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Fluorescence Lifetime Macro Imager for Biomedical Applications
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Modulated CMOS camera for fluorescence lifetime microscopy.

Hongtao Chen1, Gerhard Holst2, Enrico Gratton1

  • 1Laboratory for Fluorescence Dynamics, Department of Biomedical Engineering University of California, Irvine, California.

Microscopy Research and Technique
|October 27, 2015
PubMed
Summary
This summary is machine-generated.

This study calibrates a new CMOS camera for widefield frequency-domain fluorescence lifetime imaging microscopy (FD-FLIM). Post-acquisition corrections enhance accuracy, making FD-FLIM more accessible for biomedical research.

Keywords:
CMOSFLIMPCO FLIM camerafluorescence lifetimefrequency-domainharmonic frequencyphasor plotwide-field

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Area of Science:

  • Microscopy
  • Biophysics
  • Instrumentation

Background:

  • Widefield frequency-domain fluorescence lifetime imaging microscopy (FD-FLIM) offers fast and accurate fluorescence lifetime measurements.
  • High costs and complexity of traditional FD-FLIM systems limit widespread adoption.
  • The PCO QMFLIM2 camera, based on a high-frequency modulated CMOS sensor, presents a more accessible solution.

Purpose of the Study:

  • To test and provide calibration procedures for the PCO QMFLIM2 camera.
  • To improve the accuracy of FD-FLIM measurements using post-acquisition corrections.
  • To assess the camera's suitability for large-frame, high-speed biomedical imaging.

Main Methods:

  • Pixel-level calibration of the camera's nonuniform system response.
  • Intensity-dependent calibration to account for modulation signal variations.
  • Utilized modulated laser diodes and a 20 MHz pulsed white supercontinuum laser.
  • Analysis of camera output using SimFCS software and the phasor approach.

Main Results:

  • Developed essential pixel-level and intensity-dependent calibration procedures.
  • Demonstrated the necessity of these corrections for accurate measurements, including higher harmonics.
  • Confirmed the camera's capability to work with various light sources and analysis methods.

Conclusions:

  • The PCO QMFLIM2 camera, with appropriate calibration, provides accurate FD-FLIM data.
  • Post-acquisition corrections significantly enhance measurement reliability.
  • This technology democratizes FD-FLIM for diverse biomedical applications demanding high-speed, widefield imaging.