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Proceedings Paper

Improved technique for Doppler angle correction by monitoring the vessel diameter
Author(s): Eduardo Jorge Valadares Oliveira; Vera Lucia da Silveira Nantes Button; Joaquim Miguel Maia; Eduardo Tavares Costa; Jorge André G. Albuquerque
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Paper Abstract

The Doppler velocimeter developed allows determining the angle between the ultrasonic beam and the velocity vector of the flow, and utilizes this angle to calculate the 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. The results showed that with this technique it is possible to accomplish measurement of blood flow and to reduce Doppler measurements subjectivity.

Paper Details

Date Published: 23 May 2003
PDF: 12 pages
Proc. SPIE 5035, Medical Imaging 2003: Ultrasonic Imaging and Signal Processing, (23 May 2003); doi: 10.1117/12.479895
Show Author Affiliations
Eduardo Jorge Valadares Oliveira, Univ. Estadual de Campinas (Brazil)
Agencia Nacional de Vigilancia Sanitaria (Brazil)
Vera Lucia da Silveira Nantes Button, Univ. Estadual de Campinas (Brazil)
Joaquim Miguel Maia, Ctr. Federal de Educacao Technologica do Parana (Brazil)
Eduardo Tavares Costa, Univ. Estadual de Campinas (Brazil)
Jorge André G. Albuquerque, Univ. Estadual de Campinas (Brazil)

Published in SPIE Proceedings Vol. 5035:
Medical Imaging 2003: Ultrasonic Imaging and Signal Processing
William F. Walker; Michael F. Insana, Editor(s)

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