X-ray CT scanner, image generation method, and image generation program

An X-ray CT system comprising,

• a raw data acquisition part configured to acquire raw data obtained by applying X-rays to a subject placed in imaging space and by detecting a distribution of X-ray strength passing through the subject, the raw data being associated with multiple views at different X-ray irradiation angles to the subject,
• an image reconstructor configured to apply a smoothing process to the raw data associated with multiple views, followed by image reconstruction to obtain a smoothed image of a predetermined region to be imaged in the imaging space,
• a sharpening processor configured to apply more intense sharpening to pixels in a region of a central part of the subject in the smoothed image, than to pixels in a region of a peripheral part of the subject, and
• a subject model generator configured to create a subject model that represents a form and position of the subject in the region to be imaged, in an approximate manner, by using one or more predetermined shapes and the position thereof,
• wherein the sharpening processor brings the subject model into correspondence with the smoothed image, and applies more intense sharpening to pixels in the region of the smoothed image corresponding to the region of the central part of the predetermined shape of the subject model, than to pixels in the region of the smoothed image corresponding to the region of the peripheral part of the predetermined shape.