MR imaging acquisitions
BEST
The preoperative MRI examination was performed with 3.0 T MRI scanner (Achieva; Philips Medical Systems, Best, the Netherlands) with 16 channels phased array coil serving as the receiver coil. The MRI protocol included: (1) a respiration-triggered turbo spin-echo (TSE) T2-w fat-suppressed axial imaging; TR = 3000 ms, TE = 70 ms, slice thickness = 5 mm, intersection gap = 1.1 mm, matrix = 320 × 280, and field of view (FOV) = 36 × 36 cm; (2) plain and contrast-enhanced T1-w imaging; T1-w 3D sequence (T1 high-resolution isotropic volume examination, THRIVE) was performed following the intravenous injection of Magnevist (Bayer Healthcare, Germany, 0.1 mmol/kg); TR = 4.1 ms, TE = 1.4 ms, slice thickness = 1 mm, matrix = 252 × 198, and FOV = 36 × 36 cm; 15 s acquisition time for one phase. In this study, only T2-w images were selected for radiomics analysis.