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Related Experiment Video

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High-NA two-photon single cell imaging with remote focusing using a diffractive tunable lens.

Molly A May1, Martin Bawart1, Michiel Langeslag2

  • 1Institute of Biomedical Physics, Medical University of Innsbruck, Müllerstraße 44, 6020 Innsbruck, Austria.

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Summary

This study introduces a novel remote focusing technique for high-NA two-photon fluorescence microscopy. It enables fast, near diffraction-limited volumetric imaging of cellular structures in the brain.

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Area of Science:

  • Neuroscience
  • Optical Microscopy
  • Biophotonics

Background:

  • High-speed, volumetric imaging of cellular dynamics in the brain is crucial for neuroscience research.
  • Existing methods struggle with rapid axial scanning and maintaining image quality, especially in high numerical aperture (NA) systems.
  • Remote focusing offers potential for faster axial scanning but often introduces optical aberrations.

Purpose of the Study:

  • To develop and demonstrate a novel high-NA remote focusing method for volumetric two-photon fluorescence microscopy.
  • To achieve near diffraction-limited imaging speeds and resolution for cellular and sub-cellular structures in vivo.
  • To overcome the limitations of existing remote focusing techniques in high-NA systems.

Main Methods:

  • Implementation of a novel remote focusing technique utilizing a tunable lens for axial scanning.
  • Volumetric two-photon fluorescence microscopy with high numerical aperture (NA).
  • Imaging of single microglia cells in the living brain to assess sub-micron structural resolution.

Main Results:

  • Demonstrated near diffraction-limited volumetric imaging capabilities.
  • Successfully resolved deep sub-micron structures of single microglia cells.
  • Maintained image contrast within 7% of mechanical sample stepping.
  • Achieved a nearly diffraction-limited focal volume over an axial range exceeding 86 µm.

Conclusions:

  • The novel high-NA remote focusing method significantly advances volumetric two-photon microscopy.
  • This technique enables fast, high-resolution imaging of cellular dynamics in the brain.
  • It overcomes previous limitations, paving the way for improved neuroscience research.