实现了标准shepp-logan三维图形的重建，程序采用经典的代数替代重建算法-achieve the standard shepp- logan 3D reconstruction, procedures used to replace the classical algebraic reconstruction algorithm

在Matlab图像处理工具箱中的Phantom函数，可以产生Shepp－Logan的大脑图,利用RADON变换重建图像-In the Matlab Image Processing Toolbox functions in the Phantom can generate Shepp-Logan brain map, the use of RADON transform image reconstruction