Guha Anurup, Aynardi Michael, Shokouhi Parisa, Lissenden Cliff J
Department of Engineering Science & Mechanics, Penn State, United States.
Department of Orthopedics & Rehabilitation, Hershey Medical Center, Penn State, United States.
Ultrasonics. 2021 Jul;114:106407. doi: 10.1016/j.ultras.2021.106407. Epub 2021 Feb 21.
The propagation of ultrasonic guided waves in cortical bone has potential to inform medical caregivers about the condition of the bone structure. However, as waveguides, human long bones such as the tibia are complex in terms of their material behavior and their geometric features. They exhibit anisotropic elasticity and internal damping. For the first time, wave propagation is modelled in the irregular hollow tibial cross-section, which varies along its long axis. Semi-analytical, frequency domain, and time domain finite element analyses providing complimentary information about long-range wave propagation characteristics in such a waveguide are applied to the mid-diaphyseal region of a human tibia. Simulating the guided waves generated by a contact transducer, the signals received in axial transmission indicate the consistent presence of low phase velocity non-dispersive propagating modes. The guided waves capable of traveling long distances have strong potential for diagnosis of fracture healing.
超声导波在皮质骨中的传播能够为医护人员提供有关骨结构状况的信息。然而，作为波导，诸如胫骨之类的人体长骨在材料特性和几何特征方面较为复杂。它们表现出各向异性弹性和内部阻尼。首次对沿长轴变化的不规则空心胫骨横截面中的波传播进行建模。将提供关于此类波导中长程波传播特性补充信息的半解析、频域和时域有限元分析应用于人体胫骨的中骨干区域。通过模拟接触式换能器产生的导波，轴向传输中接收到的信号表明始终存在低相速度非色散传播模式。能够长距离传播的导波在骨折愈合诊断方面具有很大潜力。
