重力作用下肝脏模型变形及切割模拟仿真

Here, a physics-based mass-spring soft tissue model is proposed to simulate the deformation of the liver accurately during partial hepatectomy in real time. First, a mass-spring model for livers was established based on the biomechanical properties of liver soft tissue. Then by applying this model, isolated pork livers were used as the experimental object to conduct experiments on deformation simulation under gravity and cutting simulation. Finally, a comparison diagram of CT scan reconstruction models of simulated and real deformation of porcine livers was given. It was found that the deformation of the isolated pork liver under gravity was within 2 mm and that during cutting was within 3 mm. In terms of real-time performance, GPU was introduced for parallel computing. It was found that the refresh rates were maintained at 300 and 200 FPS during gravity deformation and cutting simulation, respectively. It shows that the proposed model can truly reflect the deformation of liver tissue while boasting obvious advantages in computational efficiency. Therefore, the mass-spring soft tissue model proposed in this paper can meet the requirements of liver cutting.