Study Of Soft Tissue Tear Simulation Method In Virtual Brain Tumor Removal Surgery

How to safely and efficiently conduct micro-neurosurgery training is a long-standing challenge.With the development of computer technology,virtual surgery provides a safe and effective training tool for surgeons,which has important application value and broad prospects.Due to the high complexity and specificity of brain tumor resection surgery,the research of virtual brain tumor removal surgery is still in a very preliminary stage.In terms of deformation simulation,it is still difficult for existing methods to realistically characterize soft tissue elasticity and other properties;in terms of tear simulation,it is difficult for existing methods to characterize inelastic properties such as damage tearing and plastic deformation of soft tissue under the action of external load.The limitations of existing studies make brain tumor removal simulation still face many difficulties and challenges.In this paper,a series of theoretical studies and simulation experiments are conducted to address the problems and challenges such as low fidelity of soft tissue deformation model and difficulty in characterizing soft tissue tearing process in virtual brain tumor resection surgery.The main work and innovation points of the paper are as follows:(1)A soft tissue deformation simulation model was established to simulate the deformation of soft tissues under the action of external stretching in brain surgery.In the proposed deformation simulation model,the relationship between the soft tissue model displacement and elastic force is established based on the finite element method,and the real-time solution calculation of the deformation model is realized based on the optimal implicit integration method.In addition,elastic-plasticity and other factors are introduced into the deformation model.The simulation and experimental results show that the proposed model can achieve realistic and efficient simulation of soft tissue deformation.(2)A soft tissue injury tear simulation model is proposed to simulate the tearing process of connective tissue between tumor and brain tissue under the action of external force.In the proposed damage tear model,the soft tissue connecting fibers are damaged under the action of external load,and when the damage continues to accumulate to a certain threshold condition,the soft tissue model tears.In addition,surface reconstruction and mapping of the model during soft tissue damage tearing was achieved.The simulation results show that the soft tissue injury model can simulate the tearing process of soft tissue connecting fibers under the action of external load during blunt brain tumor resection.The proposed soft tissue injury tearing model was applied to virtual brain tumor surgery simulation to realize the simulation of blunt brain tumor surgery.(3)Based on the theoretical results of the proposed highly realistic soft tissue deformation model and tear damage model on the existing hardware platform,the simulation training of blunt brain tumor detachment was realized in the virtual brain tumor removal simulation training system.The system provides surgeons with an immersive and reusable platform for surgical training system.