PMID: 7538706Jan 1, 1995Paper

Changes in ultrasonic Doppler backscattered power downstream of concentric and eccentric stenoses under pulsatile flow

Ultrasound in Medicine & Biology
G CloutierL G Durand

Abstract

The main objective of the present work was to investigate, under pulsatile flow, the patterns of variation of the Doppler power backscattered by blood and Sephadex particles upstream and downstream of concentric and eccentric stenoses ranging from 47% to 91% area reduction. Doppler measurements were performed at 5 diameters upstream and 5, 10, 15 and 20 diameters downstream of the constriction. For the concentric 75% and 85%, and the eccentric 79% and 91% area reduction stenoses, a progressive increase of the power backscattered by red cell suspensions at 40% hematocrit was measured downstream of the narrowing. The maximal power usually occurred around 10 diameters after the stenosis and dropped further downstream. In addition to the increase in the power, a cyclic variation of the backscattered intensity was observed within the flow cycle. For the concentric 52% and eccentric 47% area reduction stenoses, no variation of the Doppler power was measured during flow acceleration and deceleration for all recording sites. A coefficient of correlation of 0.82 was measured between the percentage of area reduction and the ratio of the Doppler mean power at 10 diameters downstream to that at 5 diameters upstream of the stenoses. Using S...Continue Reading

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Citations

Jan 1, 1996·Ultrasound in Medicine & Biology·S J Wu, K K Shung
Oct 13, 2001·Ultrasound in Medicine & Biology·D G PaengK K Shung
Jan 1, 1996·Ultrasound in Medicine & Biology·Z Guo, A Fenster
Jan 1, 1997·Ultrasound in Medicine & Biology·P A BascomM Ojha
Nov 11, 1998·Ultrasound in Medicine & Biology·S J WuJ G Brasseur
Aug 1, 1996·Journal of Biomechanical Engineering·G CloutierL G Durand
Mar 18, 2008·Ultrasound in Medicine & Biology·Meghan L ThorneDavid W Holdsworth
Dec 10, 1999·Journal of the American Society of Echocardiography : Official Publication of the American Society of Echocardiography·J J MillerH Becher
Jun 1, 1996·IEEE Transactions on Bio-medical Engineering·P A Bascom, R S Cobbold
Jun 30, 2015·Ultrasound in Medicine & Biology·Julian Garcia-DuitamaGuy Cloutier
Jul 30, 2016·Ultrasound in Medicine & Biology·Kristoffer Lindskov HansenMichael Bachmann Nielsen
May 2, 2009·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·Dong-Guk PaengK Kirk Shung
May 13, 2017·Ultrasound in Medicine & Biology·Kristoffer Lindskov HansenMichael Bachmann Nielsen

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