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Optical microscopy uses optic principles to provide detailed images of samples. Antonie van Leeuwenhoek designed the first compound optical microscope in the 17th century to visualize blood cells, bacteria, and yeast cells. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes with enhanced magnification and resolution.
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Phase-Contrast Microscopes
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Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.
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Split-Spectrum Amplitude-Decorrelation Optoretinography Detects Impaired Photoreceptor Function in Age-Related Macular Degeneration.

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Doppler Optical Coherence Tomography of Retinal Circulation
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Volumetric directional optical coherence tomography.

Shuibin Ni1,2, Shanjida Khan1,2, Thanh-Tin P Nguyen1

  • 1Casey Eye Institute, Oregon Health & Science University, Portland, Oregon 97239, USA.

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|March 14, 2022
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Summary
This summary is machine-generated.

A new Volumetric Directional OCT (VD-OCT) system visualizes the Henle

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Area of Science:

  • Ophthalmology
  • Medical Imaging
  • Biomedical Engineering

Background:

  • Photoreceptor loss and outer nuclear layer (ONL) thinning are key indicators of retinal degeneration, crucial for diagnosing conditions like age-related macular degeneration.
  • Standard optical coherence tomography (OCT) struggles to clearly delineate the boundary between the ONL and Henle's fiber layer (HFL).
  • Existing OCT systems lack the capability for precise, dynamic control of imaging beam entry points during volumetric scans.

Purpose of the Study:

  • To introduce a novel Volumetric Directional OCT (VD-OCT) system designed for enhanced retinal imaging.
  • To overcome the limitations of standard OCT in visualizing the ONL-HFL junction.
  • To enable earlier identification of retinal diseases through improved imaging.

Main Methods:

  • Development of a novel VD-OCT system capable of dynamically adjusting the incident beam on the pupil during volumetric scanning without manual intervention.
  • Implementation of a customized spoke-circular scanning pattern to optimize visualization of the HFL.
  • Utilizing directional reflectivity properties of retinal tissue layers for enhanced contrast.

Main Results:

  • The VD-OCT system successfully demonstrated dynamic adjustment of the imaging beam.
  • The customized scanning pattern provided sufficient optical contrast to visualize the HFL.
  • The technology facilitates continuous cross-sectional scans through the entire volume, improving visualization of retinal layers.

Conclusions:

  • VD-OCT represents a significant advancement in retinal imaging technology.
  • This novel system overcomes critical visualization challenges in standard OCT.
  • VD-OCT holds promise for the early detection and monitoring of retinal degenerations.