二维图像的投影和图像重建，直接傅里叶反变换法，先反投影后滤波，先滤波后反投影，卷积反投影(Two dimensional image projection and image reconstruction, direct Fourier inverse method, first backprojection, after filtering, first filter, back projection, convolution back projection)

真实验条件下, 反卷积重建法的速度约是时域重建法的4~6 倍、滤波反投影法(abc eng agc is abc oh what abc)

可以求出在有滤波的情况下 不同的灰度。ct系统的重建过程。(Different gray levels can be found in the case of filtering.)

根据扫描后所得到的吸收点，可进行图像重建，得到原物体的图像(we can use this code to complete the function of picture restruction according to the points which is given .)