RECORDINGS OF EYE-MOVEMENTS FOR STIMULUS CONTROL DURING FMRI BY MEANSOF ELECTROOCULOGRAPHIC METHODS

A method for monitoring eye movements in humans during functional MRI is presented. It is based on the acquisition of electro-oculographic ( EOG) signals near one eye. EOG potentials were amplified and converted into an optical signal just outside the head coil, An optical fiber w as used for signal transmission from inside the magnet bore to the con trol room. The EOG sensor was tested during EPI sequences at 1.5 Tesla without contamination of the MR signal. Some flow related artifacts o n the EOG were observed inside the magnet, but no additional interacti ons from the MR sequence. An analysis of the latency, direction, and a mplitude of the saccadic eye movements was possible.