Abstract：Objective To investigate the feasibility of 320-row volume CT ‘Target CTA (computed tomography angiography) scan
mode’ for coronary CT angiography in patients with heart rate less than 75 times/min. Methods A total of 78 patients with resting
heart rate less than 75 times/min who were to undergo coronary angiography were collected and randomly divided into two groups:
39 cases in group A received the traditional default prospective ECG gated acquisition mode with exposure time window (35%-85%
of R-R interval); 39 cases in group B received the target CTA acquisition mode of the second-generation 320-row volume CT, and
the Target Phase was set as 75% of the R-R interval as the center. The subjective image quality was evaluated and graded based on a
4-point scale. The objective image quality was evaluated by CT value of main branch vessels, image noise, signal to noise ratio (SNR)
and contrast to noise ratio (CNR), and the effective dose (ED) was calculated. Results Using the second generation 320-row volume
CT target CTA acquisition mode reduced the radiation dose by 66.1% compared with the traditional prospective electrocardio-gated
acquisition mode [(5.9±1.0) mSv vs. (2.0±0.7) mSv], and the difference was statistically significant (t=-15.175, P<0.05). There
were no statistically significant differences in noise, SNR and CNR, and subjective score of image quality between group A and
group B (all P>0.05). Conclusion The second-generation 320-row volume CT target CTA scanning mode can significantly reduce
radiation dose while ensuring image quality for coronary CT angiography in patients with heart rate below 75 times/min.
吴锟，陈希奎，唐贵超，郑成凤，范明，赵荣芳，詹红利，邓利华. 320排容积CT“Target CTA扫描模式”在低心率患者冠状动脉CT血管成像中的应用探究[J]. 中国医疗设备, 2023, 38(1): 77-82.
WU Kun, CHEN Xikui, TANG Guichao, ZHENG Chengfeng, FAN Ming, ZHAO Rongfang, ZHAN Hongli, DENG Lihua. Application Study of “Target CTA Scanning Mode” in 320-Row Volume CT for Coronary
Angiography in Patients with Low Heart Rate. China Medical Devices, 2023, 38(1): 77-82.
