Flow convergence flow rates from 3-dimensional reconstruction of color Doppler flow maps for computing transvalvular regurgitant flows without geometric assumptions: An in vitro quantitative flow study

Détails

ID Serval
serval:BIB_3053A9492BC6
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Flow convergence flow rates from 3-dimensional reconstruction of color Doppler flow maps for computing transvalvular regurgitant flows without geometric assumptions: An in vitro quantitative flow study
Périodique
Journal of the American Society of Echocardiography
Auteur(s)
Li  X., Shiota  T., Delabays  A., Teien  D., Zhou  X., Sinclair  B., Pandian  N. G., Sahn  D. J.
ISSN
0894-7317 (Print)
Statut éditorial
Publié
Date de publication
12/1999
Volume
12
Numéro
12
Pages
1035-44
Notes
Comparative Study
In Vitro
Journal Article --- Old month value: Dec
Résumé
OBJECTIVE: This study was designed to develop and test a 3-dimensional method for direct measurement of flow convergence (FC) region surface area and for quantitating regurgitant flows with an in vitro flow system. BACKGROUND: Quantitative methods for characterizing regurgitant flow events such as flow convergence with 2-dimensional color flow Doppler imaging systems have yielded variable results and may not be accurate enough to characterize those more complex spatial events. METHOD: Four differently shaped regurgitant orifices were studied: 3 flat orifices (circular, rectangular, triangular) and a nonflat one mimicking mitral valve prolapse (all 4 orifice areas = 0.24 cm(2)) in a pulsatile flow model at 8 to 9 different regurgitant flow rates (10 to 50 mL/beat). An ultrasonic flow probe and meter were connected to the flow model to provide reference flow data. Video composite data from the color Doppler flow images of the FC were reconstructed after computer-controlled 180 degrees rotational acquisition was performed. FC surface area (S cm(2)) was calculated directly without any geometric assumptions by measuring parallel sliced flow convergence arc lengths through the FC volume and multiplying each by the slice thickness (2.5 to 3.2 mm) over 5 to 8 slices and then adding them together. Peak regurgitant flow rate (milliliters per second) was calculated as the product of 3-dimensional determined S (cm(2)) multiplied by the aliasing velocity (centimeters per second) used for color Doppler imaging. RESULTS: For all of the 4 shaped orifices, there was an excellent relationship between actual peak flow rates and 3-dimensional FC-calculated flow rates with the direct measurement of the surface area of FC (r = 0.99, mean difference = -7.2 to -0.81 mL/s, % difference = -5% to 0%), whereas a hemielliptic method implemented with 3 axial measurements of the flow convergence zone from 2-dimensional planes underestimated actual flow rate by mean difference = -39.8 to -18.2 mL/s, % difference = -32% to -17% for any given orifice. CONCLUSIONS: Three-dimensional reconstruction of flow based on 2-dimensional color Doppler may add quantitative spatial information, especially for complex flow events. Direct measurement of 3-dimensional flow convergence surface areas may improve accuracy for estimation of the severity of valvular regurgitation.
Mots-clé
Blood Flow Velocity Echocardiography, Doppler, Color/*methods *Echocardiography, Three-Dimensional Feasibility Studies Mitral Valve/*physiopathology/ultrasonography Mitral Valve Insufficiency/etiology/*physiopathology/ultrasonography Mitral Valve Prolapse/complications/physiopathology/ultrasonography Observer Variation *Phantoms, Imaging Severity of Illness Index Video Recording
Pubmed
Web of science
Création de la notice
28/01/2008 10:48
Dernière modification de la notice
20/08/2019 14:15
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