Effects of two scanning methods on image quality and radiation dose in CT coronary angiography
Li Hongmei
Hua Li
Zhang Caihui
Zhang Shan
Zhang Jiqing
Zhang Yueying
Abstract：Objective To investigate the effects of prospective electrocardiographic(ECG) gated scanning and retrospective ECG gated scanning on image quality and radiation dose in CT coronary angiography (CTCA).Methods A total of 180 patients undergoing CTCA examination from March to December 2016 in Second Hospital of Shanxi Medical University were randomly divided into group A(92 cases) and group B (88 cases).Group A had prospective ECG gated cardiac scanning and group B had retrospective ECG gated scanning.Image quality and radiation dose were evaluated.Results Gender,age,body mass index and pre-scanning heart rate were similar between groups(all P ＞0.05).Heart rate and heart rate variability during scanning in group B were significantly higher than those in group A(P ＜0.01).With image quality score≥3 used as the judging standard,there was no significant difference of the percentage of coronary artery segments available for diagnosis between groups (x2 =1.37,P ＞ 0.05).Using image quality score ≥ 2 as the standard,group B showed higher quality of images that could be used for specific diagnosis than group A [93.4％ (674/722) vs 97.4％ (835/857)] (x2 =15.42,P ＜ 0.05).Effective radiation dose in group B was significantly higher than that in group A [(6.9 ± 0.6) mSv vs (2.3 ± 0.6) mSv] (P ＜ 0.0l).Conclusion With an appropriate range of heart rate (＜ 70 beats/min),using prospective ECG gated scanning of CTCA can obtain high-quality image and reduce radiation dose.
Keywords：Coronary artery diseaseComputed angiographyImage qualityRadiation dose
Publication Date：2019-01-01
Online Publishing Date：2026-09-14(First online date of this platform, not the publication date of the document)
Pages：4( 334-337 )