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Compressive sensing for fast 3-D and random-access two-photon microscopy.

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    This study introduces a faster 3-D imaging method using multi-focus compressive sensing (CS) with a digital micromirror device (DMD) for two-photon excitation (TPE) microscopy. The novel approach enhances imaging speed significantly without compromising resolution, enabling advanced biological studies.

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    Area of Science:

    • Biophotonics
    • Microscopy
    • Optical Imaging

    Background:

    • 3-D two-photon excitation (TPE) microscopy is vital for biological research.
    • Current TPE microscopy speed is limited by point-scanning acquisition using photomultiplier tubes (PMTs).

    Purpose of the Study:

    • To develop a faster 3-D imaging method for TPE microscopy.
    • To enable random-access imaging of selected regions in 3-D specimens.

    Main Methods:

    • Implemented a multi-focus compressive sensing (CS) technique combined with a digital micromirror device (DMD).
    • Utilized holography-based DMD for random-access scanning and generated 1-20 random laser foci.
    • Reconstructed 3-D images from combined intensity signals recorded by a PMT using CS algorithms.

    Main Results:

    • Achieved a 3-5x enhancement in imaging speed for 3-D TPE microscopy.
    • Demonstrated high-resolution imaging with a 25% sampling ratio and five foci.
    • Verified the method's principle and optimal parameters through simulations and experiments on various samples.

    Conclusions:

    • The CS-based multi-focus TPE microscopy offers a significant speed improvement for 3-D imaging.
    • This technique allows high-resolution, random-access imaging, crucial for dynamic biological processes.
    • Potential applications include neuronal imaging and optogenetics research.