| 摘要 |
For the purpose of determining an offset of the position of an X-ray tube from a prespecified position, and correcting axially projected data D1 and pixel projection data D2 based on the determined offset, proper axially projected data D1 can be obtained by an X-ray focal spot 2102 and a detector 2103 by determining axially projected data D1 at a point 2104 using projection data D0 obtained by a channel that detects an X-ray emitted from the X-ray focal spot 2102 and passing through the point 2104, and shifting the determined axially projected data D1 by a distance DIS1 in the (+)-direction of the x-axis. On the other hand, taking an example of y=Ye/2 (y=r1-r2), and when determining proper pixel projection data D2 at y=r1-r2 by the X-ray focal spot 2102 and the detector 2103, offset correction processing which shifts pixel projection data D2 at a point 2106 in the (+)-direction of the x-axis by a distance DIS2 between points 2106 an 2107 (i.e., an offset) may be similarly conducted.
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