| 摘要 |
PROBLEM TO BE SOLVED: To keep a slice thickness of a tomogram of an X-ray CT apparatus as constant as possible in an xy plane. SOLUTION: After a row direction filter of an X-ray detector with a filter coefficient adjusted for every channel is overlapped on projection data before three-dimensional back projection, three-dimensional back projection is performed on the projection data, and the image reconstruction is performed to control the slice thickness of the tomogram depending on a distance from a center in the XY plane. The image quality of the tomogram is controlled by controlling to keep the slice thickness as constant as possible irrespective of the distance from the center. The density of the distance between data on the reconstruction plane of the X-ray detector data or the projection data projected on the reconstruction plane is controlled by creating virtual projection data to improve the image quality of the tomogram. COPYRIGHT: (C)2007,JPO&INPIT
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