Mohammad Mehdi Khalighi1, Jason H. Su2, 3, Brian K. Rutt3
1Applied Science Lab, GE Healthcare, Menlo Park, CA, United States; 2Department of Electrical Engineering, Stanford University, Stanford, CA, United States; 3Department of Radiology, Stanford University, Stanford, CA, United States
Adiabatic Bloch-Siegert (ABS) B1+ mapping with spiral readout has been recently introduced as a fast and efficient way of volumetric B1+ mapping with no T1 or T2 dependency. Here we have analyzed the angle-to-noise ratio (ANR) of the ABS method and show phantom and brain ANR maps at 7T. We also compare analytically the phase-based ABS using spiral readout with the magnitude-based DREAM method. Our comparison shows that ABS generates >3 times ANR compared to DREAM for similar scan times.