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.
Keywords