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In-depth polarisation resolved SHG microscopy in biological tissues using iterative wavefront optimisation.

Dmitry Nuzhdin1, Emily G Pendleton2, Eleanor B Munger1

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Summary
This summary is machine-generated.

This study enhances deep tissue imaging using wavefront shaping to improve polarization control in nonlinear microscopy. This allows for clearer visualization of collagen organization in biological samples at greater depths.

Keywords:
SHG microscopyadaptive opticscollagenpolarisationwavefront shaping

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Area of Science:

  • Biomedical Optics
  • Molecular Imaging
  • Biophysics

Background:

  • Polarized nonlinear microscopy, particularly Polarization Second Harmonic Generation (PSHG), is vital for studying collagen organization in tissues.
  • SHG imaging depth is limited by scattering and wavefront aberrations, typically to ~100 micrometers.
  • Maintaining polarization control is critical for quantitative PSHG measurements.

Purpose of the Study:

  • To investigate the impact of optical depth penetration on polarization control quality in PSHG imaging.
  • To develop and evaluate wavefront shaping techniques for enhancing PSHG signal quality at depth.
  • To enable in-depth PSHG imaging in collagen-rich biological tissues.

Main Methods:

  • Applied adaptive optics for shallow-depth aberration correction.
  • Utilized wavefront shaping of higher spatial frequencies for deeper focus correction.
  • Employed nonlinear SHG active nanocrystals as guide stars for optimization.
  • Tested methods on tendon and mouse cranial bone tissues.

Main Results:

  • Demonstrated successful correction of wavefront aberrations and scattering effects.
  • Quantified the recovery of high-quality linear polarization at increased depths.
  • Showcased the potential for significantly improved in-depth PSHG imaging.

Conclusions:

  • Wavefront shaping effectively restores polarization control for deep-tissue PSHG imaging.
  • This approach overcomes current depth limitations in collagen organization studies.
  • Enables advanced quantitative molecular analysis in intact biological tissues.