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Diffraction field of a low frequency vibrator in soft tissues using transient elastography

机译:瞬态弹性成像法分析低频振动器在软组织中的衍射场

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摘要

For the last 10 years, interest has grown in low frequency shear waves that propagate in the human body. However, the generation of shear waves by acoustic vibrators is a relatively complex problem, and the directivity patterns of shear waves produced by the usual vibrators are more complicated than those obtained for longitudinal ultrasonic transducers. To extract shear modulus parameters from the shear wave propagation in soft tissues, it is important to understand and to optimize the directivity pattern of shear wave vibrators. This paper is devoted to a careful study of the theoretical and the experimental directivity pattern produced by a point source in soft tissues. Both theoretical and experimental measurements show that the directivity pattern of a point source vibrator presents two very strong lobes for an angle around 35/spl deg/. This paper also points out the impact of the near field 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切变波越来越感兴趣。然而,由声振动器产生的剪切波是一个相对复杂的问题,并且由普通振动器产生的剪切波的方向性图案比对于纵向超声换能器所获得的方向性图案更为复杂。要从剪切波在软组织中的传播中提取剪切模量参数,重要的是了解和优化剪切波振子的方向性图。本文致力于对软组织中的点源所产生的理论和实验方向图进行仔细研究。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波瓣,其角度约为35 / spl deg /。本文还指出了近场对剪切波产生问题的影响。

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