基于能谱CT低流速低对比剂在肺动脉CTA图像质量的研究  

Study on the Image Quality of Low Flow Rate and Low Contrast Agent in the Pulmonary Artery Based on Energy Spectrum CT

作　　者：周大伟 赵英明 李欣欣 段惠予 仇好 刘欣[1,2] 张晓龙 高之振 ZHOU Da-wei;ZHAO Ying-ming;LI Xin-xin;DUAN Hui-yu;QIU Hao;LIU Xin;ZHANG Xiao-long;GAO Zhi-zhen(Department of Radiology,the First Affiliated Hospital of Bengbu Medical College,Bengbu 233004,Anhui Province,China;School of Graduate,Bengbu Medical College,Bengbu 233030,Anhui Province,China;The First Affiliated Hospital of University of Science and Technology of China,Hefei 230001,Anhui Province,China)

机构地区：[1]蚌埠医学院第一附属医院放射科,安徽蚌埠233004 [2]蚌埠医学院研究生院,安徽蚌埠233030 [3]中国科学技术大学附属第一医院(安徽省立医院)CT室,安徽合肥230001

出　　处：《中国CT和MRI杂志》2024年第1期63-65,共3页Chinese Journal of CT and MRI

基　　金：蚌埠医学院研究生科研创新计划自筹经费项目(Byycxz22105)。

摘　　要：目的探讨采用能谱CT结合低流速低对比剂在肺动脉CTA中的可行性,并评价其图像质量。方法回顾性分析在安徽省立医院行肺动脉CTA检查的146例患者,随机分成两组,对照组采用常规螺旋CT扫描,观察组用能谱CT联合低对比剂、低流速方法扫描,比较两组图像的客观评分、主观评分及平均碘摄入量。结果两组患者的肺动脉主干、左、右肺动脉干的平均CT值和图像主观评分差异无统计学意义(P>0.05),观察组的背景噪声(SD值)、信噪比(SNR)、对比噪声比(CNR)较对照组略高,但差异无统计学意义(P>0.05),与对照组相比观察组的CT容积剂量指数(CTDI vol)、辐射剂量长度乘积(DLP)和有效辐射(ED)显著降低,差异有统计学意义(P<0.05);观察组有效辐射、平均碘摄入量比对照组分别降低34.82%、48.25%,差异有统计学意义(P<0.05)。结论应用低流速低对比剂结合能谱CT单能量技术,在图像质量满足诊断要求的基础上,显著降低了患者的辐射剂量和碘摄入量。Objective To investigate the feasibility of spectral CT monochromatic energy technology combined with low flow rate and low contrast agent in pulmonary artery CTA,and to evaluate the image quality.Methods A retrospective analysis of 146 patients who underwent pulmonary artery CTA examination in our hospital was conducted.They were randomly divided into two groups,73 cases in each group.The control group was scanned by conventional spiral CT,and the observation group was scanned by energy spectrum CT combined with low contrast agent and low flow rate method.The objective score,subjective score and average iodine intake of the two groups were compared.Results there was no significant difference in the average CT value and image subjective score of pulmonary artery trunk,left and right pulmonary artery trunk between the two groups.The background noise(SD),signalto-noise ratio(SNR)and contrast-to-noise ratio(CNR)in the observation group were slightly higher than those in the control group,but there was no significant difference between the two groups.The CT volume dose index(CTDI vol),radiation dose length product(DLP)and effective radiation(ED)in the observation group were significantly lower than those in the control group(P<0.05).The effective radiation and average iodine intake in the observation group were 34.82%and 48.25%lower than those in the control group,respectively,and the difference was statistically significant(P<0.05).Conclusion the application of low flow rate and low contrast medium combined with energy spectrum CT single energy technique can significantly reduce the radiation dose and iodine intake of patients on the basis of image quality meeting the diagnostic requirements.

关 键 词：双低技术 能谱CT 肺栓塞 肺动脉CT血管造影 图像质量 

分 类 号：R445.3[医药卫生—影像医学与核医学] R563.5[医药卫生—诊断学]