Computation of intra-operative brain shift using dynamic relaxation.

Computation of intra-operative brain shift using dynamic relaxation.
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DOI:
10.1016/j.cma.2009.06.012
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发表时间:
2009-09-01
影响因子:
7.2
通讯作者:
Miller K
Miller K
中科院分区:
工程技术1区
文献类型:
--
作者:
Joldes GR;Wittek A;Miller K

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许多研究人员已经提出使用生物力学模型进行高精度的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计算时间长。在本文中,我们建议使用有限元的全拉格朗日公式和动态松弛法来计算手术中器官的变形。我们研究了估计所涉及参数的最佳方法,并提出了一个终止准则,以便在规定的精度下获得快速的结果。仿真结果证明了该方法的准确性和计算效率,即使在大变形、非线性材料和接触的情况下也是如此。
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.
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