文章摘要
殷允娟,姜建威,侯海燕,王均干,常 军,李新胜,谢如奎.256层MSCT支气管动脉CTA的扫描技术探讨[J].南京医科大学学报,2011,(7):1067~1070
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
投稿时间:2011-02-13  
DOI:10.7655
中文关键词: 支气管动脉  体层摄影术, X线计算机  血管成像
英文关键词: bronchial artery  tomography  X-ray computed  angiography
基金项目:
作者单位
殷允娟 无锡市第三人民医院放射科,江苏 无锡 214041 
姜建威 无锡市第三人民医院放射科,江苏 无锡 214041 
侯海燕 无锡市第三人民医院放射科,江苏 无锡 214041 
王均干 无锡市第三人民医院放射科,江苏 无锡 214041 
常 军 无锡市第三人民医院放射科,江苏 无锡 214041 
李新胜 无锡市第三人民医院放射科,江苏 无锡 214041 
谢如奎 无锡市第三人民医院放射科,江苏 无锡 214041 
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中文摘要:
      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1.0 ml/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?
英文摘要:
      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.
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