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Fluorescence radial fluctuation enables two-photon super-resolution microscopy.

Motosuke Tsutsumi1,2, Taiga Takahashi1,2, Kentaro Kobayashi3

  • 1Biophotonics Research Group, Exploratory Research Center on Life and Living Systems, National Institutes of Natural Sciences, Okazaki, Japan.

Frontiers in Cellular Neuroscience
|October 26, 2023
PubMed
Summary

Super-resolution radial fluctuation (SRRF) microscopy combined with two-photon imaging enables deep brain visualization. This novel 2P-SRRF technique achieves high spatial resolution and morphological reproducibility in vivo.

Keywords:
SRRFin vivo imagingspine morphologysuper-resolutiontwo-photon microscopy

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Area of Science:

  • Neuroscience
  • Microscopy
  • Biophysics

Background:

  • Deep super-resolution imaging is limited by light scattering in thick specimens.
  • Super-resolution radial fluctuation (SRRF) offers a potential solution by relying on image analysis rather than optical manipulation.
  • Existing super-resolution techniques struggle with penetration depth in biological tissues.

Purpose of the Study:

  • To apply SRRF to two-photon microscopy (2P-SRRF) for deep super-resolution imaging.
  • To characterize the performance of 2P-SRRF in terms of spatial resolution, imaging depth, and morphological reproducibility.
  • To demonstrate the feasibility of 2P-SRRF for in vivo imaging in the brain.

Main Methods:

  • Integration of SRRF image analysis with a two-photon microscopy setup.
  • Characterization of spatial resolution and morphological reproducibility by comparison with structured illumination microscopy (SIM).
  • Testing of 2P-SRRF performance in brain-mimetic environments at depths exceeding several hundred micrometers.
  • Optimization of SRRF processing parameters for in vivo imaging.

Main Results:

  • 2P-SRRF achieved spatial resolution and morphological reproducibility comparable to SIM.
  • Significant improvement in spatial resolution was observed at depths over several hundred micrometers.
  • Successful in vivo high-resolution imaging of the cerebral cortex's fifth layer was demonstrated.
  • The method is compatible with existing two-photon microscopes.

Conclusions:

  • 2P-SRRF overcomes optical limitations for deep super-resolution imaging.
  • This technique significantly expands the visualization capabilities for neuroscience research.
  • SRRF applied to two-photon microscopy represents a breakthrough for in vivo super-resolution studies.