摘要
目的探讨低管电流联合窄窗、迭代重建技术在降低冠状动脉CT血管成像辐射剂量中的价值。方法将80例怀疑冠心病患者随机分为A、B两组,每组40例,行CCTA,A组扫描管电压为120kV、管电流为智能毫安,扫描窗为心动周期的30%-80%;B组扫描管电压为120kV、管电流为智能毫安的75%,扫描窗为心动周期的70%-80%。对A组进行滤波反投影法重建(filteredbackprojection,FBP)和迭代重建(iterativereconstruction,IR)得到AF和AI两组,B组进行IR重建,比较3组图像的噪声、信噪比(SNR)、主观图像质量(评分)及辐射剂量(effectivedose,ED)。结果 AI、B、AF组噪声依次升高,SNR依次降低,AF组与AI、B间的噪声及SNR差异均有统计学意义(P<0.05);主观图像质量评价,AI组优于其他两组(P<0.05),AF组最差,AF与B组差异无统计学意义(P>0.05);A、B两组ED分别为(3.40±1.34)mSv、(1.26±0.61)mSv,有统计学差异(P<0.05)。结论在不降低冠状动脉成像质量的情况下,低管电流联合窄窗、迭代重建技术能降低CCTA的辐射剂量。
Objective To investigate the value of low tube current combined with narrow window and iterative reconstruction in reducing radiation dose of coronary CT angiography. Methods 80 patients with suspected coronary heart disease were randomly divided into two groups: group A and group B, 40 patients in each group were treated with CCTA. Group A had 120 kV scan tube voltage, intelligent milliampere tube current and scan window 30%-80% of cardiac cycle. Group B had 120 kV scan tube voltage,75% of intelligent milliampere tube current and scan window 70%-80% of cardiac cycle.Group A was reconstructed by filtering back projection(FBP) and iterative reconstruction(IR) to obtain AF and AI. Group B was reconstructed by IR. The noise, signal-to-noise ratio(SNR), subjective image quality(score) and radiation dose(ED) of the three groups were compared. Results Noise in AI, B and AF groups increased and SNR decreased in turn. There was statistical significance in noise and SNR between AF group and AI and B group(P<0.05). Subjective image quality evaluation showed that AI group was better than other two groups(P<0.05), AF group was the worst, and there was no statistical significance between AF group and B group(P>0.05). EDs in A and B groups were(3.40±1.34) mSv and(1.26±0.61) mSv, respectively, with statistical difference(P<0.05).Conclusion Low tube current combined with narrow window and iterative reconstruction can reduce the radiation dose of CCTA without reducing the quality of coronary artery imaging.
作者
王忠德
刘金丰
刘海龙
周桂忠
WANG Zhong-de;LIU Jin-feng;LIU Hai-long(Department of Functional Examination,Zhuhai Hospital of Guangdong Provincial Hospital of Traditional Chinese Medicine,Zhuhai 519015,Guangdong Province,China)
出处
《中国CT和MRI杂志》
2019年第3期79-82,共4页
Chinese Journal of CT and MRI
基金
珠海市卫计局项目(No:2017J006)
关键词
冠状动脉
心电图
窄窗
迭代算法
低剂量
Coronary Artery
Electrocardiogram
Narrow Window
Iterative Algorithm
Low Dose
作者简介
通讯作者:刘金丰.
