. Author manuscript; available in PMC: 2018 Jul 1.

Published in final edited form as: Magn Reson Med. 2016 Oct 7;78(1):383–386. doi: 10.1002/mrm.26344

Table 1.

Results of head coil former on SAR_1g around the implanted lead tips and B₁ field homogeneity on the mid-transverse slice in brain as well as in the entire cerebrum with the body coil driven to produce a 1μT B₁⁺ field at the center of brain.

Relative permittivity of the head coil former	Peak SAR/\|B1+\|² W/kg/(μT)²	Coefficient of Variation of \|B1+\| on transverse plane	Coefficient of Variation of \|B1+\| in cerebrum
1	0.1153	0.0763	0.1408
300	0.0717	0.0738	0.1092
400	0.0530	0.0697	0.1076
500	0.0392	0.0688	0.1053
600	0.0306	0.0665	0.0981
700	0.0229	0.0683	0.1041
900	0.0152	0.0692	0.1208