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DTI of the Visual Pathway - White Matter Tracts and Cerebral Lesions
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Identifying the human optic radiation using diffusion imaging and fiber tractography.

Anthony J Sherbondy1, Robert F Dougherty, Sandy Napel

  • 1Department of Electrical Engineering, Stanford University, Stanford, CA, USA. sherbond@stanford.edu

Journal of Vision
|January 17, 2009
PubMed
Summary

Diffusion tensor imaging and fiber tractography precisely mapped white matter pathways from the retina to the cortex. This technique accurately identified Meyer

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Area of Science:

  • Neuroimaging
  • Neuroscience
  • Human Brain Anatomy

Background:

  • Understanding white matter pathways from retina to cortex is crucial for visual performance and clinical treatments.
  • The Meyer's loop portion of the optic radiation (OR) is clinically significant due to frequent temporal lobe resections.

Purpose of the Study:

  • To utilize diffusion tensor imaging and fiber tractography (DTI-FT) to identify the optic radiation pathway between the lateral geniculate nucleus (LGN) and the calcarine sulcus in healthy volunteers.
  • To quantitatively compare DTI-FT estimates with postmortem dissections for validation.

Main Methods:

  • Diffusion tensor imaging and fiber tractography (DTI-FT) were employed on sixteen hemispheres from eight healthy volunteers.
  • The optic radiation was segmented into three bundles: Meyer's loop, central, and direct, based on fiber direction from the LGN.
  • Quantitative comparisons were made between DTI-FT results and published postmortem dissection data.

Main Results:

  • DTI-FT successfully identified the optic radiation pathway with a spatial precision of approximately 1 mm, matching postmortem data.
  • The optic radiation was divided into Meyer's loop, central, and direct bundles.
  • No significant differences in longitudinal and radial diffusivities were found between the bundles, except for a minor difference in radial diffusivity between hemispheres.
  • The anterior tip of Meyer's loop was located 28 +/- 3 mm posterior to the temporal pole, with a population range of 1 cm.

Conclusions:

  • DTI-FT is a reliable method for mapping white matter pathways in the living brain, specifically the optic radiation.
  • The study provides precise anatomical localization of Meyer's loop, essential for clinical applications.
  • Identifying individual variations in Meyer's loop location is important for surgical planning and patient care.