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Related Experiment Video

Updated: Jun 1, 2026

Multimodal Volumetric Retinal Imaging by Oblique Scanning Laser Ophthalmoscopy (oSLO) and Optical Coherence Tomography (OCT)
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Multimodal Volumetric Retinal Imaging by Oblique Scanning Laser Ophthalmoscopy (oSLO) and Optical Coherence Tomography (OCT)

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Multi-modality optical neural imaging using coherence control of VCSELs.

Elizabeth A Munro1, Hart Levy, Dene Ringuette

  • 1Institute of Biomaterials and Biomedical Engineering, University of Toronto, 164 College Street, Toronto, Ontario M5S 3G9, Canada.

Optics Express
|June 7, 2011
PubMed
Summary

Vertical-cavity surface-emitting lasers (VCSELs) enable simultaneous optical imaging of brain blood flow and oxygenation. This technology offers a promising, low-noise solution for continuous monitoring of neural dynamics in moving animals.

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Area of Science:

  • Neuroscience
  • Biomedical Optics
  • Medical Imaging

Background:

  • Cortical hemodynamic fluctuations are key indicators of neural activity and disease states.
  • Optical imaging techniques are crucial for evaluating these dynamics.
  • Existing illumination sources may have limitations in noise and portability.

Purpose of the Study:

  • To evaluate vertical-cavity surface-emitting lasers (VCSELs) as an illumination source for simultaneous neural optical imaging.
  • To assess the capability of VCSELs for imaging blood flow and tissue oxygenation dynamics.
  • To demonstrate the potential of VCSELs for long-term, portable brain monitoring.

Main Methods:

  • Utilized VCSELs for simultaneous ex vivo and in vivo optical imaging of hemodynamic changes.
  • Implemented a rapid current sweep operation for VCSELs, switching between single-mode and multi-mode.
  • Induced ischemia to observe optical imaging responses in blood flow and oxygenation.

Main Results:

  • Demonstrated optical imaging of blood flow and oxygenation changes in response to induced ischemia.
  • Achieved reduced noise levels (within 40% of LED illumination) using VCSELs.
  • Showcased rapid switching capabilities of VCSELs between operational modes.

Conclusions:

  • VCSELs are effective illumination sources for simultaneous, high-resolution optical imaging of brain blood flow and oxygenation.
  • VCSELs offer significant noise reduction compared to traditional LED illumination.
  • The technology holds promise for developing portable, continuous monitoring systems for brain dynamics in freely moving animals.