延迟时间及扫描时间对320排螺旋CT下肢静脉血管直接造影成像图像质量的影响  

Effect of Delay Time and Scanning Time on the Quality of Direct Lower Extremity Venography by 320-Row Spiral CT

作　　者：曹宏伟[1] 程艳芬[1] 王胜林[1] 万立野[1] 崔志新[1] 马飞龙[1] 邢千超 CAO Hongwei;CHENG Yanfen;WANG Shenglin(The Affiliated Hospital of Chengde Medical University,Hebei Chengde 067000,China)

机构地区：[1]承德医学院附属医院放射科,河北承德067000

出　　处：《河北医学》2022年第1期155-159,共5页Hebei Medicine

基　　金：河北省承德市科学技术研究与发展计划项目,(编号:201801A036)。

摘　　要：目的:评估不同CT延迟时间及扫描时间前提下320排螺旋CT下肢静脉直接法血管造影成像的图像质量,优化CT机器扫描计划,获取最佳成像参数。方法:采用东芝320排螺旋CT对疑诊下腔静脉或下肢静脉疾病的60例患者进行直接法下肢静脉血管造影,随机分成3组。相同液体量(200mL)、造影剂浓度(1∶7~1∶9)、注射速率3.0mL/s条件下,A组延迟时间50s、扫描时间10~20s。B组延迟时间30s、扫描时间20~30s。C组延迟时间20s扫描时间30~40s。所有图像传至后处理工作站进行VR及MIP重建,按照4个等级评估下肢静脉图像质量,并进行统计学分析。结果:各实验组图像质量不全相同,B组与C组间无明显统计学差异且图像质量均为良或优,A组与B、C组间有明显统计学差异且图像质量主要为良及可。结论:相同液体量(200mL)、造影剂浓度(1∶7~1∶9)、注射速率3.0mL/s条件下,320排螺旋CT下肢静脉直接法血管造影,采用延迟时间30s,扫描时间20~30s可以获得满足临床诊断需求的图像。Objective:To evaluate the image quality of direct lower extremity venography by 320-row spiral CT under different CT delay time and scanning time,optimize CT machine scanning plan and obtain the best imaging parameters.Methods:60 patients with suspected inferior vena cava or lower extremity venous diseases were performed direct CT venography of lower extremity with Toshiba 320-row spiral CT.Under the same liquid volume(200ml),contrast medium concentration(1∶7~1∶9)and injection rate of 3.0ml/s,the delay time and scanning time of group A were 50s and 10~20s respectively.In group B,the delay time was 30s and the scanning time was 20~30s.In group C,the delay time was 20 s and the scanning time was 30~40 s.All the images were sent to the post-processing workstation for VR and MIP reconstruction.The image quality of lower extremity venography was evaluated according to four grades and analyzed statistically.Results:The image quality of each experimental group was not the same.There was no significant difference between group B and group C,and the image quality was good or excellent.There was significant difference between group A and groups B and C,and the image quality was mainly good and fair.Conclusion:Under the condition of the same liquid volume(200ml),contrast medium concentration(1∶7~1∶9)and injection rate of 3.0ml/s,320-Row spiral CT direct lower extremity venography can be used to obtain images satisfying clinical diagnostic needs by using delay time 50s and scanning time 20~30s.

关 键 词：CT 下肢静脉 延迟时间 扫描时间 

分 类 号：R816.2[医药卫生—放射医学] R543.6[医药卫生—临床医学]