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Abstract #1883

Optimized amplitude modulated multiband RF pulses

Samy Abo Seada1, Joseph V Hajnal1, and Shaihan J Malik1

1Division of Imaging Sciences and Biomedical Engineering, King's College London, London, United Kingdom

Simultaneous multi-slice imaging can accelerate image acquisition for commonly used diffusion and functional MRI sequences. The design of multiband pulses can be problematic due to their high peak amplitude. Another issue is that the necessary rapid phase and amplitude modulation can be problematic for some current MRI RF systems to reproduce. Phase related issues can be avoided by designing purely amplitude modulated waveforms. We describe how three current multiband pulse design techniques (phase optimisation, time shifting and root-flipping) can be modified to produce purely amplitude modulated pulses and find that the relative peak increase is only about 20-25%.

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