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The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
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Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
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Reverberation Clutter Suppression Using 2-D Spatial Coherence Analysis.

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    This study introduces matrix-LoSCAN, an advanced ultrasound beamforming technique to reduce correlated reverberation clutter in medical imaging. The method significantly improves image contrast and generalized contrast-to-noise ratio for better abdominal structure visualization.

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    Area of Science:

    • Medical imaging
    • Ultrasound beamforming
    • Signal processing

    Background:

    • Diffuse reverberation clutter degrades abdominal ultrasound visibility.
    • Existing Lag-one Spatial Coherence Adaptive Normalization (LoSCAN) suppresses incoherent noise but not correlated reverberation clutter.
    • Reverberation clutter is a 3D phenomenon with potential partial correlation between receive channels.

    Purpose of the Study:

    • To develop and evaluate a 2-D matrix array-based LoSCAN method for suppressing partially correlated reverberation clutter.
    • To enhance ultrasound image quality by improving contrast and signal-to-noise ratio in the presence of complex clutter.

    Main Methods:

    • Implementation of a 2-D matrix array-based LoSCAN (matrix-LoSCAN).
    • Integration of subaperture beamforming (SAB) tuned to noise correlation direction to enhance LoSCAN.
    • Validation using Field II simulations and clinical data from healthy volunteer liver scans with a 64x16 2D array.

    Main Results:

    • The proposed matrix-LoSCAN approach effectively suppresses partially correlated reverberation clutter.
    • Compared to azimuthal LoSCAN, matrix-LoSCAN increased contrast by up to 5.5 dB.
    • The generalized contrast-to-noise ratio (gCNR) was improved by up to 0.07.

    Conclusions:

    • Matrix-LoSCAN with SAB is a robust strategy for mitigating partially correlated reverberation clutter in ultrasound.
    • The developed analytic models provide insight into clutter impact and method efficacy.
    • This technique offers significant potential for enhanced abdominal imaging and diagnostic accuracy.