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Proceedings Paper

Analysis of ultrasound pulse-wave Doppler systems
Author(s): Sidney Leeman; Nicholas Thomas; Andrew J. Healey
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Paper 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.

Paper Details

Date Published: 11 April 1996
PDF: 4 pages
Proc. SPIE 2708, Medical Imaging 1996: Physics of Medical Imaging, (11 April 1996); doi: 10.1117/12.237793
Show Author Affiliations
Sidney Leeman, King's College London (United Kingdom)
Nicholas Thomas, King's College London (United Kingdom)
Andrew J. Healey, King's College London (United Kingdom)

Published in SPIE Proceedings Vol. 2708:
Medical Imaging 1996: Physics of Medical Imaging
Richard L. Van Metter; Jacob Beutel, Editor(s)

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