计算机图形图象技术与虚拟现实技术应用于医学内窥镜系统，产生了虚拟内窥镜技术，为了将虚拟现实技术应用在医学图象处理方面，以方便医生进行虚拟手术与无创诊断，在综合利用各种计算机图形，图象技术的基础上，提出了完整的交互式虚拟内窥镜系统的框架，同时对系统结构和各种模型进行了分析和讨论，还针对系统的实时性和绘制结果的逼真性要求，提出了基于Object Cache和扩展的区域增长方法，并将其应用到医学图象处理当中，得到了较好的效果，该系统较好地解决了虚拟现实与可视化实时性和绘制精度两方面的要求，从而为医学图象可视化提供了有力的工具。

Technique of computer graphics and virtual reality, applied to medical endoscopy system, come up to a new virtual medical image application: virtual endoscopy. In order to apply virtual reality technique into medical image processing, make convenient for surgeons to access virtual and mini invasive surgery, this paper, presents a full interactive virtual endoscopy system framework, analyzing and discussing system architecture and algorithm models. We explain some key procedures in virtual endoscopy system such as definition of world coordinate, virtual camera, surface detection, normal approximation, volume rendering and surface rendering, and also some interactive control method. And also we put forwards some new methods such as object cache method and extended volume growing method to solve the problems encountered in system, such as real time volume rendering and accurate and smooth image result. Then we applied it in medical image processing, following satisfied result. This improves that these methods are useful and effective. Our system provides an effective tool for medical image visualization, successfully fulfilled the aim of real time displaying and good result in virtual realty and visualization application. It has certain practical meanings in algorithms and system analysis.