多层螺旋CT主动脉成像技术

目的：研究多层螺旋CT主动脉成像技术的最佳扫描参数,强化延时时间及图像重建方法。方法：对21例行主动脉血管造影患者采用团注追踪法CT增强扫描。速率3.0 ml/s、对比剂1.5～2 ml/kg,经肘静脉团注。当感兴趣区对比剂浓度达到阈值后触发扫描,完成增强数据采集,经图像重建处理,显示主动脉。结果：主动脉对比剂流入峰值时间平均为20 s。按2.5 mm层厚重叠50%进行数据重组,然后行VR、CPR、MIP、SSD图像重建。结论：利用Smartprep软件实时追踪对比剂浓度技术,采用优化的扫描参数、恰当的图像后处理技术,MSCT能清晰地显示主动脉。

Aorta Imaging with Multi-slice Spiral CT

Objective To investigate the optimum scanning parameters for multi-slice spiral CT aorta imaging so as to emphasize the contrast delay time and the method of image reconstruction. Methods 21 cases of patients were scanned with contrast enhancement by the method of bolus tracking. The contrast medicine was injected through elbow vein. Flow speed was 3.0ml/s, and contrast usage was 1.5 to 2ml/kg. Scanning was triggered when the density of the enhancement at ROI arose to a prescribed value. After data acquisition and reconstruction, the aorta was displayed. Results The average time for the influx of contrast in aorta was 20 seconds. Data was reformatted with the thickness of 2.Smm and 50% overlapping. VR, CPR, MIP and SSD images were reconstructed. Conclusion With constant tracking of density by Smartprep software, the optimized scanning parameters and the proper image post-processing techniques, aorta can be clearly displayed.