8 channel body coil

Images were collected for all patients using a 1.5 T MR scanner (Avanto, Siemens) equipped with an 8-channel body coil. The scanning area ranged from the anteroom-superior iliac spine to the symphysis pubis. The scanning sequence included the coronal, sagittal, and axial oblique fat-saturation (fs) T2WI; axial oblique DWI and axial oblique three-dimensional volumetric interpolated breath-hold examination (3D-VIBE). DWI was acquired by echo-planar imaging (b-value = 0, 800 s/mm²). After DWI scanning, the workstation automatically calculates and generates ADC map. The specific MRI parameters are shown in Table 1. When 3D-VIBE sequence was used to obtain DCEI, patients were instructed to hold their breath at the end of expiratory breath. A high pressure syringe (Spectris MR injection system, Medrad Inc.) was used to administer gadolinium diethylenetriamine penta-acetic acid (Bayer Healthcare Pharmaceuticals) through the cubital vein at a rate of 2 mL/s. The dosage of Gd-DTPA was 0.1 mmol/kg. Images of arterial phase, venous phase and delay phase were obtained by scanning at 25 s, 60 s and 180 s after administration.