Magnotta Vincent A, Li Wen, Grosland Nicole M
Department of Radiology, The University of Iowa, Iowa City, IA, 52242.
Midas J. 2008 Aug 14;2008:629.
The finite element (FE) method is a powerful tool for the study of biomechanics. One of the limiting factors in transitioning this tool into the clinic is the time required to generate high quality meshes for analysis. Previously, we developed a mapped meshing technique that utilized force control and a finite element solver to warp a template mesh onto subject specific surfaces. This paper describes a displacement based method that directly warps the template mesh onto subject specific surfaces using distance as the driving measure for the deformable registration. The resulting meshes were evaluated for mesh quality and compared to the force based method. An initial evaluation was performed using a mathematical phantom. The algorithm was then applied to generate meshes for the phalanx bones of the human hand. The algorithm successfully mapped the template bone to all of the bony surfaces, with the exception of the distal phalanx bone. In this one case, significant differences existed between the geometries of the template mesh and the distal phalanx. Further refinement of the algorithm may allow the algorithm to successfully generate meshes even in the presence of large geometric shape differences.
有限元（FE）方法是研究生物力学的有力工具。将该工具应用于临床的限制因素之一是生成用于分析的高质量网格所需的时间。此前，我们开发了一种映射网格划分技术，该技术利用力控制和有限元求解器将模板网格扭曲到特定个体的表面上。本文描述了一种基于位移的方法，该方法使用距离作为可变形配准的驱动度量，将模板网格直接扭曲到特定个体的表面上。对生成的网格进行了质量评估，并与基于力的方法进行了比较。首先使用数学模型进行了初步评估。然后将该算法应用于生成人手指骨的网格。该算法成功地将模板骨映射到了所有骨表面，但末节指骨除外。在这种情况下，模板网格和末节指骨的几何形状存在显著差异。进一步改进该算法可能会使其即使在存在较大几何形状差异的情况下也能成功生成网格。
