  Simultaneous EEG/fMRI acquisition allows to measure brain activity at high
spatial-temporal resolution. The localisation of EEG sources depends on several
parameters including the position of the electrodes on the scalp. The position
of the MR electrodes during its acquisitions is obtained with the use of the
UTE sequence allowing their visualisation. The retrieval of the electrodes
consists in obtaining the volume where the electrodes are located by applying a
sphere detection algorithm. We detect around 90% of electrodes for each
subject, and our UTE-based electrode detection showed an average position error
of 3.7mm for all subjects.
