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Passive Acoustic Mapping Using Data-Adaptive Beamforming Based on Higher Order Statistics.

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    A new method, robust beamforming by linear programming (RLPB), enhances passive acoustic mapping (PAM) for therapeutic ultrasound. RLPB improves cavitation imaging resolution and reduces reliance on precise calibration, aiding clinical applications.

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    Area of Science:

    • Acoustics
    • Biomedical Engineering
    • Medical Imaging

    Background:

    • Nonlinear acoustic emissions, especially from cavitation, are crucial for therapeutic ultrasound safety and efficacy.
    • Passive acoustic mapping (PAM) images cavitation in real-time but faces spatial resolution limits.
    • Existing methods like robust capon beamformer (RCB) assume Gaussian signal distribution, limiting performance.

    Purpose of the Study:

    • To introduce a novel beamforming approach, robust beamforming by linear programming (RLPB), to enhance PAM's source resolvability.
    • To overcome the Gaussian distribution assumption limitation of current PAM beamformers.
    • To improve the spatial resolution and calibration robustness of cavitation imaging in therapeutic ultrasound.

    Main Methods:

    • Developed RLPB, an optimization-based beamforming method utilizing higher-order statistics.
    • RLPB makes no prior assumptions on the statistical distribution of acoustic signals.
    • Evaluated RLPB through numerical simulations and in vitro experiments.

    Main Results:

    • Numerical simulations showed RLPB improves resolvability over time-exposure acoustics and RCB.
    • In vitro experiments demonstrated a 22% axial and 13% transverse resolution improvement over RCB.
    • RLPB effectively accounts for array calibration errors, showing decreased dependence on accurate calibration.

    Conclusions:

    • RLPB significantly enhances spatial resolution and robustness in passive acoustic mapping.
    • The method's reduced dependence on calibration facilitates clinical translation of PAM.
    • Improved PAM is expected to advance diagnostic and therapeutic ultrasound applications, including super-resolution imaging.