Research on soft tissue deformation and cutting in the virtual surgery

With the applications of OpenGL 3D rendering techniques and SensAble force feedback devices, this paper conducted an in-depth study on the solution procedure of virtual human soft tissue modeling, deformation and incision formation. We applied Mass-Spring System (MSS) to model human soft tissue and introduced its topology; during deformation process, Runge-Kutta Method (RKM) was adopted after its comparison with Euler and Midpoint Method and a dynamical local deformation method was proposed based on RKM. Frame rate per second (FPS) of local and global deformation is also compared. In the cutting process, three methods, namely method based on deleting mesh, MSS-based element meshing method and active points moving cutting triangle mesh algorithm method, were compared and a conclusion was drawn. For this conclusion, we proposed, for the first time, a new incision formation method based on local Bezier Curve. The experimental results indicated that this method can better balance the contradiction between real-time characteristic and precision and present very good simulation effects.