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Theory and verification of moiré fringes for x-ray three-phase grating interferometer

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【作者】 单雨征； 葛永帅； 杨君； 郭大育； 蔡学宝； 刘晓珂； 侯晓文； 郭金川；

【Author】 Yu-Zheng Shan;Yong-Shuai Ge;Jun Yang;Da-Yu Guo;Xue-Bao Cai;Xiao-Ke Liu;Xiao-Wen Hou;Jin-Chuan Guo;Key Laboratory of Optoelectronic Devices and Systems of the Ministry of Education, Key Laboratory of Optoelectronic Devices and Systems of the Department of Education, Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University;Research Center for Medical Artificial Intelligence, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences;Institute of Advanced Science Facilities;Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University;College of Biophotonics, South China Normal University;Min Found Medical Systems Co., Ltd.;

【通讯作者】 葛永帅;郭金川;

【机构】 Key Laboratory of Optoelectronic Devices and Systems of the Ministry of Education, Key Laboratory of Optoelectronic Devices and Systems of the Department of Education, Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University； Research Center for Medical Artificial Intelligence, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences； Institute of Advanced Science Facilities； Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University； College of Biophotonics, South China Normal University； Min Found Medical Systems Co., Ltd.；

【摘要】 Dual-phase and three-phase grating x-ray interference is a promising new technique for grating-based x-ray differential phase contrast imaging. Dual-phase grating interferometers have been relatively completely studied and discussed. In this paper, the corresponding imaging fringe formula of the three-phase grating interferometer is provided. At the same time, the similarities and differences between the three-phase grating interferometer and the dual-phase grating interferometer are investigated and verified, and that the three-phase grating interferometer can produce large-period moiré fringes without using the analyzing grating is demonstrated experimentally. Finally, a simple method of designing three-phase grating and multi-grating imaging systems from geometric optics based on the thin-lens theory of gratings is presented. These theoretical formulas and experimental results provide optimization tools for designing three-phase grating interferometer systems.

【Abstract】 Dual-phase and three-phase grating x-ray interference is a promising new technique for grating-based x-ray differential phase contrast imaging. Dual-phase grating interferometers have been relatively completely studied and discussed. In this paper, the corresponding imaging fringe formula of the three-phase grating interferometer is provided. At the same time, the similarities and differences between the three-phase grating interferometer and the dual-phase grating interferometer are investigated and verified, and that the three-phase grating interferometer can produce large-period moiré fringes without using the analyzing grating is demonstrated experimentally. Finally, a simple method of designing three-phase grating and multi-grating imaging systems from geometric optics based on the thin-lens theory of gratings is presented. These theoretical formulas and experimental results provide optimization tools for designing three-phase grating interferometer systems.

【关键词】 x-ray phase contrast； phase grating； moir′e fringe；
【Key words】 x-ray phase contrast； phase grating； moir′e fringe；
【基金】 Project supported by LingChuang Research Project of China National Nuclear Corporation;the National Natural Science Foundation of China (Grant No. 12027812)
  • 【文献出处】 Chinese Physics B ,中国物理B , 编辑部邮箱 ,2024年05期
  • 【分类号】O434.1;TP391.41
  • 【下载频次】1
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