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Abstract #1864

RF safety assessment of simultaneous EEG-fMRI at 7T MR

zlem Ipek 1 , Joao Jorge 2,3 , Frederic Grouiller 4 , Wietske van der Zwaag 1 , Lijing Xin 2 , and Rolf Gruetter 2,5

1 CIBM-AIT, EPFL, Lausanne, Vaud, Switzerland, 2 LIFMET, EPFL, Lausanne, Vaud, Switzerland, 3 Bioengineering, University of Lisbon, Lisbon, Portugal, 4 CIBM, Geneva University Hospital, Geneva, Switzerland, 5 Radiology, University of Lausanne, Lausanne, Vaud, Switzerland

An exact model of a 64-channel EEG cap and the RF-coil was simulated, and B1+ and SAR distributions across the human head evaluated with/without the presence of the EEG cap. Simulation results were complemented by experimental B1+ and temperature measurements from a human subject with simultaneous EEG acquisition, using both RF volume and surface coils at 7T MR. No RF-safety concern is raised for simultaneous EEG-fMRI at 7T MR with the current setup. However, with the introduction of the EEG cap, a pronounced RF shielding effect is found, which leads to a decrease in the RF efficiency in the subject.

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