A finite element model for analyzing shear wave propagation observed in magnetic resonance elastography
A finite element model for analyzing shear wave propagation observed in magnetic resonance elastography
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DOI：
10.1016/j.jbiomech.2004.09.029
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发表时间：
2005-11-01
影响因子：
2.4
通讯作者：
An, KN
中科院分区：
文献类型：
--
作者：
Chen, QS;Ringleb, SI;An, KN
磁共振弹性成像(MRE)是一种新的非侵入性方法，通过使用传统的磁共振成像(MRI)系统结合振荡的运动敏感梯度来检测剪切激励波产生的节点位移，从而确定材料的刚度。在MRE成为有用的诊断工具之前，必须研究材料特性、激励频率、边界条件和外加张力对剪切波长测量的影响。我们提出将有限元建模作为一种稳健的方法来系统地研究这些参数的影响。用ABAQUS软件建立了一个轴对称有限元模型来模拟琼脂糖凝胶模型。分别考察了材料刚度、密度和激发频率对传播剪切波长的影响。文中还讨论了边界条件对剪切波长的影响。将MRE的剪切波长测量结果与有限元模型的结果进行了比较，结果表明两种方法具有较好的一致性。(C)2004爱思唯尔有限公司。保留所有权利。
Magnetic resonance elastography (MRE) is a novel non-invasive approach to determine material stiffness by using a conventional magnetic resonance imaging (MRI) system incorporated with an oscillating motion-sensitizing gradient to detect nodal displacements produced by a shear excitation wave. The effects of material properties, excitation frequency, boundary conditions, and applied tension on shear wavelength measurement must be examined before MRE can become a useful diagnostic tool. We propose finite element (FE) modeling as a robust method to systematically study the effects of these parameters. An axisymmetric FE model was generated with ABAQUS to simulate agarose gel phantoms. The effects of material stiffness, density, and excitation frequency on propagating shear wavelength were examined individually. The effect of the boundary conditions on shear wavelength was also demonstrated. Results of shear wavelength from MRE measurement were compared with the results of FE model, which showed good agreement between the methods. (c) 2004 Elsevier Ltd. All rights reserved.