Value of prospectively electrocardiography-triggered high-pitch computed tomography in the follow-up of patients with previous coronary stent implantation
10.3760/cma.j.issn.0253-3758.2012.11.009
- VernacularTitle:双源CT新扫描模式在冠状动脉支架置入术后随访中的应用价值
- Author:
Ying ZHOU
1
;
Qi WANG
;
Feng TIAN
;
Jun-Jie YANG
;
Xia YANG
;
Jing DONG
;
Xiao-Bo YANG
;
Bai HE
;
Yun-Dai CHEN
Author Information
1. 南开大学医学院临床医学系
- Keywords:
Coronary disease;
Stents;
Tomography,X-ray computed;
Radiation dosage
- From:
Chinese Journal of Cardiology
2012;40(11):933-938
- CountryChina
- Language:Chinese
-
Abstract:
Objective To explore the value of prospectively ECG-triggered high-pitch spiral mode CT coronary angiography (CTCA) in the follow-up of patients with prior coronary stent implantation.Methods According to the different scan modes,ninety-six patients with heart rate below 75 beat per minute,sinus rhythm and weight below 100 kg and previous coronary stent implantation who underwent 128-slice dual-source Flash spiral CT coronary angiography were randomly divided into two groups according to the randomly numbers in the envelopes:group A (the prospective electrocardiography gated group,50 cases) and group B (the prospectively ECG-triggered high-pitch spiral mode group,46 cases).The image quality was evaluated with a four-point grading scale (1 =excellent,2 =good,3 =poor,4 =very poor or non-diagnostic).The total effective dose and the total dose length product between the two groups were recorded respectively.The CTCA enhanced effective dose,dose length product,and the CT volume dosage index(CTDIvol) between the two groups were recorded respectively.Results A total of 157 stents were implanted,there were 78 stents in group A and 79 stents in group B,and the value of the image quality was (1.3 ± 0.6) scores in group A and (1.4 ± 0.6) scores in group B (P ＞ 0.05).The total effective dose [(7.6±1.8) mSv vs.(1.6±0.3) mSv] and dose length product [(545.8±131.5)mGy×cm vs.(111.4 ± 19.8) mGy × cm] of the entire scan process were significantly higher in group A than in group B (all P ＜ 0.01).The CTCA enhanced effective dose [(6.7 ± 1.7) mSv vs.(1.2 ± 0.2) mSv],dose length product [(480.8 ± 121.9) mGy × cm vs.(84.2 ± 17.5) mGy × cm] and the CTDIvol [(35.7 ± 8.6) mGy vs.(4.5 ±0.9)mGy] of group A were also significantly higher than those in group B(all P ＜ 0.01).Conclusions It is clinically feasible to use the dual-source Flash spiral CT coronary angiography for the follow-up of the patients with previous coronary stent implantation.This new process can substantially reduce the radiation dose while preserving good imaging quality.
