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Fluorescent Microspheres as Point Sources: A Localization Study.

Jerry Chao1, Taiyoon Lee2, E Sally Ward3

  • 1Department of Biomedical Engineering, Texas A&M University, College Station, Texas, United States of America; Department of Molecular and Cellular Medicine, Texas A&M Health Science Center, College Station, Texas, United States of America.

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Summary
This summary is machine-generated.

This study introduces an improved method for localizing fluorescent microspheres in microscopy by fitting an Airy pattern. This technique enhances accuracy for drift correction and image registration, particularly for smaller microspheres.

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Area of Science:

  • Optical microscopy
  • Nanoparticle imaging
  • Image analysis

Background:

  • Microsphere localization is crucial for single molecule microscopy.
  • Current methods using point spread function fitting have limitations.
  • Airy pattern fitting offers a potential improvement.

Purpose of the Study:

  • To evaluate the suitability of Airy pattern fitting for microsphere localization.
  • To assess the accuracy of this method against the Cramér-Rao lower bound.
  • To determine optimal conditions for localizing microspheres of various sizes.

Main Methods:

  • Simulated and experimental microsphere image data were used.
  • A maximum likelihood estimator fitting an Airy pattern was employed.
  • Localization accuracy was assessed using standard errors and variance.

Main Results:

  • Airy pattern fitting is a suitable method for microsphere localization.
  • Microspheres up to 100 nm can be localized with a fixed-width Airy pattern.
  • Microspheres up to 1 μm can be localized with a floated-width Airy pattern.

Conclusions:

  • Airy pattern fitting provides accurate microsphere localization in microscopy.
  • The method's performance is dependent on microsphere size and pattern fitting parameters.
  • This approach improves accuracy for drift correction and image registration.