Morphing the feature-based multi-blocks of normative/healthy vertebral geometries to scoliosis vertebral geometries: development of personalized finite element models
Morphing the feature-based multi-blocks of normative/healthy vertebral geometries to scoliosis vertebral geometries: development of personalized finite element models
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DOI：
10.1080/10255842.2018.1448391
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发表时间：
2018-01-01
影响因子：
1.6
通讯作者：
Balasubramanian, Sriram
中科院分区：
文献类型：
--
作者：
Hadagali, Prasannaah;Peters, James R.;Balasubramanian, Sriram
个性化有限元（FE）模型和六面体元素是生物力学研究的首选。基于几何的多块方法用于开发具有六面体网格的解剖学上精确的个性化有限元模型。为了开发个性化的有限元模型，在单个基础上手动构建大量几何形状的多个块是繁琐的。网格变形方法在每次网格化个性化几何时都能减轻上述繁琐，但会导致单元变形和几何数据丢失。当标准脊柱FE模型变形为受脊柱侧凸影响的脊柱几何形状时，此类问题的严重性增加。绕过变形导致的六边形网格失真或几何形状丢失问题的唯一方法是依赖于手动构建每个个体的受脊柱侧凸影响的脊柱几何形状的多块，这是时间密集型的。本文提出了一种从现有的多块标准椎骨中半自动地构建脊柱侧凸椎骨几何形状上的多块的方法。高质量的六面体单元生成的脊柱侧凸椎骨从变形的多块正常椎骨。正常脊柱的多块结构的构建时间为3个月，而脊柱侧凸的构建时间不到1天。通过变形现有的多块，在个性化的脊柱侧凸脊柱几何形状上构建多块所花费的努力显著减少。
Personalized Finite Element (FE) models and hexahedral elements are preferred for biomechanical investigations. Feature-based multi-block methods are used to develop anatomically accurate personalized FE models with hexahedral mesh. It is tedious to manually construct multi-blocks for large number of geometries on an individual basis to develop personalized FE models. Mesh-morphing method mitigates the aforementioned tediousness in meshing personalized geometries every time, but leads to element warping and loss of geometrical data. Such issues increase in magnitude when normative spine FE model is morphed to scoliosis-affected spinal geometry. The only way to bypass the issue of hex-mesh distortion or loss of geometry as a result of morphing is to rely on manually constructing the multi-blocks for scoliosis-affected spine geometry of each individual, which is time intensive. A method to semi-automate the construction of multi-blocks on the geometry of scoliosis vertebrae from the existing multi-blocks of normative vertebrae is demonstrated in this paper. High-quality hexahedral elements were generated on the scoliosis vertebrae from the morphed multi-blocks of normative vertebrae. Time taken was 3months to construct the multi-blocks for normative spine and less than a day for scoliosis. Efforts taken to construct multi-blocks on personalized scoliosis spinal geometries are significantly reduced by morphing existing multi-blocks.