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Related Experiment Video

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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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A Spatial Coherence Beamformer Design for Power Doppler Imaging.

Kathryn Ozgun, Jaime Tierney, Brett Byram

    IEEE Transactions on Medical Imaging
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    PubMed
    Summary

    This study introduces a new ultrasound beamformer using mutual intensity to improve blood flow imaging. It enhances clutter suppression and preserves blood signal energy for better visualization of flow volume.

    Area of Science:

    • Ultrasound Imaging
    • Medical Physics
    • Biomedical Engineering

    Background:

    • Acoustic clutter significantly degrades ultrasound images, particularly in flow imaging.
    • Conventional power Doppler struggles with low signal-to-noise ratios (SNR) due to strong clutter signals.
    • Existing coherence-based methods like Coherent Flow Power Doppler (CFPD) reduce clutter but distort blood signal energy.

    Purpose of the Study:

    • To develop a novel coherence beamformer that preserves blood signal energy while suppressing clutter.
    • To enable robust quantification of fractional moving blood volume in cluttered ultrasound environments.
    • To improve the depiction of flow volume gradation in challenging imaging conditions.

    Main Methods:

    • Proposed a coherence beamformer utilizing mutual intensity instead of normalized coherence.

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  • Validated the approach using Field II simulations, phantom studies, and in vivo human liver data.
  • Derived an adaptive statistical threshold for residual noise suppression.

    • Main Results:

    • The mutual intensity approach successfully retained clutter suppression capabilities.
    • Preservation of underlying blood signal energy was demonstrated.
    • Feasibility was confirmed across simulations, phantoms, and in vivo data.

    Conclusions:

    • The proposed beamformer offers an alternative to CFPD for flow imaging in cluttered environments.
    • It enables accurate depiction of flow volume gradation by preserving signal energy.
    • This technique shows promise for enhanced diagnostic capabilities in ultrasound flow imaging.