3-D FDTD simulation of shear waves for evaluation of complex modulus imaging.
3-D FDTD simulation of shear waves for evaluation of complex modulus imaging.
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用于评估复模量成像的剪切波 3-D FDTD 模拟。
DOI：
10.1109/tuffc.2011.1816
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
Insana,Michael
中科院分区：
文献类型：
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作者：
Orescanin,Marko;Wang,Yue;Insana,Michael
采用时域有限差分法(FDTD)对三维粘弹性介质中描述剪切波传播的Navier方程进行了数值求解。解是由横向散射速度波形成的，然后通过与非均质水凝胶模体中的实测波场进行比较来验证。以数值算法为工具，研究了波在非均匀粘弹性介质中的传播对复剪切模估计的影响。我们使用代数Helmholtz逆(AHI)技术从二维和三维速度模拟和实验数据中求取复剪切模数。虽然通常需要三维速度估计，但对于某些对象几何形状，二维反演可以提供材料属性的准确估计。通过模拟和实验，研究了弹性剪切模量图和动态粘性剪切模量图中产生的伪影与剪切波长和平均粘度的关系。
The Navier equation describing shear wave propagation in 3-D viscoelastic media is solved numerically with a finite differences time domain (FDTD) method. Solutions are formed in terms of transverse scatterer velocity waves and then verified via comparison to measured wave fields in heterogenous hydrogel phantoms. The numerical algorithm is used as a tool to study the effects on complex shear modulus estimation from wave propagation in heterogeneous viscoelastic media. We used an algebraic Helmholtz inversion (AHI) technique to solve for the complex shear modulus from simulated and experimental velocity data acquired in 2-D and 3-D. Although 3-D velocity estimates are required in general, there are object geometries for which 2-D inversions provide accurate estimations of the material properties. Through simulations and experiments, we explored artifacts generated in elastic and dynamic-viscous shear modulus images related to the shear wavelength and average viscosity.