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Table 1: Global and peak SAR levels
Duke Centered Ella Centered Charlie Centered Charlie −50-mm FH Charlie +50-mm FH
Global SAR levels 
 Average SAR for 1 Watt input  power (W kg⁻¹) 0.066 0.069 0.062 0.050 0.075
 Average SAR per B₁² (W kg⁻¹ µT^–2) 0.462 0.465 0.289 0.454 0.474
 Average B₁⁺ in central section  for 1 Watt input power (µT)^{^a} 0.379 0.385 0.466 0.333 0.398
Peak local SAR levels 
 Peak local SAR (10-g averaged)  for 1 Watt input power (W kg⁻¹) 0.435 0.398 0.321 0.213 0.487
 Peak local SAR (10-g averaged)  per B₁² (W kg⁻¹µT^–2) 3.04 2.63 1.48 1.92 3.08
↵a The power optimization procedure of the MR imaging scanner software calibrates the needed input power to achieve a certain B₁ in the subject. This calibration is based on the average B₁⁺ in a central section of the subject (brain in this case).