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Single-photon counting multicolor multiphoton fluorescence microscope.

Christof Buehler1, Ki H Kim, Urs Greuter

  • 1Paul Scherrer Institut, CH-5232 Villigen, Switzerland.

Journal of Fluorescence
|February 16, 2005
PubMed
Summary
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We developed a multicolor multiphoton fluorescence microscope with single-photon counting sensitivity. This advanced imaging system offers highly sensitive, real-time, spectrally-resolved 3D imaging for biomedical research.

Area of Science:

  • Biomedical Optics
  • Microscopy Technology
  • Photon Counting

Background:

  • Multiphoton fluorescence microscopy is a powerful tool for biological imaging.
  • Limitations exist in sensitivity and spectral resolution for advanced applications.

Purpose of the Study:

  • To develop a novel multicolor multiphoton fluorescence microscope.
  • To achieve single-photon counting sensitivity and enhanced spectral resolution.

Main Methods:

  • Integration of a multiphoton microscope with a UV-Vis spectrograph and a 16-anode photomultiplier tube (PMT).
  • Development of a multichannel photon counting card (mC-PhCC) for direct signal acquisition from multi-anode PMTs.
  • Implementation of a high-throughput, parallel, single-photon counting scheme with a high-speed data interface.

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Main Results:

  • The mC-PhCC demonstrated no electronic crosstalk and linear signal collection up to 10(8) counts per second.
  • Real-time data readout achieved 30 frames per second for 2 MByte lambda-stacks (16 spectral channels, 256x256 pixels, 12-bit dynamic range).
  • System performance validated with spectrally resolved imaging of fluorescent latex spheres and ex-vivo human skin.

Conclusions:

  • The developed multicolor multiphoton microscope offers high sensitivity and real-time spectral imaging capabilities.
  • The modular design of the mC-PhCC allows for scalability to PMTs with more anodes (e.g., 64-anode PMT).
  • This technology is well-suited for advanced 3D biomedical imaging applications requiring spectral information.