Do Constraints On |B1+| Also Constrain |E| & SAR in High Field MR?

Leeor Alon^1,2, Cem Murat Deniz^1,2, Daniel K. Sodickson^1,2, Yudong Zhu^1,2

Since the local specific absorption rate (SAR) is difficult to measure in vivo, one approach to ensure patient safety utilizes simulation software such as xFDTD to compare simulated and measured |B1+| fields, under the assumption that a high correlation between the two implies that the simulated local electric fields also align with the unmeasured experimental local electric fields. The numerical simulation results in this abstract indicate, however, that substantial variations in electric field and SAR are indeed possible with minimally-varying |B1+| in the setting of distinct tissue properties at 7T field strength.