Objective visual field testing with functional magnetic resonance imaging
| Autor: | Marie-Thérèse Iba-Zizen, Jean Louis Stievenart, Thien Huong Nguyen, Emmanuel Alain Cabanis, Masaki Yoshida, Masahiro Ida, Genichiro Takahashi, Kenji Kitahara, Takaaki Hara, Shinsuke Kikuchi |
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| Rok vydání: | 2001 |
| Předmět: |
Physics
genetic structures medicine.diagnostic_test business.industry Stimulation eye diseases Visual field Ophthalmology Normal volunteers Nuclear magnetic resonance Optics Checkerboard Retinotopy medicine Visual field testing Neurology (clinical) Visual angle Functional magnetic resonance imaging business |
| Zdroj: | Neuro-Ophthalmology. 26:109-117 |
| ISSN: | 1744-506X 0165-8107 |
| DOI: | 10.1076/noph.26.2.109.10311 |
| Popis: | Purpose : To detect cortical retinotopy using the functional magnetic resonance imaging technique at clinical circumstances. Methods : Four normal volunteers were examined. Four experiments were performed on each subject: a ‘central-peripheral’ visual field stimulation and an ‘upper-lower’ visual field stimulation, both for right and left visual hemifields. The checkerboard stimuli, presented on a front projection screen, subtended 3 degrees of visual angle in height and 5 degrees in width. Sequential paradigms alternated rest phases with no checkerboard stimulation and stimulation phases. For the ‘central-peripheral’ visual field stimulation, the checkerboard was presented to either the central or peripheral visual field. During the ‘upper-lower’ visual field stimulation, the checkerboard was presented to either the upper or lower visual field. Results : The central visual field stimulation revealed a broad activated area in the contralateral occipital pole, whereas the peripheral visual field stimulatio... |
| Databáze: | OpenAIRE |
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