256层MSCT支气管动脉CTA的扫描技术探讨  

The scanning protocol of 256-slice spiral CT for bronchial artery CT angiography

作　　者：殷允娟[1] 姜建威[1] 侯海燕[1] 王均干[1] 常军[1] 李新胜[1] 谢如奎[1] 

机构地区：[1]无锡市第三人民医院放射科,江苏无锡214041

出　　处：《南京医科大学学报（自然科学版）》2011年第7期1067-1070,共4页Journal of Nanjing Medical University(Natural Sciences)

摘　　要：目的:探讨256层CT显示支气管动脉较佳的扫描参数。方法:依据注射条件的不同,将80例行支气管动脉CT血管成像(CTA)检查的患者随机分成4组,第1、2、3组分别采用4、5、6 ml/s的对比剂注射速率,均采用阈值触发技术扫描,触发阈值均设为300 HU,对比剂总量采用1.5 ml/kg体重。第4组采用6 ml/s注射速率,触发阈值设为120 HU,对比剂总量采用1.0ml/kg体重。扫描结束后,测量各组患者肺动脉、上腔静脉、主动脉及支气管动脉增强扫描增加的CT值,并统计各组支气管动脉显示的优良率。结果:各组肺动脉和上腔静脉增强后增加的CT值间均无统计学差异。增强扫描后主动脉增加的CT值在第4组和1、2、3组之间均有统计学差异;支气管动脉增加CT值在第4组和第1、2组间均有统计学差异,其余组间均无统计学差异。1～4组支气管动脉显示的优良率分别为:50%、55%、65%和80%。结论:采用6 ml/s注射速率、120 HU的触发阈值、1.0ml/kg体重对比剂总量及高浓度对比剂(350mgI/ml),利用MPR、MIP和VR技术是支气管动脉CTA较理想的条件。Objective：Comparison of different scanning and injection protocols for bronchial artery CT angiography（CTA）.Methods：Eighty cases scheduled for bronchial artery CTA were randomly assigned into four groups according to the injection protocol.Cases in group 1 to group 3 adopted the injection rate of 4,5 and 6 ml/s respectively,and used automatic threshold preset at 300 HU to trigger the initiation of the scan,with total contrast dose of 1.5 ml/kg body weight.Cases in the group 4 adopted an injection rate of 6 ml/s,triggering threshold of 120 HU,and 1.0 ml/kg body weight of contrast.High density contrast（350 mgI/ml）was used in all cases.The CT values of pulmonary artery,superior vena cava,aortic artery and bronchial artery before and after enhanced scanning were measured in the 4 groups.Numbers of cases with excellent image quality of bronchial artery display were also evaluated.Results：The CT values of pulmonary artery and superior vena cava among four groups hadn＇t significant difference（P 0.05）.The CT values of aortic artery in group 4 were higher than other three groups significantly（P 0.05）.The CT values of bronchial artery in group 4 were higher than group 1 and group 2 significantly（P 0.05）.The excellent rate of bronchial artery CTA for group one to group four were： 50%,55%,65% and 80%,respectively.Conclusion：This research showed that the injection rate of 6 ml/s,triggering threshold of 120 HU,1.0 ml/kg body weight of high density contrast dose provide higher contrast,and it＇s on optimal protocol for bronchial artery CTA.

关 键 词：支气管动脉 体层摄影术 X线计算机 血管成像 

分 类 号：R814.42[医药卫生—影像医学与核医学]