680292.fig.002a
(a)
680292.fig.002b
(b)
680292.fig.002c
(c)
680292.fig.002d
(d)
680292.fig.002e
(e)
680292.fig.002f
(f)
680292.fig.002g
(g)
680292.fig.002h
(h)
Figure 2: Spin echo (SE) and fast spin echo (FSE) images at 1.5 T (a)–(d) and at 3 T (e)–(h). (a) SE (CNR 3.8 for 180° refocusing), (b) SE (CNR 1.8 for 120° refocusing), (c) FSE (CNR 3.2 for 180° refocusing), (d) FSE (CNR 1.7 for 120° refocusing), (e) SE (CNR 3.8 for 180° refocusing), (f) SE (CNR 1.0 for 120° refocusing), (g) FSE (CNR 3.8 for 180° refocusing), and (h) FSE (CNR 1.1 for 120° refocusing); Note that 180° refocusing pulses produce 2–4 times the CNR present at 120° depending on the main magnetic field. Also, overall signal at 3 T is higher than that at 1.5 T.