Feasibility of Low Tube Current Combined with SAFIRE to Reduce Radiation Dose in Dual-energy Coronary Artery CT Angiography
10.3969/j.issn.1005-5185.2015.04.010
- VernacularTitle:低管电流结合迭代重建双源双能量冠状动脉CT血管成像降低辐射剂量的可行性
- Author:
Xiaolong PAN
;
Dan HAN
;
Yamin DENG
;
Hui DUAN
;
Zhenghua ZHANG
;
Wei ZHAO
- Publication Type:Journal Article
- Keywords:
Coronary disease;
Tomography,X-ray computed;
Coronary angiography;
Radiation dosage
- From:
Chinese Journal of Medical Imaging
2015;(4):283-288
- CountryChina
- Language:Chinese
-
Abstract:
Purpose Dual-energy coronary artery CT angiography (CTA) is a very promising one-stop examine, but the radiation dose is too high to hinder the development of the technology. The aim of this article is to explore the feasibility of low tube current combined with sonogram-affirmed iterative reconstruction (SAFIRE) technology in dual energy coronary artery CTA scan. Materials and Methods One hundred and twenty patients were randomly divided into four groups according to the tube current of A ball:conventional group (180 mAs) and low-dose groups (150 mAs, 120 mAs, 90 mAs). The SAFIRE 3 reconstruction method was used in the low-dose groups. The differences of mean CT values, image noise, signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR), image quality score and effective dose (ED) of the four groups were compared. Results The coronary artery segment display and the mean CT value of the four groups showed no statistic difference (P>0.05), while the image quality score, noise, SNR, and CNR showed statistic difference (P<0.05). The image quality score, SNR, and CNR was highest in the 150 mAs group, but noise was the lowest. There were no statistic difference of the image quality score, SNR, and CNR between the 180 mAs group and 90 mAs group (P>0.05). The ED was (5.50±1.47) mSv, (4.55±1.16) mSv, (3.41±0.77) mSv and (2.44±0.67) mSv, respectively for the four groups, and there was statistical difference (P<0.05). ED of 90 mAs group decreased 55.62% than that of 180 mAs group. Conclusion Coronary artery CTA using 90 mAs combined with SAFIRE can significantly reduce the radiation dose without losing image quality, thus it has a good prospect of clinical application.
