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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >A Frequency-Shift Method to Measure Shear-Wave Attenuation in Soft Tissues
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A Frequency-Shift Method to Measure Shear-Wave Attenuation in Soft Tissues

机译：一种测量软组织剪切波衰减的频移方法

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摘要

In vivo quantification of shear-wave attenuation in soft tissues may help to better understand human tissue rheology and lead to new diagnostic strategies. Attenuation is difficult to measure in acoustic radiation force elastography because the shear-wave amplitude decreases due to a combination of diffraction and viscous attenuation. Diffraction correction requires assuming a cylindrical wavefront and an isotropic propagation medium, which may not be the case in some applications. In this paper, the frequency-shift method, used in ultrasound imaging and seismology, was adapted for shear-wave attenuation measurement in elastography. This method is not sensitive to diffraction effects. For a linear frequency dependence of the attenuation, a closed-form relation was obtained between the decrease in the peak frequency of the gamma-distributed wave amplitude spectrum and the attenuation coefficient of the propagation medium. The proposed method was tested against a plane-wave reference method in homogeneous agar–gelatin phantoms with 0%, 10%, and 20% oil concentrations, and hence different attenuations of 0.117, 0.202, and 0.292 Np⋅m−1 /Hz, respectively. Applicability to biological tissues was demonstrated with two ex vivo porcine liver samples (0.79 and 1.35 Np⋅m−1 /Hz) and an in vivo human muscle, measured along (0.43 Np⋅m−1 /Hz) and across (1.77 Np⋅m−1 /Hz) the tissue fibers. In all cases, the data supported the assumptions of a gamma-distributed spectrum for the source and linear frequency attenuation for the tissue. This method provides tissue attenuation, which is relevant diagnostic information to model viscosity, in addition to shear-wave velocity used to assess elasticity. Data processing is simple and could be performed automatically in real time for clinical applications.
机译：体内对软组织中剪切波衰减的量化可能有助于更好地了解人体组织流变学，并导致新的诊断策略。在声辐射力弹性成像中难以测量衰减，因为剪切波振幅由于衍射和粘性衰减的组合而减小。衍射校正需要假设圆柱波前和各向同性的传播介质，在某些应用中可能并非如此。在本文中，将用于超声成像和地震学的频移方法适用于弹性成像中的剪切波衰减测量。该方法对衍射效应不敏感。对于衰减的线性频率依赖性，在伽马分布波振幅谱的峰值频率的减小与传播介质的衰减系数之间获得了封闭形式的关系。在油浓度分别为0％，10％和20％的均相琼脂-明胶模型中，针对平面波参考方法测试了所提出的方法，因此衰减分别为0.117、0.202和0.292 Np·m-1 / Hz，分别。用两个离体猪肝样品（0.79和1.35Np⋅m-1/ Hz）和一个体内人体肌肉（沿（0.43Np⋅m-1/ Hz）和跨（1.77Np⋅）测量，证明了对生物组织的适用性m-1 / Hz）组织纤维。在所有情况下，数据均支持源的伽马分布频谱和组织的线性频率衰减的假设。除了用于评估弹性的剪切波速度之外，该方法还提供组织衰减，这是与模型粘度相关的诊断信息。数据处理非常简单，可以针对临床应用实时自动执行。

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