Functional mapping of the human visual cortex at 4 and 1.5 tesla using deoxygenation contrast EPI. - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Magnetic Resonance in Medicine Année : 1993

Functional mapping of the human visual cortex at 4 and 1.5 tesla using deoxygenation contrast EPI.

Résumé

The effects of photic stimulation on the visual cortex of human brain were studied by means of gradient-echo echo-planar imaging (EPI). Whole-body 4 and 1.5 T MRI systems, equipped with a small z axis head gradient coil, were used. Variations of image intensity of up to 28% at 4 T, and up to 7% at 1.5 T, were observed in primary visual cortex, corresponding to an increase of blood oxygenation in regions of increased neural activity. The larger effects at 4 T are due to the increased importance of the susceptibility difference between deoxygenated and oxygenated blood at high fields.

Domaines

Imagerie
Fichier non déposé

Dates et versions

hal-00350011 , version 1 (05-01-2009)

Identifiants

  • HAL Id : hal-00350011 , version 1
  • PUBMED : 8429797

Citer

R. Turner, P. Jezzard, H. Wen, K. K. Kwong, D. Le Bihan, et al.. Functional mapping of the human visual cortex at 4 and 1.5 tesla using deoxygenation contrast EPI.. Magnetic Resonance in Medicine, 1993, 29 (2), pp.277-9. ⟨hal-00350011⟩
29 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More