基础医学与临床 ›› 2016, Vol. 36 ›› Issue (8): 1135-1138.

• 临床园地 • 上一篇    下一篇

80kVp管电压联合自动管电流调节腹主动脉及双下肢动脉CTA扫描图像质量的评价

张大明,薛华丹,王萱,金征宇,孙昊,陈钰,谢彦婷   

  1. 北京协和医院
  • 收稿日期:2016-04-05 修回日期:2016-05-28 出版日期:2016-08-05 发布日期:2016-07-13
  • 通讯作者: 金征宇 E-mail:jin_zhengyu@163.com
  • 基金资助:
    014年卫计委公益性行业科研专项项目

Evaluation of image quality of abdominal aorta and lower extremity artery CTA under 80kVp tube voltage with ATCM

  • Received:2016-04-05 Revised:2016-05-28 Online:2016-08-05 Published:2016-07-13

摘要: 目的 通过比较80kV与120kV管电压下双下肢CTA成像扫描的辐射剂量、图像质量,评价低管电压下腹主动脉及下肢动脉CTA扫描的可行性。方法 本研究为回顾性研究,共计入组34名患者,分别使用80kV或120kV管电压进行腹主动脉及双下肢动脉CTA扫描,通过定性和定量评价轴位、三维重建图像,并进行Shapiro-WilkNormal分布检验和独立样本t检验。通过测量腹主动脉、双侧髂总动脉、股总动脉、股浅动脉、腘动脉、胫腓干的CT值并计算CNR,并评价图像质量。结果 80kV管电压组的血管CT值在542HU至601HU之间,高于120kVp管电压组。两组之间的CNR无统计学差异,定性评价也没有差异。80kVp管电压组的DLP为205.94±20.69 mGy·cm,120kV管电压组为775.47±82.85 mGy·cm,有效剂量下降了73%。结论 低管电压联合自动管电流调节技术进行腹主动脉及双下肢动脉CTA扫描时可以在降低辐射剂量的同时保证图像质量。

关键词: 腹主动脉, 双下肢动脉, CTA, 管电压, 自动管电流调节

Abstract: Objective The aim of the research was to compare the radiation dose and image quality of abdominal aorta and lower extremity artery CTA under 80kV and 120kV,to evaluate the feasibility of low tube voltage abdominal aorta and lower extremity artery CTA. Methods It was a retrospective research, there were 34 patients who were divided into two groups with 80kV or 120kV tuber voltage separately received abdominal aorta and lower extremity CTA. The objective and subjective evaluations were done based on axial and 3D reconstruction images. The data was analyzed by Shapiro-WilkNormal distribution test and independent t test. Results The CT number of arteries under 80kV tube voltage was between 542HU to 601HU, which were much higher than that under 120kV tube voltage. There were no statistical difference between CNR and objective evaluation between the two groups. The DLP of group A with 80kV tube voltage was 205.94±20.69 mGy·cm, and which was 775.47±82.85 mGy·cm of group B with 120kV tube voltage. The DLP decreased 73%. Conclusion The image quality of abdominal aorta and lower extremity artery CTA under 80kV tube voltage with ATCM could meet the need of clinical diagnose.

Key words: abdominal aorta, lower extremity atery, CTA, tube voltage, ATCM

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