Multiple locations inside the volume of interest can be mapped to same frequency by applying spatially oscilating magnetic fields (SOMFs) created by 9 channel z-gradient array. Such a mapping can lead to excitation of multiple slices or slabs with a single band RF pulse as well as doubling the number of slices excited by a multi-band RF pulse. Depending on the slice or slab locations, spatially oscillating magnetic fields can be shifted using a independent gradient amplifiers. We have demonstrated 2 slab excitation with a single band RF pulse and 6 slice excitation with a 3-band RF pulse.
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