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Polarization-resolved Second Harmonic microscopy in anisotropic thick tissues.

Ivan Gusachenko1, Gaël Latour, Marie-Claire Schanne-Klein

  • 1Laboratory for Optics and Biosciences, Ecole Polytechnique, CNRS, INSERM U696, 91128 Palaiseau, France.

Optics Express
|October 14, 2010
PubMed
Summary
This summary is machine-generated.

We developed a model for Second Harmonic Generation (SHG) imaging in thick tissues, accounting for light scattering and polarization changes. This method accurately measures tissue birefringence and diattenuation, improving imaging depth and reliability.

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Area of Science:

  • Biophysics
  • Optical Imaging
  • Materials Science

Background:

  • Polarization-resolved Second Harmonic Generation (SHG) imaging is sensitive to tissue structure.
  • Linear propagation effects like birefringence and diattenuation can distort SHG signals in thick anisotropic tissues.
  • Scattering of the harmonic signal further complicates image interpretation.

Purpose of the Study:

  • To develop a theoretical model for polarization-resolved SHG imaging in thick anisotropic tissues.
  • To account for birefringence, diattenuation, and polarization scrambling effects.
  • To establish a reliable method for quantifying tissue optical properties.

Main Methods:

  • Developed a theoretical model incorporating birefringence and diattenuation during excitation propagation.
  • Modeled polarization scrambling of the harmonic signal due to scattering.
  • Acquired polarization-resolved SHG images at increasing depths in rat-tail tendon.
  • Analyzed SHG depth profiles and the ratio ρ = Χxxx/Χxyy.

Main Results:

  • Excellent agreement between the theoretical model and experimental SHG images.
  • Observed interference fringes in SHG depth profiles due to birefringence.
  • Measured artifactual decrease of ρ with depth caused by excitation diattenuation.
  • Successfully derived a method to determine tissue birefringence and diattenuation.

Conclusions:

  • Linear propagation effects significantly impact SHG imaging in thick anisotropic tissues.
  • The developed model accurately predicts and explains observed SHG phenomena.
  • The derived method reliably quantifies birefringence and diattenuation in collagenous tissues.
  • This work enhances the accuracy and depth penetration of SHG imaging for biological tissues.