Analysis of ultrasound pulse-wave Doppler systems

Sidney Leeman; Nicholas Thomas; Andrew J. Healey

doi:10.1117/12.237793

11 April 1996 Analysis of ultrasound pulse-wave Doppler systems

Sidney Leeman, Nicholas Thomas, Andrew J. Healey

Proceedings Volume 2708, Medical Imaging 1996: Physics of Medical Imaging; (1996) https://doi.org/10.1117/12.237793
Event: Medical Imaging 1996, 1996, Newport Beach, CA, United States

Abstract

The aim of the investigation reported here is to clarify the way in which spectral-modifying artefacts, such as tissue attenuation, compromise pulse-wave Doppler measurements, and to accurately measure the magnitude of the corrupting influence of attenuation under controlled laboratory conditions. A theoretical description of the structure of the pulse-echo sequence from a moving scatterer field is constructed from first principles by utilizing a time-domain description of the Doppler process. It is demonstrated that the essential features of the echo signal may be rather more accurately described by a wavelet-, rather than by a Fourier-, transform, and that the power spectrum of the Doppler signal does not necessarily encode the range of the scatterer velocities present in the (pulse-echo) sampling volumes. The analysis provides a better understanding of the origins of the significant levels of noise present in pulse-wave Doppler signals, and allows a novel approach towards noise-reduction -- by zero manipulation in complex frequency space -- to be developed.

Citation Download Citation

Sidney Leeman, Nicholas Thomas, and Andrew J. Healey "Analysis of ultrasound pulse-wave Doppler systems", Proc. SPIE 2708, Medical Imaging 1996: Physics of Medical Imaging, (11 April 1996); https://doi.org/10.1117/12.237793

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