Abstract #1892

Reduced peak power in paired excitation and refocusing multiband pulses by quadratic phase modulation in the spatial domain

David G Norris^1,2 and Jenni Schulz¹

¹Donders Institute for Brain Cognition and Behaviour, Radboud University Nijmegen, Nijmegen, Netherlands, ²Erwin L Hahn Institute, University Duisburg Essen, Essen, Germany

This abstract describes the use of pulses that have a quadratic phase profile in the spatial dimension for simultaneous multi-slice imaging. The quadratic profile reduces the peak voltage needed by an amount dependent on the number of simultaneously excited slices. The pulses have to be used as an excitation-refocusing pair, with the refocusing pulse having half the phase gradient. The echoes from each slice are simultaneously refocused and there are no additional constraints on the pulse duration.

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