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    We developed a new space-time Fourier ptychography (ST-FP) system for high-speed live imaging of microorganisms. This advanced system overcomes motion blur and improves temporal resolution for dynamic biological studies.

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    Area of Science:

    • Microscopy and Imaging Science
    • Biophysics
    • Computational Imaging

    Background:

    • High-fidelity live imaging is crucial for understanding dynamic biological processes.
    • Existing methods struggle with motion blur and low temporal resolution, limiting studies of fast-evolving specimens.

    Purpose of the Study:

    • To develop and validate an optimized space-time Fourier ptychography (ST-FP) system for high-throughput, time-resolved quantitative phase imaging.
    • To overcome limitations in photon budget, timing, and computational speed for imaging dynamic biological samples.

    Main Methods:

    • Developed a custom shift-register LED panel for flicker-free illumination, increasing effective irradiance by ~1100x.
    • Implemented an auto-differentiable, GPU-accelerated complex-valued reconstruction framework with temporal regularization.
    • Achieved a ~23x speedup in computational reconstruction time (CPU vs. GPU).

    Main Results:

    • Demonstrated stable imaging with exposure times as short as 800 μs.
    • Achieved a ~45x improvement in space-bandwidth-time product (SBP-T) compared to previous ST-FP implementations.
    • Successfully imaged live vinegar eels and brine shrimp at up to 260 Hz with uncontrolled motion.

    Conclusions:

    • The optimized ST-FP system significantly enhances the dynamic range and temporal resolution for live biological imaging.
    • Motion-aware reconstruction enables detailed trajectory tracking and flow field analysis of dynamic biological behaviors.
    • This technology pushes the boundaries of high-throughput Fourier ptychography for studying fast biological processes.