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

Abstract

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.

Description

Technical field [0001] The present invention relates to the field of X-ray computer chromatography imaging, and more particularly to an X-ray grating differential phase liner having a lateral misalignment grating, a three-dimensional tapered computer chromatographic imaging method and apparatus. Background technique [0002] In the X-ray computer chromatographic imaging (CT) system, the X-ray source is emitted, and the detector placed opposite the side of the radio source is received at the respective angle from a certain area of ​​the detected object from a different angle. Then, according to the different degrees of attenuation of each angular ray, a certain reconstruction algorithm and a computer are used to reconstruct the radio line attenuation coefficient distribution map image of the object being scanned area, thereby implementing the image reconstructed image, non-destructive reproduction object in this area Features of dielectric density, ingredients, and structural morp...

AI Technical Summary

Problems solved by technology

[0004] However, most of the existing differential phase contrast methods based on gratings are traditional methods based on the translation and stepping of absorption gratings. The imaging time is long, the dose is large, the stability is low, and the efficiency is not high, which restricts its further engineering application.

[0005] At present, no X-ray grating differential phase contrast three-dimensional cone-beam computed tomography device based on laterally dislocated absorption gratings has been found

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