Effect of Low Refocusing Angle in T1-Weighted Spin Echo and Fast Spin Echo MRI on Low-Contrast Detectability: A Comparative Phantom Study at 1.5 and 3 Tesla
Table 1
ROI-based disc contrasts at 1.5 and 3 T for SE and FSE T1 sequences containing only NiCl2 solution relative to background containing both plastic sheet and NiCl2 solution.
Single slice SE T1 (a.u.)
Multislice SE T1 (a.u.)
Single slice FSE T1 (a.u.)
Multislice FSE T1 (a.u.)
NiCl2 filled ACR phantom at
Disc/BkGd relative CNR using 180° refocusing pulse
3.8
3.8
3.2
3.1
Disc/BkGd relative CNR using 120° refocusing pulse
1.8
2.0
1.7
2.2
NiCl2 filled ACR phantom at
Disc/BkGd relative CNR using 180° refocusing pulse
3.8
3.7
3.8
4.1
Disc/BkGd relative CNR using 120° refocusing pulse
