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An Experimental Protocol for Assessing the Performance of New Ultrasound Probes Based on CMUT Technology in Application to Brain Imaging
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Transparent Dual-Frequency CMUT Arrays for Photoacoustic Imaging.

Mahyar Ghavami, Mohammad Rahim Sobhani, Roger Zemp

    IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
    |November 8, 2023
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a transparent dual-frequency capacitive micromachined ultrasound transducer (CMUT) array for improved photoacoustic imaging. The novel transparent CMUT design enhances target illumination and imaging depth, overcoming limitations of conventional opaque transducers.

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    Area of Science:

    • Biomedical Engineering
    • Optical Imaging
    • Materials Science

    Background:

    • Conventional photoacoustic imaging systems use opaque ultrasound transducers, requiring inefficient oblique light delivery.
    • This leads to suboptimal target illumination and bulky system designs, limiting imaging performance.

    Purpose of the Study:

    • To develop a transparent capacitive micromachined ultrasound transducer (CMUT) linear array for through-illumination photoacoustic imaging.
    • To achieve dual-band operation for enhanced spatial resolution and imaging depth.

    Main Methods:

    • Fabrication of a transparent CMUT array using adhesive wafer bonding.
    • Utilized optically transparent conductors (indium tin oxide), a transparent polymer (bisbenzocyclobutene), and silicon nitride membrane.
    • Designed a dual-frequency array (4.2 and 9.3 MHz) in an interlaced architecture.

    Main Results:

    • Achieved maximum optical transparency of 76.8% in the visible range.
    • The transparent dual-frequency CMUT array demonstrated improved spatial resolution and imaging depth in through-illumination photoacoustic imaging of wire targets.
    • Minimized grating lobes in the receive point spread function (PSF) through interlaced architecture.

    Conclusions:

    • The transparent dual-frequency CMUT array is a promising advancement for through-illumination photoacoustic imaging.
    • This technology overcomes the limitations of opaque transducers, enabling more efficient and effective optical imaging.
    • The dual-frequency design contributes to superior spatial resolution and imaging depth.