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Numerical Modelling of a Close-fitting 8-channel Transceiver Head Coil and EEG Electrodes for Safety Validation at 7T

Paul Mcelhinney¹, Sarah Allwood-Spiers², Gavin Paterson¹, Marios Philiastides¹, and Shajan Gunamony¹
¹University of Glasgow, Glasgow, United Kingdom, ²NHS Greater Glasgow and Clyde, Glasgow, United Kingdom

Simulations show that the overall distribution of SAR within the human body models used is altered with the addition of the EEG cap, however the magnitude is either reduced, or only marginally altered.

SAR maps of the maximum axial, coronal and sagittal slices are shown for Duke and Ella at 0mm, with and without the presence of the EEG cap.

EEG cap and electrodes, shown on the sucrose/saline phantom (Fig.2a). View of the electrodes and the connecting wires on the sucrose phantom in CST. The lumped elements representing 5kΩ resistors are shown. Care was taken to distribute the wires in the same positions as the physical cap (Fig.2b). A similar model from CST showing the EEG electrodes in place on the Ella model. The lumped elements are hidden in this view (Fig.2c).