Figure 3.

Representative B1 maps obtained with basic-double-angle method and T1c- double-angle method. (a) Used flip angle pair were 20 and 40°, (b) used flip angle pair were 45 and 90°. High flip angle pair, large number of shots and long repetition time improve map quality. In the image (b), it can be seen that flip angle tends to be higher on the surface of the phantom and lower in the center, similar to basic- double-angle method, if the appropriate parameters are chosen