Efficient focusing scheme for transverse velocity estimation using cross-correlation

Joergen Arendt Jensen

doi:10.1117/12.428200

30 May 2001 Efficient focusing scheme for transverse velocity estimation using cross-correlation

Joergen Arendt Jensen

Author Affiliations +

Proceedings Volume 4325, Medical Imaging 2001: Ultrasonic Imaging and Signal Processing; (2001) https://doi.org/10.1117/12.428200
Event: Medical Imaging 2001, 2001, San Diego, CA, United States

Abstract

The blood velocity can be estimated by cross-correlation of received RF signals, but only the velocity component along the beam direction is found. A previous paper showed that the complete velocity vector can be estimated, if received signals are focused along lines parallel to the direction of the flow. Here a weakly focused transmit field was used along with a simple delay-sum beamformer. A modified method for performing the focusing by employing a special calculation of the delays is introduced, so that a focused emission can be used. The velocity estimation was studied through extensive simulations with Field II. A 64-elements, 5 MHz linear array was used. A parabolic velocity profile with a peak velocity of 0.5 m/s was considered for different angles between the flow and the ultrasound beam and for different emit foci. At 60 degrees the relative standard deviation was 0.58% for a transmit focus at 40 mm. For 90 degrees the new approach gave a relative standard deviation of 8.3% with a focus at 40 mm and 8.0% at a transmit focus of 150 mm. Pulsatile flow in the femoral artery was also simulated. A purely transverse flow profile could be obtained with a relative standard deviation of less than 10% over the whole cardiac cycle, which is sufficient to show clinically relevant transverse color flow images.

Citation Download Citation

Joergen Arendt Jensen "Efficient focusing scheme for transverse velocity estimation using cross-correlation", Proc. SPIE 4325, Medical Imaging 2001: Ultrasonic Imaging and Signal Processing, (30 May 2001); https://doi.org/10.1117/12.428200

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