Document Detail

Effect of vessel curvature on Doppler derived velocity profiles and fluid flow.
MedLine Citation:
PMID:  15866416     Owner:  NLM     Status:  MEDLINE    
Side-branches and curvatures in the arterial tree yield deviations from the axial oriented velocity. Velocity or volume flow estimates based on the assumption that flow is axially oriented are of limited value at these sites. This article evaluates information obtainable by using a multigate Doppler ultrasound (US) instrument used with curved phantoms, which resemble the human coronary arteries. The comparison of experimental velocity data with data provided by an accurate computational fluid dynamics (CFD) method shows differences in the range of 4 to 11% for four curvatures with different radii. Multigate data are also used to estimate the volume flow in the curved segments at different experimental conditions. An error lower than 15% is obtained, to be compared with a 24% error obtained by assuming a parabolic velocity profile. In particular, it is shown that the residual error is not related to the small deviation of the velocity vectors from the axial direction due to the presence of secondary velocity components, which are found to be of magnitude less than 10% with respect to the axial velocity component.
R Krams; G Bambi; F Guidi; F Helderman; A F W van der Steen; P Tortoli
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Ultrasound in medicine & biology     Volume:  31     ISSN:  0301-5629     ISO Abbreviation:  Ultrasound Med Biol     Publication Date:  2005 May 
Date Detail:
Created Date:  2005-05-03     Completed Date:  2005-10-13     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0410553     Medline TA:  Ultrasound Med Biol     Country:  England    
Other Details:
Languages:  eng     Pagination:  663-71     Citation Subset:  IM    
Department of Biomedical Engineering, Erasmus MC, Erasmus University Rotterdam, PO Box 1738, 3000 DR Rotterdam, The Netherlands.
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MeSH Terms
Arteriosclerosis / pathology,  physiopathology,  ultrasonography
Blood Flow Velocity / physiology*
Computer Simulation
Coronary Circulation / physiology
Coronary Vessels / anatomy & histology,  physiology,  ultrasonography*
Image Processing, Computer-Assisted / methods
Models, Cardiovascular
Phantoms, Imaging
Ultrasonography, Doppler*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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