Reconstruction of scalar and vectorial components in X-ray dark-field tomography
Reconstruction of scalar and vectorial components in X-ray dark-field tomography
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DOI：
10.1073/pnas.1321080111
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发表时间：
2014-09-02
影响因子：
11.1
通讯作者：
Riess, Christian P.
中科院分区：
文献类型：
--
作者：
Bayer, Florian L.;Hu, Shiyang;Riess, Christian P.
基于光栅的X射线暗场成像是一种用于在低于设置分辨率的尺寸尺度上获得物体结构的图像对比度的新技术。这种方法对于医学成像和无损检测特别有益。已经表明，暗场信号取决于观察方向。然而，到目前为止，用于完全恢复断层体积中的取向依赖性的算法仍然是未开发的。在这篇文章中，我们提出了一种基于光栅的X射线暗场层析成像的重建方法，该方法将依赖于方向的信号建模为来自标准层析扫描的额外可观察信号。详细地说，我们将断层体积扩展到一组张量体素数据，包含局部方向和暗场散射的贡献。在我们的实验中，我们提出了几个试样表现出的微观结构中的异质组合物，这表明了该方法的诊断潜力的第一结果。
Grating-based X-ray dark-field imaging is a novel technique for obtaining image contrast for object structures at size scales below setup resolution. Such an approach appears particularly beneficial for medical imaging and nondestructive testing. It has already been shown that the dark-field signal depends on the direction of observation. However, up to now, algorithms for fully recovering the orientation dependence in a tomographic volume are still unexplored. In this publication, we propose a reconstruction method for grating-based X-ray dark-field tomography, which models the orientation-dependent signal as an additional observable from a standard tomographic scan. In detail, we extend the tomographic volume to a tensorial set of voxel data, containing the local orientation and contributions to dark-field scattering. In our experiments, we present the first results of several test specimens exhibiting a heterogeneous composition in microstructure, which demonstrates the diagnostic potential of the method.