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Abstract #0241

Rapid online multiband RF peak power minimization for CAIPIRINHA and pTX-multi-slice shims by inter-slice phase relaxation

Alessandro Sbrizzi 1 , Benedikt Poser 2 , Desmond H Y Tse 2 , Hans Hoogduin 3 , Peter R Luijten 3 , and Cornelis A van den Berg 3

1 UMC Utrecht, Utrecht, Utrecht, Netherlands, 2 Faculty of Psychology and Neuroscience, Maastricht University, Limburg, Netherlands, 3 UMC Utrecht, Utrecht, Netherlands

Multi-slice excitation schemes are based upon the superposition of single-band RF waveforms. Through inter-slice phase relaxation, it is possible to minimize the constructive interference and thus to obtain lower peak amplitude RF pulses. We cast the problem as a linear objective function with quadratic equality and inequality constraints. This can be solved very quickly. The achieved peak power is lower than the existing phase relaxation method and control of RF peak power over the whole CAIPIRINHA excitation scheme and/or a whole pTx system with channel/slice dependent amplitude/phase shimming settings is obtained.

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