X-ray grating differential phase contrast imaging method and device based on two-dimensional dislocation absorption grating

An absorption grating and differential phase technology, applied in the field of X-ray imaging, can solve the problems of large dose, undiscovered X-ray grating differential phase contrast imaging method and device, long imaging time, etc.

CN108469443AInactive Publication Date: 2018-08-31BEIHANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2018-08-31
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses an X-ray grating differential phase contrast imaging method and device based on a two-dimensional dislocation absorption grating. The method comprises the following steps: arranging a Talbot-Lau imaging structure according to a novel two-dimensional dislocation absorption grating provided in the invention; acquiring a two-dimensional intensity image of X rays passing through an object by virtue of the previous structure; and separating three images from the acquired two-dimensional intensity image by a Fourier analysis method, namely an X-ray absorption contrast image,a differential phase contrast image and a scattering contrast image. Compared with the traditional method, the method in the embodiment of the invention has the advantages that the grating does not need to be moved, the three contrast images can be acquired by virtue of single exposure, the imaging time is greatly shortened, the imaging dose is reduced, and the imaging efficiency and stability ofthe system are improved.
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Description

technical field

[0001] The invention relates to the technical field of X-ray imaging, in particular to an X-ray grating differential phase contrast imaging method and device based on a two-dimensional dislocation absorption grating. Background technique

[0002] In the X-ray imaging system, the X-ray source emits X-rays and illuminates a certain area of ​​the object to be detected. The detector placed opposite the X-ray source converts the X-ray signal attenuated by the object into a digital signal and sends it to the computer, thus forming 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 of low atomic number material structure samples. In recent years, phase-contrast imaging techniques have been proposed to impr...

Examples

Embodiment Construction

[0076]The present invention will be 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; To solve 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 this method are as follows:

[0078] Step S101, placing each device according to the requirements of Talbot-Lau imaging optical path parameters.

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

[0080]

[0081] kg 1 = 2g 2 , (2)

[0082] g 0 =g 2 L / d, (3)

[0083] s2 · L / 2d, (4)

[0084] Among them, d represents the distance between the phase grating G1 and the ...