X-ray grating differential phase contrast imaging method and device based on laterally dislocated absorption grating

Abstract

The invention discloses a transverse dislocated absorption grating-based X ray grating differential phase contrast imaging method and device. The method comprises the following steps: arranging a Talbot-Lau imaging structure by the novel transverse dislocated absorption grating disclosed by the invention; acquiring the two-dimensional intensity image after X ray penetrates through an object by the imaging structure; and separating the X ray absorption contrast image, differential phase contrast image and scattering contrast image from the acquired two-dimensional intensity image by the Fourier analysis method. Compared with the traditional method, the embodiment of the invention does not need to move the grating, three types of contrast images can be obtained by single exposure, so the imaging time is greatly shortened, the imaging dose is reduced and the imaging efficiency and stability of a system are improved.

Description

technical field [0001] The invention relates to the technical field of X-ray imaging, in particular to a method and device for X-ray grating differential phase contrast imaging based on a laterally dislocated absorption grating. Background technique [0002] In the X-ray imaging system, the X-ray source emits X-rays, which transilluminate a certain area of ​​the object to be detected, and the detector placed opposite the ray source converts the ray signal attenuated by the object into a digital signal and sends it to the computer to form a digital signal. The transillumination intensity image of an object can non-destructively characterize the medium density, composition and structural morphology of the object in this area. [0003] Traditional X-ray imaging can only obtain absorption contrast imaging of objects, and it is difficult to obtain high-contrast images for low atomic number material structure samples. In recent years, phase contrast imaging techniques have been p...

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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 imaging method and device based on laterally dislocated absorption gratings have been found

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