Case Report: Practicability of functionally based tractography of the optic radiation during presurgical epilepsy work up

NEUROSCIENCE LETTERS

卷:568

Article

Schmitt, F. C.¹  Kaufmann, J.¹  Hoffmann, M. B.^2,3  Tempelmann, C.¹  Kluge, C.^1,3  Rampp, S.⁴  Voges, J.^5,6  Heinze, H. J.^1,6  Buentjen, L.⁵  Grueschow, M.^1,7 

[1] Otto Von Guericke Univ, Dept Neurol, D-39120 Magdeburg, Germany

[2] Otto Von Guericke Univ, Dept Ophthalmol, D-39120 Magdeburg, Germany

[3] Otto Von Guericke Univ, Ctr Behav Brain Sci, D-39106 Magdeburg, Germany

[4] Univ Erlangen Nurnberg, Epilepsy Ctr Erlangen, D-91054 Erlangen, Germany

[5] Otto Von Guericke Univ, Dept Stereotact Neurosurg, D-39120 Magdeburg, Germany

[6] Leibnitz Inst Neurobiol, D-39120 Magdeburg, Germany

[7] Univ Zurich, Dept Econ, CH-8006 Zurich, Switzerland

关键词: DTI;    Retinotopy;    Lateral geniculate nucleus;    Primary visual cortex;   

DOI  :  10.1016/j.neulet.2014.03.049

来源: Elsevier

【 摘 要 】

Pre-operative tractography of the optic radiation (OR) has been advised to assess the risk for postoperative visual field deficit (VFD) in certain candidates for resective epilepsy surgery. Diffusion tensor imaging (DTI) tractography relies on a precise anatomical determination of start and target regions of interest (ROls), such as the lateral geniculate nucleus (LGN) and the primary visual cortex (V1). The post-chiasmal visual pathway and VI show considerable inter-individual variability, and in epilepsy patients parenchymatous lesions might further complicate this matter. A functionally based tractography (FBT) seems beneficial for precise OR identification. We assessed practicability of FBT for OR identification in a patient with occipital lobe epilepsy due to a temporo-occipital maldevelopmental tumor. The MRI protocol at 3T included a T1-weighted sagittal 3D scan, a T2-weighted axial 2D scan and a DTI scan using an echo planar spin echo sequence. ROls for fiber tracking of OR (LGN & Vi) were determined with T2*-weighted fMRI-based retinotopic assessment. After DTI pre-processing and fiber tracking, paths with similar properties were combined in clusters for visual presentation and OR localization. Retinotopic phase maps allowed for the identification of V1 and LGN for a precise DTI-based reconstruction of OR, which was distant to the patient's tumor. Location and structure of ORs were comparable in each hemisphere. FBT could thus influence the human research of the extrastriate visual pathway and the risk management of post-operative VFD in epilepsy surgery. (C) 2014 Elsevier Ireland Ltd. All rights reserved.

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