Edge-illumination x-ray phase-contrast tomography (EIXPCT) is a promising imaging technology where partially opaque masks are utilized with laboratory-based x-ray sources to estimate the distribution of the complex-valued refractive index. EIXPCT resolution is mainly determined by the period of a sample mask, but can be significantly improved by a dithering technique. Here, dithering means that multiple images per tomographic view angle are acquired as the object is moved over sub-pixel distances. Drawbacks of dithering include increased data-acquisition times and radiation doses. Motivated by the flexibility in data-acquisition designs enabled by a recently developed joint reconstruction method, a novel partial-dithering strategy for EIXPCT data-acquisition is proposed. In this strategy, dithering is implemented at only a subset of the tomographic view angles. The strategy can result in spatial resolution comparable to that of the conventional full-dithering strategy, where dithering is performed at every view angle, but the acquisition time is substantially decreased. Here, the effect of dithering parameters on image resolution is explored.

中文翻译：

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通过联合重建方法实现的边缘照明X射线相衬层析成像的局部抖动策略。

边缘照明X射线相衬断层扫描（EIXPCT）是一种很有前途的成像技术，其中部分不透明的掩模与基于实验室的X射线源一起使用，以估计复数值折射率的分布。EIXPCT分辨率主要由样本掩码的周期决定，但可以通过抖动技术显着提高。在此，抖动意味着当对象在子像素距离上移动时，每个断层摄影视角会获取多个图像。抖动的缺点包括增加了数据采集时间和辐射剂量。受最近开发的联合重建方法支持的数据采集设计灵活性的启发，提出了一种用于EIXPCT数据采集的新型局部抖动策略。在这个策略中 仅在断层摄影视角的子集上实现抖动。该策略可以产生与传统全抖动策略相当的空间分辨率，在常规全抖动策略中，每个视角都执行抖动，但是采集时间大大减少。在这里，探讨了抖动参数对图像分辨率的影响。