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Computer determination of left ventricular volume using videodensitometry

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Abstract

The time course of left ventricular volume is obtained through computer processing of videoangiographic data. The analysis is based on the theory of X-ray absorption, where the intensity of the single plane image yields the third dimension information. Consequently, a detailed boundary detection of the chamber walls is not required. A TV-computer interface is described which converts, in real time, the desired portion of the TV image. The videodensitometry approach requires uniform opacification, thus the clinical protocol entails upstream injections of dye. This procedure eliminates the undesirable reactions and transients associated with left ventricular injections of dye, and a greater number of heart cycles of data are available for analysis.

A limited comparative study of this densitometric technique vs. the area-length method and Arvidsson's ellipsoid model showed considerable correlation.

Sommaire

La période de temps du volume du ventricule gauche est obtenue par le traitement par ordinateur des dates videoangiographiques. L'analyse est basée sur la théorie de l'absorption de rayons-X, ou l'intensité de l'image d'un seul plan produit l'information de la troisième dimension. Par conséquent, une détection détaillée des limites des parois de la chambre n'est pas exigée. On décrit une interface TV-ordinateur qui convertit en temps réel la portion désirée de l'image TV. L'approche par videodensitométrie exigeait une opacification uniforme; ainsi le protocole clinique impose une injection de colorant, dirigée contre le courant. Ce procédé élimine les réactions indésirables et transitoires associées avec des injections de colorant dans le ventricule gauche et un plus grand nombre de cycles des dates du coeur sont disponibles pour l'analyse.

Une étude comparative limitée de la technique videodensitométrique comparée avec la méthode de la longueur de la région et le modèle ellipsoide de Arvidsson montra une corrélation considérable.

Zusammenfassung

Der Zeitverlauf des linken Kammervolumens wird durch Computerverarbeitung video-vasographischer Daten erhalten. Die Analyse gründet sich auf die Theorie der Röntgenstrahlabsorption, in der die Intensität des Bildes der einfachen Ebene die Information über die dritte Dimension ergibt. Eine genaue Feststellung der Begrenzung der Kammerwände ist daher nicht erforderlich. Ein Fernseh-Computerinterface wird beschrieben, welches, in wirklicher Zeit, den gewünschten Teil des Fernsehbildes umwandelt. Die video-densimetrische Annäherung erfordert gleichförmiges Trübwerden, das klinische Protokoll enthält daher Einspritzen von Farbstoff stromaufwärts. Dieses Verfahren beseitigt die unerwünschten Gegenwirkungen und Übergangserscheinungen, die mit Injektionen von Farbstoff für die linke Kammer verbunden sind, und eine grössere Zahl von Kreisläufen des Herzens in Daten sind zur Analyse erhältlich.

Ein begrenztes Vergleichsstudium dieses densitometrischen Verfahrens mit dem Flächen-Längen Verfahren und Arvidsson's elliptischem Modell zeigte beträchtlich Korrelation.

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Authors and Affiliations

  1. Department of Surgery, University of Manitoba, Winnipeg, Canada

    B. G. Trenholm & D. A. Winter

  2. Department of Medicine, University of Manitoba, Winnipeg, Canada

    D. Mymin

  3. Department of Radiology, University of Manitoba, Winnipeg, Canada

    E. L. Lansdown

Authors
  1. B. G. Trenholm
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  2. D. A. Winter
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  3. D. Mymin
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  4. E. L. Lansdown
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Trenholm, B.G., Winter, D.A., Mymin, D. et al. Computer determination of left ventricular volume using videodensitometry. Med. & biol. Engng. 10, 163–173 (1972). https://doi.org/10.1007/BF02474106

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  • DOI: https://doi.org/10.1007/BF02474106

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