Multimodal high-resolution retinal imaging using a camera-based DMD-integrated adaptive optics flood-illumination...

Area of Science:

• Ophthalmology
• Biomedical Optics
• Retinal Imaging Technology

Background:

• Adaptive optics ophthalmoscopy enables high-resolution retinal imaging.
• Current techniques may have limitations in contrast and visualization of translucent structures.

Purpose of the Study:

• To demonstrate a multimodal adaptive optics flood-illumination ophthalmoscope.
• To enhance imaging capabilities for both bright-field and dark-field (phase contrast) retinal visualization.

Main Methods:

• Integration of a digital micromirror device (DMD) in the illumination path.
• Projection of patterned illumination sequences onto the retina.
• Post-processing to select specific photon scattering for image reconstruction.

Main Results:

• Achieved up to a four-fold contrast increase in bright-field imaging of photoreceptors and nerve fibers.
• Successfully visualized translucent retinal features including capillaries, red blood cells, and ganglion cells using phase contrast.
• Demonstrated the feasibility of multimodal imaging with a single device.

Conclusions:

• The developed ophthalmoscope offers enhanced contrast and visualization capabilities for retinal structures.
• This multimodal approach provides a versatile tool for detailed retinal examination.
• The technology holds potential for improved diagnosis and understanding of retinal diseases.