基于MSCT和Mimics软件构建人体颅骨三维有限元模型

Establishment of a 3D Finite Element Model of Human Skull Using MSCT Images and Mimics Software

目的建立人体颅骨的有限元三维模型,探索人体颅骨有限元模型在生物力学分析中的价值。方法用MSCT对尸体头部扫描后,使用Mimics建模软件对CT二维图像进行三维重建,并对原始三维颅骨模型优化,然后对模型进行面网格和体网格划分,利用ANSYS有限元分析软件验证颅骨被物体打击和颅骨撞击地面的不同应力变化。结果原始三维颅骨模型显示出大量细小低质量三角片,且与实体结构有较高的相似性,优化后的有限元三维颅骨模型显示出高质量面网格和体网格,三角片数量较少。该四面体网格化颅骨3D模型可以有效显示颅骨局部受力和整体受力的变化结果。结论利用MSCT结合Mimics软件可以有效建立人体颅骨的三维有限元模型,并为研究颅骨不同受力后的应力变化提供了条件。

Objective To establish a human 3D finite element skull model,and to explore its value in biomechanics analysis.Methods The cadaveric head was scanned and then 3D skull model was created using Mimics software based on 2D CT axial images.The 3D skull model was optimized by preprocessor along with creation of the surface and volume meshes.The stress changes,after the head was struck by an object or the head hit the ground directly,were analyzed using ANSYS software.Results The original 3D skull model showed a large number of triangles with a poor quality and high similarity with the real head,while the optimized model showed high quality surface and volume meshes with a small number of triangles comparatively.The model could show the local and global stress changes effectively.Conclusion The human 3D skull model can be established using MSCT and Mimics software and provides a good finite element model for biomechanics analysis.This model may also provide a base for the study of head stress changes following different forces.