Patent ID: 6845142

Claim:
An image processing apparatus for processing a plurality of sets of projection data to visualize an internal structure of an object to be imaged, the plurality of sets of projection data being acquired by radiating an X-ray onto the object in a multitude of directions, the apparatus comprising: a plurality of correction tables formed corresponding to different X-ray tube voltages and formed to selectively be used in response to a specified X-ray tube voltage, each correction table defining a correcting value corresponding to a change in density of the contrast agent in a region of the object in which the contrast agent is present; a correcting unit configured to correct the projection data based on the correcting value obtained from any one of the correction tables so as to avoid influence of beam hardening of the projection data, the beam hardening being caused due to a contrast agent injected into the object; and a reconstructing unit configured to reconstruct the corrected projection data into an image of the object.