Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.14279/1694
Title: A numerical and experimental investigation of the flow acceleration region proximal to an orifice
Authors: Perry, Gilbert J. 
Myers, Jerry G. 
Anayiotos, Andreas 
metadata.dc.contributor.other: Αναγιωτός, Ανδρέας
Major Field of Science: Medical and Health Sciences
Keywords: Echocardiography;Ultrasonic imaging;Hemodynamics;Computer simulation;Blood flow Measurement
Issue Date: 1995
Source: Ultrasound in Medicine and Biology, 1995, vol. 21, no. 4, pp. 501-516
Volume: 21
Issue: 4
Start page: 501
End page: 516
Journal: Ultrasound in Medicine and Biology 
Abstract: ttempts to quantify valvular regurgitation have recently been focused on the proximal orifice flow field. A complete description of the proximal orifice flow field is provided in this investigation. A steady state in vitro model accessible by both color Doppler ultrasound (CDU) and laser Doppler velocimetry (LDV) was utilized. Velocities for varying flow rates and orifices were calculated by finite element modeling (FEM), by LDV and by CDU. The steady flow model was composed of circular orifices of 3, 5 and 10 mm diameters at flow rates from 0.7 to 10 L/min. Regurgitant flow rates were calculated from the proximal CDU data by two separate methods. The first approach utilized angle corrected velocities while the second approach utilized only velocities which did not require angle correction (centerline velocities). Both methods correlated well with known flow rates (y = 0.97x - 0.09, r = 0.98, SEE = 0.45, p < 0.0001; and y = 1.0x + 0.07, r = 0.99, SEE = 0.27, p < 0.0001, respectively) and were superior to results obtained by assuming a hemispherical geometry as is done in the aliasing technique. The methodology provides a complete analysis of the proximal flow field and involves fewer geometric assumptions than the aliasing approach. This may prove to be an advantage when analyzing in vivo flow fields with complex, uncertain geometry. Attempts to quantify valvular regurgitation have recently been focused on the proximal orifice flow field. This paper provides a complete description of this proximal orifice flow field. A steady state in vitro model accessible by both color Doppler ultrasound (CDU) and laser Doppler velocimetry (LDV) was utilized. Velocities for varying flow rates and orifices were calculated by finite element modeling (FEM), by LDV and by CDU.
URI: https://hdl.handle.net/20.500.14279/1694
ISSN: 0301-5629
DOI: 10.1016/0301-5629(94)00141-Y
Rights: © Elsevier
Type: Article
Affiliation: University of Alabama at Birmingham 
Affiliation : University of Alabama at Birmingham 
Birmingham Veteran's Administration Medical Center 
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