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Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
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Experimental Implementation of a Pulse Compression Technique Using Coherent Plane-Wave Compounding.

Yanis Mehdi Benane, Denis Bujoreanu, Roberto J Lavarello

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    This study combines resolution enhancement compression (REC) with coherent plane-wave compounding (CPWC) to improve ultrasound imaging. The new CPWC-REC technique enhances axial resolution, signal-to-noise ratio (SNR), and contrast-to-noise ratio (CNR) for faster, clearer images.

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    Area of Science:

    • Medical Imaging
    • Ultrasound Technology
    • Signal Processing

    Background:

    • Ultrasound axial resolution is limited by signal bandwidth and transducer properties.
    • Conventional pulsing (CP) in ultrasound systems has inherent bandwidth limitations.
    • Resolution enhancement compression (REC) is a technique to improve signal energy in transition bands.

    Purpose of the Study:

    • To combine REC with coherent plane-wave compounding (CPWC) for enhanced ultrasound imaging.
    • To improve image quality metrics including axial resolution, SNR, and CNR at ultrafast acquisition rates.

    Main Methods:

    • Developed and applied a combined CPWC and REC technique (CPWC-REC).
    • Utilized a specialized excitation signal to increase signal bandwidth.
    • Evaluated performance using wire and cyst phantoms, and in vivo rabbit imaging.

    Main Results:

    • Achieved a 49% experimental bandwidth improvement and 29% axial resolution enhancement in phantoms.
    • Reported up to 9 dB CNR and 4 dB SNR improvements in cyst phantoms.
    • Demonstrated successful implementation and in vivo feasibility of CPWC-REC.

    Conclusions:

    • CPWC-REC significantly enhances spatial resolution, SNR, and CNR compared to CPWC-CP.
    • The technique enables higher quality ultrasound imaging at ultrafast speeds.
    • REC is effectively implementable with plane-wave imaging for advanced ultrasound applications.