Real time high accuracy phase contrast imaging with parallel acquisition speckle tracking*

被引:0
|
作者
Hu, Zhe [1 ,2 ]
Hua, Wen-Qiang [1 ,3 ]
Wang, Jie [1 ,3 ]
机构
[1] Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[3] Chinese Acad Sci, Shanghai Adv Res Inst, SSRF, Shanghai 201204, Peoples R China
基金
中国国家自然科学基金;
关键词
phase contrast imaging; near field speckle; grating splitter; TOMOGRAPHY; RESOLUTION; RETRIEVAL; NOISE;
D O I
10.1088/1674-1056/abee08
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
X-ray speckle tracking based methods can provide results with best reported angular accuracy up to 2 nrad. However, duo to the multi-frame requirement for phase retrieval and the possible instability of the x-ray beam, mechanical and background vibration, the actual accuracy will inevitably be degraded by these time-dependent fluctuations. Therefore, not only spatial position, but also temporal features of the speckle patterns need to be considered in order to maintain the superiority of the speckle-based methods. In this paper, we propose a parallel acquisition method with advantages of real time and high accuracy, which has potential applicability to dynamic samples imaging as well as on-line beam monitoring. Through simulations, we demonstrate that the proposed method can reduce the phase error caused by the fluctuations to 1% at most compared with current speckle tracking methods. Meanwhile, it can keep the accuracy deterioration within 0.03 nrad, making the high theoretical accuracy a reality. Also, we find that waveforms of the incident beam have a little impact on the phase retrieved and will not influence the actual accuracy, which relaxes the requirements for speckle-based experiments.
引用
收藏
页数:5
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