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High-throughput deep tissue two-photon microscopy at kilohertz frame rates.

Sheng Xiao1, John T Giblin1,2, David A Boas1,2

  • 1Department of Biomedical Engineering, Boston University, Boston, Massachusetts 02215, USA.

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We developed a new scanning method for two-photon microscopy (2PM) that achieves kilohertz frame rates. This breakthrough enables faster, deeper imaging of biological processes in living tissue, like brain activity.

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Area of Science:

  • Neuroscience
  • Biomedical Imaging
  • Optical Microscopy

Background:

  • High-speed imaging is crucial for observing rapid biological events.
  • Current two-photon microscopy (2PM) methods for millisecond resolution face technical challenges, limiting field of view, efficiency, and tissue penetration.
  • Existing techniques often involve complex setups and compromise imaging quality.

Purpose of the Study:

  • To present a versatile solution for achieving kilohertz frame rates in conventional two-photon microscopes (2PMs).
  • To overcome the limitations of existing high-speed 2PM strategies.
  • To enable high-throughput, deep-tissue imaging for studying dynamic biological processes.

Main Methods:

  • Implementation of a novel scan multiplier unit for inertia-free speed enhancement.
  • Utilizing a conventional video-rate 2PM system.
  • Achieving 2D scanning at kilohertz frame rates over large fields of view.

Main Results:

  • Demonstrated kilohertz subcellular-resolution 2PM imaging.
  • Achieved an order of magnitude higher imaging throughput compared to previous methods.
  • Attained penetration depths exceeding 500 μm in thick tissue.
  • Successfully applied the technique to study neurovascular coupling dynamics in the mouse brain.

Conclusions:

  • The developed scan multiplier unit offers a versatile and effective solution for high-speed 2PM.
  • This advancement significantly enhances imaging throughput and depth penetration without compromising 2PM benefits.
  • The system provides unprecedented capabilities for investigating fast biological phenomena, such as neurovascular dynamics in vivo.