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Ultrasound Autofocusing: Common Midpoint Phase Error Optimization via Differentiable Beamforming.

Walter Simson, Louise Zhuang, Benjamin N Frey

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    This summary is machine-generated.

    This study introduces a new autofocusing method for ultrasound imaging to correct phase aberrations. The technique optimizes common midpoint phase error (CMPE) for improved image quality and velocity field estimation.

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    Area of Science:

    • Medical Imaging
    • Acoustics
    • Wave Propagation

    Background:

    • Heterogeneous media in ultrasound imaging cause phase aberrations, degrading image resolution and contrast.
    • Adaptive imaging techniques aim to correct these aberrations for better focusing.

    Purpose of the Study:

    • To propose a novel autofocusing paradigm for aberration correction in ultrasound imaging.
    • To utilize common midpoint phase error (CMPE) for robust aberration measurement and acoustic autofocusing.

    Main Methods:

    • Fitting an acoustic velocity field to pressure measurements via CMPE optimization.
    • Employing a straight-ray wave propagation model for beamforming in diffusely scattering media.
    • Iterative optimization using a differentiable beamforming approach for simultaneous focus improvement and velocity field estimation.

    Main Results:

    • Common midpoint phase error (CMPE) is a robust measure of phase aberration for acoustic autofocusing.
    • The method successfully estimates the acoustic velocity field of the interrogated medium.
    • Demonstrated performance in silico, in vitro, and in vivo models.

    Conclusions:

    • The proposed method offers practical applications in distributed aberration quantification, correction, and velocity estimation for medical ultrasound autofocusing.
    • This approach enables improved image focus and accurate velocity field mapping without explicit numerical time-stepping models.