Whole-body Metamaterial Liner RF Coil for 1H at 4.7 T with Reduced SAR Compared to Birdcage Coil

The maximum local specific absorption rate relative to B₁⁺ field produced increases with B₀ field strength. This relationship greatly constrains the parameter space in sequence optimization due to safety limits. The metamaterial liner simulated here produces lower SAR for the same transmit excitation compared to conventional birdcage coils for whole body imaging, thereby permitting more power-intensive scan parameters to be used. The transmit efficiency and homogeneity is found to be similar between the metamaterial liner and comparable birdcage coil, while the metamaterial liner produces only 41% of the 10g localized SAR for the same transmit field.