人体腰椎节段CT图像的反求建模和有限元分析  

Reverse modeling and finite element analysis of human body lumbar segments based on CT image

作　　者：胡迎春[1] 余兵浩[1] 欧亚龙[1] 

机构地区：[1]广西科技大学机械工程学院,广西柳州545006

出　　处：《广西科技大学学报》2014年第2期13-16,39,共5页Journal of Guangxi University of Science and Technology

基　　金：广西自然科学留学回国基金项目(2011GXNSFC018005);广西高校优秀人才资助计划(桂教人[2010]65号)资助

摘　　要：利用Mimics将人体腰椎CT断层扫描图像反求建模,导入UG并加入包含纤维环及髓核的椎间盘,模拟建立人体腰椎L4-L5节段三维模型,再通过UG与ANSYS Workbench的无缝接口将该模型导入后者,对模型赋值并进行有限元分析,得出人体直立站位时,正常腰椎的椎体位移云图及应力云图.最后将模型进行简化,利用材料力学的理论公式进行强度校核.得知最大位移发生于椎间盘上表面前部,位移值为0.161 mm;最大应力出现在L4下关节突上,应力值为15.073 MPa.有限元分析结果与理论计算结果相对误差较小,表明方法可行,计算结果可靠,为临床医学提供理论参考.Human lumbar model was reversed to be constructed from CT tomography image by using Mimics software. Three-dimensional image model of lumbar L4-L5 segments including intervertebral disc contained annulus fibrosus and nucleus pulposus was established and simulated in UG software. Then, the model was imported into ANSYS Workbench to be analyzed in the condition of human upright and resulted in the nephogram of displacement and equivalent stress of normal human lumbar. The model was checked by being simplified in the way of theory of material mechanics formula. It was showed that the maximum displacement was 0.161mm which was located in upper surface of intervertebral disc, and the maximum stress was 15.073MPa which was on the L4 zygopophysis. It was resulted that the calculation in finite element analysis was close to the theoretical result, which was provided with theoretical reference for clinical medicine, and the relative error was small. The method was feasible and result was reliable.

关 键 词：CT图像 反求建模 腰椎L4-L5节段 有限元分析 强度校核 

分 类 号：TH123.4[机械工程—机械设计及理论] R318.01[医药卫生—生物医学工程]