Research On Guidewire Simulation Algorithm And Contrast Agent Diffusion Imaging Algorithm In Virtual Interventional Surgery

The virtual surgery training system combines virtual reality technology with surgical operation to create an immersive operating environment for the surgeons.It is of great significance to improve the traditional training methods,improve the training effect and shorten the training period and practical value.In this paper,through the research on the related technologies of virtual interventional surgery system,the research ideas of the paper are established.The improved position dynamics algorithm is introduced into the virtual interventional surgery to simulate the physical movement of the guide wire,and the position dynamics based guide-wire is realized.Design and implemente contrast agent diffusion algorithm and X-ray imaging simulation algorithm under complex vascular network structure,and realize the dynamic display of contrast agent in X-ray image.Finally,complete the software of virtual interventional surgery system design and implementation.The innovation of this paper is to design and implement a position dynamics-based guidewire motion simulation algorithm.By using positional constraints to represent the tensile,bending and twisting physical properties of the guidewire,the simulation of the guidewire motion process is realized.Improve the real-time and convergence of the guide wire motion simulation.The research content of this paper are as follows:(1)Design and implement a motion simulation algorithm based on position dynamics.Based on the research of position dynamics algorithm,it is introduced into virtual interventional surgery.The physical motion of the guide wire is modeled by positional constraint method and the model is iteratively solved.A positional dynamics-based guide wire is realized.Motion simulation algorithm.By analyzing and comparing the guide wire motion simulation algorithm,the advantages of the algorithm in real-time and convergence are further verified.(2)Design and implement the contrast agent diffusion algorithm and the X-ray imaging simulation algorithm.By combining the one-dimensional linear fluid model with the Navier-Stokes fluid diffusion model,the three-dimensional structure of the blood vessel is simplified,and the contrast agent diffusion algorithm under complex vascular network is realized.The X-ray object is calculated by the ray casting method.After the attenuation,the energy reaching the display screen realizes the X-ray imaging simulation algorithm;the influence of the concentration of the contrast agent on the X-ray imaging is introduced,and the dynamic interactive display of the contrast agent in the X-ray image is realized.(3)Complete the software design and implementation of the virtual interventional surgery system.Through the requirements analysis of the physical simulation,surgical control,CPU/GPU acceleration,collision detection and surgical navigation of the virtual interventional surgery system,the overall software architecture design of the virtual interventional surgery system was completed.The main functions of the virtual interventional surgery system were completed.The design and implementation of the module,including the system operation interface,physical simulation of the guide wire movement and contrast agent diffusion,and interactive control.