Fig. 1.

The TIAMO flip angle maps corresponding to the two individual B₁⁺ shim settings (a and b) and the combined root sum of squares (RSS) flip angle map (c) in patient 5 (male, 64 years old, rectal cancer). The white box in c indicates the ROI in which the flip angle distribution was evaluated. The two complementary shim settings produced a RSS homogenous flip angle distribution over a large FOV (water-selective GRE overview image example in d and e) (see also Table 2). A single axial slice (a–c) was used for B₁⁺ shimming (indicated by dashed line in coronal image d). The corresponding axial overview GRE image is depicted in e