Li Luo, Wang Yi-ning, Kong Lian-yan, Wang Zhi-wei, Zhou Kang, Chen Jin, Mao Wen-bin, Wang Yun, Jin Zheng-yu
Department of Radiology, PUMC Hospital, Beijing 100730, China.
Zhongguo Yi Xue Ke Xue Yuan Xue Bao. 2010 Dec;32(6):607-10. doi: 10.3881/j.issn.1000.503X.2010.06.003.
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.
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.
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 (X2=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] .
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) .
通过双源计算机断层扫描比较前瞻性心电图（ECG）触发的螺旋扫描和序列扫描在冠状动脉计算机断层血管造影中的图像质量和辐射剂量。
将60例疑似或已知冠心病患者随机分为两组。A组进行前瞻性ECG触发螺旋扫描，B组进行前瞻性ECG触发序列扫描。比较两组的图像质量和辐射剂量。
两组患者的年龄和体重指数无显著差异。A组平均图像质量评分为1.12±0.38，B组为1.14±0.38（Z=-0.291，P=0.771）。两组诊断性冠状动脉节段的比率分别为98.87%和99.56%（X2=0.59，P=0.443）。A组的平均辐射剂量显著低于B组[（1.31±0.30）mSv对（3.36±0.93）mSv；t=11.47，P=0.000]。
对于心率低且稳定（≤70次/分钟）的患者，与前瞻性ECG触发的序列采集相比，前瞻性ECG触发的螺旋扫描用于冠状动脉计算机断层血管造影可显著降低辐射剂量且不损害图像质量。
