PMID: 7941102Jan 1, 1994Paper

A real-time and fine resolution analyser used to estimate the instantaneous energy distribution of Doppler signals

Ultrasound in Medicine & Biology
L Fan, D H Evans

Abstract

Doppler ultrasound signal analysers in current use require that the signal be stationary within the time interval of processing, and yield average results for that interval. A real-time instantaneous frequency analyser based on the Wigner distribution function (WDF) has been developed, which provides a means of analysing time-varying signals or signals with short stationary time periods, and also produces results with very high instantaneous temporal resolution without causing significant deterioration of frequency resolution. In addition to the real-time processing, the most recent 2.4 s of Doppler signal is stored in the analyser so that the operator can perform further fine analysis and obtain results with very high resolutions in both the time and frequency domains. The pseudo-instantaneous mean frequency (PIMF) and the Pseudo-Instantaneous Power Distribution (PIPD) are calculated and displayed every 4.0 ms in the real-time processing mode, and with a resolution of between 80 microseconds and 2 ms in the fine resolution analysis mode. The analyser utilises an algorithm developed so that the WDF can be calculated efficiently using the conventional Fast Fourier Transform (FFT) method, and the PIPDs are calculated from data th...Continue Reading

Citations

Apr 16, 1998·Medical & Biological Engineering & Computing·P J FishW N McDicken
Sep 28, 2007·Annals of Biomedical Engineering·Andreas VossHans R Figulla
Jan 1, 1997·Ultrasound in Medicine & Biology·J L SmithA R Naylor
Sep 21, 2000·European Journal of Ultrasound : Official Journal of the European Federation of Societies for Ultrasound in Medicine and Biology·N Aydin, H S Markus
Mar 11, 2011·Journal of Neurosurgical Anesthesiology·Jeffrey J Pasternak, William L Lanier
Dec 1, 1995·Stroke; a Journal of Cerebral Circulation·J L SmithA R Naylor
Mar 20, 1998·Stroke; a Journal of Cerebral Circulation·E B RingelsteinM Siebler
Jul 27, 1999·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·T Anderson, W N McDicken

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