目的为了评估冠状动脉CT造影(CCTA)的可行性和图像质量(IQ),采用低对比剂注入率,管电压为70 kVp。探讨冠状动脉CTA检查采用注射低容量和低速度对比剂,研究其图像质量。方法 114例疑似冠心病患者,心率为小于70次/分,随机分为两组。A组和B组,分别注射28毫升和40毫升含碘造影剂,造影剂浓度为370 mgI/ml,造影剂的流速为分别在3.5毫升/秒和5毫升/秒。冠状动脉近端段的CT Objectives To assess the feasibility and quality of images (CC) of coronary CT angiography, a low contrast injection rate of 70 kVp was used. To investigate coronary CTA using injection of low-volume and low-speed contrast agent to study its image quality. Methods 114 patients with suspected coronary heart disease, heart rate was less than 70 beats / min, were randomly divided into two groups. Groups A and B were injected with 28 ml and 40 ml iodine-containing contrast media at a concentration of 370 mgI / ml and contrast media at 3.5 ml / sec and 5 ml / sec, respectively. Coronary proximal segment CT