Levine Zachary H, Garboczi Edward J, Peskin Adele P, Ekman Axel A, Mansfield Elisabeth, Holm Jason D
Opt Express. 2021 Jan 18;29(2):1788-1804. doi: 10.1364/OE.414398.
A reconstruction algorithm for partially coherent x-ray computed tomography (XCT) including Fresnel diffraction is developed and applied to an optical fiber. The algorithm is applicable to a high-resolution tube-based laboratory-scale x-ray tomography instrument. The computing time is only a few times longer than the projective counterpart. The algorithm is used to reconstruct, with projections and diffraction, a tilt series acquired at the micrometer scale of a graded-index optical fiber using maximum likelihood and a Bayesian method based on the work of Bouman and Sauer. The inclusion of Fresnel diffraction removes some reconstruction artifacts and use of a Bayesian prior probability distribution removes others, resulting in a substantially more accurate reconstruction.
开发了一种用于部分相干X射线计算机断层扫描（XCT）的重建算法，该算法包括菲涅耳衍射，并将其应用于光纤。该算法适用于基于管的高分辨率实验室规模的X射线断层扫描仪器。计算时间仅比投影对应物长几倍。该算法用于使用基于Bouman和Sauer工作的最大似然法和贝叶斯方法，通过投影和衍射重建在渐变折射率光纤的微米尺度上获取的倾斜序列。包含菲涅耳衍射消除了一些重建伪影，使用贝叶斯先验概率分布消除了其他伪影，从而实现了实质上更准确的重建。
