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PROBLEM TO BE SOLVED : To suitably perform beam hardening correction when generating tomograms by dual energy photographing. SOLUTION : On the basis of the ratio of the CT values of corresponding pixels between two kinds of tomograms different in X-ray tube voltage in photographing, a material image corresponding to a predetermined material in the tomograms is extracted (S3), and the extracted material image is virtually projected again (S4). Obtained re-projection data are worked according to the kind of the material and the X-ray tube voltage in photographing (S5), and image reconstitution is performed on the basis of the worked re-projection data (S6). The original tomogram and the newly obtained new material image are subjected to weighted addition to generate a new tomogram (S7). Consequently, the image of the material to be corrected is extracted precisely, and beam hardening correction suitable to the image is suitably performed. COPYRIGHT : (C)2010, JPO&INPIT