前瞻性心电门控多期相重建在儿童冠状动脉CT检查中的应用

目的:探讨前瞻性心电门控多期相重建技术在儿童冠状动脉CT成像中的应用.方法:回顾性选取2017年6月-2018年5月在本院行冠状动脉CTA检查且心率为100～120次/分的60例患儿作为对照组,采用回顾性心电门控多相位扫描技术,重建40％、45％、50％、70％、75％和80％R-R间期的6组图像,选取其中冠状动脉成像...

Application of prospective ECG-gated multi-phase reconstruction technique for coronary artery CT examination in children

Objective:To evaluate the application of prospective ECG-gated multi-phase reconstruction technique for coronary artery CT examination in children.Methods:60 children aged 2~4 years with heart rate of 100~120 beats per minute(bpm)who underwent coronary artery CT angiography examination from June 2017 to may 2018 were retrospectively selected as control group.Retrospective ECG gated multi-phase reconstruction technology was used to reconstruct six sets of images at 40%,45%,50%,70%,75%and 80%R-R interval,the phase with the highest subjective evaluation score of coronary angiography was found out.60 children aged 2~4 years with heart rate of 100~120bpm were prospectively selected as study group for coronary artery CT scan from June 2018 to May 2019,ECG-gated multi-phase reconstruction technique was used to reconstruct coronary artery images at 40%,45%and 50%R-R interval,and the phase with the highest subjective evaluation score of coronary angiography was found out.Scanning parameters,dosage of contrast medium and injection protocols of contrast medium were the same in both groups.The radiation dose and image quality of coronary artery were compared between the two groups.Results:In the study group,the image quality scores of 40%,45%and 50%phase were 4.02±0.70,4.88±0.33 and 4.07±0.73,respectively.In the control group,the image quality scores of 40%,45%,50%,70%,75%and 80%phase were 2.33±1.50,4.90±0.52,2.30±1.38,2.30±1.38,1.30±0.62 and 1.18±0.47,respectively.The highest subjective evaluation score of coronary artery reconstruction images was 45%phase in both groups with no statistically significant difference(P>0.05).The average effective radiation dose(ED)in the study group was(0.42±0.07)mGy,and in the control group was(2.87±0.48)mGy,the ED in study group was 85%lower than that of the control group,the difference was statistically significant(P<0.05).The contrast medium volume in the study group was(19.24±5.12)mL,in the control group was(18.75±4.26)mL,there was no significant difference(P>0.05).Conclusion:The prospective ECG-gated multi-phase reconstruction technique can be applied as a routine coronary artery CT examination method in children,which can significantly reduce the radiation dose received by children without affecting the imaging quality.