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Application of Optical Coherence Tomography to a Mouse Model of Retinopathy
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DIRECTIONAL OPTICAL COHERENCE TOMOGRAPHY IMAGING OF MACULAR PATHOLOGY.

Brandon J Lujan1, Shane M Griffin2, Vikram S Makhijani3

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

Retina (Philadelphia, Pa.)
|April 2, 2024
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Summary

Directional optical coherence tomography (OCT) reveals new details about retinal structures and pathology. This technique improves visualization of the outer nuclear layer and photoreceptor-related changes in various retinal diseases.

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Area of Science:

  • Ophthalmology
  • Medical Imaging
  • Retinal Science

Background:

  • Optical coherence tomography (OCT) is crucial for visualizing retinal layers.
  • Understanding directional reflectivity in OCT can enhance diagnostic capabilities.

Purpose of the Study:

  • To investigate the impact of directional reflectivity on retinal structures in optical coherence tomography (OCT) images.
  • To identify novel directionally reflective pathological features in retinal diseases.

Main Methods:

  • Analysis of commercial OCT image sets acquired from multiple pupil positions.
  • Characterization of hybrid and composite images, focusing on Henle fiber layer, outer nuclear layer, ellipsoid zone, and interdigitation zone.
  • Review of hybrid images for novel directionally reflective pathological findings.

Main Results:

  • Directional OCT improved visualization of the outer nuclear layer/Henle fiber layer interface, highlighting outer nuclear layer thinning.
  • Ellipsoid zone and interdigitation zone showed attenuation and orientation changes due to pathology.
  • Misdirected photoreceptors presented as consistent direction-dependent changes in ellipsoid zone reflectivity.

Conclusions:

  • Directional OCT significantly enhances the understanding of retinal anatomy and pathology.
  • This technique offers improved identification of retinal structures and potential imaging biomarkers for photoreceptor pathology.