基于CT和解剖的三维数字化腕关节模型的构建

目的 探讨基于CT影像重建和虚拟解剖复位的三维数字化腕关节模型的构建及其应用价值,为开展腕关节生物力学功能研究准备前处理形态学模型.方法 采集1例中国青年男性志愿者右前臂高分辨CT图像,应用Mimics软件进行三维骨性重建;通过腕关节标本解剖和数值调查,应用3D-Doetor软件在CT图像软组织灰度区域,分割三角纤维软骨盘和韧带群并三维重建;将骨结构、软骨盘和韧带群导入Geomagic软件进行虚拟解剖复位和模型配准,构建网格优化的腕关节数字模型.结果 建立了包括桡、尺骨,掌骨(包含皮质、松质、髓腔),腕骨,三角纤维软骨复合体,桡腕背侧、桡舟、桡舟头、桡月韧带等结构的三维数字化腕关节模型.模型虚拟构建的韧带、软骨盘等的测量值基本在文献报告的数值范围之内.结论 在目前的个人计算机平台上依据CT影像和解剖资料,利用医学图像处理软件和三维重建软件可以准确、快捷地构建腕关节的三维数字模型,为腕部有限元分析及整个虚拟手的构建提供了技术支撑.

Reconstruction of a 3-D digital virtual wrist model based on CT images and anatomy

Objective To reconstruct a 3-D digital virtual wrist model based on CT images and anatomy,to explore its feasibility and clinical application,and to provide a pre-processing morphologic moddel for wrist biomechanics analysis.Methods High resolution serial CT images of a young Chinese male volunteer's right forearm were obtained.3-D bone reconstruction was done using Mimics software,Based on wrist anatomy and available data,the triangular fibrocartilage and the important ligaments were outlined on the grey scale areas of the CT images using the 3D-Doctor software.The contours of bones,tringular fibrocartilage and ligaments were then imported into the reverse-engineering software Geomagic to integrate and register into a wrist model. Results A wrist model containing radius,ulna,metacarpals (including cortical bone,cancellous bone and medullay cavity),carpal bones,triangular fibrocartilage complex,dorsal radiocarpal,radioscaphoid,radioscaphocapitate,and radiolunate ligaments was reconstructed.The 3-D digitized measurements of the ligaments of the wrist model were consistent with the anatomical data available in the literature. Conclusion It is feasible to reconstruct a 3-D digitized virtual wrist model based on CT images and anatomy data using medical image management software.This approach may be a pre-processing technique for virtual hand finite element analysis.