Optimization of parallel RF transmission enabled by concurrent recording of RF and gradient fields

Advanced schemes of parallel excitation are based on the exact knowledge of the magnetic field dynamics inside the MR scanner and require highly accurate interplay between several RF channels and gradient waveforms. Further the transmit channels need to be highly synchronized and timed among themselves as well as with the gradient system. We present an optimization framework for spatially selective and sparse-spokes pulse design in parallel RF transmission at 7T based on magnetic field monitoring to measure the temporal evolution of gradient magnetic fields and the multi-channel RF excitation pulses on equal time basis, fully concurrently and at full power.

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