医学图像三维重建算法中比较简单使用的fdk算程序，该程序使用S-L滤波函数-The use of relatively simple FDK program for calculation of 3D reconstruction of medical images, the program uses the S-L filter function

CT反投影重建的R-L滤波函数与S-L函数，应用对象为matlab自带shepp-logan模型图像(R-L function and S-L function applying to CT backproject reconstruction)