Deformation and cutting in virtual surgery

摘要

This paper discusses key techniques of the deformation and cutting in virtual surgery. It introduces a new geometry reconstruction algorithm, which can get layered tetrahedron based volume model. Based on the real physical property of soft-tissue, a simplified viscoelastic physical model is introduced, and the finite element method is used for the deformation computation. Different from the collision between rigid bodies, in virtual surgery environment the collision happens usually between rigid body and soft body. This paper brings forward a FDH based bounding volume hierarchy algorithm to handle the collision detection successfully. In order to simulate the cutting operation, a global cutting algorithm is introduced. The 3-D texture mapping is used to enhance the realistic effect.