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Magn Reson Med. 1997 Nov;38(5):699-705.

An in vivo model for functional MRI in cat visual cortex.

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Unit on MRI Physics, LBC, NIMH, NIH, Bethesda, MD 20892-1366, USA.


A protocol is described for obtaining functional magnetic resonance images in anesthetized cat brain based on the blood oxygenation level dependent (BOLD) contrast mechanism. A visual stimulus was used, which consisted of a high-contrast drifting grating, whose speed and spatial frequency was optimized for cat area 18 (V2). Experiments were conducted at 4.7 Tesla using a gradient echo EPI sequence with a 29-ms echo time, yielding signal changes of between 0.7% and 2% in area 18.

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