Limited view reconstruction for differential phase-contrast computed tomography.
Limited view reconstruction for differential phase-contrast computed tomography.
复制标题
微分相衬计算机断层扫描的有限视图重建。
DOI：
10.1364/oe.23.009717
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发表时间：
2015
期刊：
影响因子：
3.8
通讯作者：
M. Ando
中科院分区：
文献类型：
--
作者：
N. Sunaguchi;T. Yuasa;Feng;Rajiv Gupta;M. Ando
本文介绍了一种代数重建算法，使用全变分（TV）正则化微分相衬计算机断层扫描（DPC-CT），使用有限的视图数。为了克服TV正则化中固有的过度平坦，使用两步重建过程：我们首先从TV正则化的微分投影重建梯度折射率的断层图像;然后通过求解泊松方程将这些图像用于计算折射率的断层图像。由于梯度折射率的分布比折射率的分布平坦得多，我们在重建过程中加入了TV正则化。仿真结果表明，该方法可以实现满意的图像质量，从一个更少的数量的投影比所需的奈奎斯特采样定理。我们实验证明了所提出的方法的可行性，使用暗场成像光学PF-14 C光束线在光子工厂，KEK。微分相衬投影数据的实验采集从生物样品和DPC-CT图像重建。我们表明，少得多的投影时，所提出的算法被使用。
This paper describes an algebraic reconstruction algorithm that uses total variation (TV) regularization for differential phase contrast computed tomography (DPC-CT) using a limited number of views. In order to overcome over-flattening inherent in TV regularization, a two-step reconstruction process is used: we first reconstruct tomographic images of gradient refractive index from differential projections with TV regularization; these images are then used to compute tomographic images of refractive index by solving the Poisson equation. We incorporate TV regularization in the reconstruction process because the distribution of gradient refractive index is much more flattened than the refractive index. Simulations of the proposed method demonstrate that it can achieve satisfactory image quality from a much smaller number of projections than is required by the Nyquist sampling theorem. We experimentally prove the feasibility of the proposed method using dark field imaging optics at PF-14C beamline at the Photon Factory, KEK. The differential phase contrast projection data was experimentally acquired from a biological sample and DPC-CT images were reconstructed. We show that far fewer projections are needed when the proposed algorithm is used.
影响因子：
3.5
作者：
Wernick, MN;Wirjadi, O;Muehleman, C
通讯作者：
Muehleman, C
影响因子：
3.8
作者：
Chen, Guang-Hong;Tang, Jie;Leng, Shuai
通讯作者：
Leng, Shuai