1. Same section position with spin-echo T1-weighted sequences at 1
Same section position with spin-echo T1-weighted sequences at 1.5T (upper row: TR, 700 ms; TE, 10 ms; section thickness, 5 mm; matrix, 256 × 192; FOV, 220 × 220 mm2; bandwidth, 200 Hz/pixel) and 3T (lower row: same imaging parameters).
Same section position with spin-echo T1-weighted sequences at 1.5T (upper row: TR, 700 ms; TE, 10 ms; section thickness, 5 mm; matrix, 256 × 192; FOV, 220 × 220 mm2; bandwidth, 200 Hz/pixel) and 3T (lower row: same imaging parameters). Flip angles decreasing from left to right 130°, 110°, 90°, 70°, 50°. The lowest flip angle shows the best gray-to-white matter contrast. The effect is stronger at higher field.
Bernd L. Schmitz et al. AJNR Am J Neuroradiol 2005;26:
©2005 by American Society of Neuroradiology