A 64-detector row CT scanner (OPTIMA CT660PRO; GE Healthcare, Chicago, IL, USA) was used for CT analysis. Protocol CT parameters were as follows: section thickness, 0.625 mm; pitch, 0.984; construction interval, 0.625 mm; noise index, 9.8 (at 5-mm thickness); 120 kV; and tube rotation time, 0.7 s. A total of 60 mg I per kg of non-ionic contrast material was administered intravenously over a period of 30 s, using a power injector (Stellant CT Injection System Stellant D Dural Flow; Bayer Medical Care, Pittsburgh, PA, USA). Imaging was performed at 25 and 85 s after the initiation of contrast material injection, corresponding to the arterial and late phases, respectively.
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