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Ultra-high spatio-temporal resolution imaging with parallel acquisition-readout structured illumination microscopy

Xinzhu Xu1,2,3,4, Wenyi Wang1,3,5, Liang Qiao4,5

  • 1Department of Biomedical Engineering, College of Future Technology, Peking University, Beijing, 100871, China.

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|May 28, 2024
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Parallel acquisition-readout SIM (PAR-SIM) enhances imaging speed at the hardware level, achieving 132.9 MPixels·s-1. This super-resolution technique captures cellular dynamics like mitochondrial fusion at 408 Hz without increased camera costs.

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Area of Science:

  • Biophysics
  • Optical Microscopy
  • Cell Biology

Background:

  • Structured illumination microscopy (SIM) is a super-resolution technique for biological imaging.
  • Current methods to increase SIM frame rates rely on complex algorithms or expensive cameras.
  • Phototoxicity remains a challenge in real-time biological specimen imaging.

Purpose of the Study:

  • To introduce a hardware-level approach to increase SIM frame rates and region of interest (ROI) coverage.
  • To achieve higher imaging speeds without additional camera costs or intricate algorithms.
  • To demonstrate the capability of the new method for live-cell imaging.

Main Methods:

  • Developed parallel acquisition-readout SIM (PAR-SIM) by synchronizing pattern generation with image exposure-readout.
  • Utilized the full frame-width of the detector for enhanced spatial-temporal flux.
  • Achieved a spatial-temporal flux of 132.9 MPixels·s-1 with 100 nm resolution.

Main Results:

  • PAR-SIM achieved a 9.6-fold increase in spatial-temporal flux compared to existing techniques.
  • Successfully reconstructed cellular organelles under low signal conditions with ultra-short exposure times.
  • Captured mitochondrial dynamics and membrane fusion in live COS-7 cells at 408 Hz.

Conclusions:

  • PAR-SIM significantly enhances SIM frame rates through a novel parallel exposure-readout mode.
  • This approach offers a cost-effective solution for high-speed super-resolution imaging.
  • The PAR-SIM strategy has potential applications in other advanced imaging systems.