Related Experiment Video
Updated: Jun 12, 2026
12:22
Multimodal Volumetric Retinal Imaging by Oblique Scanning Laser Ophthalmoscopy (oSLO) and Optical Coherence Tomography (OCT)
Published on: August 4, 2018
Holographic laser Doppler ophthalmoscopy.
M Simonutti1, M Paques, J A Sahel
1Institut National de la Santé et de la Recherche Médicale-101, UMR-S 968, rue de Tolbiac, 75654 Paris Cedex 13, France.
Optics Letters
|June 16, 2010
Summary
Researchers developed a new laser Doppler imaging technique for rat retinas. This method visualizes retinal blood flow using holography, eliminating the need for contrast agents.
Area of Science:
- Ophthalmology
- Biomedical Optics
- Medical Imaging
Background:
- Assessing retinal vasculature is crucial for diagnosing eye diseases.
- Current methods often require exogenous contrast agents, which can pose risks.
- Non-invasive imaging techniques are highly desirable for retinal diagnostics.
Purpose of the Study:
- To develop and demonstrate a novel, non-invasive method for retinal angiography.
- To visualize the retinal vascular tree in vivo using laser Doppler ophthalmoscopy.
- To evaluate the efficacy of near-infrared heterodyne holography for functional ophthalmic imaging.
Main Methods:
- Employed laser Doppler ophthalmoscopy with near-infrared heterodyne holography.
- Utilized sequential sampling of reflected radiation against a frequency-shifted optical local oscillator.
- Recorded signals onto an array detector for wide-field imaging.
Main Results:
- Generated wide-field maps of fluctuation spectra in the 10 Hz to 25 kHz band.
- Achieved angiographic contrasts within the retinal vascular tree of the rat eye.
- Demonstrated successful imaging without the need for exogenous contrast agents.
Conclusions:
- Near-infrared heterodyne holography enables non-invasive laser Doppler ophthalmoscopy.
- This technique provides functional angiographic contrast of the retinal vasculature.
- The method holds potential for future diagnostic applications in ophthalmology.
