From: Iterative multi-channel radio frequency pulse calibration with improving B1 field uniformity in high field MRI
Axial slice
Coronal slice
Quadrature excitation
RF pulse calibration
B 1 shimming
η [%]
27.4
13.5
13.1
18.0
8.0
7.9
a 1/a 2
1.0
2.0
2.3
1.9
1.8
Δθ
90°
−50°
−40°
−2°
−4°