Ultra-high field MRI with parallel transmit offers significant advantages but B1 transmit maps must be acquired to utilize its full potential. We designed and evaluated three new adaptations to a pre-saturation TurboFLASH B1+ mapping method. The proposed methods enabled significantly shorter TRs (on the order of 1 s), were insensitive to T1, and had comparable accuracy to the original method whilst maintaining the other desirable characteristics of the sequence. The method was shown to work in 3D allowing for volumetric B1+ maps to be acquired in 18 seconds.
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