Surface texture evaluation of additively manufactured metallic cellular scaffolds for acetabular implants using X-ray computed tomography
Surface texture evaluation of additively manufactured metallic cellular scaffolds for acetabular implants using X-ray computed tomography
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DOI：
10.1007/s42242-019-00042-x
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发表时间：
2019-06-01
影响因子：
7.9
通讯作者：
Scott, Paul J.
中科院分区：
文献类型：
--
作者：
Lou, Shan;Pagani, Luca;Scott, Paul J.
髋臼植入物的表面形貌在提供细胞附着和增殖方面起着关键作用。由于支架几何形状的3D性质，髋臼杯上细胞支架层的表面纹理的测量和表征非常困难。建议使用X射线计算机断层扫描（XCT）来测量电子束熔化生产的钛髋臼杯的表面纹理。其细胞支架的表面纹理使用新开发的3D表面纹理参数进行评估，该参数允许在3D三角网格表面上进行表面表征。四个常用的高度参数，即算术平均高度Sa，均方根高度Sq，偏度Ssk和峰度Sku，计算从XCT扫描的三角形网格表面提取的曲面片。此外，表面峰值密度和凹坑密度，这是更相关的细胞通讯和增殖，估计基于三维分水岭分割。经验阈值为12 μ m的Wolf剪枝用于控制过分割。
The surface topography of acetabular implants plays a key role in providing cell attachment and proliferation. The measurement and characterisation of the surface texture of the cellular scaffold layer on the acetabular cup are very difficult due to the 3D nature of scaffold geometry. It is proposed to use X-ray computed tomography (XCT) to measure the surface texture of an electron beam melting-produced titanium acetabular cup. The surface texture of its cellular scaffold is evaluated using the newly developed 3D surface texture parameters, which allows surface characterisation on 3D triangular mesh surfaces. Four commonly used height parameters, i.e. the arithmetical mean height Sa, the root mean square height Sq, the skewness Ssk and the kurtosis Sku, are calculated from surface patches extracted from the XCT scanned triangular mesh surface. In addition, the surface peak density and pit density, which are more related to cell communication and proliferation, are estimated based on the 3D watershed segmentation. The Wolf pruning with an empirical threshold 12 mu m is used to control the over-segmentation.