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Related Experiment Video

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Blood Flow Imaging with Ultrafast Doppler
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Diverging Wave Volumetric Imaging Using Subaperture Beamforming.

Pedro Santos, Geir Ultveit Haugen, Lasse Lovstakken

    IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
    |October 15, 2016
    PubMed
    Summary
    This summary is machine-generated.

    High frame rate 3-D tissue Doppler imaging (TDI) is feasible on clinical ultrasound systems. This study demonstrates that optimized diverging wave sequences overcome subaperture beamforming limitations for enhanced cardiac imaging.

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    Area of Science:

    • Medical imaging
    • Ultrasound technology
    • Cardiovascular imaging

    Background:

    • Clinical applications require high frame rate 3-D imaging, specifically 3-D tissue Doppler imaging (TDI).
    • Existing methods often rely on experimental platforms, posing challenges for clinical translation due to hardware constraints like subaperture (SAP) beamforming in 2-D matrix array transducers.

    Purpose of the Study:

    • To assess the feasibility of high frame rate (HFR) 3-D TDI using diverging waves (DWs) on clinical 2-D matrix array transducers with SAP beamforming limitations.
    • To evaluate the trade-off between image quality, frame rate, and clinical applicability.

    Main Methods:

    • Simulations were performed to analyze HFR 3-D TDI with DWs and SAP beamforming.
    • A sparse transmission sequence with nine DWs was optimized for a 70°×70° sector at ~600 Hz volume rates.
    • The optimized sequence was implemented on a clinical system for in vivo TDI acquisition in healthy subjects.

    Main Results:

    • Single DW transmission with SAP beamforming caused artifacts; however, moderate transmission sequences showed a favorable balance.
    • The sparse nine-transmission sequence achieved good imaging performance.
    • In vivo results demonstrated comparable velocity curves between the proposed method and conventional TDI (cross-correlation of 0.90 ± 0.11).

    Conclusions:

    • High frame rate 3-D TDI is achievable on clinical 2-D matrix array ultrasound systems.
    • Optimized diverging wave sequences and sparse transmissions can overcome SAP beamforming limitations.
    • This approach offers a viable method for advanced cardiovascular imaging in clinical settings.