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Live Cell Imaging of F-actin Dynamics via Fluorescent Speckle Microscopy (FSM)
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Dynamic speckle illumination microscopy with translated versus randomized speckle patterns.

Cathie Ventalon1, Jerome Mertz

  • 1Boston University, Department of Biomedical Engineering, 44 Cummington St., Boston, MA 02215, USA. ventalon@bu.edu

Optics Express
|June 17, 2009
PubMed
Summary

Dynamic speckle illumination microscopy enhances depth discrimination by analyzing image intensity variance. Translated speckle patterns offer superior sectioning strength over randomized patterns due to improved background rejection.

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Area of Science:

  • Microscopy
  • Optical Imaging
  • Biophysics

Background:

  • Dynamic speckle illumination (DSI) microscopy is a widefield fluorescence imaging technique.
  • DSI provides depth discrimination by illuminating samples with dynamic speckle patterns.
  • Image processing algorithms analyze intensity variance between consecutive images.

Purpose of the Study:

  • To investigate the relationship between speckle pattern dynamics and DSI sectioning strength.
  • To compare the effectiveness of translated versus randomized speckle patterns.
  • To develop a theoretical framework for DSI sectioning.

Main Methods:

  • Utilized a differential intensity variance algorithm.
  • Employed translated and randomized speckle patterns for illumination.
  • Developed and experimentally validated a theory for arbitrary point-spread-functions.

Main Results:

  • DSI sectioning strength is dependent on speckle pattern dynamics.
  • Translated speckle patterns provide greater sectioning strength than randomized patterns.
  • Out-of-focus correlations in translated patterns improve background rejection.

Conclusions:

  • Speckle pattern dynamics critically influence DSI performance.
  • Translated speckle patterns offer an advantage for depth discrimination in DSI microscopy.
  • The developed theory accurately predicts DSI sectioning capabilities.