256层螺旋CT灌注扫描在肝门静脉成像中的应用研究  

Study on the Imaging of Hepatic Portal Vein Using 256-slice Spiral CT Perfusion Technique

作　　者：杨帆[1] 田新立[1] 肖正远[1] 

机构地区：[1]泸州医学院附属医院,四川泸州646000

出　　处：《中国医学创新》2015年第3期53-56,共4页Medical Innovation of China

摘　　要：目的：探讨256层CT扫描在门静脉成像的最佳时间点及分布区间,寻找门静脉成像的最佳方法。方法：对30例患者采用256层CT行上腹部灌注扫描,于注射造影剂5 s后行连续动态扫描,曝光时间间隔为3 s,观察门静脉成像全过程,选择最佳时相分布区间。以此为参考,在该区间设定多个定时曝光时间点,再对57例患者进行上腹部灌注扫描,于注射造影剂后延迟25 s间隔扫描,间隔时间为5 s,曝光4次,时间点为25、30、35、40 s。从四组门脉期图像中选取最佳时相进行门脉系统CTV图像重组。测量门静脉、肝脏CT值,并计算CT差值,评估门静脉成像质量。并分析门静脉最佳时间点的分布与受试者心率、体重及身高之间的相关性。结果：注射对比剂后25-40s多时相点定时扫描,对包括95%的患者行门静脉最佳时相成像,门脉最佳时间点的分布与患者心率分布呈相关性（P〈0.05）,与患者身高、体重分布无相关性（P〉0.05）。结论：256层螺旋CT多时相点定时扫描,是门静脉成像的可靠方案。Objective：To explore the best time point and the distribution range of the imaging of hepatic portal vein using 256-slice spiral CT perfusion technique,to find the best way in the hepatic portal vein scanning.Method：30 patients underwent upper abdominal scanning by 256-slice Spiral CT in the first. Done the continuous dynamic scanning delaying 5 s after injection of contrast agents,then observe the whole process of the hepatic portal imaging to get the best distribution range of exposure time. According to this distribution range to set exposure points, then 57 patients underwent upper abdominal scanning. Interval scanning were done delaying 25 s after injection of contrast agents, and the interval of exposure time was 5 s, then taken four times exposures, the time points were 25, 30, 35, 40 s. Elected the best phase from the four groups of hepatic portal vein imaging to reconstruct CTV. The CT value of hepatic, liver and calculated D-value to assess the quality of images were measured. the correlation between the best time point distribution of portal vein and heart rate, weight, height of subjects were analyzed.Result： Best images could be obtained in 95% patients using multitemporal timing scanning delaying 25-40 s after injecting of contrast agents. This result had correlation with patients＇ heart rate（P〈0.05）,but had no correlation with patients＇ height and weight（P〈0.05）.Conclusion：Multitemporal timing scanning using 256-slice Spiral CT was another reliable method of hepatic portal vein imaging.

关 键 词：体层摄影术 X线计算机 血管成像 门静脉 

分 类 号：R575.2[医药卫生—消化系统] R816.5[医药卫生—内科学]