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High-speed time-resolved laser-scanning microscopy using the line-to-pixel referencing method.

Jiheun Ryu, Jayul Kim, Hyunjun Kim

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    This summary is machine-generated.

    This study introduces a faster fluorescence lifetime imaging microscopy (FLIM) method using line-to-pixel referencing with analog mean-delay (AMD) for real-time, high-precision biological imaging.

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    Area of Science:

    • Biophotonics
    • Microscopy
    • Spectroscopy

    Background:

    • Fluorescence lifetime imaging microscopy (FLIM) visualizes biological targets but faces real-time, high-precision imaging limitations.
    • Conventional FLIM methods struggle with photon accumulation speed and digitizer rearm times.

    Purpose of the Study:

    • To develop a high-speed time-resolved laser-scanning microscopy technique.
    • To overcome limitations of conventional FLIM for real-time, high-precision imaging.

    Main Methods:

    • Incorporated a novel line-to-pixel referencing method into the analog mean-delay (AMD) method.
    • Utilized a line trigger phase-locked with the first pulse of each image line to bypass digitizer rearm time limitations.
    • Tested with a 40 MHz pulsed laser and a 500 ns digitizer rearm time.

    Main Results:

    • Achieved a frame rate of 3.73 fps and a pixel rate of 3.91 MHz.
    • Maintained measurement precision under 20 ps.
    • Demonstrated significantly enhanced photon accumulation speed compared to time-correlated single-photon counting (TCSPC).

    Conclusions:

    • The proposed line-to-pixel referencing method enhances AMD-FLIM speed and efficiency.
    • Enables real-time, high-precision imaging for biological applications.
    • Overcomes critical limitations of existing FLIM techniques.