Lowering the B 1 Threshold for BEAR B 1 Mapping

We redesign the BEAR B ₁ mapping method to use HSn pulses, which have lower adiabatic thresholds. By optimizing the HSn pulse parameters, we can reliably acquire B ₁ maps for lower nominal peak B ₁ than with the original BEAR method. We validate the performance of BEAR with HSn pulses via simulation and in vivo at 3T, with average errors from the original BEAR method of less than 3%. This method will be useful for reliably acquiring B ₁ maps for lower B ₁ values.

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