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Table 1 The B 1 uniformity computed from the simulated flip angle maps and the magnitude ratio and phase difference in excitation

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

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

1.0

1.9

1.8

Δθ

90°

−50°

−40°

90°

−2°

−4°

  1. Three methods, the quadrature excitation, the iterative RF pulse calibration and the B 1 shimming, are compared for an axial and a coronal slice.