A partial-dithering strategy for edge-illumination x-ray phase-contrast tomography enabled by a joint reconstruction method.
A partial-dithering strategy for edge-illumination x-ray phase-contrast tomography enabled by a joint reconstruction method.
复制标题
通过联合重建方法实现边缘照明 X 射线相衬断层扫描的部分抖动策略。
DOI：
10.1088/1361-6560/ab66e2
复制
发表时间：
2020
影响因子：
3.5
通讯作者：
Chen Y
中科院分区：
文献类型：
--
作者：
Chen Y
边缘照明X射线相衬层析成像（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，以估计复值折射率的分布。EIXPCT分辨率主要由样本掩模的周期决定，但可以通过抖动技术显著提高。这里，抖动意味着随着对象在子像素距离上移动，每个断层摄影视角获取多个图像。抖动的缺点包括增加数据采集时间和辐射剂量。最近开发的联合重建方法，使数据采集设计的灵活性，一种新的部分抖动策略的EIXPCT数据采集的启发。在该策略中，仅在断层摄影视角的子集处实现抖动。该策略可以导致与常规全抖动策略的空间分辨率相当的空间分辨率，其中抖动在每个视角处执行，但是采集时间显著减少。在这里，抖动参数对图像分辨率的影响进行了探讨。
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.