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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Sol-gel transition in agar-gelatin mixtures studied with transient elastography
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Sol-gel transition in agar-gelatin mixtures studied with transient elastography

机译：瞬时弹性成像研究琼脂-明胶混合物中的溶胶-凝胶转变

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Using the shear wave propagation in solids, the transient elastography technique has been developed to assess the elastic properties of soft tissues. Here, a new approach of transient elastography allows assessing the viscoelastic properties of soft tissues. In this paper, the method is used to follow-up the sol-gel transition of an agar-gelatin mixture noninvasively. The shear wave velocity and shear wave attenuation through the mixture were continuously monitored in the audible range of frequencies (from 50 Hz to 200 Hz). The observed changes in velocities and attenuations as a function of frequency confirmed the validity of the Voigt's model to describe the gel at its stable mechanical state. By a simple inverse problem approach, based on the one-dimensional (1-D) Helmholtz equation, the elasticity and the viscosity of such a mixture were recovered as a function of time. The results obtained are in good agreement with the literature and theoretical predictions. Overall, they demonstrate the high sensitivity of the transient elastography measurements to the rheological parameter changes in agar-gelatin mixtures during gelation.
机译：利用剪切波在固体中的传播，已经开发出瞬态弹性成像技术来评估软组织的弹性。在这里，一种新的瞬时弹性成像方法可以评估软组织的粘弹性。在本文中，该方法用于无创地跟踪琼脂-明胶混合物的溶胶-凝胶转变。在可听到的频率范围（50 Hz至200 Hz）中，连续监测通过混合物的剪切波速度和剪切波衰减。观察到的速度和衰减随频率的变化，证实了Voigt模型在稳定的机械状态下描述凝胶的有效性。通过简单的反问题方法，基于一维（1-D）亥姆霍兹方程，可以恢复这种混合物的弹性和粘度随时间的变化。获得的结果与文献和理论预测非常吻合。总体而言，他们证明了瞬时弹性成像测量对胶凝过程中琼脂-明胶混合物流变参数变化的高度敏感性。

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