M. Ojha, PhD, K. W. Johnston, MD, FRCS(C), R. S. C. Cobbold, PhD, R. L

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Presentation transcript:

Potential limitations of center-line pulsed Doppler recordings: An in vitro flow visualization study M. Ojha, PhD, K.W. Johnston, MD, FRCS(C), R.S.C. Cobbold, PhD, R.L. Hummel, PhD Journal of Vascular Surgery Volume 9, Issue 4, Pages 515-520 (April 1989) DOI: 10.1016/0741-5214(89)90466-7 Copyright © 1989 Society for Vascular Surgery and International Society for Cardiovascular Surgery, North American Chapter Terms and Conditions

Fig. 1 Schematic representation of major components of in vitro flow visualization system. Journal of Vascular Surgery 1989 9, 515-520DOI: (10.1016/0741-5214(89)90466-7) Copyright © 1989 Society for Vascular Surgery and International Society for Cardiovascular Surgery, North American Chapter Terms and Conditions

Fig. 2 Volumetric flow waveform with photographs of velocity profiles at peak flow and at 48, 80, and 120 msec thereafter. Large arrowheads indicate points at which the laser beam enters the fluid. Journal of Vascular Surgery 1989 9, 515-520DOI: (10.1016/0741-5214(89)90466-7) Copyright © 1989 Society for Vascular Surgery and International Society for Cardiovascular Surgery, North American Chapter Terms and Conditions

Fig. 3 Geometry of stenosis: a, axisymmetric plan view; b, asymmetric cross-sectional view (plan view same as a). Journal of Vascular Surgery 1989 9, 515-520DOI: (10.1016/0741-5214(89)90466-7) Copyright © 1989 Society for Vascular Surgery and International Society for Cardiovascular Surgery, North American Chapter Terms and Conditions

Fig. 4 Drawing made from original photographs illustrates poststenotic flow patterns for both 65% and 75% axisymmetric stenoses. Flow velocity profiles are typical of those observed between peak flow and 80 msec thereafter. Both 65% and 75% stenoses generate similar flow patterns; drawing shows essential features of both. Journal of Vascular Surgery 1989 9, 515-520DOI: (10.1016/0741-5214(89)90466-7) Copyright © 1989 Society for Vascular Surgery and International Society for Cardiovascular Surgery, North American Chapter Terms and Conditions

Fig. 5 Drawings made from original photographs illustrate flow patterns downstream of (a) the 38% asymmetric and (b) the 45% axisymmetric stenoses: The arrows indicate the positions of disturbed flow structures. The flow velocity profiles are typical of those observed between peak flow and 80 msec thereafter. Journal of Vascular Surgery 1989 9, 515-520DOI: (10.1016/0741-5214(89)90466-7) Copyright © 1989 Society for Vascular Surgery and International Society for Cardiovascular Surgery, North American Chapter Terms and Conditions

Fig. 6 Peak center-line velocity versus percentage area reduction for the different stenoses, shown fitted to a straight line. Journal of Vascular Surgery 1989 9, 515-520DOI: (10.1016/0741-5214(89)90466-7) Copyright © 1989 Society for Vascular Surgery and International Society for Cardiovascular Surgery, North American Chapter Terms and Conditions