基于DICOM数据快速构建髋臼三维有限元模型

Establishment of a three-dimensional finite element model of acetabulum by using DICOM data

目的:为了能够提高髋臼组织有限元分析研究的水平,拟探讨利用多层螺旋CT获取髋臼骨扫描的DICOM数据,进而快速地建立高精度的髋臼骨三维有限元模型的方法。方法:2006-01采用上海长海医院多层螺旋CT对标准成年男性自愿者行髋臼CT扫描成像得到髋臼每层横截面图像,应用DICOM数据和Mimics软件行三维重建,结合有限元分析软件PATRAN2005R2构建髋臼三维有限元模型,同时在该模型上模拟单腿站立位时受力分布,对比国内外的实验结果进行检验。结果:利用所得数据建立了髋臼三维有限元模型,共19348节点,113028个单元,完整重现了髋臼复杂的形态,得到了皮质骨、松质骨、软骨等结构鲜明、直观的印象;单腿站立位的应力分析显示与以往实验结果基本相符。结论:运用Mimics软件提供了更为简单有效的建模方法,基于DICOM数据的三维有限元模型几何形状较准确,分析结果可信,所建立的髋臼三维有限元模型可以模拟髋臼生物力学实验。

AIM： To introduce a more precise method for construction of three-dimensional （3D） finite element model of acetabulum by DICOM data through multilayer spiral CT scanning. METHODS： In January 2006, a normal acetabulum of a adult man from Changhai Hospital was scanned by multilayer spiral CT for transverse section images, which were managed with DICOM data and. Mimics software for getting a 3D reconstruction model, and then PATRAN 2005R2 software was applied to construct the 3D finite element model of acetabulum. At the same time, the loading condition during single support phase was simulated. METHODS： A 3D finite element model of acetabulum was established, including 19 348 nodes of 113 028 units, and reflected the real acetabulum anatomy that consisted of cortical bone, cancellous bone and cartilage; The stress analysis at single support phase was the same as the results of previous experimental data. CONCLUSION： An easier and more precise 3D finite element model of acetabulum can be constructed with DICOM data and Mimics software, and also provides a reasonably and effective model for biomechanical analysis of acetabulum.