T1 sequence was obtained as a 3D volume in the coronal plane using a FLASH sequence with the following parameters: TE=6 ms, TR=20 ms, flip angle=30°, FOV=260×260×192 mm, matrix = 256×256×124, NEX=2, slice thickness 3 mm, ETL=5. The MR6 T2 images were acquired using a 2D fast spin-echo sequence in the coronal plane. The parameters were: TE=85 ms, TR=4800 ms, slice thickness/gap=1.8/0.0 mm, FOV=160×160 mm, matrix=256×256, NEX=3, number of echoes=8, number of slices=124.