Patent ID: 7349520

Claim:
An X-ray CT scanner comprising: a device configured to acquire projection data for a three-dimensional region of a subject; an extracting device configured to extract projection data of a plurality of specified slice planes partially from the acquired projection data for the three-dimensional region of the subject; a positioning-image generation device configured to generate a plurality of positioning images at intervals on the basis of the extracted projection data; a display device configured to display the positioning images; a section setting device configured to set a section in a desired direction intersecting the displayed positioning images in accordance with an instruction of an operator; a device configured to specify a plurality of partial reconstruction portions at intervals in regions in the vicinity of where said positioning images intersect the set section; a device configured to generate a plurality of partial images for the plurality of partial reconstruction portions on the basis of the acquired projection data; and a device configured to generate an image for the section on the basis of the plurality of partial images, wherein the plurality of positioning images are arranged at intervals larger than those of the plurality of partial images.