Research And Design Of Soft Tissue Modeling System Based On 3D Scanning

Virtual surgery simulation training is a typical application of virtual reality technology in the medical field.The virtual surgery simulation system involves many modules and crossdisciplinary research in multiple fields.The soft tissue model is the object of virtual surgery simulation and an important research part of the system.Therefore,the establishment a soft tissue model suitable for computer representation,manipulation and analysis is very necessary.This paper develops a soft tissue modeling system to solve the problem of soft tissue model establishment and provides a basic operation model for the virtual surgery system.The main research content is divided into the following three aspects:(1)Establish a soft tissue geometric model reconstruction system based on 3D scanning,and optimize it with the limitations of Poisson reconstruction in soft tissue modeling.U se this process to realize the reconstruction of the geometric model of the liver model,analyze the original data,establish the topological relationship between the point clouds,perform preprocessing such as segmentation,registration,and denoising on the point clouds,optimize the original Poisson reconstruction algorithm,and calculate the normal vector perform uniformity processing to improve the smoothness of reconstruction and improve the quality of the surface mesh.Furthermore,the OpenGL rendering pipeline is used to modify the color,material,and lighting of the model by changing the shader parameter values,so as to realize the rendering of the soft tissue model and improve the authenticity of the model.(2)Analyze the physical modeling method,combine the applicable scope and advantages and disadvantages of the modeling method to propose the classification of physical models,and classify and study according to different deformation conditions.When studying the overall deformation of the model,build internal points based on the idea of gradual change,establish a physical model of the soft tissue,and then simulate the overall deformation of the soft tissue model by changing the deformation step length.When studying the local deformation of the model,the internal points are established by tetrahedral division,the spring mass point model is established at the nodes,and the local deformation of the soft tissue model is simulated by changing the external force.(3)Establish a soft tissue modeling system based on the theoretical research results of liver geometry and physical modeling process.In the Qt5 compilation environment,Qt Designer is used to design the user interaction interface,combined with the PCL point cloud library,OpenGL graphics library and MySQL database,and the design of each functional module is realized by C++and GLSL language.Finally,the entire.soft tissue modeling system is completed construct.Taking the liver model as an example,this paper analyzes the establishment process of soft tissue geometric model and physical model in detail,and optimizes some modeling processes.Based on the above research results,a soft tissue modeling system is designed,and the modeling process is modularized.Realize the construction of soft tissue model quickly and conveniently,reduce manual intervention,improve the efficiency of soft tissue modeling,and provide real basic operation objects for virtual surgery simulation training.