摘要
目的探讨不同追踪触发监测频率对冠状动脉CTA图像质量及辐射剂量的影响。方法选择2016年1月至2018年12月佛山市禅城区中心医院诊治的144例冠心病患者为研究对象,按随机数表法将其分为A (54例)、B (46例)、C (44例)三组,均接受冠状动脉CTA检查,A、B、C三组追踪触发监测频率分别为1.14 s、1.17 s、2.00 s,观察并比较三组冠状动脉CTA图像质量及辐射剂量的差异。结果 A组、B组和C组患者的反折现象比率分别为22.22%、17.39%和6.82%,差异有统计学意义(P<0.05);A组、B组和C组患者主动脉根部(AO)的CT值[(486.23±5.02) Hu vs (464.22±6.57) Hu vs (494.17±5.91) Hu]、噪声[(34.25±5.26) vs (32.11±4.25) vs (33.47±4.23)]、信噪比(SNR)[(14.455±3.20) vs (15.23±2.15) vs (14.28±1.32)]和对比信噪比(CNR)[(23.45±10.23) vs (20.23±8.78) vs (25.47±5.56)]比较差异均无统计学意义(P>0.05);A组、B组和C组患者右冠状动脉近段(RCA)和左主干(LM)中的CT值[(472.44±64.11) Hu vs (455.27±95.21) Hu vs (455.78±62.44) Hu]和CNR [(25.44±7.23) vs (28.47±23.01) vs (28.47±5.26)]以及主观评分[(1.89±0.06)分vs (1.86±0.04)分vs (1.88±0.05)分]等指标比较差异均无统计学意义(P>0.05);A组监测次数为(4.77±2.23)次,高于B组的(3.72±1.44)次和C组的(2.71±0.95)次,而B组又高于C组,差异均有统计学意义(P<0.05);A组、B组和C组患者辐射剂量中的剂量长度乘积(DLP)[(4.10±2.23) mSv vs (2.15±0.82) mSv vs (1.51±0.53) m Sv]和有效剂量(ED)[(0.057±0.031) mSv vs (0.034±0.015) mSv vs (0.023±0.008) mSv]比较,A组均高于B、C两组,B组又高于C组,差异均有统计学意义(P<0.05)。结论不同追踪触发监测频率获得图像质量均较高,但监测频率为2.00 s时能显著降低监测次数及辐射剂量。
Objective To investigate the effect of different tracking trigger monitoring frequencies on the image quality and radiation dose of coronary computed tomography angiography(CTA). Methods A total of 144 patients with coronary heart disease, who admitted to Foshan Chancheng District Central Hospital from January 2016 to December 2018, were selected and divided into group A(n=54), group B(n=46) and group C(n=44) according to random number table method. All patients underwent coronary CTA examination, and the tracking trigger monitoring frequencies for group A, B and C were 1.14 s, 1.17 s and 2.00 s, respectively. The differences of image quality and radiation dose of three groups of coronary CTA were observed and compared. Results The ratio of reflexion in group A, B and C were22.22%, 17.39% and 6.82%, respectively, and there were significant differences among the three groups(all P<0.05).There was no significant difference in CT value of aortic root(AO), noise, signal-to-noise ratio(SNR), and contrast-to-noise ratio(CNR) among the three groups(all P>0.05):(486.23 ± 5.02) Hu vs(464.22 ± 6.57) Hu vs(494.17 ±5.91) Hu),(34.25±5.26) vs(32.11±4.25) vs(33.47±4.23),(14.455±3.20) vs(15.23±2.15) vs(14.28±1.32),(23.45±10.23)vs(20.23±8.78) vs(25.47±5.56), respectively. There was no significant difference in CT value of right coronary artery(RCA) and left main(LM), CNR, and subjective score among the three groups(all P>0.05):(472.44 ± 64.11) Hu vs(455.27±95.21) Hu vs(455.78±62.44) Hu,(25.44±7.23) vs(28.47±23.01) vs(28.47±5.26),(1.89±0.06) vs(1.86±0.04) vs(1.88±0.05). There were significant differences in the monitoring times among group A, group B and group C(all P<0.05):(4.77±2.23) times vs(3.72±1.44) times vs(2.71±0.95) times. There were also significant differences in dose-length product(DLP) and effective dose(ED) among group A, group B and C(all P<0.05):(4.10±2.23) m Sv vs(2.15±0.82) m Sv vs(1.51±0.53) m Sv),(0.057±0.031) m Sv vs(0.034±0.015) m Sv vs(0.023±0.008) m Sv. Conclusion The quality of images obtained by different tracking trigger monitoring frequencies is high, but when the monitoring frequency is 2 s, the monitoring frequency and radiation dose can be significantly reduced.
作者
区贤斌
黄锦炽
梁嘉杰
徐振锋
蔡锋
黄启明
OU Xian-bin;HUANG Jin-chi;LIANG Jia-jie;XU Zhen-feng;CAI Feng;HUANG Qi-ming(Department of Medical Imaging, Chancheng District Central Hospital, Foshan 528000, Guangdong, CHINA)
出处
《海南医学》
CAS
2019年第14期1823-1826,共4页
Hainan Medical Journal
基金
广东省佛山市自筹经费类科技计划项目(编号:2018AB001161)
关键词
双源CT
冠状动脉
团注
自动触发技术
冠心病
图像质量
Dual-source CT
Coronary artery
Bolus injection
Automatic trigger technology
Coronary heart disease
Image quality
作者简介
通讯作者:区贤斌,E-mail:178303340@qq.com.
