验证傅里叶切片定理，可减少傅里叶变换的计算量-fourier slice

Fourier Slice Theorem, Radon Transform

基于傅里叶切片理论，将CT截面图进行三维重建，然后进行任意角度剪切，可用来3D虚拟视点产生(Based on the Fourier slice theory, the CT section is reconstructed in three dimensions, and then the arbitrary angle is cut, which can be used to generate the virtual view of the 3D.)