Fig. 2. Correspondence between the peak local SAR and resonant properties of surface coils for body imaging at 7 T.

a ${\mathbf{B}}_{\mathbf{1}}^{\mathit{+}}/\sqrt{\mathrm{SAR}}$ factor for different depths of ROI; b reflection coefficient at the input of a coil; simulated local SAR patterns at 1 W of accepted transmit power at the top surface of the phantom: c stripline; d fractionated dipole; e slot and f loop coil.