Tyszka J M
Department of Radiology, Cedars-Sinai Medical Center, 8700 Beverly Blvd., Los Angeles CA 90048, USA.
Front Biosci. 1997 Jan 1;2:f2-3. doi: 10.2741/a235.
Three-dimensional models can be generated from slice images, such as those obtained from computed tomography (CT) and magnetic resonance imaging (MRI) using a variety of techniques. A popular method for rendering 3D anatomical models is the creation of polygonal mesh surfaces representing the boundary between tissues. Mesh surfaces can be rendered extremely quickly using conventional personal computers, without recourse to more expensive graphic workstations. The dissemination of three-dimensional (3D) models across the Internet has been made significantly easier by the definition of the Virtual Reality Markup Language (VRML) format. The VRML definition allows the parameters and relationships of 3D objects to be described in a text format. The text file can be transfered from a host computer to a remote client computer through the World Wide Web and viewed using readily available software (See Appendix). VRML is based on the definition of primitive 3D objects such as polygons and spheres. Consequently, the transition from a mesh surface derived from a clinical image data set to a VRML object is relatively simple, allowing for convenient and cost-effective dissemination of 3D clinical models across the internet.
三维模型可以从切片图像生成，比如通过计算机断层扫描（CT）和磁共振成像（MRI）获得的图像，使用多种技术即可实现。一种用于渲染三维解剖模型的常用方法是创建代表组织边界的多边形网格表面。使用传统个人计算机就能极其快速地渲染网格表面，无需借助更昂贵的图形工作站。虚拟现实标记语言（VRML）格式的定义使得三维（3D）模型在互联网上的传播变得显著更容易。VRML定义允许以文本格式描述三维对象的参数和关系。文本文件可以通过万维网从主机计算机传输到远程客户端计算机，并使用现成的软件进行查看（见附录）。VRML基于多边形和球体等基本三维对象的定义。因此，从临床图像数据集派生的网格表面到VRML对象的转换相对简单，这使得三维临床模型能够方便且经济高效地在互联网上传播。
