| 摘要 |
A method for reprojecting images (32, 76) into sinograms (74, 112) includes the steps of recursively dividing a two-dimensional image (32, 76) into sub-images (34, 36, 38, 40) (78, 80, 82, 84) as small as one pixel and reprojecting the sub-images at the same or a smaller number of orientations to form subsinograms (42, 44, 46, 48) (86, 88, 90, 92). These subsinograms (42, 44, 46, 48)(86, 88, 90, 92) are then successively aggregated and processed to form a full sinogram (74, 112). The method uses two algorithms to aggregate the sub - sinograms. In one algorithm, the aggregation is exact, and in the other algorithm, aggregation is an approximation. The first algorithm is accurate, but relatively slow, and the second algorithm is faster, but less accurate. By performing some aggregations with the exact algorithm and some aggregations with the approximate algorithm, switching between the two algorithms in one of a numb er of suitable ways, an accurate result can be obtained quickly.
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