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Journal of Ultrasound in Medicine, Vol 20, Issue 12 1303-1311, Copyright © 2001 by American Institute of Ultrasound in Medicine

JOURNAL ARTICLE

Quantification of flow volume with a new digital three-dimensional color Doppler flow approach: an in vitro study

J. Li, X. Li, Y. Mori, R. A. Rusk, J. S. Lee, C. H. Davies, I. Hashimoto, G. O. El-Sedfy, X. N. Li and D. J. Sahn
Clinical Care Center for Congenital Heart Disease, Oregon Health Sciences University, Portland 97201-3098, USA.

OBJECTIVE: The quantification of flow stroke volume is important for evaluation of patients with cardiac dysfunction and cardiovascular disease. Three-dimensional digital color Doppler flow imaging allows the acquisition of flow data in an orientation approximately parallel to flow and analysis of the Doppler flow velocities perpendicular to flow (cross-sectional flow calculation). This in vitro study assessed the applicability of this method for quantifying cardiac output in a funnel-shaped tube model similar to mitral inflow or the left ventricular outflow tract. METHODS: A new digital three-dimensional color Doppler method was used to acquire Doppler flow information. Raw scan line data with digital velocity assignments were obtained on a conventional Doppler color flow imaging system with a 180 degrees rotating multiplanar transesophageal probe connected to a computer workstation. Nine stroke volumes (20-60 mL) with flow rates ranging from 1.5 to 5.28 L/min in a funnel-shaped pulsatile laminar flow model were studied. Three-dimensional flow rates were compared with standard-of-reference measurements of flow obtained from timed collection in a graduated cylinder and with an ultrasonic flow meter. RESULTS: Within the funnel tube, the flow volumes that were calculated from the first, second, and third depths and the average of all 3 depths correlated well with the actual flow rate (r = 0.97-0.99). Results from the middle and second levels and from the average of all 3 depths provided the closest fit to the actual flow rates (r = 0.99; y = 0.96x + 0.14; and r = 0.98; y = 1.14x - 0.43, respectively). CONCLUSIONS: Although a work in progress, this digital three-dimensional color Doppler flow measurement method is feasible, accurate, and simple, and it may offer in vivo evaluation of blood volume flow given a favorable orientation between the valve orifice and the scanning device.


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 Eur J EchocardiogrHome page
X. Li, M. Ashraf, K. Thiele, A. H. Bhat, R. Sakaguchi, J. C. Mitchell, J. A. Brie, M. Young, R. S. Bader, J. Pemberton, et al.
A novel method for the assessment of the accuracy of computing laminar flow stroke volumes using a real-time 3D ultrasound system: In vitro studies
Eur J Echocardiogr, December 1, 2005; 6(6): 396 - 404.
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Copyright © 2001 by the American Institute of Ultrasound in Medicine.