Kerckhofs G, Schrooten J, Van Cleynenbreugel T, Lomov S V, Wevers M
Department of Metallurgy and Materials Engineering, Katholieke Universiteit Leuven, Kasteelpark Arenberg 44-bus 2450, B-3001 Leuven, Belgium.
Rev Sci Instrum. 2008 Jan;79(1):013711. doi: 10.1063/1.2838584.
X-ray microfocus computed tomography (micro-CT) is recently put forward to qualitatively and quantitatively characterize the internal structure of porous materials. However, it is known that artifacts such as the partial volume effect are inherently present in micro-CT images, thus resulting in a visualization error with respect to reality. This study proposes a validation protocol that in the future can be used to quantify this error for porous structures in general by matching micro-CT tomograms to microscopic sections. One of the innovations of the protocol is the opportunity to reconstruct an interpolated micro-CT image under the same angle as the physical cutting angle of the microscopic sections. Also, a novel thresholding method is developed based on matching micro-CT and microscopic images. In this study, titanium porous structures are assessed as proof of principle. It is concluded for these structures that micro-CT visualizes 89% of the total amount of voxels (solid and pore) correctly. However, 8% represents an overestimation of the real structure and 3% are real structural features not visualized by micro-CT. When exclusively focusing on the solid fraction in both the micro-CT and microscopic images, only an overestimation of about 5% is found.
X射线微焦点计算机断层扫描（微CT）最近被提出来用于定性和定量地表征多孔材料的内部结构。然而，众所周知，诸如部分体积效应等伪影在微CT图像中是固有存在的，从而导致相对于实际情况的可视化误差。本研究提出了一种验证方案，未来可通过将微CT断层图像与微观切片进行匹配，用于一般地量化多孔结构的这种误差。该方案的创新之一是有机会在与微观切片的物理切割角度相同的角度下重建插值微CT图像。此外，基于微CT和微观图像的匹配开发了一种新颖的阈值化方法。在本研究中，对钛多孔结构进行了原理验证评估。对于这些结构得出的结论是，微CT正确地可视化了体素（固体和孔隙）总量的89%。然而，8%表示对真实结构的高估，3%是微CT未可视化的真实结构特征。当仅关注微CT和微观图像中的固体部分时，仅发现约5%的高估。
