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Optic nerve --> Monocular homolateral blindness Optic nerve - Optic chiasm junction --> Monocular homolateral blindness. Temporal superior junctional scotoma Optic chiasm  --> Bitemporal hemianopsia Optic tracts --> Contralateral non-congruent lateral homonymous hemianopsia Principal optic radiations --> Contralateral congruent lateral homonymous hemianopsia Optic nerve - Optic chiasm junction --> Monocular homolateral blindness. Temporal superior junctional scotoma Optic tracts --> Contralateral non-congruent lateral homonymous hemianopsia Principal optic radiations --> Contralateral congruent lateral homonymous hemianopsia Optic nerve --> Monocular homolateral blindness

Link between neurological visual field defects and injury localization on an optic pathway tractography

Nicolas Coste - Clinique Universitaire de Neuroradiologie - CHU de Grenoble

Arnaud Attyé - Clinique Universitaire de Neuroradiologie - CHU de Grenoble

Illustrations : Cédric Mendoza

Francais English


-Tractographie probabiliste des voies optiques réalisée par un modèle d'ordre élevé (Déconvolution Sphérique contrainte, MRTrix® package software, J-D Tournier, Brain Research Institute, Melbourne, Australia, http://www.brain.org.au/software)

-Méthode des régions d'intérêt multiples: Nerfs optiques, chiasma optique, bandelettes optiques, radiations optiques.

-Reconstructions itératives de 5000 fibres, Minimum de FA: 0.1, Terme d'harmonique sphérique=6


Reférences:

1/Tournier J-D, Calamante F, Gadian DG, Connelly A (2004) Direct estimation of the fiber orientation density function from diffusion-weighted MRI data using spherical deconvolution. Neuroimage 23:1176–1185.

2/Tournier J-D, Calamante F, Connelly A (2007) Robust determination of the fibre orientation distribution in diffusion MRI: non-negativity constrained super-resolved spherical deconvolution. Neuroimage 35:1459–1472.

3/Quantitative volumetric analysis of the optic radiation in the normal human brain using diffusion tensor magnetic resonance imaging-based tractography. Lee DH, Park JW, Hong CP. Neural Regen Res. 2014 Feb 1;9(3):280-4

4/Evaluating Contextual Processing in Diffusion MRI: Application to Optic Radiation Reconstruction for Epilepsy Surgery. Tax CM, Duits R, Vilanova A, Ter Haar Romeny BM, Hofman P, Wagner L, Leemans A, Ossenblok P. PLoS One. 2014 Jul 31;9(7):

5/http://www.campusdanatomie.org/sites/default/files/users/admin/voiesoptiques_sans_legende.pdf