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.