Saturated double-angle method for rapid B1 mapping
Nayak K, Pauly J, Cunningham C
University of Southern California
For MRI at high field it is essential to consider the homogeneity of the active B1 field, particularly if surface coils are used for RF transmission. A new method is presented for rapid B1+ magnitude mapping. It combines a double angle method with a B1-insensitive magnetization-reset sequence such that the choice of TR is independent of T1. A multi-slice spiral acquisition gives volumetric coverage in a few seconds. By comparing maps made with different TRs and observing no difference except variations in SNR, it can be concluded that the proposed sequence achieved the desired removal of T1 effects.