Functional Mapping of the Human Visual Cortex at 4 and 1.5 Tesla Using Deoxygenation Contrast EPI

Overview

Journal Magn Reson Med

Publisher Wiley

Specialty Radiology

Date 1993 Feb 1

PMID 8429797

Citations 62

Authors

R Turner

P Jezzard

H Wen

K K Kwong

D Le Bihan

T Zeffiro

R S Balaban

Affiliations

Soon will be listed here.

Abstract

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.

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