Many researchers have proposed the use of biomechanical models for high accuracy soft organ non-rigid image registration, but one main problem in using comprehensive models is the long computation time required to obtain the solution. In this paper we propose to use the Total Lagrangian formulation of the Finite Element method together with Dynamic Relaxation for computing intra-operative organ deformations. We study the best ways of estimating the parameters involved and we propose a termination criteria that can be used in order to obtain fast results with prescribed accuracy. The simulation results prove the accuracy and computational efficiency of the method, even in cases involving large deformations, nonlinear materials and contacts.

中文翻译：

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使用动态松弛计算术中脑移位

许多研究人员提出了使用生物力学模型进行高精度软器官非刚性图像配准，但使用综合模型的一个主要问题是获得解所需的计算时间长。在本文中，我们建议将有限元方法的总拉格朗日公式与动态松弛一起用于计算术中器官变形。我们研究了估计所涉及参数的最佳方法，并提出了一个终止标准，可用于以规定的精度获得快速结果。仿真结果证明了该方法的准确性和计算效率，即使在涉及大变形、非线性材料和接触的情况下也是如此。