Edge-Illumination X-Ray Dark-Field Tomography
Edge-Illumination X-Ray Dark-Field Tomography
复制标题
边缘照明X射线暗场层析成像
DOI：
10.1103/physrevapplied.19.054042
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发表时间：
2023-05
影响因子：
4.6
通讯作者：
A. Doherty;S. Savvidis;C. Navarrete-León;A. Olivo;M. Endrizzi;M. Gerli
中科院分区：
文献类型：
--
作者：
A. Doherty;S. Savvidis;C. Navarrete-León;A. Olivo;M. Endrizzi;M. Gerli
暗场成像是一种X射线技术，用于突出亚像素，通常是微米级的密度fl成像。它经常与标准的基于衰减的X射线成像和相衬X射线成像一起使用，这两种成像都在断层扫描中经常使用。我们提出了一种实验室边缘照明装置的x射线暗fi场计算机断层扫描(CT)。暗fi对比度显示随着通过成像对象的x射线路径长度线性增加，这是使用标准层析重建方法的先决条件。一个多材料的定制体模被用来展示Dark-field对比度CT如何根据材料的微观结构来补充衰减对比度CT来分离材料。作为一个更复杂的生物样本的例子，我们展示了一个大鼠心脏模型。我们通过与衰减对比层析成像的比较表明，Dark-fifi能够识别通过衰减对比通道未被检测到的附加结构，并且能够获得一致的更清晰的重建图像。
Dark-field imaging is an x-ray technique used to highlight subpixel, typically micrometer-scale, density fluctuations. It is often used alongside standard attenuation-based and also phase-contrast x-ray imaging, which both see regular use in tomography. We present x-ray dark-field computed tomography (CT) with a laboratory edge-illumination setup. The dark-field contrast is shown to increase linearly with the x-ray path length through the imaged object, a prerequisite for the use of standard tomographic reconstruction approaches. A multimaterial, custom-built phantom is used to show how dark-field contrast CT can complement attenuation contrast CT for the separation of materials based on their microstructure. As an example of a more complex, biological sample, we present a model rat heart. We show, by comparison with attenuation contrast tomography, that dark-field enables the identification of additional structures undetected through the attenuation contrast channel, as well as offering a consistently sharper reconstructed image.