Patent ID: 7889833

Claim:
An X-ray tomography apparatus comprising: a scan device configured to direct X-rays through a subject while at least one of a gantry and a table is moved along a body-axis direction of the subject to create projection data of the subject; a first artifact determination unit configured to identify at least one pixel of a plurality of pixels as artifact based on a change in a computed tomography (CT) value between a first tomographic image of a plurality of tomographic images and a second tomographic image of the plurality of tomographic images in the body-axis direction, the plurality of tomographic images obtained by backprojecting the projection data; a second artifact determination unit configured to set a decision pixel area containing the at least one pixel identified as artifact as a target pixel and areas lying around the target pixel in at least one tomographic image of the plurality of tomographic images, and to re-identify the target pixel as artifact based on a comparison to a first predetermined reference; and an artifact reduction unit configured to perform an image process for reducing artifact on the at least one pixel that is re-identified as artifact.