医学图像三维有限元重建中的数据管理及T10～T12胸椎模型建立

The Data Management of 3D FE Model Reconstruction Based on Medical Images and the Modeling for T10-T12 Thoracic Vertebrae

在进行生物力学分析时 ,依靠序列医学图像进行三维有限元模型重建是一种必要的手段 ,但是此过程中图像的数据处理和网格划分等繁重的前处理工作 ,成为了有限元分析工作的瓶颈 ,尤其是形状和其医学图像的数据具有复杂性的胸椎的模型的建立。针对胸椎三维有限元模型建立所必需的数据 ,给出了基于 CT医学图像处理所必需的数据结构和类型 ,分析了数据获得和处理的方法。同时提出了基于分块建模思想的数据管理方法 ,结合MSC.Marc软件实现了网格划分 ,建立了 T10～ T12段胸椎的三维有限元模型 ,其形态特征基本保持了实际骨骼的外形特征 ,满足了生物力学研究分析的要求。针对医学序列图像处理和有限元模型的建立过程中的数据获得与管理 ,是非常有意义的重要工作之一 ,对于其他类似的基于医学图像 (CT、MRI等 )的人体组织的三维有限元重建工作 ,具有拓展意义和实际的指导意义。

Setting up the 3D finite element (FE) model on the basis of medical images is a necessary method of biomechanical analysis. The pretreatment, including data processing of images and mesh generation, becomes the bottleneck of FE analysis, and this is especially the case of the modeling for thoracic vertebrae, because the shapes and data are complicated. In this paper, on the basis of the data for building a 3D FE model of thoracic vertebrae, we present some structures and types of data which are essential for the reconstruction of CT medical image, analyze some methods for obtaining and processing the data from images, and then advance a theory for data management based on mesh generation by block with the software MSC.Marc. A 3D-FE Model of T10-T12 thoracic vertebrae is set up, which keeps the configuration of the true one, and satisfies the requirements of biomechanical analysis. We focus affention on the data obtainment and management during medical image processing and FE modeling, all of which are very important for the biomechanical analysis. It is helpful and instructive to reconstruct some similar tissues of human body on the basis of the medical images from CT, MRI, etc.