Collier R J, Ntui J A
Electronic Engineering Laboratories, University of Kent, Canterbury, UK.
Med Eng Phys. 1994 Sep;16(5):379-83. doi: 10.1016/1350-4533(90)90004-r.
This paper contains the details of a new technique for measuring the mechanical phase constants of transverse waves in human tibia, in vivo. The measurements are made in the frequency range from 100 to 1000 Hz. The importance of these measurements is that healthy tibia has quite small phase delays along the bone at these frequencies. On the other hand, a fractured tibia has a large phase delay at the fracture site. This paper establishes a set of typical phase delays for a range of tibia so that subsequent measurements on fractured patients can be interpreted. It contains a description of the method of measuring the phase delay and a detailed analysis of errors. In particular, it includes an account of the phase delay through the soft tissues as well as the bone and how the former can be eliminated. It is not an exhaustive account of this topic but contains sufficient results to show that the measurements can be made relatively easily. Finally, there is a theoretical model which can be used to predict the phase shift. However, in order to use the model various other measurements are necessary and a direct measurement of phase is easier than using a model.
本文详细介绍了一种在体测量人体胫骨中横波机械相位常数的新技术。测量在100至1000赫兹的频率范围内进行。这些测量的重要性在于，在这些频率下，健康的胫骨沿骨骼的相位延迟相当小。另一方面，骨折的胫骨在骨折部位有较大的相位延迟。本文建立了一系列胫骨的典型相位延迟，以便对骨折患者的后续测量结果能够得到解释。它包含了测量相位延迟的方法描述以及误差的详细分析。特别是，它包括了穿过软组织以及骨骼的相位延迟情况，以及如何消除前者的影响。这并非对该主题的详尽阐述，但包含了足够的结果以表明测量相对容易进行。最后，有一个可用于预测相移的理论模型。然而，为了使用该模型，还需要进行各种其他测量，并且直接测量相位比使用模型更容易。
