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Title: Non-circular orifice flowfields in valvular regurgitation
Authors: Green, Derek W. 
Myers, Jerry G. 
Anayiotos, Andreas 
Keywords: Biomechanics
Flow meters
Issue Date: 1995
Publisher: ASME
Source: ASME International Mechanical Congress and Exposition, 1995, San Francisco, United States
Abstract: The proximal flowfield (PFF) is a primary tool in quantifying valvular regurgitation when using Color Doppler Ultrasound (CDU) in-vivo. Regurgitant flow calculations are made using the proximal isovelocity surface area (PISA) method and the aliasing technique such that flow rate = V alias*(PISA). However, the actual PFF in non-circular orifices has not been extensively validated. In this study, the PFFs for circular and non-circular orifices are compared in-vitro by Laser Doppler Velocimetry (LDV) and CDU. This comparison defines the details of the PFF, and may prove useful in quantifying valvular regurgitation independent of orifice shape.
Rights: © ASME
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