| 摘要 |
An X-ray computed tomography apparatus includes an X-ray tube (101) which generates X-rays, a multi-channel X-ray detector (103) which detects X-rays transmitted through an object to be examined, a rotating frame (102) which is equipped with the X-ray tube and the X-ray detector, a reconstruction unit (114) which reconstructs an image on the basis of an output from the X-ray detector, and a control unit (121) which alternately shifts the X-ray focal spot of the X-ray tube along the rotating direction on the anode by a distance +sigma and a distance -sigma for each view. The distance sigma is set to sigma = S O D . tan ( Delta beta 2 ) where SOD is the distance between the X-ray tube and the rotation center, and Deltabeta is the angle difference between adjacent views, such that X-ray focal spots in the adjacent views overlap each other at almost the same position.
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