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Abstract #0366

3D B1 Mapping for Short T2* Spins Using Radial Gradient Echo with Gradient Offset Independent Adiabaticity

Naoharu Kobayashi1, Michael Garwood

1Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, MN, United States

Obtaining the B1 map is necessary for a number of MRI methods, including T1 measurement. We introduce a new approach to actual flip angle imaging (AFI) that achieves 3D B1 mapping even when T2* is short. The approach utilizes COncurrent Dephasing and Excitation (CODE) with Gradient Offset Independent Adiabaticity (GOIA). CODE is a short TE radial GRE sequence that is relatively robust compared to some other ultra-short TE sequences. The use of GOIA pulses in CODE significantly reduces the peak power and SAR.