运用滤波反投影的方法对所输图像进行重建，其中可以对图像的滤波和插值进行选择。-Using filtered back-projection method for the reconstruction of the input images, which can filter and interpolation of images to choose.

对CT图像进行radon变换以及IRADON反变换，并画出弦图，实现环形伪影的仿真-CT images of the radon transform and IRADON inverse transform, and draw the chord diagram to realize the simulation of ring artifacts