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Abstract #3871

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

1Radiotherapy, UMC Utrecht, Utrecht, Netherlands; 2Radiology, UMC Utrecht, Utrecht, Netherlands

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.