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Related Experiment Videos

Ultrafast random-access scanning in two-photon microscopy using acousto-optic deflectors.

R Salomé1, Y Kremer, S Dieudonné

  • 1Laboratoire de Neurobiologie Moléculaire et Cellulaire, UMR CNRS 8544, Ecole Normale Supérieure, Département de Biologie, Paris, France.

Journal of Neuroscience Methods
|February 7, 2006
PubMed
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This study introduces a novel all-digital two-photon scanning microscopy (TPSM) system using acousto-optic deflectors (AODs). This random-access TPSM (RA-TPSM) enables high-speed, millisecond-resolution imaging of biological tissues.

Area of Science:

  • Neuroscience
  • Biophysics
  • Optical Imaging

Background:

  • Two-photon scanning microscopy (TPSM) offers deep tissue imaging with sub-cellular resolution.
  • Galvanometric mirrors limit TPSM's temporal resolution, hindering observation of fast physiological events.
  • Acousto-optic deflectors (AODs) offer non-mechanical, microsecond-timescale beam steering for improved temporal resolution.

Purpose of the Study:

  • To develop an all-digital TPSM system overcoming temporal resolution limitations.
  • To enable high-speed, random-access imaging of biological tissues.
  • To improve the spatial resolution and fluorescence excitation in TPSM.

Main Methods:

  • Implemented an all-digital TPSM setup utilizing two crossed acousto-optic deflectors (AODs).

Related Experiment Videos

  • Incorporated an acousto-optic modulator (AOM) to pre-compensate for spatial distortions caused by AODs with femtosecond pulses.
  • Enabled random access to freely selectable points of interest for recording.

    • Main Results:

    • Achieved high-speed recording (1kHz) from selected points of interest.
    • Optimized spatial resolution and fluorescence excitation through AOM-based pre-compensation.
    • Demonstrated the capability for millisecond-resolution multiunit recordings.

    Conclusions:

    • The developed random-access TPSM (RA-TPSM) significantly enhances temporal resolution.
    • This technique is promising for studying fast physiological events in biological tissues.
    • RA-TPSM facilitates efficient multiunit recordings by maximizing time on points of interest.