Application of 70 kV with 30 mL contrast medium by dual-source CT with Stellar photon detector in coronary angiography
10.3969/j.issn.1002-1671.2016.03.028
- VernacularTitle:光子探测器双源CT70kV联合低对比剂在冠状动脉CTA中的应用
- Author:
Baojin CHEN
;
Ximing WANG
;
Zhaoping CHENG
;
Yanhua DUAN
;
Yaodong QI
;
Rui KANG
;
Wen LIU
- Publication Type:Journal Article
- Keywords:
Stellar detector;
computed tomography;
coronary angiography;
radiation;
contrast medium
- From:
Journal of Practical Radiology
2016;32(3):432-436
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the value of prospectively electrocardiogram (ECG)-triggered high-pitch coronary computed tomography angiography at 70 kV and 30 mL contrast medium with Stellar detector dual-source CT.Methods 60 patients with the BMI<24.9 kg/m2 were randomized into two groups:Group A (30 cases)with the tube voltage of 70 kV and 30 mL contrast medi-um.Group B (30 cases)with the tube voltage of 100 kV and 50 mL contrast medium.All the patients were performed with a Stellar detector dual-source CT using a prospectively ECG triggered high-pitch spiral technique.The images of Group A were reconstructed with SAFIRE technique,while Group B were with FBP technique.The objective image quality includes CT attenuation,SNR, CNR.And radiation dose was also calculated.The subjective was evaluated by 4-scale point.Independent sample t test was used.Re-sults There was no difference for subjective image quality between the groups,A:(3.38±0.942),B:(3.50±0.682),(t=-0.562, P >0.05).The CT attenuation of the 70 kV group were higher than that of the 100 kV group for all the segments(P <0.01).The SNR and the CNR have no statistically significant difference between the groups (P >0.05).Compared with the 100 kV group,the radiation dose of the 70 kV group was reduced by 76.5% (A:0.19±0.023 mSv,B:0.81±0.101 mSv,P <0.01).Conclusion Using 70 kV with 30 mL contrast medium in Stellar detector dual-source CT coronary angiography for the patients with a normal BMI could obtain qualified diagnostic image with low radiation dose and contrast medium.
