胰腺CT增强扫描参数研究.pdf

南京医科大学硕士学位论文胰腺CT增强扫描参数研究姓名:徐青申请学位级别:硕士专业:影像医学指导教师:黄庆娟 南京医科大学硕士学位论文胰腺CT增强扫描参数研究中文摘要目的、研究不同的扫描参数对胰腺CT增强的影响,以得出合适的扫描方案。材料与方法①预试验20例,()、3ml/s速度注射造影剂(Omnipaque 300mgI/m1) 行胰腺薄层三期扫描,动脉期、胰腺期及门脉期的延迟时间分别为 15~18s,40s,70s,分别测量胰腺平均CT增强值并作比较。②将 50例患者按不同剂量和注射速度随机分成五组,I组(、3 ml/s),II组( ml/kg、),111组(1 ml/kg、3ml/s),Ⅳ组(1 ml/kg、),V组(固定剂量75 ml、)。每组各10 例,分别行胰腺薄层双期扫描,胰腺期和f1脉期的延迟时间为40s, 70s。分别测量胰腺平均cT增强值并作比较。{/结果预试验中发现胰腺平均CT增强值,胰腺期(± Hu)比动脉期( ±)高(P<),胰腺期(± Hu)比门脉期( ±)高(P<)。50例对照研究中,胰腺期胰腺平均CT 增强值,I组为(±),Ⅱ组为(± Hu),Ⅲ组为(±),Ⅳ组为(±),V组为( ±)。I与Ⅲ组相比(P<),Ⅱ与Ⅳ组相比(P<), Ⅱ与V组相比(P<)。I与Ⅱ,Ⅲ与Ⅳ,Ⅳ与V组相比无明显差异J结论平均胰腺实质增强胰腺期比动脉期、门脉期好,高剂量可提高胰腺增强效果,, ml/s~3ml/s注射速度是比较合适的扫描参数。, 忉曩∥,,’关键词胰腺增强、断层摄影术渗数南京医科大学硕士学位论文 Study ofScanning Parameters on Pancreas CT Enhancement Abstract objective To assess the effects ofdifferentscanning parameters on pancreatic enhancement CT and tofind an appropriate protocols for examining the pancreas. Materials and Methods patients were injected by of contrast material(Omnipaque 300 mgI/m1)and theinjection ratewas 3ml/ were obtained in arterialphase,pancreatic phase andportal venous phase,delay 15—18s, 40s and70s, CT enhancement values ofpancreas were measured for three phases. patients were randomly divided into fivegroups withdifferentinjection I( mYkg,3 mYs),Group lI(, ml/s), GroupⅢ(1 ml/kg,3ml/s),Group1V(1 ml/kg,)and Group V(fixed dose75ml,),each group has were obtained in pancreatic phase and portal venous phase,delay 40s, CT enhancement values of pancreas were obtained for five groups. Results In thepre—test,mean pancremic enhancement value was significantly greater inthepancreaticphase(±)than both inarterialphase(±)(p<)and portal venous phase (