人体脊柱腰椎节段三维有限元建模

为了探讨人体脊柱腰椎节段三维重建方法,利用逆向工程软件Mimics（Materialise＇s Interactive MedicalImage Control System）,结合CT断层扫描图像,重建人体脊柱腰椎节段三维几何模型。经ANSYS转化建立脊柱腰椎L1-3的理想三维有限元模型,在Mimics中对所建立的有限元模型赋材质,实现了非均匀材质的骨组织赋值问题。该腰椎节段三维有限元模型高度模拟腰椎结构与材料的特性,具有结构完整、空间结构的测量准确度高、单元划分精细、重点突出等优点。本模型可进行任意旋转观察,可任意切割,并可通过调整模型几何及材料参数,施加不同的载荷与边界条件以模拟不同实验状态并能够以不同的文件格式输出,可用于计算机辅助设计、快速成型、有限元分析等领域。

Three-dimensional finite element modeling of human body lumbar

In order to discuss the method of three-dimensional reconstruction for human body lumbar, a three-dimensional geometrical model of lumbar was reconstructed based on CT images using reverse engineering software Mimics, and a three-dimensional finite element model of L1-3 was established by smoothing, remeshing and converting a surface mesh to a volumetric mesh in ANSYS software, subsequently the material properties can be displayed on the model through gray value in Mimics with asymmetrical material characters. The simulation on the structure and properties of lumbar through the established three-dimensional finite element model shows that its structure is whole and its elements are fine, which verifies the accuracy and credibility of the model. It can be rotated and segmented at random; the geometrical and material parameters can be adjusted; and different experimental conditions can be simulated by applying different loads and boundary conditions, which can be used to analyze the biomechanics characteristics of spine for human body in different conditions. The model with different formats can be used in CAD, RP（Rapid Prototyping） and FEA（Finite Element Analysis）.