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

单雨征 ¹葛永帅 ²杨君 ³郭大育 ¹蔡学宝 ⁴刘晓珂 ⁵侯晓文 ⁶郭金川¹

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作者信息

1. 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,Shenzhen 518060,China
2. Research Center for Medical Artificial Intelligence,Shenzhen Institutes of Advanced Technology,Chinese Academy of Sciences,Shenzhen 518055,China
3. Institute of Advanced Science Facilities,Shenzhen 518107,China
4. Institute of Electronic Paper Displays,South China Academy of Advanced Optoelectronics,South China Normal University,Guangzhou 510006,China
5. College of Biophotonics,South China Normal University,Guangzhou 510631,China
6. 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,Shenzhen 518060,China;MinFound Medical Systems Co.,Ltd.,Hangzhou 310018,China
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Abstract

Dual-phase and three-phase grating x-ray interference is a promising new technique for grating-based x-ray differen-tial 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 interferom-eter 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 grat-ing 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.

Key words

x-ray phase contrast/phase grating/moiré fringe

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基金项目

LingChuang Research Project of China National Nuclear Corporation()

国家自然科学基金(12027812)

出版年

2024

中国物理B(英文版)

中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI

影响因子：0.995

ISSN：1674-1056

参考文献量33

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