Ge workstation

MRV examination was performed using a 3.0 T MR scanner (Discovery 750, GE Healthcare, WI, USA) with a standard 8-channel phased-array head coil. The acquisition parameters of three-dimensional-phase contrast MRV were as follows: repetition time = 14.2 ms, echo time = 4.07 ms, field of view = 220 × 220 mm, slice thickness = 1.6 mm, gap = 0.8 mm, matrix size = 512 × 512, flip angle = 8, and frequency direction = anterior/posterior. Raw data were postprocessed on a GE Workstation (version 4.7) (GE Healthcare; Cytiva).

¹⁸F-FDG PET/CT examination were completed within one month before EC radical surgery in this retrospective study. To prepare for the examination, all of the patients fasted for more than 6 hours. The patient's blood glucose level was measured to ensure the patient's blood glucose level was within 3.9–7.0 mmol/L prior to intravenous injection of ¹⁸F-FDG (0.1–0.12 MBq/kg body weight, about 185–370 MBq). Following intravenous injection of ¹⁸F-FDG, the patient stayed in a quiet environment for about 50 minutes to allow biodistribution of the radiotracer. PET acquisition was performed from top of the head to mid-thigh, using a PET/CT scanner (Discovery Elite; GE healthcare, Chicago, IL, USA). The patients took a supine position with head slightly reclined for PET acquisition. According to the height of the patient, the patients were scanned at 7–9 beds, for 2 minutes per bed position. PET Images were reconstructed and stored in axial, coronal, and sagittal slices 3.75 mm thick using a GE workstation (advantaGE workstation 4.6 releases).

Two additional general radiologists, with seven and three years of experience in musculoskeletal MRI imaging, reviewed the images in consensus for signal intensities.
The readout was performed on a GE-workstation (General Electric, Milwaukee, Wisconsin, USA) for two anatomical regions: 1) meniscus was analysed separately; and 2) the rest of the articular joint space including all ligaments (cruciate, collateral, patellar, and femoropatellar ligaments), synovia, capsule, and periarticular soft tissue.
All readers were blinded to the diagnosis and had to score the signal intensity on T1, proton density (PD), and SWI sequences for both anatomical regions separately. T1 and PD hyperintensity and SWI hypointensity in both regions were recorded and equalled positivity for haemorrhage. Any signal change (hyper- or hypointense) in any sequence was classified as positivity for any pathology (see Statistics below).