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 [%]
8.0
6.3
7.0
17.0
14.0
12.0
a 1/a 2
1.0
0.82
0.40
0.58
0.60
Δθ
90°
1.7°
−12°
2°
−22°