摘要
目的:评价预注射双点监测法行多层螺旋CT肺动脉成像(CTPA)和肺静脉成像(CTPV)的成像技术及图片质量。方法:应用MSCT对30例疑似肺动脉栓塞患者行CTPA及CTPV检查。对比剂剂量为20ml(370mg I/ml),所有患者均采用预实验时间-密度曲线法,监测平面定于支气管隆突水平。CTPA及CTPV的兴趣区(ROI)分别选在肺动脉主干及相应层面肺静脉内,分别获得肺动脉及肺静脉时间-密度曲线,以对比剂注射开始到增强峰值的时间为延迟时间。采用盲法对CTPA及CTPV图像中同级别肺动静脉CT值进行测量并进行统计学分析。结果:30例患者均同时获得肺动脉及肺静脉的时间-密度曲线。肺动脉对比剂达峰值时间为(10.2±1.8)s,肺静脉对比剂达峰值时间为(14.7±2.3)s。所有图像均能清晰显示肺动静脉1～4级血管。CTPA及CTPV图像中1～4级动静脉血管CT值差异均具有统计学意义(P<0.05)。结论:预注射双点监测法可同时完成CTPA及CTPV肺动静脉各级分支成像,并且达到临床诊断要求。
Objective：To evaluate the technology and image quality of CT pulmonary artery angiography（CTPA） and pulmonary venography（CTPV） with double-point pretest time-density curve technique.Methods：30 patients suspected of pulmonary embolism underwent CTPA and CTPV with 20ml contrast medium.The pretest time-density curve（PTDC） was used.Monitor plane was set on tracheal carina.The region of interest of CTPA and CTPV was selected on the main pulmonary artery and corresponding vein respectively.The delay time was defined as the time from injection to the peak.CT value of the pulmonary artery and vein in the same level was measured by blind method.Results：PTDC of pulmonary artery and vein were obtained in all cases.The peak time of pulmonary artery and vein was（10.2±1.8）s and（14.7±2.3）s respectively.Branches 1~4 of pulmonary artery and vein were displayed clearly on all images.The CT value of branch 1~4 of pulmonary artery and vein has statistics difference（P〈0.05）.Conclusion：Using double-point pretest time-density curve technique can show clearly the pulmonary artery/vein and their branches,and achieve the essentials for clinical diagnosis.
出处
《放射学实践》
2012年第9期960-962,共3页
Radiologic Practice
关键词
体层摄影术
X线计算机
肺动脉
肺静脉
Tomography,X-ray computed； Pulmonary artery； Pulmonary vein
