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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Guidelines for Finite-Element Modeling of Acoustic Radiation Force-Induced Shear Wave Propagation in Tissue-Mimicking Media
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Guidelines for Finite-Element Modeling of Acoustic Radiation Force-Induced Shear Wave Propagation in Tissue-Mimicking Media

机译：组织模仿介质中声辐射力引起的剪切波传播的有限元建模准则

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摘要

Ultrasound shear wave elastography is emerging as an important imaging modality for evaluating tissue material properties. In its practice, some systematic biases have been associated with ultrasound frequencies, focal depths and configuration, and transducer types (linear versus curvilinear), along with displacement estimation and shear wave speed estimation algorithms. Added to that, soft tissues are not purely elastic, so shear waves will travel at different speeds depending on their spectral content, which can be modulated by the acoustic radiation force (ARF) excitation focusing, duration, and the frequency-dependent stiffness of the tissue. To understand how these different acquisition and material property parameters may affect the measurements of shear wave velocity, the simulations of the propagation of shear waves generated by ARF excitations in viscoelastic media are a very important tool. This paper serves to provide an in-depth description of how these simulations are performed. The general scheme is broken into three components: 1) simulation of the 3-D ARF push beam; 2) applying that force distribution to a finite-element model; and 3) extraction of the motion data for post-processing. All three components will be described in detail and combined to create a simulation platform that is powerful for developing and testing algorithms for academic and industrial researchers involved in making quantitative shear-wave-based measurements of tissue material properties.
机译：超声剪切波弹性成像正在成为一种重要的成像方式，用于评估组织材料的特性。在实践中，一些系统性偏差已与超声频率，焦深和配置以及换能器类型（线性与曲线）以及位移估计和剪切波速度估计算法相关联。除此之外，软组织并非纯粹是弹性的，因此剪切波将根据其频谱含量以不同的速度传播，这可以通过声辐射力（ARF）激发聚焦，持续时间和频率的刚度来进行调制。组织。为了理解这些不同的采集和材料特性参数如何影响剪切波速度的测量，模拟由ARF激发产生的剪切波在粘弹性介质中的传播是非常重要的工具。本文旨在提供有关如何执行这些仿真的深入描述。通用方案分为三个部分：1）3-D ARF推力束的仿真； 2）将力分布应用于有限元模型； 3）提取运动数据以进行后处理。将详细描述这三个组件，并将它们组合起来以创建一个仿真平台，该平台对于为参与组织材料特性的定量剪切波基测量的学术和工业研究人员开发和测试算法具有强大的功能。

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