Fast low-SAR B0-mapping along projections at high field using two-dimensional RF pulses

At 7T, conventional static field (B0) projection mapping techniques (FASTMAP, FASTESTMAP) suffer from elevated SAR and force long acquisition times (TA). Here the series of adiabatic pulses needed for pencil selection is replaced by a single 2D-RF pulse in the small tip angle regime. After in-vivo characterization of the selection profile, results (N=7, 6 VOIs) show no significant difference between the water spectral linewidths obtained with the conventional adiabatic (TA = 4 min) and the optimized 2D-RF FASTMAP sequence (TA = 42 s). In addition, SAR is reduced by two orders of magnitude without impact on shimming or spectrum quality.

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