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Evaluating performance in three-dimensional fluorescence microscopy.

John M Murray1, Paul L Appleton, Jason R Swedlow

  • 1Department of Cell & Developmental Biology, University of Pennsylvania School of Medicine, Philadelphia, PA 19104-6058, USA. murray@cellbio.med.upenn.edu

Journal of Microscopy
|November 30, 2007
PubMed
Summary
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Choosing the best microscopy method for biological samples depends on background noise. This study provides guidelines comparing confocal and wide-field/deconvolution microscopy for optimal image contrast and signal-to-noise ratio.

Area of Science:

  • Biological imaging
  • Microscopy techniques

Background:

  • Biological fluorescence microscopy suffers from degraded image contrast due to high background noise from out-of-focus areas.
  • Techniques like 3-D deconvolution and confocal microscopy reduce background but raise questions about their comparative effectiveness.

Purpose of the Study:

  • To establish guidelines for selecting the most appropriate microscopy method for biological specimens.
  • To compare the performance of different microscopy techniques under controlled conditions.

Main Methods:

  • Comparison of spot scanning confocal, spinning disk confocal, and wide-field/deconvolution (WFD) microscopy.
  • Evaluation of photon collection efficiency, image contrast, and signal-to-noise ratio at equivalent illumination.
  • Use of a specimen with adjustable out-of-focus background levels.

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Main Results:

  • The ratio of out-of-focus background to in-focus signal predicts the most effective microscopy method.
  • Measurement precision for net fluorescence yield was lower than anticipated across all tested modes.
  • Quantitative delineation of appropriate imaging mode usage based on background levels was achieved.

Conclusions:

  • Guidelines are provided for selecting between confocal and wide-field/deconvolution microscopy based on specimen background.
  • An upper limit for the effective range of common imaging modes was defined.