Automatic Electrodes Detection during simultaneous EEG/fMRI acquisition

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