Patent
Angle-independent continuous wave doppler device
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TLDR
In this article, an apparatus for determining the velocity of a fluid flowing through a lumen comprises a first diffraction grating transducer (DGT) responsive to a continuous wave (CW) input and operable in a first mode for producing a first signal beam at a first frequency and first phase, and in a second mode for operating as a receiver and coupled to the first DGT at a predetermined angle.Abstract:
An apparatus (10) for determining the velocity of a fluid flowing through a lumen comprises a first diffraction grating transducer (DGT) (1) responsive to a continuous wave (CW) input and operable in a first mode for producing a first signal beam at a first frequency and first phase, and in a second mode for producing a second signal beam at the first frequency and a first phase; and in a second mode for oproducing a second signal beam at a first frequency and a second phase; a second diffraction grating transducer (DGT) (2) operating as a receiver and coupled to the first diffraction grating transducer at a predetermined angle, the second diffraction grating transducer producing a first beam which intersects the first DGT first beam for receiving a first reflected signal associated with the first signal beam, and for producing a second beam which intersects the first DGT second beam for receiving a second reflected signal associated with the second signal beam.read more
Citations
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References
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PatentDOI
Diffracting doppler-transducer
TL;DR: In this paper, the velocity and flow volume of a fluid flowing through a lumen were determined from at least two equations in the two unknowns of the velocity, and the angle between the ultrasonic transducer and the direction of the fluid flow, and from a determination of the diameter of the lumen.
Patent
Angle independent doppler in ultrasound imaging
TL;DR: In this article, the authors proposed a method for providing a blood flow velocity display of blood flow in a blood vessel in an ultrasound imaging system by converting spectral Doppler mode data using estimates of the blood flow angle and blood flow velocities.
Patent
Higher-order quadrature driven diffraction grating doppler transducers
TL;DR: In this paper, a higher-order quadrature driven diffraction grating ultrasonic transducer is proposed for determining the velocity of a fluid under investigation, which can be used to determine the relative velocity of the fluid in a fluid.
Patent
User control for steerable CW doppler
TL;DR: In this article, a method and apparatus of operating an ultrasound imaging apparatus so as to obtain continuous wave (CW) Doppler data from a user selected area comprises operating a multiple element transducer array and its associated delay and signal processing circuitry.
PatentDOI
Doppler ultrasound velocity estimation
Jin Kim,Dong-Chyuan Liu +1 more
TL;DR: In this paper, a spatial-temporal doppler velocity estimation method is proposed to expand the detectable frequency range by extending the frequency boundary at which aliasing artifacts may occur.