Six-dimensional real and reciprocal space small-angle X-ray scattering tomography
Six-dimensional real and reciprocal space small-angle X-ray scattering tomography
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DOI：
10.1038/nature16060
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发表时间：
2015-11-19
期刊：
影响因子：
64.8
通讯作者：
Pfeiffer, Franz
中科院分区：
文献类型：
--
作者：
Schaff, Florian;Bech, Martin;Pfeiffer, Franz
当与光栅扫描结合使用时，小角X射线散射（SAXS）已被证明是一种有价值的纳米级成像技术（1），例如骨骼，牙齿和脑部物质（2-5）。虽然二维投影成像已被成功地用于表征各种材料，其三维扩展，SAXS计算机断层扫描，提出了重大的挑战，这还有待克服。先前使用SAXS计算机断层扫描的工作（6-11）无法在重建期间保留定向SAXS信号。在这里，我们提出了一个解决这个问题，并获得一个完整的SAXS计算机断层扫描，它保留了定向散射信息。通过引入虚拟层析轴，我们利用记录在一个区域探测器上的二维SAXS信息，并使用它来重建完整的三维散射分布在倒易空间中的三维物体的每个体素在真实的空间。所提出的方法可能是感兴趣的相结合的六维真实的和倒易空间表征介观材料与层次结构的功能与长度尺度范围从几纳米到几毫米，例如，生物材料，如骨或牙齿，或功能材料，如燃料电池或电池组件。
When used in combination with raster scanning, small-angle X-ray scattering (SAXS) has proven to be a valuable imaging technique of the nanoscale(1), for example of bone, teeth and brain matter(2-5). Although two-dimensional projection imaging has been used to characterize various materials successfully, its three-dimensional extension, SAXS computed tomography, poses substantial challenges, which have yet to be overcome. Previous work(6-11) using SAXS computed tomography was unable to preserve oriented SAXS signals during reconstruction. Here we present a solution to this problem and obtain a complete SAXS computed tomography, which preserves oriented scattering information. By introducing virtual tomography axes, we take advantage of the two-dimensional SAXS information recorded on an area detector and use it to reconstruct the full three-dimensional scattering distribution in reciprocal space for each voxel of the three-dimensional object in real space. The presented method could be of interest for a combined six-dimensional real and reciprocal space characterization of mesoscopic materials with hierarchically structured features with length scales ranging from a few nanometres to a few millimetres-for example, biomaterials such as bone or teeth, or functional materials such as fuel-cell or battery components.