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Chin. Phys. B, 2021, Vol. 30(6): 064201    DOI: 10.1088/1674-1056/abee08

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

Zhe Hu(胡哲)1,2, Wen-Qiang Hua(滑文强)1,3, and Jie Wang(王 劼)1,3,†
1 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China;
3 SSRF, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, China
Abstract  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.
Keywords:  phase contrast imaging      near field speckle      grating splitter  
Received:  21 January 2021      Revised:  09 March 2021      Accepted manuscript online:  12 March 2021
PACS:  42.30.-d (Imaging and optical processing)  
  42.30.Ms (Speckle and moiré patterns)  
  42.30.Rx (Phase retrieval)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11675253 and 11505278).
Corresponding Authors:  Jie Wang     E-mail:

Cite this article: 

Zhe Hu(胡哲), Wen-Qiang Hua(滑文强), and Jie Wang(王 劼) Real time high accuracy phase contrast imaging with parallel acquisition speckle tracking 2021 Chin. Phys. B 30 064201

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