重力作用下肝脏模型变形及切割模拟仿真  

Deformation and cutting simulation of the liver model under gravity

作　　者：张峰峰[1,2] 张石 黄柯 于凌涛 孙立宁[1,2] ZHANG Fengfeng;ZHANG Shi;HUANG Ke;YU Lingtao;SUN Lining(School of Mechanical and Electric Engineering, Soochow University, Suzhou 215006, China;Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123, China;College of Mechanical and Electric Engineering, Harbin Engineering University, Harbin 150001, China)

机构地区：[1]苏州大学机电工程学院,江苏苏州215006 [2]苏州大学苏州纳米科技协同创新中心,江苏苏州215123 [3]哈尔滨工程大学机电工程学院,黑龙江哈尔滨150001

出　　处：《哈尔滨工程大学学报》2021年第8期1096-1101,共6页Journal of Harbin Engineering University

基　　金：国家重点研发计划(2018YFB1307700).

摘　　要：为了能够实时且准确的模拟部分肝脏切除术中肝脏真实变形状态,本文提出了一种基于物理的质点弹簧软组织模型。依据肝脏软组织生物力学特性建立了针对肝脏的质点弹簧模型,利用此模型将离体猪肝作为实验对象,分别进行离体猪肝受重力变形以及离体猪肝的切割实验,给出了模拟变形与真实变形的离体猪肝CT扫面重建模型对比结果。实验结果表明:离体猪肝在重力作用下变形在2 mm内,离体猪肝切割变形在3 mm内;在实时性方面,引入GPU进行并行计算,在重力变形以及切割过程中刷新率分别保持在300FPS和200FPS。该模型能够真实反映肝脏组织形变,同时在计算效率方面具有明显的优势。本文提出的质点弹簧软组织模型能够满足肝脏切割的要求。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.

关 键 词：部分肝脏切除术 肝脏模型 质点弹簧 实时性 准确性 离体猪肝 虚拟手术 重力变形 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]