Contrast injection was done by using 50 ml nonionic contrast agent(300 mg I/ml),at a flow rate of 3.5 ml/s with a power injector,and 5 seconds delay,and data acquisition lasted for 45 seconds. The scanning images were processed in ADW 4.0 workstation.

• 采用高压注射器注射非离子型碘对比剂50 ml (300 mg I/ml)；流率3.；5 ml/s；延迟5 s；数据采集45 s。