| Influence of the Coanda effect on color Doppler jet area and color encoding. In vitro studies using color Doppler flow mapping. | |
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MedLine Citation:
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PMID: 1728465 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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 less than 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 less than 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 less than 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. |
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Authors:
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K Chao; V A Moises; R Shandas; T Elkadi; D J Sahn; R Weintraub |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Circulation Volume: 85 ISSN: 0009-7322 ISO Abbreviation: Circulation Publication Date: 1992 Jan |
Date Detail:
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Created Date: 1992-02-06 Completed Date: 1992-02-06 Revised Date: 2007-11-14 |
Medline Journal Info:
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Nlm Unique ID: 0147763 Medline TA: Circulation Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 333-41 Citation Subset: AIM; IM |
Affiliation:
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Department of Pediatric Cardiology, University of California San Diego. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Coronary Circulation* Echocardiography, Doppler / methods* Humans Models, Cardiovascular* Observer Variation Reference Values Regression Analysis Surface Properties |
| Grant Support | |
ID/Acronym/Agency:
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R01-HL-43287/HL/NHLBI NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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