RF safety assessment for a 32-ch body coil for 7T was performed based on SAR, tissue temperature, and a thermal dose model (CEM43°C). Temperature simulations considered a temperature-dependent thermoregulation. The tissue temperature limit is exceeded when SAR limits are adhered to. However, based on the thermal dose limit, the maximum input power determined from SAR limits can be exceeded by up to a factor of 5 without noticeable limitations in permissible exposure time in MR examinations. This increased input power allows for improved B1+ homogeneity with 50% reduced flip angle error compared to the input power determined from SAR limits.
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