人体软组织力学模型建立及参数获取要点讲解.doc

人体软组织力学模型建立及参数获取 摘　　要 在人体软组织形变仿真的过程中，系统必须保证稳定性并且满足形变效果精确度的要求；同时，由于仿真系统必须保证实时交互，因而实时性也是软组织形变中最重要的要求之一。因此，虚拟手术中人体软组织形变的仿真必须满足稳定性、精确性和实时性的要求。本文将从上述三方面要求出发，对虚拟手术仿真系统中人体软组织形变技术展开研究。 人体软组织弹性模型是指用于软组织形变建模的形变模型。随着生物力学的发展和计算机运算速度的提高，物理形变模型得到了很大的发展，先后出现了质量—弹簧模型和有限元模型。本文着重研究了质点一弹簧模型。 质量—弹簧模型是从离散物体模型出发考虑的。常规的质量一弹簧模型求解方法是欧拉迭代方法，系统参数比较多，收敛性、精确性较差。本文在实验室前期工作基础上，在能够保证系统收敛的参数范围中，运用程序进行优化，寻求能够提高模型的精度的参数。 关键词：软组织形变模型；质量—弹簧模型；肝脏组织参数获取 Human Soft Tissue Mechanics Model and Parameters Obtained ABSTRACT In the process of human soft tissue deformation simulation, the system must ensure stability and meet the deformation effect accuracy requirements; at the same time, since the system must guarantee the real-time interaction, and therefore the most important time is one of the requirements for soft tissue deformation. Therefore, simulation of virtual operation of human soft tissue deformation must satisfy the stability, accuracy and real-time requirements. This paper will be required from the above three aspects, to study human virtual operation simulation system of soft tissue deformation technology. The soft tissue of the body elastic model is used to model the deformation of soft tissue deformation modelling. With the development of computer operation speed and biomechanical improvement, physical deformation model has great development, has a mass-spring model and finite element model. This paper focuses on the particle model. The quality of a spring model in this paper is to consider the discrete object model. The quality of a spring model method is the routine Euler iterative method, more system parameters, poor convergence, accuracy. In this paper, based on previous work in the laboratory, can guarantee the convergence of the parameter range, use the process optimization, seeking to improve the precision of the parameter model. Key words: soft tissue deformation model; mass-spring model; acquire the liver tissue parameters  目　　录 　　1　绪论 1 1.1　课题研究背景和意义 1 1.2　国内外研究现状 1 2 质点-弹簧模型 3 2