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

• 作者: Zhe Hu Wen-Qiang Hua Jie Wang
• 来源期刊: 中国物理B（英文版）
• 年，卷（期）: 2021,（6）
• 所属期刊栏目: ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS
• 页码范围: 319-324
• 页数: 6页
• 语种: 英文
• DOI: 10.1088/1674-1056/abee08

摘要

X-ray speckle tracking based methods can provide results with best reported angular accuracy up to 2 urad.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 pattems 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 urad,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.