Research On Elastic Deformable Model Of Soft Tissue

The elastic soft tissue deformation model is the deformable model for soft tissue deformation. Early geometric deformable model only considered the geometrical nature of the human body. With the evolvement of biomechanics and the improvement of computer's performance, it has gotten a great progress in physical deformable models. Mass-spring model and finite element model were proposed. Mass-spring model is a simple physical model with high computation speed, but it has some drawbacks: low precision and bad robustness. In contrast to discrete mass-spring model, finite element model is a continuum model, so it can provide a more physical realistic simulation. But the computation of finite element method is large and convergence time is very long.Mass-spring model and finite element model are important points in this thesis. As to the bad robust drawback, many works are done to the influence of all system parameters on convergence speed and precision. Quasi-static simulation method and direct computation method are applied to improve computation speed and get robust. Also the basic steps in using finite element model to compute deformation are listed with experiment results.The last part is an application of elastic soft tissue deformable model in plastics surgery. There are several steps in this simulation: data acquirement and preprocessing, geometric model build-up, physical model build-up, data processing, system solution. Mass-spring model with quasi-static simulation method is applied to predict the deformation of soft tissue caused by the movement of bone tissue.