三维粘弹性非均匀介质声传播模拟及其在医用横波弹性成像中的应用

IF 1.3 3区物理与天体物理 Q3 ACOUSTICS

Journal of Theoretical and Computational Acoustics Pub Date : 2019-10-15 DOI:10.1142/s2591728519500038

P. S. Bidari, H. Assi, R. Cobbold, J. Alirezaie, J. Tavakkoli

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引用次数: 0

摘要

基于含三维二阶时域完美匹配层的弹性动力波动方程，提出了一种新的三维粘弹性非均质介质中超声传播数值模拟框架。给出了该公式的有限差分离散化，并进行了稳定性分析。所得到的模型能够模拟任意声源几何形状和激励以及任意初始和边界条件下的三维剪切和纵向声波。最后通过一个仿真实例说明了该方法在组织弹性成像中的应用。具体地说，横波从局部病变到周围正常组织的传播被检查。

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Simulation of Acoustic Propagation in 3D Viscoelastic Inhomogeneous Media with Application to Medical Shear Wave Elastography

This paper proposes a new numerical framework to simulate ultrasound wave propagation in 3D viscoelastic heterogeneous media based on the elastodynamic wave equation including a 3D second-order time-domain perfectly matched layer formulation. A finite difference discretization of this formulation is presented, along with a stability analysis. The resulting model is capable of simulating 3D shear and longitudinal acoustic waves for arbitrary source geometries and excitations, together with arbitrary initial and boundary conditions. A simulation example is provided to show the application of our proposed method for tissue elastography imaging. Specifically, the propagation of shear waves from a localized lesion to the surrounding normal tissue is examined.

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来源期刊

Journal of Theoretical and Computational Acoustics Computer Science-Computer Science Applications

CiteScore

2.90

自引率

42.10%

发文量

期刊介绍： The aim of this journal is to provide an international forum for the dissemination of the state-of-the-art information in the field of Computational Acoustics. Topics covered by this journal include research and tutorial contributions in OCEAN ACOUSTICS (a subject of active research in relation with sonar detection and the design of noiseless ships), SEISMO-ACOUSTICS (of concern to earthquake science and engineering, and also to those doing underground prospection like searching for petroleum), AEROACOUSTICS (which includes the analysis of noise created by aircraft), COMPUTATIONAL METHODS, and SUPERCOMPUTING. In addition to the traditional issues and problems in computational methods, the journal also considers theoretical research acoustics papers which lead to large-scale scientific computations.