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Proceedings Paper

Improved technique for blood flow velocity measurement using Doppler effect
Author(s): Eduardo Jorge Valadares Oliveira; Vera Lucia da Silveira Nantes Button; Joaquim Miguel Maia; Eduardo Tavares Costa
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Paper Abstract

The Doppler velocimeter developed allows to determine the angle between the ultrasonic beam and the velocity vector of the flow, and to calculate the precise blood flow in a vessel. Four piezoelectric transducers constitute the Doppler velocimeter. Three of these transducers are positioned to form an equilateral triangle (base of a pyramid). When these transducers move simultaneously, backward or forward from the initial position, the emitted ultrasonic beams focalize on a position (peak of the pyramid) closer or farther from the transducers faces, according to the depth of the vessel where we intend to measure de flow. The angle between the transducers allows adjusting the height of this pyramid and the position of the focus (where the three beams meet). A forth transducer is used to determine the diameter of the vessel and monitor the position of the Doppler velocimeter relative to the vessel. Simulation results showed that with this technique is possible to accomplish precise measurement of blood flow.

Paper Details

Date Published: 11 April 2002
PDF: 9 pages
Proc. SPIE 4687, Medical Imaging 2002: Ultrasonic Imaging and Signal Processing, (11 April 2002); doi: 10.1117/12.462174
Show Author Affiliations
Eduardo Jorge Valadares Oliveira, Univ. Estadual de Campinas (Brazil)
Vera Lucia da Silveira Nantes Button, Univ. Estadual de Campinas (Brazil)
Joaquim Miguel Maia, Univ. Estadual de Campinas (Brazil)
Eduardo Tavares Costa, Univ. Estadual de Campinas (Brazil)


Published in SPIE Proceedings Vol. 4687:
Medical Imaging 2002: Ultrasonic Imaging and Signal Processing
Michael F. Insana; William F. Walker, Editor(s)

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