摘要
目的建立一个精确的人体L3-L4腰椎节段有限元模型,用于腰椎生物力学的研究。方法基于可视人计划(visible human project,VHP)男性冷冻CT数据,通过Marchingcubes算法三维重建L3和L4椎骨的几何模型并转换为有限元网格,然后结合椎间盘和韧带的网格建立L3-L4节段的有限元网格。根据CT值设定材料特性建立有限元模型,施加压缩的边界条件进行有限元分析,并和参考模型的结果比较分析。结果基于CT的L3-L4节段有限元模型比参考模型更符合腰椎的解剖结构。结论基于CT的L3-L4节段有限元模型能够精确的描述腰椎解剖结构,保证有限元分析的准确性。
Objective To develop an accurate finite element （FE） model of human L3 - IA segement for the biomechanical research of lumbar spine. Method Based on the frozen male CT data of visible human project （VHP） , the geometrical model of L3 and IA lumbar vertebrae was three-dimensionally reconstructed with Marchingcubes algorithm and converted to FE mesh, then the FE mesh of L3 - IA segement was generated with the combination of disc and ligament meshes. After the assignment of bone material propreties according to CT numbers, the FE model of L3 - IA segement was developed to finish FE analysis under the loading conditons of compression. The results were compared with those of a referenced model. Result The CT-based FE model of L3 - IA segement was in coincidence with lumbar anatomic structure more than the referenced model. Conclusion The CT-based FE model of L3 - IA segement can accurately descibe the anatomic structure of lumbar spine and ensure the veracity of FE analysis.
出处
《北京生物医学工程》
2007年第3期266-269,共4页
Beijing Biomedical Engineering
基金
国家自然科学基金(60331010
60571013)资助
关键词
建模
有限元分析
腰椎
CT
应力分布
modeling
finite element analysis
lumbar spine
CT
stress distribution
