Phase retrieval in quantitative x-ray microtomography with a single sample-to-detector distance
Phase retrieval in quantitative x-ray microtomography with a single sample-to-detector distance
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DOI：
10.1364/ol.36.001719
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发表时间：
2011-05-01
期刊：
影响因子：
3.6
通讯作者：
Xiao, T. Q.
中科院分区：
文献类型：
--
作者：
Chen, R. C.;Xie, H. L.;Xiao, T. Q.
相位检索从基于x射线传播的相衬图像中提取定量的相位信息。尽管存在固有的近似，但使用单个样品到探测器距离（SDD）的相位检索非常有吸引力，因为与基于吸收的成像相比，它没有设置并发症或额外的辐射剂量。考虑到相位衰减对偶性（epsilon = delta/beta，其中epsilon为常数），针对基于x射线传播的相对比计算机断层扫描（PPCT）中改进的Bronnikov算法，提出了一种简单的吸收校正因子。此外，提出了一种实用的计算最优epsilon值的方法，该方法不需要对样本的先验知识。在模拟和实验数据上进行的测试成功地从单个SDD-PPCT数据点区分了准均匀和弱吸收样品中的不同材料。(C) 2011美国光学学会
Phase retrieval extracts quantitative phase information from x-ray propagation-based phase-contrast images. Notwithstanding inherent approximations, phase retrieval using a single sample-to-detector distance (SDD) is very attractive, because it imposes no setup complications or additional radiation dose compared to absorption-based imaging. Considering the phase-attenuation duality (epsilon = delta/beta, where epsilon is constant), a simple absorption correction factor is proposed for the modified Bronnikov algorithm in x-ray propagation-based phase-contrast computed tomography (PPCT). Moreover, a practical method for calculating the optimal epsilon value is proposed, which requires no prior knowledge of the sample. Tests performed on simulation and experimental data successfully distinguished different materials in a quasihomogeneous and weakly absorbing sample from a single SDD-PPCT data point. (C) 2011 Optical Society of America