非均匀反投影重建方法
A Nonuniform Back-Projection Reconstruction Method
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摘要: 本文提出了一种新的计算机断层象(CT)的重建方法--非均匀反投影重建法.该方法 是根据射线上各象元灰度的大小对投影差值进行非均匀加权分配的,而不是采用传统重建方 法中的均匀分配.这种重建方法较好地消除了重建图象中普遍存在的干涉条纹,可明显改善 图象质量.特别是在只有少数几个投影方向数据的非完全投影情况下,该方法效果更好.Abstract: A new nonuniform back-projection reconstruction method for Computerized Tomography is presented. The method means that the projection differences on a ray will make nonuniform distribution to the cells on the ray weighted by the gray levels of the cells, instead of the uniform distribution in the general reconstruction method. The new reconstruction method strongly reduces the Moire artifacts and improves the quality of the reconstructed images, especially in the case in which there are few projection direction data called incomplete projection.
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Key words:
- Computerized tomography(CT) /
- image reconstruction /
- image processing
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