Table 1.
Summary of the results
| Experiment 1 (TR = 5 to 10 ms) | Experiment 2 (TR = 5 ms) | |||||
|---|---|---|---|---|---|---|
| Least-squares Shim method | Min-max Shim method | Least-squares shim method | Modified min-max shim | |||
| Off-resonance (Hz) | TRa,b (ms) | Off-resonance (Hz) | TRa,b (ms) | cOff-resonance (Hz) | cOff-resonance (Hz) | |
| 1 | −42.0 to 49.7 | 8(< 5) | −39.5 to 36.4 | 9(< 5) | −62.4 to 113.2 | −86.8 to 76.5 |
| 2 | −45.2 to 58.5 | 6(< 5) | −48.4 to 48.6 | 7(5) | −48.2 to 135.7 | −81.1 to 79.1 |
| 3 | −42.7 to 78.0 | 5(5) | −43.6 to 43.7 | 8(6) | −62.9 to 112.0 | −76.0 to 76.0d |
| 4 | −33.6 to 54.5 | 7(7) | −36.6 to 36.2 | 10(9) | −51.8 to 127.8 | −83.7 to 78.2 |
| 5 | −45.7 to 62.7 | 7(< 5) | −50.1 to 52.3 | 9(6) | −53.2 to 115.1 | −81.1 to 77.4 |
a
The maximum TR that showed no significant banding artifact in the bSSFP imaging.
b
The number in the parenthesis represents a TR that shows no discernable banding artifact even at the edges of the images.
c
Off-resonance frequency ranges are based on the ROI after removing excessive off-resonant voxels by the modified min-max shim method.
d
The off-resonance frequency range was calculated from the field map.