Single-shot, B1-insensitive slice selection with a gradient-modulated adiabatic pulse, BISS-8.
An adiabatic pulse has been developed to accomplish uniform slice-selective excitation with a spatially inhomogeneous B1. This new pulse can generate a uniform, arbitrary flip angle that is determined by four adjustable phase shifts in the pulse. Self-refocused slice selection is achieved by modulating a B(O) gradient in concert with the pulse frequency (or phase) modulation. B1-compensated, self-refocused slice selection is demonstrated in computer simulations and phantom experiments using a surface transmitter/receiver coil. This adiabatic pulse can provide optimal performance in multislice MRI and localized spectroscopy when transmitting with an inhomogeneous B1.
de Graaf
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RA
Bijvoet Center for Biomolecular Research, Utrecht University, The Netherlands.
Nicolay
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K
Garwood
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D003198:Computer Simulation; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D019047:Phantoms, Imaging