How to Reach the Full Potential of the B1+ Efficiency for a 7T Body Transmit Array?

Ozlem Ipek¹, Alexander J. E. Raaijmakers¹, Dennis W. J. Klomp², Johannes M. Hoogduin², Peter R. Luijten², Jan J. W. Lagendijk¹, Cornelis A. T. van Den Berg¹

The discrepancy if the B1+ value at prostate in measurement (10 T ) and simulation (20 T) is studied for 8 elements radiative antenna transmit surface array. The phase shimming was determined to obtain constructive B1+ interference in the prostate from the voltage phases of individual simulations. As the phase of the transmitted B1+ field of an element is not proportional to the feeding voltage but to the total current in an element we determined in simultaneously-driven elements, the voltage sources settings that would result in current phase setting from individual-driven elements. This solved the discrepancy problem.