Simultaneous EEG-fMRI acquisition: benefit and limitation

The combined investigation with EEG and fMRI makes use of the advantages of both methods, high spatial (fMRI) and time (EEG) resolution. The feasibility of simultaneous EEG recordings during acquisition of EPI-scanning has been demonstrated. However, EEG obtained simultaneously with fMRI is highly distorted by technical and biological artifacts. Artifacts include MR-gradient switching artifacts and artifacts caused by cardioballistic movements of the head. Although several artifact removal approaches coexist and partly are implemented in commercially available MR-compatible EEG-systems, methods are currently sti…