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Table 2 The B 1 uniformity computed from the experimental 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 [%]

8.0

6.3

7.0

17.0

14.0

12.0

a 1/a 2

1.0

0.82

0.40

1.0

0.58

0.60

Δθ

90°

1.7°

−12°

90°

−22°

  1. Three methods, the quadrature excitation, the iterative RF pulse calibration and the B1 shimming, are compared for an axial and a coronal slice.