A General Method of Determining the Frequency-Dependent Propagation Coefficient and Characteristic Impedance of an Artery in the Presence of Reflections

[+] Author and Article Information
C. D. Bertram

Centre for Biomedical Engineering, University of New South Wales, Kensington, Sydney, Australia 2033

S. E. Greenwald

Department of Morbid Anatomy, Royal London Hospital, London, England E1 1BB

J Biomech Eng 114(1), 2-9 (Feb 01, 1992) (8 pages) doi:10.1115/1.2895445 History: Received August 06, 1991; Revised September 30, 1991; Online March 17, 2008


An iterative method of calculating propagation parameters at harmonics of heart rate for a uniform vascular segment from a combination of four arterial waveform measurements is presented. Measurements of blood pressure, vascular diameter, and blood flow-rate may be combined arbitrarily provided only that at least one measurement of pressure and one of flow-rate be included; the requirement of four measurements implies at least two measurement sites along the vessel. The analysis is thus a generalization of those associated with previous methods of determining propagation parameters, allowing for instance relaxation of the requirement of equal spacing in the three-point method. Results are presented for the propagation of an impulse along a rubber tube when the measurements are pressure at two sites, flowrate and diameter.

Copyright © 1992 by The American Society of Mechanical Engineers
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