Nonlinear finite element-based modeling of soft-tissue cutting
Nonlinear finite element-based modeling of soft-tissue cutting
复制标题
基于非线性有限元的软组织切割建模
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
S. Sirouspour
中科院分区：
文献类型：
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作者：
Bassma Ghali;S. Sirouspour
本文研究了生物软组织切割的非线性建模，用于医疗过程的仿真和规划。采用基于Ogden的本构方程，同时考虑几何非线性和材料非线性，模拟了软组织的复杂力学行为。该方法利用软组织材料在变形过程中的不可压缩特性，在空间域中利用有限元方法对可变形物体模型进行离散。元素分离和节点捕捉用于在网格中创建尽可能接近工具轨迹的切口，同时保留对象的质量和网格中元素的数量。此外，提出了一种算法，以确保切割技术保证了最低的网格质量，因此模拟的稳定性，在切割区域的几个元素重新网格化，只有在需要的时候。数值模拟已经进行，以评估所提出的建模技术的有效性。
This paper concerns with nonlinear modeling of biological soft-tissue cutting for simulation and planning of medical procedures. The complicated mechanical behavior of soft-tissue is modeled by considering both geometrical and material nonlinearities using an Ogden-based constitutive equation. The incompressible property of soft-tissue material during deformation is enforced and the Finite Element Method is utilized to discretize the deformable object model in the spatial domain. Element separation and node snapping are used to create a cut in the mesh that is as close as possible to the tool trajectory while preserving the mass of the object and the number of elements in the mesh. In addition, an algorithm is proposed to ensure that the cutting technique guarantees a minimum mesh quality and hence simulation stability by remeshing few elements in the cut area only when needed. Numerical simulations have been carried out in order to evaluate the effectiveness of the proposed modeling techniques.