High-fidelity microsecond-scale cellular imaging using two-axis compressed streak imaging fluorescence microscopy

Area of Science:

• Computational imaging
• Optical microscopy
• Biophysics

Background:

• Compressed streak imaging (CSI) achieves ultra-high frame rates but struggles with subtle intensity fluctuations in slow-moving objects.
• High streak compression and motion blur limit CSI's application in cellular fluorescence microscopy.
• Existing CSI technologies face challenges in accurately capturing dynamic biological events.

Purpose of the Study:

• To develop an advanced CSI method, two-axis compressed streak imaging (TACSI), for improved video fidelity.
• To overcome the limitations of conventional CSI in detecting subtle intensity variations and motion blur.
• To expand the utility of CSI for high-speed biological imaging.

Main Methods:

• Introduced a second scanning axis in CSI to create a two-axis compressed streak imaging (TACSI) system.
• TACSI shuttles a conjugate image of the object relative to the coded aperture.
• Developed an analytical model for TACSI compression ratio, validated with simulations and empirical data.

Main Results:

• TACSI significantly improves reconstructed video fidelity compared to conventional CSI.
• The method reduces streak compression ratio and mitigates coded aperture motion blur.
• Demonstrated TACSI's capability to measure rapid cell membrane potential variations.

Conclusions:

• TACSI overcomes key limitations of current CSI technologies, enhancing its applicability in microscopy.
• The developed method enables high-speed visualization of cellular dynamics on microsecond timescales.
• TACSI has broad implications for studying fast biological phenomena like action potentials and enzymatic reactions.