Adaptive optics-optical coherence tomography: optimizing visualization of microscopic retinal structures in three...

Area of Science:

• Ophthalmology
• Biomedical Imaging
• Optical Engineering

Background:

• Traditional imaging techniques like AO and OCT have limitations in resolving microscopic retinal structures.
• There is a need for in vivo imaging methods capable of visualizing three-dimensional (3D) cellular details of the retina.

Purpose of the Study:

• To present the capabilities of adaptive optics-optical coherence tomography (AO-OCT) for high-resolution 3D retinal imaging.
• To demonstrate the visualization of microscopic retinal structures not previously observable with existing technologies.

Main Methods:

• Utilized a spectrometer-based Fourier-domain OCT system integrated with two-deformable-mirror adaptive optics (AO) wavefront correction.
• Developed image processing techniques to mitigate motion artifacts in volumetric data.
• Implemented innovative 2D and 3D data visualization methods.

Main Results:

• AO-OCT achieved the narrowest 3D point-spread function (PSF) among all in vivo retinal imaging techniques.
• Enabled the first-ever acquisition of 3D cellular structures in the living retina.
• Successfully visualized structures such as retinal nerve fiber layer bundles, photoreceptor mosaics, microvasculature, and retinal disruptions.

Conclusions:

• AO-OCT significantly advances in vivo retinal imaging by combining high lateral and axial resolutions.
• This technology allows for detailed visualization of microscopic retinal structures in three dimensions.
• The presented methods and results showcase AO-OCT's potential for retinal research and clinical applications.