摘要
目的评价利用低剂量对比剂的双层探测器光谱CT肺动脉成像图像质量,探讨肺动脉管径对图像的影响。方法回顾性分析2022年3月至8月在郑州大学第一附属医院行双层探测器光谱CT肺动脉成像的91名被检者的影像资料,其中,肺动脉主干直径≥30 mm的34例为组1,肺动脉主干直径<30 mm的57例为组2。对比剂用量为30 ml。两组肺动脉主干至亚段肺动脉的CT值、标准差(SD)、信噪比(SNR)以及对比噪声比(CNR)进行了比较。记录辐射剂量参数CT容积剂量指数(CTDIvol)和有效剂量长度乘积(DLP)。2名阅片者采用3分法评估图像质量,利用Kappa检验分析结果的一致性。结果两组图像肺动脉主干、左肺动脉干CT值差异无统计学意义(P>0.05)。组1的左肺上叶动脉、段动脉、亚段动脉CT值低于组2(t=-2.13、-2.17,Z=-2.33,P<0.05)。组1的肺动脉主干和段动脉SD值高于组2(t=2.27,Z=-2.23,P<0.05)。左肺动脉干、左肺上叶动脉、亚段动脉SD值两组之间差异无统计学意义(P>0.05)。肺动脉主干、组1的左肺动脉干、左肺上叶动脉、段动脉SNR值和CNR值低于组2(Z=-2.45、-2.57、2.09、-3.58,P<0.05;Z=-2.33、2.42、2.07、3.45,P<0.05)。亚段动脉SNR值、CNR值两组间差异无统计学意义(P>0.05)。两名阅片者的评分结果一致性良好(Kappa值>0.75,P<0.05)。结论光谱CT肺动脉成像30 ml低剂量对比剂可以获得良好的肺动脉图像,肺动脉主干管径>30 mm特别是疑诊肺动脉高压的患者肺动脉远端分支显示不佳。
Objective Evaluate the image quality of dual-layer spectral detector CT pulmonary angiography with low-dose contrast agents,and explore the influence of pulmonary artery diameter on the image quality.Methods A total of 91 spectral CT pulmonary angiography from March 2022 to August 2022 were retrospectively analyzed.The cases were divided into Group 1(n=34,main pulmonary artery diameter≥30 mm)and Group 2(n=57,main pulmonary artery diameter<30 mm).The dosage of contrast agent was 30 ml.The CT attenuation values(CT values),standard deviation(SD),signal-to-noise ratio(SNR),and contrast-to-noise ratio(CNR)values of pulmonary artery from the main trunk to the subsegmental pulmonary artery between two groups were compared.The CT dose index volume(CTDIvol)and dose-length production(DLP)were recorded.Two readers evaluated the image quality using three-point method.The inter-reader agreement was performed by Kappa test.Results The CT values of the pulmonary trunk and left pulmonary artery between two groups was not significantly different(P>0.05).The CT values of the left upper lobe artery,segmental artery,and subsegmental artery in Group 1 were lower than those in Group 2(t=-2.13,-2.17,Z=-2.33,P<0.05).The SD values of pulmonary trunk and segmental artery in Group 1 were higher than those in Group 2(t=2.27,Z=-2.23,P<0.05).The SD values of left pulmonary artery,left upper lobe artery,and subsegmental artery between two groups were not significantly different(P>0.05).The SNR and CNR values of main pulmonary trunk,left pulmonary artery,left superior lobar artery,and segmental artery in Group 2 were higher than those in Group 1(Z=-2.45,-2.57,-2.09,-3.58,P<0.05;Z=-2.33,-2.42,-2.07,-3.45,P<0.05),while these values of the subsegmental artery between two groups were not significantly different(P>0.05).The two readers had good consistency in evaluating image quality(Kappa value>0.75,P<0.05).Conclusions Spectral CT pulmonary angiography with 30 ml contrast agent would generate good quality images.However,the distal pulmonary arter
作者
梁晓雪
高剑波
李睿
王小鹏
苏蕾
Liang Xiaoxue;Gao Jianbo;Li Rui;Wang Xiaopeng;Su Lei(Radiology Department,First Affiliated Hospital of Zhengzhou University,Zhengzhou 450000,China)
出处
《中华放射医学与防护杂志》
CAS
CSCD
北大核心
2023年第10期812-819,共8页
Chinese Journal of Radiological Medicine and Protection
基金
河南省科技攻关项目(232102310282)。
关键词
光谱CT
肺动脉成像
肺动脉高压
对比剂
Spectral CT
Pulmonary angiography
Pulmonary hypertension
Contrast agent
