基于FBP的迭代算法研究

在用传统的滤波反投影算法（FBP）重建图像时,往往不可避免地出现许多伪影。为了减少伪影,论述了一种基于FBP的迭代算法,此处投影采用平行光束。算法分为三个过程,第一个过程采用FBP算法重建图像,第二个过程将重建后的图像再次投影并与第一次的投影做外差并将此差值做反投影获得改进量,第三个过程将改进量与第一次重建的图像相加获得修正后的图像,重复该过程。多次迭代后图像膺像明显减少,图像质量增强。

Research on the iterative algorithm based on FBP

The traditonal algorithm of tilted back projection generates a lot of artifacts inevitably. In order to reduce the artifacts, this article discusses on a kind of iterative algorithm based on FBP. It uses the parallel beams here. The first process uses the FBP algorithm to reconstruct the image. The second process does for the projection of the rebuilded image again and do the subtraction of two projections to get the difference and do the back-projection of this difference to get the improvement. The third process add the improvement to the first rebuilded image to get the revised image. It repeats these three processes, the artifacts decrease abviously and the quality of the image is enhanced.