Schmitz Dylan G, Thelen Darryl G, Cone Stephanie G
Department of Mechanical Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA.
Department of Biomedical Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA.
Micromachines (Basel). 2023 Dec 23;15(1):32. doi: 10.3390/mi15010032.
Shear wave tensiometry is a noninvasive method for directly measuring wave speed as a proxy for force in tendons during dynamic activities. Traditionally, tensiometry has used broadband excitation pulses and measured the wave travel time between two sensors. In this work, we demonstrate a new method for tracking phase velocity using shaped excitations and measurements from a single sensor. We observed modulation of phase velocity in the Achilles tendon that was generally consistent with wave speed measures obtained via broadband excitation. We also noted a frequency dependence of phase velocity, which is expected for dispersive soft tissues. The implementation of this method could enhance the use of noninvasive wave speed measures to characterize tendon forces. Further, the approach allows for the design of smaller shear wave tensiometers usable for a broader range of tendons and applications.
剪切波张力测定法是一种非侵入性方法，用于在动态活动期间直接测量波速，以此作为肌腱中力的替代指标。传统上，张力测定法使用宽带激励脉冲，并测量两个传感器之间的波传播时间。在这项工作中，我们展示了一种使用整形激励和单个传感器测量来跟踪相速度的新方法。我们观察到跟腱中的相速度调制，这通常与通过宽带激励获得的波速测量结果一致。我们还注意到相速度的频率依赖性，这在色散软组织中是预期的。这种方法的实施可以增强非侵入性波速测量在表征肌腱力方面的应用。此外，该方法允许设计更小的剪切波张力计，可用于更广泛的肌腱和应用。
