Optimal control pulse design as a low power alternative to BIR4 excitation pulses
Vencel Somai1,2, Alan J Wright1, Ming Li Chia1, and Kevin M Brindle1,3
1CRUK CI, University of Cambridge, Cambridge, United Kingdom, 2Department of Radiology, University Of Cambridge, Cambridge, United Kingdom, 3Department of Biochemistry, University of Cambridge, Cambridge, United Kingdom
The BIR4 pulse achieves adiabatic excitation over a moderate frequency range but has a relatively high adiabatic threshold, which is demanding on the hardware and deposits significant energy when the repetition rate is high. We show here using simulations and an experiment in vivo that optimal control can provide a better alternative with a significantly lowered adiabatic threshold.
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