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Related Concept Videos

Glaucoma: Overview01:25

Glaucoma: Overview

Glaucoma is an eye condition characterized by increased intraocular pressure that damages the retina and optic nerve, leading to irreversible blindness if left untreated. The human eye has various components, including the cornea, iris, pupil, lens, and optic nerve. Aqueous humor is secreted by the epithelium of the ciliary body in the posterior chamber and flows through the trabecular meshwork and canal of Schlemm, maintaining normal intraocular pressure. The trabecular meshwork and the canal...
Open Angle Glaucoma: Treatment01:27

Open Angle Glaucoma: Treatment

In open-angle glaucoma, the iridocorneal angle remains open, but the trabecular meshwork becomes stiff, slowing down the outflow of aqueous humor. This causes a buildup of aqueous humor in the anterior chamber, leading to a sudden increase in intraocular pressure. The treatment for open-angle glaucoma focuses on reducing the elevated intraocular pressure by either decreasing the secretion of aqueous humor or increasing its outflow.
Drugs such as carbonic anhydrase inhibitors, α2- and...

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Related Experiment Video

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Functional Magnetic Resonance Imaging (fMRI) of the Visual Cortex with Wide-View Retinotopic Stimulation
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A framework for voxel-based morphometric analysis of the optic radiation using diffusion tensor imaging in glaucoma.

Ahmed El-Rafei1, Tobias Engelhorn, Simone Wärntges

  • 1Pattern Recognition Lab, Department of Computer Science, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany. ahmed.el-rafei@informatik.uni-erlangen.de

Magnetic Resonance Imaging
|August 2, 2011
PubMed
Summary

This study introduces a new framework using diffusion tensor imaging to pinpoint local optic radiation changes in glaucoma patients, revealing localized white matter degeneration. This advances understanding of glaucoma

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Area of Science:

  • Neuroimaging
  • Ophthalmology
  • Medical Physics

Background:

  • Glaucoma is an optic neuropathy impacting the visual system, with unresolved mechanisms.
  • Diffusion tensor imaging (DTI) has shown global optic nerve and radiation abnormalities in glaucoma.
  • Localizing glaucoma's effects within the optic radiation is challenging due to its complex structure and DTI limitations.

Purpose of the Study:

  • To establish a framework for determining local changes in the optic radiation caused by glaucoma using DTI.
  • To enable precise identification and analysis of localized white matter alterations in glaucoma patients.

Main Methods:

  • A semiautomated algorithm for efficient optic radiation identification.
  • Shape-based nonrigid registration to transform segmented optic radiations into a unified space.
  • Voxel-wise statistical analysis of diffusion tensor parameters using deformation fields to create abnormality maps.

Main Results:

  • Decreased fractional anisotropy in significant voxels of glaucoma patients compared to controls.
  • Significant abnormalities concentrated in the middle (anterior-posterior) of the optic radiation.
  • Increased radial and mean diffusivity in proximal regions of the right optic radiation in glaucoma subjects.

Conclusions:

  • The developed framework effectively captures significant local changes in the optic radiation due to glaucoma.
  • Preliminary findings suggest localized white matter degeneration in the glaucomatous optic radiation.
  • This framework supports further research into glaucoma's pathophysiology.