| 摘要 |
PROBLEM TO BE SOLVED: To provide an X-ray CT dissolving a shift in the slice direction without exposing a subject to radiation when detecting the shift. SOLUTION: This X-ray CT is provided with a dedicated shift detector 7 in a beam detecting position in a fan beam end part in a part of a support mechanism 5 supporting an X-ray source 1. The position is closer to the X-ray source than the position of a collimator 6 converting it into the fan beam. In a preliminary exposure, the collimator 6 is closed to make no X-ray exposed to the subject and the dedicated shift detector detects the shift/no-shift and measures its quantity. If there is the shift, a position control part 11 controls the position of a negative electrode of the X-ray source for eliminating it. COPYRIGHT: (C)2005,JPO&NCIPI
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