3D chemical imaging in the laboratory by hyperspectral X-ray computed tomography.
3D chemical imaging in the laboratory by hyperspectral X-ray computed tomography.
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DOI：
10.1038/srep15979
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发表时间：
2015-10-30
影响因子：
4.6
通讯作者：
Cernik RJ
中科院分区：
文献类型：
--
作者：
Egan CK;Jacques SD;Wilson MD;Veale MC;Seller P;Beale AM;Pattrick RA;Withers PJ;Cernik RJ
我们报告的发展，实验室为基础的高光谱X射线计算机断层扫描，使内部元素化学的对象进行重建和可视化的三维。该方法采用具有足够能量分辨率的光谱X射线成像检测器来区分各个元素吸收边缘。然后可以通过K边减法或替代地通过逐体素光谱拟合来得到元素分布，以给出相对原子浓度。我们展示了它的应用程序，两个材料系统：研究工业规模的化学加工多孔基板上的催化剂材料的分布;和映射的矿物和夹杂物相内的矿化矿石样品。该方法利用标准实验室X射线源，测量时间与传统计算机断层扫描所需的时间相似。
We report the development of laboratory based hyperspectral X-ray computed tomography which allows the internal elemental chemistry of an object to be reconstructed and visualised in three dimensions. The method employs a spectroscopic X-ray imaging detector with sufficient energy resolution to distinguish individual elemental absorption edges. Elemental distributions can then be made by K-edge subtraction, or alternatively by voxel-wise spectral fitting to give relative atomic concentrations. We demonstrate its application to two material systems: studying the distribution of catalyst material on porous substrates for industrial scale chemical processing; and mapping of minerals and inclusion phases inside a mineralised ore sample. The method makes use of a standard laboratory X-ray source with measurement times similar to that required for conventional computed tomography.