Chen Qingshan, Ringleb Stacie I, Manduca Armando, Ehman Richard L, An Kai-Nan
Biomechanics Laboratory, Division of Orthopedic Research, Mayo Clinic, Rochester, MN 55905, USA.
J Biomech. 2006;39(8):1428-34. doi: 10.1016/j.jbiomech.2005.04.009. Epub 2005 Jun 16.
Magnetic resonance elastography (MRE) can non-invasively determine 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.
磁共振弹性成像（MRE）能够基于传播的剪切波波长无创地确定材料的硬度。剪切波在有限的均匀各向同性材料中的传播会受到多种因素的影响。在本研究中，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进行MRE剪切测量的影响。将MRE测量结果与弹性固体中的波动理论进行了比较，并与有限元（FE）模型进行了定性比较。结果表明，边界条件、几何形状和预张力是在对有限材料进行MRE测试时需要考虑的重要因素，并且有限元建模有助于探索在各种边界条件和轴向应力等潜在因素下剪切波传播是如何受到影响的。
