首页> 外文期刊>Journal of Biomechanics >Differential effects of pre-tension on shear wave propagation in elastic media with different boundary conditions as measured by magnetic resonance elastography and finite element modeling
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Differential effects of pre-tension on shear wave propagation in elastic media with different boundary conditions as measured by magnetic resonance elastography and finite element modeling

机译:通过磁共振弹性成像和有限元建模测量,预应力对弹性介质在不同边界条件下的剪切波传播的不同影响

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摘要

Magnetic resonance clastography (MRE) can non-invasively deter-mine material stiffness based on the propagating shear wavelength. Shear wave propagation in a finite homogenous isotropic material can be affected by multiple factors. In this study we examined the effects of pre-tension and frequency on MRE shear measurements of gel phantoms with different boundary conditions, frequencies, and geometries. Results from MRE measurements were compared to wave motion theory in elastic solids and qualitatively to a finite element (FE) model. Results indicated that boundary conditions, geometry and pre-tension are important factors to be considered when performing MRE tests on a finite material, and that FE modeling can help explore how the shear wave propagation is affected under various boundary conditions and axial stresses, among other potential factors. (c) 2005 Elsevier Ltd. All rights reserved.
机译:磁共振共振成像(MRE)可以基于传播的剪切波长来无创地确定材料的刚度。有限均质各向同性材料中的剪切波传播会受到多种因素的影响。在这项研究中,我们研究了预张力和频率对具有不同边界条件,频率和几何形状的凝胶体模的MRE剪切测量的影响。将MRE测量的结果与弹性固体中的波动理论进行比较,并与定性(FE)模型进行定性比较。结果表明,在有限材料上进行MRE测试时,边界条件,几何形状和预应力是要考虑的重要因素,有限元建模可以帮助探索在各种边界条件和轴向应力等条件下,剪切波的传播如何受到影响。潜在因素。 (c)2005 Elsevier Ltd.保留所有权利。

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