Three-dimensional cone-beam computed tomography method and device based on laterally misaligned gratings

The invention discloses an X-ray grating differential phase contrast three-dimensional cone-beam computer tomography method and device based on a laterally dislocated grating. The method includes: arranging a Talbot-Lau three-dimensional cone-beam tomography structure with a laterally dislocated absorption grating; The two-dimensional intensity image sequence after the X-ray passes through the object is obtained with the above structure; the X-ray absorption contrast, differential phase contrast and scattering contrast are separated from the collected two-dimensional intensity image by Fourier analysis. Image sequence: Using the absorption contrast, differential phase contrast and scattering contrast filter back projection reconstruction algorithms to reconstruct the three contrast image sequences to obtain the three contrast CT slice images of the object. The invention does not need to step the absorption grating, and can obtain three kinds of contrast CT slice images with the traditional X-ray attenuation-based CT scanning method, which greatly reduces the imaging time, reduces the imaging dose, and improves the imaging efficiency and stability of the system sex.