PMID: 6397885Sep 1, 1984Paper

Computer based pattern recognition of carotid artery Doppler signals for disease classification: prospective validation

Ultrasound in Medicine & Biology
Y E LangloisD E Strandness

Abstract

A computer based pattern recognition method has been developed to classify the percent diameter reduction in nonoccluded internal carotid arteries. Using a combined B-mode/pulsed Doppler unit, the system utilizes spectral waveforms obtained from the low common and proximal internal carotid artery locations. The ECG-R wave is used as a time reference to synchronize the averaging of Doppler spectra from 20 heart cycles. An averaged waveform is generated and represents the spectral data from which features are extracted for analysis. A stepwise selection algorithm identifies a feature subset for partitioning the entire range of disease into two states, less than and greater than a decision point. Three such partitions are made, leading to the following categories: Normal, 1-20, 21-50 and 51-99% dia. reduction. A classifier was trained, tested prospectively against unknown data and the results compared to angiography. Of the 170 vessels tested, 141 (82%) were classified in the same category by angiography and the computer system. Agreement for each category was 93% (27/29) for the normals, 81.5% (44/54) for the 1-20% lesions, 78% (29/37) for the 21-50% lesions and 82% (41/50) for the 51-99% lesions. The computer method and angiogra...Continue Reading

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Citations

Sep 1, 1989·Medical & Biological Engineering & Computing·K Kaluzynski, A Tedgui
Jan 1, 1990·Medical & Biological Engineering & Computing·C Di GiuliomariaE Zanette
Mar 1, 1992·Medical & Biological Engineering & Computing·G CloutierL G Durand
Sep 1, 1989·Medical & Biological Engineering & Computing·H L BaranekL G Durand
Mar 9, 2004·Journal of Clinical Periodontology·Nicolas A RavonG Rutger Persson
Oct 1, 1987·Ultrasound in Medicine & Biology·W J Zwiebel
Oct 1, 1987·Ultrasound in Medicine & Biology·T R KohlerD E Strandness
Jan 1, 1988·Ultrasound in Medicine & Biology·S E Rittgers, D Y Fei
Jun 1, 1986·Ultrasound in Medicine & Biology·D E Strandness
Apr 1, 1993·Clinical Cardiology·B F WallerJ D Slack
Feb 1, 1989·Clinical Physics and Physiological Measurement : an Official Journal of the Hospital Physicists' Association, Deutsche Gesellschaft Für Medizinische Physik and the European Federation of Organisations for Medical Physics·S B Sherriff, D C Barber
Feb 1, 1990·Clinical Physics and Physiological Measurement : an Official Journal of the Hospital Physicists' Association, Deutsche Gesellschaft Für Medizinische Physik and the European Federation of Organisations for Medical Physics·P R Hoskins
Sep 4, 1999·Physiological Measurement·D W HoldsworthB K Rutt
May 1, 1991·Clinical Physics and Physiological Measurement : an Official Journal of the Hospital Physicists' Association, Deutsche Gesellschaft Für Medizinische Physik and the European Federation of Organisations for Medical Physics·C A Bastos, P J Fish

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