Fig. 4

Atypical meningioma, WHO Grade II, 35-year-old male. (a1) T1w MRI without contrast enhancement at 3.0 T and (b1) T1w MRI without contrast enhancement at 5.0 T. (a2) and (a3) Two different slices of full-dose enhanced T1w MRI at 3.0 T. (b2) and (b3) Two different slices of half-dose enhanced T1w MRI at 5.0 T. A 5.0 T MRI displayed a clearer boundary and internal structure of the lesion and showed a stronger inhibitory effect than did 3.0 T MRI; at the same time, in the half-dose 5.0 T images, the degree and range of edge enhancement in the lesion were stronger than those in the full-dose 3.0 T images