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Nonlinear propagation in Doppler ultrasound
S Li1, W N McDicken, P R Hoskins
1Department of Medical Physics and Medical Engineering, University of Edinburgh, Royal Infirmary, UK.
Ultrasound in Medicine & Biology
|January 1, 1993
Summary
Nonlinear ultrasound propagation was studied using Doppler machines. Despite observed pulse waveform distortion, nonlinear effects did not impact Doppler spectrum measurements in flow or string phantoms.
Area of Science:
- Medical Imaging
- Acoustics
- Biomedical Engineering
Background:
- Nonlinear ultrasound propagation can alter acoustic wave characteristics.
- Understanding these effects is crucial for accurate diagnostic ultrasound measurements.
Purpose of the Study:
- To investigate the impact of nonlinear ultrasound propagation on Doppler measurements.
- To assess whether nonlinear distortion affects Doppler spectral analysis.
Main Methods:
- Demonstrated nonlinear ultrasound propagation using Doppler transducers on commercial duplex ultrasound machines.
- Evaluated the influence of nonlinearity on Doppler measurements using a flow phantom and a string phantom.
Main Results:
- Pulse waveforms exhibited varying degrees of nonlinear distortion.
- No detectable effect of nonlinearity was observed on the received Doppler spectrum.
- Maximum frequency and Doppler spectral profile remained unaffected by nonlinear propagation.
Conclusions:
- Nonlinear ultrasound propagation, while distorting waveforms, does not significantly influence Doppler spectral measurements in typical phantom setups.
- Current Doppler measurement techniques appear robust against the nonlinear effects studied.