The Research Of Haptic Interaction And Rendering Technology In Virtual Liver Surgery

Surgical doctors need a lot of operation training and practice, but the traditional way of training is to use body as a training platform, this way is expensive, difficult to obtain new body and to reuse. Due to the continuous development of computer technologies, and the application of virtual reality in the field of medicine deepening, virtual surgery system is gradually to replace the original training mode, become a kind of new, efficient training methods in medicine field. Virtual surgery system does not rely on animal and human bodies, taking the computer technology to simulate the real operation environment. Not only can be used for training, but also can be used for pre-operation plan and accidents, and can improve the success rate of surgery and reduce risks, avoid the occurrence of medical accidents.Virtual surgery system must be able to bring the user experience and real interactive feelings, making users immerse in the virtual surgery environment, so the authenticity of visual and tactile is crucial for the virtual surgery system. In this paper, aiming at the problem of tactile interaction problems and rendering problems in the surgery system of virtual liver surgery, we study collision detection, texture mapping, texture mixing and other aspects, improving the authenticity and interaction feelings of the virtual liver surgery system, and satisfying the real-time requirements.In the virtual surgery system, when the collision between the virtual instruments and human tissues occurs, it should generate tactile feelings, and the premise of the calculation of tactile interaction is to know the moment and position of the collision, therefore, the problem of collision detection is an important research direction in virtual surgery system. In this paper, we study the various existing collision detection algorithms, and present a real-time collision detection algorithm based on space partition. It divides the overlapping space, and obtains the real-time collision result to satisfy the requirements of the virtual liver surgery system.In order to improve the authenticity of the virtual surgery system, we must perform the texture mapping of 3D models in the virtual liver surgery system. Due to the type of 3D model in the surgery system various much, we study three kinds of texture mapping algorithm for closed models and non-closed models in this paper, to conformal map the 3D model to the texture plane, and make the texture mapping real.There are two important operation steps of the real liver surgery: Meilan injection process and wound burning treatment. In this paper, we use texture mapping algorithm cleverly, through drawing Meilan diffusion textures in the preprocess stage, and real-time switching method, to simulate the dynamic effect of Meilan injection; we use texture blending technique and alpha channel technique to simulation the wound burning treatment.