Membrane Tissue Deformation Modeling And Simulation Based On Eye Virtual Surgery

Along with the development of modern science, computer application technology hasplayed an irreplaceable role in study about subjects. In the medical field, typicalapplication is through the combination of computer and other equipment to virtual surgery.This can not only reduce the operation cost, but also has incomparable role in somerespects such as reducing surgical risk, training talents and so on. In virtual surgery, themostly applied technology includes the computer image processing technology, theHuman-Computer interaction techniques and the sensor technology and so on. This paperstudies deformation of membrane organization in virtual surgery, and focuses on thedeformation model and Collision Detection and simulation.Firstly, the model is a very important part in the research process of virtual surgery.This paper discussed several methods about making model, and mainly discussed thefinite-element model and the mass-spring model, then combined with the structure ofmass-spring model improves the model. By adding virtual stick, do specific analysis oneffort and deformation of the improved model. Owing to improvement of the model, whenmembrane organization which is attached occurs deformation, membrane organization hasa volume support and simulation result is more close to reality.Secondly, made a detailed analysis for solving methods of dynamic equation in themass-spring model. By comparing several solving methods’accuracy and taking time,use the median method to solve equation about deformation in the experimental process atthe last. In addition, for the bounding box algorithm’faults about hierarchical collisiondetection algorithm, combine with different detection objects in virtual surgery andpropose the“hybrid hierarchical bounding box’”algorithm which not only satisfy thecollision of rigid body, but also satisfy the collision of deformation membraneorganization. Meanwhile, the hierarchical bounding box’algorithm shortens the time ofcollision detection and enhances the instantaneity. This paper combined with the model toexperimental results are given. It is proved that hybrid hierarchical collision detectionalgorithm is effective. Finally, combined with the common membrane organization surgery of eye,construct the spherical membrane organization modeling with the volume support. In thedevelopment environment which is constructed by Visual C++6.0 and OpenGL functionlibrary, use touch equipment(PHANTOM Omni) to do the force feedback simulationexperiment with the Software Development Kit(GHOST-SDK), and give out simulationresult, after that analyze experimental result. The result shows that the improved modeland algorithm is feasible.