relative linear movement range, the second CT image is reconstructed using projection data in a view range, the view range corresponding to predetermined view angles that view at the relative linear movement end time or corresponding to a proximal view being in the center thereof, and including a view based on the resident scan and a view based on the moving scan, and when projection data for the image reconstruction lack, using existing projection data based on the moving scan contained in the view range as a substitute for the lacked projection.