Ulrike Nth1, Helmut Laufs, 1,2, Robert Stoermer3, Ralf Deichmann1
1Brain Imaging Center (BIC), Goethe University Frankfurt am Main, Frankfurt am Main, Germany; 2Department of Neurology, Goethe University Frankfurt am Main, Frankfurt am Main, Germany; 3Brain Products GmbH, Gilching, Germany
The heating beneath eight EEG scalp electrodes during simultaneous EEG-MRI acquisition was measured in vivo, using various MR sequences covering a wide range of SAR values. RF transmission was performed with a head and a body coil in comparison. Temperature increases beneath the electrodes were stronger and more frequent for the body coil, and fitted equilibrium temperatures reached the critical level of 41C for high SAR sequences. This is of special interest as many scanners are not routinely equipped with a head transmit coil.