Nasoscope surgery, which leaves little operative wound and is followed by a quick recovery, is difficult to perform because of the complicated structure of nasal cavity. The research in and application of virtual surgery simulation technology, and the development of simulation training system of nasoscope surgery can immerge students in virtual environments, experience and lcsarn how to deal with various conditions of clinical operation, and at the same time experience and learn various practical operations by the senses of sight and touch. This saves the training cost and training times, and reduces the risk of the experimental operations for the unexperienced surgeors. This technology is badly needed in the surgery of the future. This paper is a research in surface-rendering physical model of less computerization and more reality in the application of nasoscope surgery simulation, in order to meet the special requirements of surgery simulation. It also is a research in elastical deformation model and pre-processing algorithm, and in collision detection algorithm, and in real-time force feedback based on mass-spring-damper model. The theories and techniques in this paper apply to elastical deformation object in virtual surgery, also based on linear elasticity theory and finite elements model. Their physical model and force feedback model can do a real-time calculation of deform and force feedback of the models with thousands of nodes. The research in and the application of these techniques lead to a system of nasoscope surgery simulation. This system, used in four kinds of operation, through force feedback device operates in real-time the models of nasal cavity structure built from medical images, so that deformation simulation, collision detection, hapic feedback, blooding effect. The clinical test and application of this system make students highly appreciate it. The result of the research shows that this system is of real-time character and of high practical value.
修改评论