摘要
目的比较前瞻性心电触发螺旋扫描与序列扫描模式在双源CT冠状动脉成像中的图像质量及放射剂量。方法将60例临床怀疑或已知冠心病患者采用数字表法随机分为两组,分别行前瞻性心电触发螺旋扫描(A组)与序列扫描(B组)冠状动脉CT成像,分别对两种成像模式的图像质量及放射剂量进行评价。结果两组患者的临床资料(组成、年龄、体重指数)匹配性良好,差异无统计学意义。两组的图像质量评分差异无统计学意义,分别为1.12±0.38和1.14±0.38(Z=-0.291,P=0.771),两组可评价的冠状动脉节段显示率分别为98.87%和99.56%,差异无统计学意义(χ2=0.59,P=0.443)。前瞻性心电触发螺旋扫描模式的放射剂量(1.31±0.30)mSv明显低于序列扫描模式(3.36±0.93)mSv,两组差异具有统计学意义(t=11.47,P=0.000)。结论对于心律齐且心率≤70次/min的患者,前瞻性心电触发螺旋扫描与序列扫描模式评价冠状动脉的图像质量相似,但前者的有效放射剂量明显减少。
Objective To compare the image quality and radiation dose of prospectively electrocardiogram （ECG）-triggered spiral and sequential acquisition for coronary computed tomographic angiography by dual-source computed tomography.Methods Sixty patients with suspected or known coronary artery disease were randomly divided into two groups.Group A underwent prospective ECG-triggering spiral scan and Group B underwent prospective ECG-triggering sequential scan.Both the image quality and radiation dose of the two groups were compared.Results There was no significant difference in age and body mass index of the two groups.The average image quality score was 1.12±0.38 in group A and 1.14±0.38 in group B （Z=-0.291,P=0.771）.The rates of diagnostic coronary segments for two groups were 98.87% and 99.56% respectively（χ2=0.59,P=0.443）.The mean radiation dose of group A was significantly lower than that of group B [（1.31±0.30） mSv vs.（3.36±0.93） mSv;t=11.47,P=0.000].Conclusion Compared with the prospective ECG-triggered sequential acquisition,the prospective ECG-triggered spiral scan for coronary computed tomographic angiography can remarkably reduce radiation dose without impairing image quality in patients with a low and stable heart rate （≤70 bpm）.
出处
《中国医学科学院学报》
CAS
CSCD
北大核心
2010年第6期607-610,715,共5页
Acta Academiae Medicinae Sinicae
