Design And Implementation Of Interactive Simulation System For Thoracoscopic Lobectomy

As a cross-cutting technology,virtual reality technology integrates many technologies,such as computer graphics,multimedia,human-computer interaction and network,and is widely used in many fields.In recent years,the rapid development of virtual reality technology has opened up a new direction for the medical industry.The virtual surgery system developed by this technology can well realize the repetitive training of various minimally invasive operations and complex surgical operations,and can also realize preoperative navigation for some operations with higher difficulty.The main contents of this paper are as follows:(1)According to the operation process of VASTL,the functional requirements of the interactive simulation system are analyzed.The main contents of the simulation research on lung visualization,lung soft deformation,lung cutting and suture are defined.The overall design of the system and the selection and construction of the system platform,software and hardware functional components are carried out.(2)Several commonly used three-dimensional reconstruction algorithms are analyzed,and the MC(Marching Cube)three-dimensional reconstruction algorithm used in this interactive simulation system is deeply studied,and the algorithm is used to reconstruct the lungs.Aiming at the defects of MC algorithm such as large number of air detection cycles and rough surface of reconstructed model in the process of reconstructing lung,the parallel acceleration technology of GPU is used to improve the efficiency of algorithm execution.(3)Several commonly used software deformation algorithms are analyzed and compared from the aspects of stability,new operation efficiency and application scope.PBD(Position Based Dynamics)algorithm with higher comprehensive advantages is selected as the software deformation algorithm in this paper,and the principle of the algorithm is studied.PBD algorithm is used to simulate the deformation and suture of lung tissue.The GPU parallel acceleration of PBD algorithm is realized,which improves the efficiency of the algorithm significantly.(4)Combined with the existing hardware and software conditions,an interactive simulation system for thoracoscopic lobectomy was built,and the system modules were optimized.The simulation training of thoracoscopic pulmonary lobectomy was carried out with this system,and the experimental results of each module of the system were obtained,and the results were analyzed statistically.The final interactive simulation results show that the system has the characteristics of high fidelity,good stability,smooth operation,timely and accurate force feedback,which provides a low-risk,efficient and repeatable means for the training of thoracoscopic surgery.