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Diffraction field of a low frequency vibrator in soft tissues usingtransient elastography

机译:瞬态弹性成像技术在低频振动器在软组织中的衍射场

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For the last 10 years, interest has grown in low frequency shearnwaves that propagate in the human body. However, the generation of shearnwaves by acoustic vibrators is a relatively complex problem, and thendirectivity patterns of shear waves produced by the usual vibrators arenmore complicated than those obtained for longitudinal ultrasonicntransducers. To extract shear modulus parameters from the shear wavenpropagation in soft tissues, it is important to understand and tonoptimize the directivity pattern of shear wave vibrators. This paper isndevoted to a careful study of the theoretical and the experimentalndirectivity pattern produced by a point source in soft tissues. Bothntheoretical and experimental measurements show that the directivitynpattern of a point source vibrator presents two very strong lobes for annangle around 35°. This paper also points out the impact of the nearnfield in the problem of shear wave generation
机译:在过去的十年中,人们对在人体中传播的低频剪切波越来越感兴趣。然而,由声振动器产生的剪切波是一个相对复杂的问题,因此,与纵向超声换能器相比,由普通振动器产生的剪切波的方向图不再复杂。要从软组织中的剪切波传播中提取剪切模量参数,重要的是了解并优化剪切波振子的指向性。本文致力于对点源在软组织中产生的理论和实验方向性模式的仔细研究。理论和实验测量均表明,点源振动器的方向性图呈现出两个非常强的凸角,分别围绕35°倾斜。本文还指出了近场对剪切波产生问题的影响。

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