基于CT扫描及CAD技术建立下腰椎三维有限元模型  

Construction of a three-dimensional finite element model of lower lumbar spine based on computed tomography images and computer aided design

作　　者：付裕[1] 阮狄克[2] 霍洪军[1] 杨学军[1] 李晨光[3] 

机构地区：[1]内蒙古医学院第二附属医院胸腰椎脊柱外科,内蒙古自治区呼和浩特市010030 [2]解放军海军总医院骨科,北京市100037 [3]北京航空航天大学宇航学院,北京市100083

出　　处：《中国组织工程研究与临床康复》2011年第9期1557-1561,共5页Journal of Clinical Rehabilitative Tissue Engineering Research

基　　金：内蒙古医学院第二附属医院科研基金:下腰椎三维有限元模型的建立~~

摘　　要：背景:近年来,计算机技术和有限元理论的飞速发展为构建腰椎模型提供了技术支持,有限元模型的精确性和可靠性显著提高,为研究椎间盘、椎板切除、腰椎融合、脊柱内固定材料等临床相关的生物力学问题提供了更好的平台。目的:应用三维有限元法建立L3～5腰椎活动节段力学模型。方法:通过CT扫描、Unigraphics V18.0软件进行影像边界记录、定标等方法,按照点、线、面、体的顺序重建三维结构,采用CAD数据处理技术,输入相关的材料特性,验证重建模型的有效性。结果与结论:建立下腰椎的三维有限元模型(L3～5),分析结果证明其在仿真分析中是可行的,可以模拟生物力学实验。建立的模型共有6482个节点,31326个单元,生成网格时利用网格生成器的扫掠和优化功能,尽量依据模型的几何外形,使网格生成的最少,兼顾了对建模准确性和计算可行性,同时又能充分满足对腰椎的生物力学研究。BACKGROUND：Currently,the rapid developments of computer technology and finite element theory provide technical supports for construction of lumbar spine models.The finite element model with high accuracy and reliability provides better platform for clinical biomechanics,such as intervertebral discs,lamina excision,lumbar fusion,and spinal internal fixation materials.OBJECTIVE：To construct a lumber spine （L3-5） biomechanical model using three-dimensional finite element method.METHODS：Reconstructing the skeleton through CT scan,recording the edges of image,calibrating in sequence of point,line,face and solid.Mapped-mesh technique was used to obtain the finite element,adopt finite element commercial software package Unigraphics V18.0 was used to study the response of the disc model.RESULTS AND CONCLUSION：The finite element model of lower lumbar spine （L3-5） was reconstructed,which can simulate biomechanical experiment.There were 6 482 nodes and 31 326 units in the model.Based on geometrical shape of model,the mesh generation was reducedminimum utilizing mesh generator,which can not only ensure model accuracy and calculation feasibility,but also meet needs of biomechanical studies.

关 键 词：腰椎 有限元模型 生物力学 CT CAD 

分 类 号：R318[医药卫生—生物医学工程]