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Related Experiment Videos

Deep tissue two-photon microscopy.

Fritjof Helmchen1, Winfried Denk

  • 1Department of Neurophysiology, Brain Research Institute, University of Zurich, CH-8057 Zurich, Switzerland. helmchen@hifo.unizh.ch

Nature Methods
|November 22, 2005
PubMed
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Nonlinear optical microscopy, like two-photon microscopy, overcomes light scattering in biological tissues. This technique enables high-resolution deep imaging in living animals, advancing cellular visualization.

Area of Science:

  • Biomedical optics
  • Microscopy
  • Cellular imaging

Background:

  • Biological tissues scatter light, limiting traditional microscopy depth.
  • Confocal fluorescence microscopy struggles with deep tissue imaging due to scattering.
  • High-resolution deep imaging is crucial for understanding biological processes in vivo.

Purpose of the Study:

  • To review the fundamental concepts of nonlinear optical microscopy.
  • To discuss the conditions enabling large imaging depths in intact tissues.
  • To highlight the advantages of two-photon microscopy for deep tissue visualization.

Main Methods:

  • Review of nonlinear optical microscopy principles.
  • Discussion of signal generation in scattering media.

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  • Analysis of factors influencing imaging depth.

    • Main Results:

    • Nonlinear microscopy, specifically two-photon excited fluorescence microscopy, overcomes scattering limitations.
    • Localized nonlinear signal generation allows assignment of scattered photons to their origin.
    • Large depth penetration (hundreds of microns) is achieved in various animal organs.

    Conclusions:

    • Two-photon microscopy enables deep cellular imaging in living animals.
    • Understanding nonlinear signal generation is key to deep tissue imaging.
    • Nonlinear optical microscopy is a powerful tool for in vivo biological research.