Feasibility of a Local SAR Monitoring for a 7T Body Transmit Array with Single Element Power Monitoring

Ozlem Ipek¹, Alexander J. E. Raaijmakers¹, Dennis W. J. Klomp², Alessandro Sbrizzi³, Peter R. Luijten², Jan J. W. Lagendijk¹, Cornelis A. T. van Den Berg¹

7 T prostate imaging with a radiative antenna (single-side adapted dipole antenna) surface array was simulated with FDTD to investigate the worst-case local SAR compared to the SAR distribution of each individually simulated element. Worst- case SAR is calculated from sum of magnitudes of E fields of individually driven elements of the array. There is a correlation between the SAR hotspots for the single element and a worst case combination of all elements: 1) the location is identical 2) the single element values correlate with worst case combination but a maximum under estimation of 80% is possible.