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Fluorescence Lifetime Imaging of Molecular Rotors in Living Cells
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Published on: February 9, 2012

Photon budget analysis for fluorescence lifetime imaging microscopy.

Qiaole Zhao1, Ian T Young, Jan Geert Sander de Jong

  • 1Delft University of Technology, Department of Imaging Science and Technology, The Netherlands.

Journal of Biomedical Optics
|September 8, 2011
PubMed
Summary
This summary is machine-generated.

We developed a photon budget model for fluorescence microscopy, crucial for optimizing imaging systems. This model helps understand photon limitations in frequency-domain fluorescence lifetime imaging microscopy (FLIM) and widefield fluorescence microscopy.

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Area of Science:

  • Biophysics
  • Optical Microscopy
  • Spectroscopy

Background:

  • Photon efficiency is a critical factor in fluorescence microscopy.
  • Frequency-domain fluorescence lifetime imaging microscopy (FLIM) faces significant photon limitations.
  • Understanding these limitations is key for optimizing imaging system performance.

Purpose of the Study:

  • To construct a mathematical model analyzing photon efficiency in FLIM.
  • To establish a photon budget considering light source power and detector signal-to-noise ratio.
  • To validate the model's applicability to FLIM and general fluorescence microscopy.

Main Methods:

  • Developed a mathematical model for photon efficiency in FLIM.
  • Defined a photon budget based on illumination power and detector SNR.
  • Modeled typical experimental configurations with various fluorophores (Fura-2 to Cy5).

Main Results:

  • The photon budget quantifies limitations in FLIM and widefield fluorescence microscopy.
  • Experimental validation confirmed the model's accuracy regarding fluorophore concentration and Poisson distribution.
  • The model accurately predicts fluorescence emission intensity and photon distribution.

Conclusions:

  • The photon budget is essential for characterizing constraints in current fluorescence microscopes.
  • This model aids in the design and fabrication of improved fluorescence imaging systems.
  • The findings are broadly applicable to both FLIM and widefield fluorescence microscopy intensity measurements.