Fougeron Nolwenn, Rohan Pierre-Yves, Macron Aurélien, Travert Christophe, Pillet Hélène, Skalli Wafa
a Institut de Biomécanique Humaine Georges Charpak, Arts et Métiers , Paris , France.
b CEA, LETI, CLINATEC, MINATEC Campus , Grenoble , France.
Comput Methods Biomech Biomed Engin. 2018 Apr;21(5):408-412. doi: 10.1080/10255842.2018.1469624. Epub 2018 Jul 3.
Several Finite Element (FE) models of the pelvis have been developed to comprehensively assess the onset of pathologies and for clinical and industrial applications. However, because of the difficulties associated with the creation of subject-specific FE mesh from CT scan and MR images, most of the existing models rely on the data of one given individual. Moreover, although several fast and robust methods have been developed for automatically generating tetrahedral meshes of arbitrary geometries, hexahedral meshes are still preferred today because of their distinct advantages but their generation remains an open challenge. Recently, approaches have been proposed for fast 3D reconstruction of bones based on X-ray imaging. In this study, we adapted such an approach for the fast and automatic generation of all-hexahedral subject-specific FE models of the pelvis based on the elastic registration of a generic mesh to the subject-specific target in conjunction with element regularity and quality correction. The technique was successfully tested on a database of 120 3D reconstructions of pelvises from biplanar X-ray images. For each patient, a full hexahedral subject-specific FE mesh was generated with an accurate surface representation.
已经开发了几种骨盆的有限元（FE）模型，用于全面评估病理情况的发生以及临床和工业应用。然而，由于从CT扫描和MR图像创建特定个体的有限元网格存在困难，现有的大多数模型都依赖于一个特定个体的数据。此外，尽管已经开发了几种快速且强大的方法来自动生成任意几何形状的四面体网格，但由于六面体网格具有明显的优势，如今仍然更受青睐，但其生成仍然是一个未解决的挑战。最近，有人提出了基于X射线成像的骨骼快速三维重建方法。在本研究中，我们采用了这样一种方法，通过将通用网格与特定个体目标进行弹性配准，并结合单元规则性和质量校正，来快速自动生成骨盆的全六面体特定个体有限元模型。该技术在一个由120个来自双平面X射线图像的骨盆三维重建组成的数据库上成功进行了测试。对于每位患者，都生成了具有精确表面表示的全六面体特定个体有限元网格。
