MRI examinations were performed on a 3.0 T MRI scanner (GE Medical Systems, Milwaukee WI, USA) with a gradient field of 40 mT/m, a gradient switching rate of 150 T/m/s, and an eight-channel head coil. Images were analyzed using a Sun graphics workstation (Sun Microsystems Inc., Menlo Park, CA, USA) and Advantage™ for Windows version 4.2 software (TA Instruments, New Castle, DE, USA). The following SWI sequence parameters were used: T2-weighted imaging (T2WI; repetition time (TR)/echo time (TE) = 5000 ms/113.7 ms), slice thickness = 6 mm, interval = 1 mm, flip angle = 90°, field-of-view (FOV) = 24 cm × 24 cm, number of excitations (NEX) = 1. Phase images were acquired using a three-dimensional flow-compensated gradient-echo sequence, with a total of 56 slices: slice thickness = 2 mm, TR = 32 ms, TE = 19 ms, flip angle = 20°, FOV = 24 × 24 cm, matrix 448 × 384, NEX = 0.75.

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