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
UMC Utrecht, Utrecht, Utrecht, Netherlands,
of Psychology and Neuroscience, Maastricht University,
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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