解决粉末衍射断层扫描中的几何偏移问题，提升深度应变重构精度。
Parallax in angular sensitive powder diffraction tomography
- 分析衍射信号因深度不同产生的横向偏移机制。
- 发现偏移可叠加修正，且360°旋转下不影响角度信息重建。
- 适用于材料内部应变分布高精度测量的研究者。
尽管已有若干方法用于确定深度分辨的应变分布，但各有局限；而断层扫描在该问题上的应用仍有限。主要挑战之一是几何偏移——由样品不同深度引起的衍射信息在探测器上产生非可忽略的横向偏移。本文研究了偏移的影响，得出两个关键结果：首先，偏移效应与其他偏移源具有可叠加性，意味着可直接校正；其次，在采用全360°旋转的断层扫描中，偏移对角度信息的重建无显著影响。
原文摘要 · Abstract (English)
While a few methods for the determination of depth-resolved strain distributions each with inherent limitations are available, tomographic reconstruction has been applied to this problem in only a limited sense. One of the challenges was the potential impact of geometric parallax, which constitutes a non-negligible lateral offset of diffraction information arising from different sample depths at the detector. Here, the effect of parallax was investigated and two main results have emerged. First, the impact of parallax was found to be additive to other offset contributions, which implies a straightforward correction. Second, for tomographic scans utilizing a full 360° rotation parallax has been found to have no impact on reconstructions of angular information.
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