低管电流结合迭代重建双源双能量冠状动脉CT血管成像降低辐射剂量的可行性

发布时间：2018-02-11 00:11

本文关键词： 冠心病体层摄影术 X线计算机冠状血管造影术辐射剂量　出处：《中国医学影像学杂志》2015年04期 　论文类型：期刊论文

【摘要】：目的双能量冠状动脉CT血管成像(CTA)是一种非常具有前景的一站式检查,但较高的辐射剂量使其应用受到限制,本文拟探讨低管电流结合基于原始数据的迭代重建(SAFIRE)技术双能量冠状动脉CTA低剂量检查的可行性。资料与方法 120例检查者根据A球管电流随机分为常规180 m As、滤波反投影重建组及低剂量150 m As、120 m As、90 m As组,每组30例,低剂量组采用SAFIRE 3重建,比较4组平均CT值、图像噪声(SD)、信噪比(SNR)、对比噪声比(CNR)、图像质量主观评分及辐射剂量(ED)。结果 4组病例冠状动脉显示节段、平均CT值差异无统计学意义(P0.05),图像质量主观评分、SD、SNR、CNR差异有统计学意义(P0.05),其中150 m As组图像质量主观评分、SNR、CNR最高,SD最低;但常规180 m As组与90 m As组图像质量主观评分、SD、SNR、CNR差异无统计学意义(P0.05);4组ED分别为(5.50±1.47)m Sv、(4.55±1.16)m Sv、(3.41±0.77)m Sv、(2.44±0.67)m Sv(P0.05),90 m As组较180 m As组ED下降了55.62%。结论90 m As结合SAFIRE行双能量冠状动脉CTA检查能够保证图像质量,并大幅降低辐射剂量,具有较好的应用前景。
[Abstract]:Objective Dual-energy coronary CT angiography (CTAA) is a promising one-stop examination, but its application is limited by high radiation dose. This paper is to investigate the feasibility of low-dose double-energy coronary CTA with low-tube current combined with iterative reconstruction based on original data. Data and methods 120 examiners were randomly divided into conventional 180 m Ass according to A-tube current. Filter backprojection reconstruction group and low dose 150m Asln 120m as 90mAs group. 30 cases in each group were reconstructed with SAFIRE 3 in low dose group. The mean CT value, image noise, signal-to-noise ratio (SNR), contrast noise ratio, subjective image quality score and radiation dose were compared among 4 groups. Results Coronary artery segments were displayed in 4 groups. There was no significant difference in average CT value (P 0.05), but there was significant difference in subjective score of image quality (SDR) and SNRCNR (P 0.05). The subjective score of image quality in 150 Mas group was the highest and the lowest in SNR CNR. However, there was no significant difference in the subjective score of image quality between the normal 180 as group and 90 m as group. Conclusion the Ed of the four groups were 5.50 卤1.47 m SvlV, 3.41 卤0.77 m SvlV, 2.44 卤0.67 m SvlP 0.05 and 90 m as group were lower than that of the 180 m as group, respectively. Conclusion 90m as combined with SAFIRE is lower than the 180mAs group in double energy coronary artery CTA (Ed = 2.44 卤0.67mSvP0.05 + 90 mAs). Conclusion\\\; The quality of the image can be guaranteed by the inspection, And the radiation dose is greatly reduced, which has a good application prospect.
【作者单位】：昆明医科大学第一附属医院医学影像科;
【分类号】：R816.2

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