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Quantifying and optimizing single-molecule switching nanoscopy at high speeds.

Yu Lin1, Jane J Long2, Fang Huang3

  • 1Department of Cell Biology, Yale University School of Medicine, New Haven, Connecticut, United States of America; Department of Biomedical Engineering, Yale University, New Haven, Connecticut, United States of America; Integrated Graduate Program in Physical and Engineering Biology, Yale University, New Haven, Connecticut, United States of America.

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Summary
This summary is machine-generated.

High-speed single-molecule switching nanoscopy achieves excellent image quality comparable to conventional methods. Optimized parameters allow for faster super-resolution imaging without sacrificing resolution or localization precision.

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Area of Science:

  • Super-resolution microscopy
  • Biophysics
  • Optical imaging

Background:

  • Single-molecule switching nanoscopy (SMSN) enables super-resolution imaging by localizing individual fluorescent molecules.
  • Recent advancements have increased SMSN's speed and temporal resolution.
  • The impact of increased speed on image quality remains unquantified.

Purpose of the Study:

  • To quantitatively assess image quality in SMSN at varying laser intensities and camera speeds.
  • To determine if accelerated data acquisition compromises spatial and temporal resolution.
  • To provide guidelines for optimizing SMSN parameters for high-speed imaging.

Main Methods:

  • Quantitative comparison of image quality using localization precision, molecule density, and Fourier Ring Correlation (FRC) resolution.
  • Systematic variation of laser intensity and camera speed during Alexa Fluor 647-labeled microtubule imaging.
  • Measurement of Alexa Fluor 647 photoswitching kinetics and development of simulation algorithms.

Main Results:

  • Optimized high-speed SMSN achieved comparable image quality to conventional speeds, but 5-25 times faster.
  • Laser intensity and camera speed critically influence active fluorophore density and achievable resolution.
  • Photoswitching kinetics data informed simulation of SMSN image acquisition.

Conclusions:

  • High-speed SMSN can maintain image quality with optimized parameters.
  • Guidelines for laser intensity selection based on imaging speed are provided.
  • The study offers a protocol for evaluating other probes and imaging conditions.