对比剂注射流率对双源CT上腹部虚拟平扫图像质量的影响  

Influence of Injection Rate of Contrast Medium on Image Quality of Dual Energy Virtual Non-constrast CT of Epigastrium Using Dual Source CT Scanner:A Preliminary Study

作　　者：彭晋[1] 张龙江[1] 周长圣[1] 赵艳娥[1] 蔡军[1] 马延[1] 朱正庭[1] 卢光明[1] 

机构地区：[1]南京军区南京总医院医学影像科,南京210002

出　　处：《放射学实践》2010年第2期215-218,共4页Radiologic Practice

摘　　要：目的:比较对比剂注射流率对双源CT上腹部虚拟平扫图像质量的影响。方法:2009年2～5月60例临床疑似上腹部病变患者行双源CT上腹部常规平扫(CNCT)及动脉期双能量扫描(80kVp/400mA和140kVp/95mA)。随机每组20例分成3组。对比剂注射流率分别为3.0ml/s、4.0ml/s及5.0ml/s。利用LiverVNC软件处理得到动脉期虚拟平扫数据,比较3组动脉期VNC在图像质量、平均CT值、信噪比、辐射剂量及病灶检出上差异是否有显著性意义。结果:三组虚拟平扫所测肝脏、腹主动脉平均CT值的差异均无显著性意义(P>0.05);3.0ml/s、4.0ml/s组所测脾脏平均CT值差异无显著性意义(P>0.05),5.0ml/s组差异有显著性意义(P≤0.05);三组虚拟平扫之间信噪比差异无显著性意义(P>0.05);虚拟平扫的图像质量较常规平扫有下降,但可满足临床诊断需求,三组虚拟平扫图像质量评分的差异无显著性意义(P=0.07);三组虚拟平扫和常规扫描病灶检出性能相似。结论:尽管注射流率对动脉期虚拟平扫的图像质量差异无显著性意义,但3ml/s组图像质量有更好的趋势,推荐在临床使用。Objective：To investigate the effect of injection rate of contrast medium on image quality of dual-energy virtual non contrast CT （VNCT） of epigastrium using dual source CT. Methods： From February to May 2009,60 patients who were suspected of having intrahepatie lesions in our hospital were referred to undergo abdominal CT scan：conventional （CNCT） and arterial phase enhanced scanning with dual-energy mode （80kVp/400mA and 140kVp/95mA）. The patients were classified into three groups （3ml/s, 4ml/s, and 5ml/s） according to injection rate. The dedicated software of Liver VNC was used to reformat VNCT images. Image quality,radiation dose,the average CT value,signal to noise ratio,and lesion detectability of 3 groups were compared. Results：There was no statistical significance among three groups for CT numbers of the liver and abdominal aorta for VNCT images among three groups （P〉0.05）. No statistical significance for CT numbers of spleen was found between groups 3ml/s and 4ml/s, while statistical significance was present for group 5ml/s （P≤0.05）. There was no statistical significance for SNR among three groups （P〉0.05）. Image quality of VNCT was lower but more practical for diagnosis than CNCT （P〉 0. 05）, there was no statistical significance for three VNCT images （P=0.07）. VNCT images of the three groups had similar performance to that of CNCT in the detection of lesions. Conclusions： Injection rate of 3ml/s is recommended to be used in the clinical setting, though having no statistical significance but possessing the tendency of increasing image quality.

关 键 词：体层摄影术 X线计算机 辐射剂量 图像处理 计算机辅助 

分 类 号：R816.5[医药卫生—放射医学]