Single grating phase contrast imaging method and system
A phase contrast imaging, single grating technology, applied in the field of clinical medical imaging and industrial testing, can solve the problems of high cost, high process requirements of grating phase contrast imaging system, low penetration rate, etc., to achieve cost increase, reduce process requirements, reduce effect of time
Active Publication Date: 2020-10-27
UNIV OF SCI & TECH OF CHINA
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[0005] In view of the above technical problems, the purpose of the present invention is to provide a single grating phase contrast imaging method and system to alleviate the technical problems of high process requirements, high cost and low popularity of the grating phase contrast imaging system
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[0053] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. the embodiment. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0054] X-ray phase contrast imaging provides not only traditional absorption information, but also phase information and scattering information of objects. Object phase-contrast images can distinguish soft tissues with small differences in density. X-ray grating phase contrast imaging has undergone two important developments. The introduction of Talbot interferometer in 2002 and 200...
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The invention provides a single-grating phase-contrast imaging method and system. The method comprises the following steps: selecting a light source with a light source target structure period of p<0>, a grating with a grating period of p<1>, and a detector with a pixel size of p, wherein 1 / p<0>+1 / Kp=eta / p<1>, K is larger than or equal to 3, and eta is a known parameter determined according to thegrating type; placing the light source, the grating and the detector on the same light path, wherein the light source is a first distance away from the grating, the grating is a second distance awayfrom the detector, and the second distance is larger than the first distance; placing a sample stage between the light source and the detector, and acquiring a background image; and placing an objectto be imaged on the sample stage, and imaging the object to be imaged to obtain an object image. According to the method, phase-contrast imaging is realized with one grating through single exposure, so that the technical problems of high process requirements, high cost and low popularizing rate in an existing grating phase-contrast imaging system are solved, and the technical effects of lowering the process requirements and cost of the grating phase-contrast imaging system and improving the popularizing rate of the grating phase-contrast imaging system are achieved.
Description
technical field [0001] The invention relates to the technical fields of clinical medical imaging and industrial detection, in particular to a single-grating phase-contrast imaging method and system. Background technique [0002] After more than ten years of development, the grating phase contrast imaging method is considered to be the most promising X-ray phase contrast imaging method for practical application. However, this method still has many limitations. The existing grating phase contrast imaging method usually requires a phase grating and two absorption gratings. In coherent phase contrast imaging, due to the small period of the grating, the processing is difficult, especially in high-energy imaging, the thickness of the absorption grating is large, so the absorption grating with a higher aspect ratio is required, which further increases the process difficulty of the absorption grating. Therefore, resulting in The grating phase contrast imaging system has the proble...
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IPC IPC(8): G01N23/041G01N23/083G01N23/20
CPCG01N23/04G01N23/083G01N23/20083
Inventor 吴朝魏文彬高昆王秋平田扬超陆亚林
Owner UNIV OF SCI & TECH OF CHINA