一種新的CT重建法
A NEW RECONSTRUCTION METHOD FOR COMPUTERIZED TOMOGRAPHY
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摘要: 本文提出一種新的CT重建法非均勻反投影重建法。新方法與通常的均勻反投影重建方法不同,它不是把投影差值均勻地分配給有關象素,而是根據(jù)象素的灰度加權系數(shù)非均勻地分配投影差值。這種新的重建方法使重建象的質量有明顯改善,特別是在投影方向數(shù)較少的非完全投影情況下,改善效果更加明顯。
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關鍵詞:
- CT; 圖象重建; 圖象處理
Abstract: A nonuniform back-projection reconstruction method for computerized tomography is presented. In the uniform back-projection reconstruction method the projection difference-between a measured ray sum and a computed ray sum is uniformly distributed to the cells in the ray, but in the nonuniform back-projection reconstruction method the projection difference is nonuniformly distributed to the cells based on the weighted grey coefficient of the cell. A qualitative improvement of reconstructed images by the new reconstruction method is evident, especially in the incomplete projection cases. -
M. P. Ekstrom, Digital Image Processing Tecliniques, Academic Press, Inc., Orlando, 1984.[2]R. Gordon, R. Bender, G. T. Herman, J. Thero. Biol., 29(1971), 470-481.[3]R. Gordon, IEEE Trans. on NS, NS-21(1974), 78-93. -
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