Fig. 6

Anaplastic oligodendroglioma, WHO Grade III, 49-year-old male, relapsed after surgery in 2014. (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. For lesions with low-level blood‒brain barrier (BBB) leakage (green circle), the enhancement effect was similar between 3.0 T and 5.0 T, but for lesions with high-level BBB leakage (red circle), the enhancement effect with a half-dose at 5.0 T was significantly better than that with a full-dose at 3.0 T