Angiographic and structural imaging using high axial resolution fiber-based visible-light OCT.

Area of Science:

• Biomedical Optics
• Ophthalmology
• Medical Imaging

Background:

• Conventional optical coherence tomography (OCT) often requires broad spectral bandwidth for high axial resolution.
• Visible-light OCT offers a potential alternative for enhanced resolution without spectral broadening.

Purpose of the Study:

• To develop and evaluate a high-resolution, fiber-based, visible-light OCT system.
• To demonstrate the system's capability in imaging biological tissues, specifically retinal layers and microvasculature.

Main Methods:

• Construction of a novel fiber-based, visible-light OCT system.
• Imaging of normal rat retina to assess retinal layer segmentation and thickness.
• Imaging of chicken embryo vasculature to examine microvascular networks and vessel walls.

Main Results:

• Accurate segmentation and quantification of retinal layer boundaries in rats.
• Identification of three distinct retinal capillary plexuses and the choriocapillaris in rats.
• Revealed characteristic nerve fiber layer thickness patterns in rats.
• Examination of microvascular networks and venous bifurcations in chicken embryos.
• Demonstrated ability to identify and segment large vessel walls in chicken embryos.

Conclusions:

• Visible-light OCT provides high axial resolution, advantageous for detailed tissue imaging.
• The developed system successfully imaged rat retinal structures and chicken embryo vasculature.
• This technology shows promise for advanced studies in retinal layer analysis and microvascular imaging.