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L'IRM fonctionnelle est une technique d'imagerie en plein essor qui offre la possibilité d'examiner en totale innocuité les fonctions cérébrales dévolues à une situation donnée. Elle est constituée de trois modalités majeures : 1) la diffusion, étudiant les mouvements des molécules d'eau dans l'espace extracellulaire ; 2) la perfusion, étudiant la vascularisation ; et 3) l'activation, étudiant le...
To estimate the magnitude of hyperemia necessary to support oxidative metabolism in the cerebral cortex during functional activation, a mathematical model of O 2 transport from capillary to tissue was developed. Radial and axial gradients of O 2 pressure in tissue surrounding a single capillary were calculated at normal and increased cerebral metabolic rates for O 2 . Cone-shaped...
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