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Lookup NU author(s): Dr Timothy Irvine,
Dr Antoinette Kenny
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Background: Conventional 2-dimensional Doppler methods for the quantitation of laminar flows in large vessels are prone to inaccuracy Three-dimensional (3D) volume imaging provides the opportunity to make cross-sectional now calculations through digital spatiotemporal integration of flow velocity, area, and profile. Methods: A new digital 3D color Doppler reconstruction method was used to generate radially acquired now data sets. Raw scanline data with digital velocity assignments, obtained by scanning parallel to flow, were transferred from a specially programmed but otherwise conventional ultrasonographic system, which controlled a multiplane transesophageal probe, to a computer workstation via an Ethernet link for assimilation into color 3D data sets. This configuration was used to study 20 pulsatile laminar flows (stroke volumes 30 to 70 mL and peak now rates 65 to 205 mL/s) in a curved tube model with an oval cross-sectional geometry. After generation of the color 3D data set, now velocity values from cross sections perpendicular to the tubes were analyzed to determine flow rate and stroke volume. Results: The flows from 3D digital velocity profiles showed close correlation with peak instantaneous now rates (r = 0.99, y = 1.01x - 0.9, standard error of estimate 4.1 mL/s). When interpreted with pulsed wave Doppler data obtained through the cardiac cycle, they also allowed computation of stroke volume (r = 0.98, y = 1.44x - 2.5, standard error of estimate 3.8 mL). Conclusion: The ability to compute laminar flows from 3D digital data sets obtained parallel to the direction of now and without the need for geometric assumptions represents an important opportunity for and advantage of 3D color Doppler echocardiography.
Author(s): Irvine T, Li XN, Mori Y, Wanitkun S, Li XK, Detmer PR, Martin RW, Pope A, Schwartz GA, Rusk RA, Kenny A, Sahn DJ
Publication type: Article
Publication status: Published
Journal: Journal of the American Society of Echocardiography
ISSN (print): 0894-7317
ISSN (electronic): 1097-6795
Publisher: Mosby, Inc.