Lucky imaging: improved localization accuracy for single molecule imaging.

Area of Science:

• Optics and Photonics
• Biophysics
• Microscopy

Background:

• Single-molecule fluorescence microscopy (SMFM) is crucial for observing biological processes at the molecular level.
• Achieving high resolution in SMFM is essential for detailed analysis but often limited by optical diffraction and sample dynamics.
• Existing super-resolution techniques can be complex or require specific labeling strategies.

Purpose of the Study:

• To adapt the astronomical Lucky imaging technique for application in single-molecule fluorescence microscopy.
• To quantitatively assess the improvement in imaging resolution achieved by this novel method.
• To demonstrate the versatility of the technique across different types of fluorescent samples.

Main Methods:

• The study applied the Lucky imaging technique, traditionally used in astronomy, to SMFM data.
• This involved selectively analyzing and combining high-quality frames from single-molecule trajectories.
• The method was tested on various samples, including fluorescent dye molecules, quantum dots, and in vivo biological systems.

Main Results:

• A significant improvement in imaging resolution was achieved, with factors of 1.6 for individual fluorophores.
• Resolution enhancement reached up to 5.6 for more complex images and biological samples.
• The technique proved effective for both standard fluorescent nanoparticles and in vivo imaging of cellular processes.

Conclusions:

• Lucky imaging offers a powerful and accessible method to enhance resolution in single-molecule fluorescence microscopy.
• The technique provides a substantial boost in image clarity, enabling more detailed visualization of molecular events.
• This approach has broad applicability in biophysics and cell biology research for improved microscopic analysis.