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Type: Artigo de evento
Title: Improved Technique For Doppler Angle Correction By Monitoring The Vessel Diameter
Author: Oliveira E.J.V.
Button V.L.S.N.
Maia J.M.
Tavares Costa E.
Albuquerque J.A.G.
Abstract: The Doppier 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 Doppier 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.
Rights: aberto
Identifier DOI: 10.1117/12.479895
Date Issue: 2003
Appears in Collections:Unicamp - Artigos e Outros Documentos

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