. Author manuscript; available in PMC: 2019 Jul 1.

Published in final edited form as: Magn Reson Med. 2017 Nov 28;80(1):391–399. doi: 10.1002/mrm.27022

Table 1.

Comparison of RF Shimming Methods for a 48-element Array with HPM: Global SAR for the phase variable case normalized by the UISAR for the phase-constrained case at the RMSE reached. Optimal relative permittivity (*) does not change with the phase variable shimming method, and SAR/UISAR and RMSE trends appear unchanged.

	Phase Constrained		Phase Variable
ε_R	SAR/UISAR	RMSE	SAR/UISAR	RMSE
1	1.87725E+15	0.054402	1.84143E+15	0.052239

50	1.18203E+15	0.051043	1.16777E+15	0.050245

75	5.59597E+14	0.050302	5.47761E+14	0.049628

*100	2.17741E+14	0.049977	2.09344E+14	0.049361

125	9.68836E+13	0.049821	9.20353E+13	0.04932

150	7.89397E+13	0.049738	7.64111E+13	0.049174