A continuous sampling scheme for edge illumination x-ray phase contrast imaging
A continuous sampling scheme for edge illumination x-ray phase contrast imaging
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DOI：
10.1063/1.4927729
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发表时间：
2015-08
影响因子：
3.2
通讯作者：
C. Hagen;P. Coan;A. Bravin;A. Olivo;P. Diemoz
中科院分区：
文献类型：
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作者：
C. Hagen;P. Coan;A. Bravin;A. Olivo;P. Diemoz
我们讨论了一种基于物体连续扫描的边缘照明（EI） x射线相位对比成像的替代采集方案，并将其性能与先前使用的方案进行了比较，该方案涉及以离散步骤而不是连续步骤扫描物体。通过在实际实验条件下对连续和离散两种方法的信号进行模拟，分析了空间采样率对图像对比度和检索相移精度等指标的影响。实验结果证实了理论预测。尽管局限于一个具体的例子，结果表明连续方案比离散方案具有优势。它们不仅可以用来加快采集速度，而且在精确相位检索方面也被证明是优越的。本研究提供的理论和实验结果将指导未来EI实验的设计，实现优化的获取策略。
We discuss an alternative acquisition scheme for edge illumination (EI) x-ray phase contrast imaging based on a continuous scan of the object and compare its performance to that of a previously used scheme, which involved scanning the object in discrete steps rather than continuously. By simulating signals for both continuous and discrete methods under realistic experimental conditions, the effect of the spatial sampling rate is analysed with respect to metrics such as image contrast and accuracy of the retrieved phase shift. Experimental results confirm the theoretical predictions. Despite being limited to a specific example, the results indicate that continuous schemes present advantageous features compared to discrete ones. Not only can they be used to speed up the acquisition but they also prove superior in terms of accurate phase retrieval. The theory and experimental results provided in this study will guide the design of future EI experiments through the implementation of optimized acquisition sche...