分次团注结合虚拟平扫技术在泌尿系统CT造影成像中的价值  

The Value of Split-bolus 2-phase with Virtual Non-enhanced Scan in CT Urography

作　　者：帅桃[1] 李真林[1] 邓莉萍[1] 袁元[1] 潘雪琳[1] 程巍[1] 李万江[1] 

机构地区：[1]四川大学华西医院放射科,成都610041

出　　处：《四川大学学报（医学版）》2012年第4期588-591,596,共5页Journal of Sichuan University(Medical Sciences)

基　　金：四川省科技支撑计划项目(No.2010FZ0017)资助

摘　　要：目的探讨分次团注对比剂结合虚拟平扫技术在CT泌尿系统成像(CTU)中的价值。方法选择因泌尿系统梗阻性疾病在我院行双源CT增强扫描的患者80例,随机平均分为A、B两组。A组行传统CTU扫描技术,采用单源扫描,扫描序列设定为先行常规平扫,再注射碘对比剂100mL,行动脉期增强扫描、实质期增强扫描和排泄延迟期扫描,扫描参数为管电压120kV,管电流210mAs。B组行分次团注与虚拟平扫相结合的改良CTU扫描技术,扫描序列设定为常规平扫后注射碘对比剂40mL,延迟15～30min后,再次注射碘对比剂60mL,行动脉期和实质期增强扫描,其中实质期增强扫描采用双能量扫描序列,扫描参数为A管管电压140kV,管电流68mAs,B管管电压80kV,管电流374mAs。比较两种方法扫描下的集合系统图像质量和辐射剂量,比较虚拟平扫与常规普通扫描对于泌尿系统病变的检出情况,比较双能量增强扫描与常规普通增强扫描的辐射剂量。结果两种成像方法下集合系统的图像质量差异无统计学意义(P>0.05),但A组辐射剂量明显高于B组(P<0.05),分次团注结合虚拟平扫技术辐射剂量仅为传统CTU扫描技术的55%。虚拟平扫与常规普通扫描对泌尿系统疾病的显示例数差异无统计学意义(P>0.05)。双能量扫描与常规增强扫描的辐射剂量差异无统计学意义(P>0.05)。结论采用分次团注与虚拟平扫技术相结合的方法,不仅能获得与传统CTU扫描相同的图像质量,同时减少了约一半的辐射剂量。Objective To investigate the value of split-bolus 2-phase with virtual non-enhanced scan in CT urography.Methods Eighty（80） patients with urinary obstruction were divided into two groups,group A was traditional CT urography scan,group B was split-bolus 2-phase with virtual non-enhanced scan.The scan sequence of group A included conventional scan first,then enhanced scan in arterial phase,parenchyma phase and excretion delayed phase after the injection of 100 mL contrast agent.The scan sequence of group B included conventional scan and enhanced scan following two bolus injection of contrast;the first injection of contrast was 40 mL,the second injection was 60 mL with 15-30 minutes delay,then enhanced scan was conducted in arterial and parenchymal phase,the parenchymal phase scan was performed with dual energy scanning sequence.The image quality of urinary collecting system,the detection of urinary obstructive lesion,and radiation dose were compared between the two groups.Results Between the two imaging methods,the imaging quality of urinary system did not show significant difference,but radiation dose was statistically significant difference.The radiation dose of split-bolus 2-phase with virtual non-enhanced scan was only 55% of traditional CTU scan.Conclusion Split-bolus2 phase with virtual non-enhanced scan could obtain the same image quality as tranditional CTU,while reducing the approximately half the radiation dose.

关 键 词：虚拟平扫 分次团注 辐射剂量 CT泌尿系统成像 

分 类 号：R816.7[医药卫生—放射医学]