title: Doppler color flow in echocardiography: analytical and in-vitro investigations of the quantitative relationship between orifice flow and color jet dimensions.
abstract: The goal of this investigation was to explore the relationship between orifice flow rate and the dimensions of the resulting color jet. Equations were derived which describe flow rate as a function of the color jet dimensions, instrument characteristics, and a coefficient which represents the unknown velocity profile across the jet. Experiments in which fluid was injected at a variety of flow rates via an assortment of orifice sizes into a compliant, axisymmetric chamber were performed for comparison with the analytical results. During each injection, orifice flow rate and color jet dimensions were recorded. The experimental results were closely predicted (r = 0.97) by an equation which expresses flow rate as a function of the ratio of the color jet area and color jet length, and with a coefficient which approximates that of a parabolic velocity profile.
authors.affiliation: Department of Radiology, University of Rochester School of Medicine and Dentistry, NY 14642.
authors.forename: J
authors.initials: J
authors.lastname: Holen
authors.forename: M
authors.initials: M
authors.lastname: Nanna
authors.forename: J
authors.initials: J
authors.lastname: Lockhart
authors.forename: R
authors.initials: R
authors.lastname: Waag
mesh_terms: D001783:Blood Flow Velocity; D015150:Echocardiography, Doppler; D008433:Mathematics; D008955:Models, Cardiovascular; D008961:Models, Structural; D012212:Rheology