这是一个基于扇形束反投影滤波重建的算法，可用于CT重建。-This is a backprojection filtering reconstruction algorithm, based on the fan-beam CT reconstruction can be used.

CT图像重建 平型射线束 滤波反投影图像重建 -Parallel beam filtered back-projection image reconstruction

CT重建滤波反投影BPF算法，虽然可以用MATLAB直接实现，但原理需要写开代码才能看到。这个是一步一步写出的，但速度慢。(Although the back projection BPF algorithm of CT reconstruction filtering can be directly implemented by MATLAB, the principle needs to be written code to see. It's written step by step, b

CT滤波反投影图像重建算法的反投影计算量问题