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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