Grating imaging system and scanning method thereof

Abstract

The invention discloses a grating imaging system, wherein the system comprises: a source grating (G0) for converting incoherent light emitted by a light source into coherent light; a first grating (G1) formed by splicing a plurality of first grating units and used for obtaining first imaging after the coherent light passes through the first grating (G1); and a second grating (G2) formed by splicing a plurality of second grating units and used for operating the first imaging to obtain second imaging, wherein an imaging irradiation site is arranged between the first grating (G1) and the second grating (G2), and the source grating (G0), the first grating (G1) and the second grating (G2) form an optical path to form the system. The system allows the whole scanning time to be reduced to a levelclose to that of a clinical X-ray chest film while good image quality is maintained, and the radiation dose is well controlled; in summary, the large-field grating imaging system has the advantages of large imaging field, high scanning speed, low radiation dose and the like.

Description

technical field [0001] The invention relates to the technical field of optical imaging, in particular to a grating imaging system and a scanning method thereof. Background technique [0002] X-ray grating phase-contrast imaging technology can realize local structure resolution on micron or submicron level, which is a good supplement to traditional X-ray imaging technology. This technology can simultaneously extract three kinds of information of absorption, phase contrast and dark field images, and is suitable for the distinction between low atomic number and low density substances, especially for biological soft tissue structures including breast. In order to obtain better image quality, grating imaging technology usually acquires data by phase stepping. This method refers to displacing one of the gratings along the direction perpendicular to the grid line of the grating in one or more cycles, so as to obtain the displacement curve before and after placing the object. [0...

AI Technical Summary

Problems solved by technology

A larger imaging field of view also means a larger grating group, and the current grating manufacturing process cannot be processed in one go

Similarly, for the traditional grating imaging method, the measured object is generally scanned by moving relative to the grating, and the scanning process is more complicated; in addition, the traditional phase step scanning is time-consuming, and the radiation dose is high, which is harmful to the measured object.

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