11 April 2002 Improved technique for blood flow velocity measurement using Doppler effect
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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.
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Eduardo Jorge Valadares Oliveira, Eduardo Jorge Valadares Oliveira, Vera Lucia da Silveira Nantes Button, Vera Lucia da Silveira Nantes Button, Joaquim Miguel Maia, Joaquim Miguel Maia, Eduardo Tavares Costa, Eduardo Tavares Costa, } "Improved technique for blood flow velocity measurement using Doppler effect", Proc. SPIE 4687, Medical Imaging 2002: Ultrasonic Imaging and Signal Processing, (11 April 2002); doi: 10.1117/12.462174; https://doi.org/10.1117/12.462174

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