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Fast Plane Wave 2-D Vector Flow Imaging Using Transverse Oscillation and Directional Beamforming.

Jonas Jensen, Carlos Armando Villagomez Hoyos, Matthias Bo Stuart

    IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
    |April 20, 2017
    PubMed
    Summary

    This study introduces a new ultrasound method combining transverse oscillation (TO) and directional beamforming (DB) to improve blood flow velocity estimation. The TO-DB approach enhances accuracy and reduces computational load compared to traditional methods.

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    Area of Science:

    • Medical Imaging
    • Ultrasound Technology
    • Biomedical Engineering

    Background:

    • Estimating 2-D velocity vectors in ultrasound is crucial for diagnosing vascular conditions.
    • Directional beamforming (DB) offers high precision but demands significant computational resources.
    • Transverse oscillation (TO) is less computationally intensive but provides lower accuracy in velocity estimation.

    Purpose of the Study:

    • To develop and evaluate a hybrid ultrasound method (TO-DB) for improved blood flow velocity estimation.
    • To assess the trade-offs between accuracy, precision, and computational load compared to existing techniques.
    • To validate the TO-DB method in simulations and in vivo measurements of carotid artery blood flow.

    Main Methods:

    • A novel approach combining TO for initial angle estimation and DB for refinement was proposed.

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  • Steered plane wave transmissions were used for high frame rate imaging.
  • Simulations of parabolic flow and realistic carotid bifurcation models were performed, alongside in vivo carotid artery scanning.

    • Main Results:

    • The TO-DB method significantly improved angle estimation accuracy (SD < 2°) and velocity magnitude precision (SD < 2%) compared to TO alone.
    • Computational load for TO-DB was 4.6 times higher than TO but 7 times lower than conventional DB.
    • Simulations showed reduced velocity spread (7.1 cm/s for TO-DB vs. 11.8 cm/s for TO) in complex flow.
    • In vivo studies demonstrated a lower standard deviation in velocity profiles over a cardiac cycle for TO-DB (3.2%) compared to TO (4.2%).

    Conclusions:

    • The proposed TO-DB method offers a superior balance of accuracy and computational efficiency for ultrasound-based blood flow velocity estimation.
    • This hybrid approach enhances precision in angle and velocity magnitude, particularly in complex flow scenarios.
    • The TO-DB technique shows promise for improved clinical applications in vascular ultrasound imaging.