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NIR-II multifocal structured illumination microscopy.

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    Summary
    This summary is machine-generated.

    We developed near-infrared second window multifocal structured illumination microscopy (NIR-II MSIM) for deep tissue imaging. This advanced optical microscopy technique overcomes scattering limitations, enabling high-resolution visualization in turbid biological samples.

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    Area of Science:

    • Biomedical optics
    • Microscopy techniques
    • In vivo imaging

    Background:

    • Optical microscopy is vital for biological research but limited by light scattering in deep, turbid tissues.
    • Penetration depth and spatial resolution are key challenges for current deep-tissue imaging modalities.

    Purpose of the Study:

    • To implement a novel near-infrared second window multifocal structured illumination microscopy (NIR-II MSIM) system.
    • To overcome the limitations of conventional optical microscopy for deep tissue imaging.

    Main Methods:

    • Utilized raster-scanning multifocal illumination patterns for uniform sample illumination.
    • Integrated near-infrared second window (NIR-II) photoemission with multifocal photoexcitation.
    • Employed Intralipid/agar phantoms to simulate turbid biological specimens.

    Main Results:

    • Achieved deep penetration imaging at a depth of 2.5 mm in turbid phantoms.
    • Demonstrated enhanced spatial resolution of approximately 1.49 µm.
    • Obtained high contrast imaging, with superior performance at longer NIR-II wavelengths.

    Conclusions:

    • NIR-II MSIM provides deep penetration, high contrast, and enhanced resolution for turbid specimens.
    • The developed system offers a promising platform for future in vivo physiological studies.
    • Longer wavelengths within the NIR-II spectrum enhance imaging performance.