In order to provide a CT image with high-spatial resolution and a CPR image without deterioration due to interpolation by scanning while always moving a site of interest of an object to the scanning center, a bed on which the object is placed is moved in a direction orthogonal to the body-axis direction of the object or a scanner angle is changed when scanning the object while moving it in a direction crossing the rotation direction i.e., the body-axis direction of the object, during the rotation of a rotary disk where a radiation source and a radiation detector are disposed oppositely. Image reconstruction is performed using bed movement information (movement information in a direction orthogonal to the body-axis direction) or scanner angle information during scanning.
