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

An absorption grating and lateral dislocation technology, applied in the field of X-ray imaging, can solve the problems of restricting engineering applications, low efficiency, low stability, etc.

CN107144581BActive Publication Date: 2019-09-27BEIHANG UNIV
5 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2019-09-27

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

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.
Need to check novelty before this filing date? Find Prior Art

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...

Examples

Embodiment Construction

[0076] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0077] figure 1 The flow chart of the X-ray grating differential phase contrast imaging method based on the laterally dislocated absorption grating provided by the embodiment of the present invention; the embodiment of the present invention is aimed at the existing grating differential phase contrast imaging process that requires multiple exposures, long imaging time, and imaging Due to the problems of large dose and low imaging efficiency, an X-ray grating differential phase contrast imaging method based on laterally dislocated absorption grating is provided. The specific steps of the method are as follows:

[0078] Step S101, placing the devices according to the Talbot-Lau imaging optical path parameter requirements.

[0079] The optical path parameters of the Talbot-Lau imaging structure should satisfy the following formulas (1)-(4):

[0080] ...