多排螺旋CT小剂量预扫描门静脉血管成像的临床应用

The Clinical Application of Small Dose Prescan in Portal Vein Imaging with Multislice Computed Tomography Slice

目的:探讨16排螺旋CT小剂量预扫描门静脉造影的可行性。材料与方法:将100例疑有肝脏疾病进行16排CT门静脉造影的患者分成两组,50例采用常规扫描即注射对比剂后延时25—27s行动脉期扫描,延时45—55s行门脉期扫描,延时80—120s行肝实质期扫描。造影剂浓度370mg/ml,剂量为2ml/kg,注射速率3.5ml/s。50例采用小剂量预扫描即检查均行小剂量预扫描,预扫描造影剂的用量为20ml,注射速率为3.5ml/s。扫描采用轴扫,扫描层厚为5mm,层间距为0mm,时间间隔为2s,扫描层数为8—10层,延时时间为30—35s。获取门静脉时间浓度曲线。确定门静脉扫描的延时时间来进行门脉血管造影。运用容积重建法(VR)、多层面重建法(MPR)和最大密度投影法(MIP)对门静脉及其分支进行重建,评价门静脉成像的效果。成像效果由两位高年资的医生进行评估。结果:采用小剂量预扫描方法的门静脉成像比常规扫描门脉成像成功率高,显示血管细小分支级别高。结论:门静脉小剂量预扫描的方法能大大提高门静脉成像的成功率和较高的门脉成像满意度。具有很好的临床应用价值。

Objective： To explore the clinical feasibility of prescan multislice computed tomography slice in small dose portal vein imaging. Methods： 100 cases of liver disease were suspected were randomly divided into two groups; in control group, all 50 cases were preformed in conventional portal vein scanning method; in experimental group, those patients were preformed in small dose portal vein blood vessel imaging first, then preformed portal vein scanning, based on portal vein time- contrast medium strength curve which got from in small dose portal vein scanning; all CT source material were analyzed with volume method （VR）, multi-planer reconstruction （MPR） and maximum density projection （MIP）. Results： The small doses of portal vein imaging can enhance the success rate of portal vein; minute blood vessel of portal can show more clearly. Conclusion： Small dose prescan portal vein imagin~ can ~reatlv imorove the success rata of nartnl vain wh;,~h ; ~h .~ ,.I;~_