INFLUENCE OF THE COANDA EFFECT ON COLOR DOPPLER JET AREA AND COLOR ENCODING - INVITRO STUDIES USING COLOR DOPPLER FLOW MAPPING

被引:50
作者
KUNG, C [1 ]
MOISES, VA [1 ]
SHANDAS, R [1 ]
ELKADI, T [1 ]
SAHN, DJ [1 ]
WEINTRAUB, R [1 ]
机构
[1] UNIV CALIF SAN DIEGO,DEPT PEDIAT CARDIOL,LA JOLLA,CA 92093
关键词
SURFACE-ADHERENT JETS; DOPPLER ECHOCARDIOGRAPHY; VALVULAR REGURGITATION;
D O I
10.1161/01.CIR.85.1.333
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
We studied surface adherence and its effects on color Doppler jet areas and color encoding in an in vitro model with a noncompliant receiving chamber into which a steady flow jet was directed parallel to either a straight or a curved surface adjacent to and 4 mm away from the inflow orifice (1.50 mm2) with the control condition being a free jet matched for flow rates and driving pressures. Jets were imaged perpendicular to the plane of the surface, the plane in which most clinical images of jet-surface interactions are obtained. Ten different flow rates ranging from 0.13 to 0.30 l/min were used. Surface-adherent jet areas were smaller than control jets for every driving pressure-volume combination (paired t test, p < 0.01). Computer analysis of color Doppler images showed more green and blue (reverse flow) pixels on the surface side of the adherent jets than the control jets (p < 0.05), suggesting that viscous energy loss and flow deceleration and reversal play a role in the jet-surface interaction. Analysis of variance demonstrated that linear regression slopes of flow rate versus jet area for surface jets were lower (slopes, 11-21 cm2/l/min; r = 0.95-0.97) than those for the control (slope, 33 cm2/l/min; r = 0.97) (p < 0.0001). Surface adherence (Coanda effect) influences jet size and color encoding, causing smaller color Doppler jet areas and greater variance and reverse velocity encoding.
引用
收藏
页码:333 / 341
页数:9
相关论文
共 56 条
[1]  
ABRAMOVICH GN, 1963, THEOYR TURBULENT JET, P173
[2]  
AGGARWAL K K, 1988, Journal of the American College of Cardiology, V11, p98A
[3]   The velocity-distribution in a liquid-into-liquid jet [J].
Andrade, END ;
Tsien, LC .
PROCEEDINGS OF THE PHYSICAL SOCIETY, 1937, 49 :381-391
[4]   VORTEX EVOLUTION IN A ROUND JET [J].
BECKER, HA ;
MASSARO, TA .
JOURNAL OF FLUID MECHANICS, 1968, 31 :435-&
[5]  
Blevins, 1984, APPLIED FLUID DYNAMI, P1
[6]   COMPUTER-ANALYSIS OF DOPPLER COLOR FLOW MAPPING IMAGES FOR QUANTITATIVE ASSESSMENT OF INVITRO FLUID JETS [J].
BOLGER, AF ;
EIGLER, NL ;
PFAFF, JM ;
RESSER, KJ ;
MAURER, G .
JOURNAL OF THE AMERICAN COLLEGE OF CARDIOLOGY, 1988, 12 (02) :450-457
[7]   QUANTIFYING VALVULAR REGURGITATION - LIMITATIONS AND INHERENT ASSUMPTIONS OF DOPPLER TECHNIQUES [J].
BOLGER, AF ;
EIGLER, NL ;
MAURER, G .
CIRCULATION, 1988, 78 (05) :1316-1318
[8]   DENSITY EFFECTS AND LARGE STRUCTURE IN TURBULENT MIXING LAYERS [J].
BROWN, GL ;
ROSHKO, A .
JOURNAL OF FLUID MECHANICS, 1974, 64 (JUL24) :775-&
[9]   ADJACENT SOLID BOUNDARIES ALTER THE SIZE OF REGURGITANT JETS ON DOPPLER COLOR FLOW MAPS [J].
CAPE, EG ;
YOGANATHAN, AP ;
WEYMAN, AE ;
LEVINE, RA .
JOURNAL OF THE AMERICAN COLLEGE OF CARDIOLOGY, 1991, 17 (05) :1094-1102
[10]  
CHEN C, 1966, CIRCULATION S2, V214, P84