【摘要】 目的　探讨由螺旋 CT扫描数据获取关节软骨表面轮廓信息的方法 ,为基于快速成型技术的个体化人工半膝关节研究奠定基础。　方法　采用 Picker 6 0 0 0螺旋 CT机对股骨远端进行层厚 1mm扫描 ,在 CT机 Voxel Q图像工作站进行三维容积重建 ,之后对重建数据间隔 0 .1mm下载二维断层图像。应用自行开发的数据格式转换软件 ,对下载图像进行滤波、去噪等处理 ,求出断面图像的二维边缘轮廓矢量化数据 ,输入 Surfacer 9.0软件进行矢量化三维重建。针对关节软骨轮廓的识别及假体设计的需要 ,提取出较精确的关节软骨表面轮廓三维图像 ,用于个体化人工半膝关节的计算机辅助设计。　结果　实现了 CT图像信息的矢量转换 ,获得了有关的关节软骨表面轮廓三维实体模型。　结论　由螺旋 CT数据进行关节软骨外形轮廓的矢量化重建 ,可获得精确的关节软骨轮廓三维实体模型 ,其可编辑性强 ,为复合大段异体骨移植的人工半膝关节假体计算机辅助设计和快速成型制造奠定了基础 ;对医学图像信息的矢量转换简便易行 ,在骨科、口腔颌面外科生物制造领域有较好的应用前景更多还原

【Abstract】 Objective To achieve three dimensional (3D) contour image of bone and articular cartilage for fabricating custom made artificial semi knee joint as segment bone allograft. Methods The distal femora of human and pig were scanned with Picker 6000 spiral X ray computed tomography with 1.0 mm thick slice. The data obtained were treated in Voxel Q image workstation for 3D reconstruction with volume rendering technique. After being downloaded to personal computer at 0.1 mm interval, the transaxial 2D image data were converted into 2D digitized contour data by using image processing software developed by the team. The 2D digitized data were inputted into image processing software of Surfacer 9.0 (Imageware Company, USA), then the 3D wire frame and solid images of femoral condyle were reconstructed. Subsequently, based on the clinical experience and the requirement of the design of artificial knee joint, the 3D contour image of bone or articular cartilage was extracted from the surrounding. Results The 3D contour image of bone or articular cartilage presented was edited and processed easily for the computer aided design(CAD) of custom made artificial knee joint. Conclusion The 3D contour image of bone and articular cartilage can be obtained by spiral CT scanning, and the digitized data can be applied directly to CAD of custom made artificial joint and subsequently rapid prototyping fabricating. In addition, the reconstruction method is simple and can be applied widely to clinical implant fabricating practice of dentistry and orthopaedics.更多还原