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

doi:10.1088/1674-1056/abee08

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: wangjie@zjlab.org.cn

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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