Effects of Head Size and Position on SAR

Mikhail Kozlov¹, Robert Turner

We investigated effects of head size and position on SAR for a commercially available Rapid BioMed 7 T 8-element head coil. For this coil axial rotation of the head can be considered safe, if the distance to lumped capacitors is more than 20 mm. It is more dangerous to use this coil with the head only partly inserted. The total head SAR should be considered as the important safety limit, because the 3.2 W/kg whole head SAR limit is reached sooner than the 10W/kg local SAR limit.