| 摘要 |
The present invention provides an X-ray tomography apparatus that positively extracts artifacts without decreasing directional resolution thereby to reduce the artifacts. The X-ray tomography apparatus includes scan device for exposing X rays to a subject while at least one of a gantry and a table is being moved along a body-axis direction of the subject, thereby to create projection data of the subject, CT value change specifying device for specifying the amount of change in CT value in the body-axis direction between a plurality of tomographic images obtained by backprojecting the projection data, with respect to each of pixel areas contained in the tomographic images, image processing condition selecting device for selecting an image processing condition for performing an image process for reducing artifacts, according to the specified amount of change in CT value, and artifact reducing device for performing an image process using the image processing condition selected by the image processing condition selecting device.
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