川北医学院学报2018，Vol.33Issue(2)：235-238,4.DOI:10.3969/j.issn.1005-3697.2018.02.024
双源CT冠脉成像安全辐射剂量与图像质量研究
Estimated safe radiation dose and image quality of coronary computed to-mographic angiography in dual-source computed tomographycoronary
郭小皖 1孙吉林 1兰艳芹 1陈英敏 1沈杉杉 1李宝山1
作者信息
- 1. 河北省人民医院医学影像科,河北 石家庄 050051
- 折叠
摘要
Abstract
Objective:To retrospectively analyze the diagnostic image quality and estimated radiation dose of the three coronary computed tomographic angiography (CCTA) acquisition protocols in a recently introduced second generation dual-source computed tomography.Methods:A total of 407 subjects underwent dual-source CCTA by using high-pitch spiral,sequential and retrospective spi-ral protocols.Effective radiation dose,expressed was calculated as the product of the dose-length product times a conversion factor of 0.014.The scores of imaging quality was evaluated on a per-segment basis,with a five-point scale.Quantitative image quality parame-ters,including image noise,attenuation,CNR and SNR,the CT density in a region of interest placed in the aortic root,LM and RCA were measured.Kruskal-Wallis tast or ANOVA were used to evaluate CNR,SNR,CTDIvol,DLP,ED were compared among the three protocols.Logistic regression analysis was performed and odds ratios (ORs) were computed to evaluate the effects of scan protocols, tube voltage and tube current on CT dose.Results:Sequence Scan[DLP=(64.87 ± 16.66),ED=(0.91 ± 0.23) mSv] and Flash-spiral method[DLP=(64.87 ± 16.66),ED=(0.91 ± 0.23) mSv]had different degree of reduced in the value of radiation dose,SD, CNR and SNR than Retrospective spiral scan method[DLP=(951.78 ± 197.92),ED=(13.33 ± 2.77) mSv].CT dose of the Flash-spiral method was significantly lowest(P<0.001) than the other two.Logistical regression analysis showed the CT dose of OR of tube voltage(OR=1.336)and scan protocol(OR=0.006)were significantly high.Conclusion:Coronary computed tomographic angiography radiation safety problem is of great significance,dual-source CCTA using Flashspiral method considerably lowers radiation exposure and maintains good image quality with fast speed.These findings may contribute to new target dose recommendations in societal guidelines.关键词
冠状动脉成像/双源螺旋CT/前瞻性大螺距螺旋扫描技术/图像质量/辐射剂量Key words
Coronary computed tomographic angiography/Dual-source computed tomography/Flashspiral/Image quality/Radi-ation dose分类
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郭小皖,孙吉林,兰艳芹,陈英敏,沈杉杉,李宝山..双源CT冠脉成像安全辐射剂量与图像质量研究[J].川北医学院学报,2018,33(2):235-238,4.
