Data Acquisition of MRI

All preoperative MRIs were performed on a 3.0 T MRI scanner (Discovery, GE Healthcare, Milwaukee, WI, USA) with an eight-channel head coil. 1) The conventional MRI scan sequence included the following: a T1-weighted sequence (T1): TR1750 ms, TE24 ms, TI780 ms; a T2-weighted sequence (T2): TR6240 ms, TE94 ms; a liquid attenuated inversion recovery T2 sequence (FLAIR): TR8400 ms, TE150 ms matrix 288×224, FOV 240×240 mm, layer spacing 1 mm, layer thickness 4 mm, 24 scanned layers; 2) A TIWI-enhanced MRI sequence (T1C): a cross-sectional T1WI sequence was scanned after injection of the contrast agent gadodiamide (GE Pharmaceuticals) at 0.2 mL/kg, with the same parameters as the flat-scan TIWI sequence.