“双低”技术在320排CT肺动脉成像中的应用  

Application of low-concentration contrast agent and low-dose technology in 320-slice CT pulmonary angiography

作　　者：杜林芝 成满平 牛娟琴 叶建军 郝晓东 杨晓萍 陈纲 杨菊红 李欣怡 强海霞 钱玥 韩月东 DU Lin-zhi;CHENG Man-ping;NIU Juan-qin;YE Jian-jun;HAO Xiao-dong;YANG Xiao-ping;CHEN Gang;YANG Ju-hong;LI Xin-yi;QIANG Hai-xia;QIAN Yue;HAN Yue-dong(Imaging Diagnostic Center,Lanzhou General Hospital,Lanzhou 730050,China)

机构地区：[1]兰州总医院影像诊断科,兰州730050

出　　处：《医疗卫生装备》2018年第1期62-65,共4页Chinese Medical Equipment Journal

摘　　要：目的:通过比较在不同管电压、不同浓度对比剂的条件下肺动脉成像的影像质量以及患者所接受的辐射剂量,探讨"双低"技术肺动脉成像的可行性。方法:将60例临床怀疑肺动脉栓塞的患者分为C、L1、L2 3组,扫描条件:C组为120 k V、350 mg I/ml,L1组为100 k V、350 mg I/ml,L2组为100 k V、270 mg I/ml。3组管电流均为500 m A,对比剂用量、生理盐水用量和流速一致,分别为25 ml、40 ml、4.5 ml/s。应用SPSS 19.0统计学软件,对比分析肺动脉节段、上腔静脉、升主动脉的CT值,肺动脉主干噪声,图像质量以及容积扫描的辐射剂量。结果:各肺动脉主干及其分支显示清晰,满足诊断要求。L1组肺动脉主干及其分支CT值均高于C组,图像噪声大于C组,辐射剂量小于C组,差异均有统计学意义(P<0.01)。L2组肺动脉主干及其分支CT值与C组相当,差异无统计学意义(P>0.05);图像噪声大于C组,辐射剂量小于C组,差异均有统计学意义(P<0.01)。L2组肺动脉主干及其分支CT值均小于L1组,差异有统计学意义(P<0.01);图像噪声、辐射剂量与L1组相当,差异无统计学意义(P>0.05)。结论:低辐射剂量、低浓度对比剂可用于肺动脉CT成像,并且具有明显的优势。Objective To explore the feasibility of low-concentration contrast agent and low-dose technology for pulmonary angiography by comparing the image quality and radiation doses to the patient by different tube voltages and concentrations of contrast agents.Methods Totally 60 patients suspected with pulmonary embolism were divided into C,L1 and L2 groups,of which,Group C had the scanning parameters of 120 kV and 350 mgI/ml,Group L1 had the parameters as 100 kV and 350 mgI/ml and Group L2 had the parameters of 100 kV and 270 mgI/ml.The three groups had the tube voltage as 500 mA,the contrast agent dose as 25 ml,physiological saline dose as 40 ml and flow rate as 4.5 ml/s.SPSS 19.0 software was used to compare and analyze the CT values of pulmonary artery segment,superior vena cava and ascending aorta,main pulmonary artery noises,the image quality as well as the radiation doses of volume scanning.Results The three groups had the main pulmonary aortas and their branches display clearly to meet clinical requirements.When compared with Group C,Group L1 had higher CT values of the main pulmonary aorta and its branches,higher image noise while lower radiation dose(P<0.01);Group L2 had equivalent CT values of the main pulmonary aorta and its branches(P>0.05),higher image noise while lower radiation dose(P<0.01).When compared with Group L1,Group L2 had lower CT values of the main pulmonary aorta and its branches(P<0.01),and equivalent image noise and radiation dose(P>0.05).Conclusion Low-concentration contrast agent and low-dose technology gains feasibility and advantages when used in 320-slice CT pulmonary angiography.

关 键 词：肺动脉成像 320排CT 低浓度对比剂 低辐射剂量 影像质量 

分 类 号：R318.6[医药卫生—生物医学工程] TH774[医药卫生—基础医学]