粘弹性
有损压缩
横波
弹性成像
有限元法
剪切(地质)
波传播
无损压缩
物理
声辐射力
声学
计算机科学
机械
光学
材料科学
算法
热力学
超声波
人工智能
复合材料
数据压缩
作者
Fernando Zvietcovich,Natalie Baddour,Jannick P. Rolland,Kevin J. Parker
标识
DOI:10.1088/1361-6560/aaf59a
摘要
Many approaches to elastography incorporate shear waves; in some systems these are produced by acoustic radiation force (ARF) push pulses. Understanding the shape and decay of propagating shear waves in lossy tissues is key to obtaining accurate estimates of tissue properties, and so analytical models have been proposed. In this paper, we reconsider a previous analytical model with the goal of obtaining a computationally straightforward and efficient equation for the propagation of shear waves from a focal push pulse. Next, this model is compared with an experimental optical coherence tomography (OCT) system and with finite element models, in two viscoelastic materials that mimic tissue. We find that the three different cases—analytical model, finite element model, and experimental results—demonstrate reasonable agreement within the subtle differences present in their respective conditions. These results support the use of an efficient form of the Hankel transform for both lossless (elastic) and lossy (viscoelastic) media, and for both short (impulsive) and longer (extended) push pulses that can model a range of experimental conditions.
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