Very Fast Multi Channel B1 Calibration at High Field in the Small Flip Angle Regime

Pierre-Francois Van de Moortele¹, Kamil Ugurbil¹

We describe a fast method to estimate transmit B1 profiles in multi channel transceiver arrays in the small flip angle regime within about 1 minute of data acquisition. Despite of expected residual biases, it was possible to obtain excellent B1 Shim results based on these estimated B1 maps. Further investigation will help determining if this fast B1 estimation, which can cover the whole brain in less than 3 minutes with 40 slices, could become part of common scanner calibration routines, such as B0 mapping, for integrating transmit B1 adjustment in standard MR sesions at high field.