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    This study introduces a new ultrasound method for precise axial scatterer localization, achieving micrometre accuracy. This technique enhances super-resolution imaging by overcoming pulse length limitations.

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    Area of Science:

    • Medical Imaging
    • Biomedical Engineering
    • Acoustics

    Background:

    • Conventional ultrasound imaging is limited by pulse length dependence for axial scatterer localization.
    • Achieving higher resolution in ultrasound is crucial for improved diagnostic capabilities.

    Purpose of the Study:

    • To develop a novel method for micrometre axial scatterer localization in medical ultrasound.
    • To overcome the limitations of pulse length dependence in current ultrasound imaging.

    Main Methods:

    • The method adapts cellular microscopy techniques using multi-focal imaging and an image sharpness metric.
    • Point scatterer localization involves generating overlapping sharpness curves from three foci during receive processing.
    • A maximum likelihood algorithm with a calibration standard combines data from these curves to identify scatterer position.

    Main Results:

    • Simulated and experimental data demonstrate axial localization accuracy down to 10.21 micrometres.
    • The sharpness method achieved up to 11.4 times increased precision compared to conventional localization techniques.
    • Improvement is influenced by the rate of sharpness change per focus and signal-to-noise ratio.

    Conclusions:

    • Super-resolution axial imaging principles from optical microscopy have been successfully translated to ultrasound.
    • The normalized sharpness method shows potential for scatterer localization and advancing super-resolution ultrasound imaging.