Application Of Soft Tissue Modeling And 3D Stereoscopic Display In Virtual Surgery System

The virtual surgery simulation system is of great significance in assisting junior doctors in surgical training,which can help them quickly master surgical operation skills.Aiming at the problems of complex soft tissue model grids for 3D reconstruction of the current virtual surgery simulation system,which is not conducive to the fluency of the surgical system,the low accuracy of the biomechanical model,and the lack of immersion in the 2D display,this paper designs an edge folding algorithm to simplify the soft tissue model.The fluency of the virtual surgery simulation system is improved,and the biomechanical model of this paper is constructed based on the nonlinear spring model,which can accurately describe the mechanical properties of soft tissues.Finally,a 3D stereoscopic display system is designed and applied to the virtual surgery simulation system.Enhances the immersion of the virtual surgery simulation system.The main contents of the paper are as follows:Firstly,in view of the problems of grid redundancy,poor fluency and real-time performance of the surgical system in the geometric model of soft tissue organs based on 3D reconstruction of medical images,the specific requirements of the virtual surgery simulation system for the geometric model are analyzed,and the traditional edge folding simplification is improved.The algorithm simplifies the mesh.The algorithm divides the geometric model into the operating area and the non-operating area,and implements different simplification strategies for the two areas;introduces a new folding cost calculation factor to optimize the order of edge folding;determines the position of the newly generated vertex according to the triangle area of the vertex neighborhood.Finally,the experimental comparison is carried out.The feature retention degree of the tissue model generated by the improved algorithm is relatively complete,the model loading speed is increased by 24.2%,and the frame rate during grid traversal is increased by 52.9 frames,which effectively improves the fluency of the surgical system.Secondly,in view of the inaccurate mechanical calculation of most of the current virtual surgery simulation systems,this paper establishes a soft tissue biomechanical model based on the nonlinear spring model.In order to present the real force feedback to the doctor,the mechanical experiment of isolated heart puncture was carried out,and the biomechanical model parameters of this paper were solved according to the actual puncture experimental data.The experimental results show that the average error between the interaction force calculated by the mechanical model in this paper and the actual interaction force is 0.017 N,and the accuracy is high.Thirdly,in view of the problem that the display modules of most surgical systems cannot transmit depth information and lack stereoscopic sense,a 3D stereoscopic display subsystem is designed.The active shutter stereoscopic display scheme is used to realize the stereoscopic display of the virtual surgery simulation system,which effectively improves the immersion of the virtual surgery simulation system.Finally,this paper implements a complete virtual surgery simulation system based on the Touch device.Draw the model through 3DS Max to build the operating room scene.The collision detection module and the haptic feedback module are designed respectively,and the UI interaction interface is drawn to realize a complete virtual surgery simulation system.Finally,the performance test is carried out.The results show that the virtual surgery system in this paper has a good sense of presence,real touch and smooth operation of the system.