Li S, McDicken W N, Hoskins P R
Department of Medical Physics and Medical Engineering, University of Edinburgh, Royal Infirmary, UK.
Ultrasound Med Biol. 1993;19(5):359-64. doi: 10.1016/0301-5629(93)90054-r.
The nonlinear propagation of ultrasound was demonstrated using Doppler transducers on two commercial duplex machines. The influence of nonlinear propagation on Doppler measurements was studied on both a flow phantom and a string phantom. It was found that although the pulse waveforms showed clearly different degrees of nonlinear distortion, no effect due to the nonlinearity could be detected on the received Doppler spectrum both in terms of the maximum frequency or underlying Doppler spectral profile.
使用两台商用双功能超声诊断仪上的多普勒换能器演示了超声的非线性传播。在血流模拟体和绳索模拟体上研究了非线性传播对多普勒测量的影响。结果发现，尽管脉冲波形显示出明显不同程度的非线性失真，但无论是在最大频率还是在基础多普勒频谱轮廓方面，均未在接收到的多普勒频谱上检测到非线性带来的影响。
