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Resolution improvement in STED super-resolution microscopy at low power using a phasor plot approach.

Luwei Wang1, Bingling Chen, Wei Yan

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This study introduces a new method combining phasor plot analysis and fluorescence lifetime imaging microscopy (FLIM) to enhance Stimulated Emission Depletion (STED) microscopy resolution. The technique improves imaging quality at lower laser power, reducing phototoxicity for biological specimens.

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Area of Science:

  • Super-resolution microscopy
  • Biophotonics
  • Cell biology

Background:

  • Stimulated Emission Depletion (STED) microscopy offers super-resolution imaging but requires high laser power, causing phototoxicity and photobleaching in live specimens.
  • Improving STED resolution at lower depletion power is crucial for live biological imaging.

Purpose of the Study:

  • To develop a method for enhancing STED microscopy resolution using lower depletion laser power.
  • To reduce phototoxicity and photobleaching in biological samples during super-resolution imaging.

Main Methods:

  • Utilized a phasor plot approach combined with fluorescence lifetime imaging microscopy (FLIM).
  • Converted time-resolved STED-FLIM data to the frequency domain using phasor analysis.
  • Extracted relevant data based on phase and amplitude information for resolution enhancement.

Main Results:

  • Demonstrated improved resolution in imaging 100 nm fluorescent microspheres at varying depletion powers using phasor plots.
  • Achieved an 86 nm higher resolution compared to traditional STED imaging for human Nup153 in fixed HeLa cells.
  • Successfully applied the method at a low depletion power of 20 mW.

Conclusions:

  • The combined phasor plot and STED-FLIM approach effectively enhances super-resolution imaging.
  • This method offers a viable solution for high-resolution imaging with reduced phototoxicity.
  • The technique shows promise for advanced biological imaging applications.