目的 研究双源CT低剂量技术在 疑是胸部病变患者CT检查中的应用价值。 方法 选取2013年11月至2014年11月来我 院接受检查的161例疑是胸部病变患者， 按照患者前来就诊的先后顺序将患者分 为7组，每组23例，对7组患者分别采用 常规管电流量110mAs和低管电流量105， 100，95，90，85，80 mAs进行测量，比 较各组患者肺动脉分叉平面肺动脉信噪 比、肺动脉-竖脊肌对比噪声比、降主动 脉信噪比、降主动脉-竖脊肌对比噪声 比、图像主观质量评分及病变检出情况。 结果 随着放射剂量的降低，肺动脉和降 主动脉的信噪比逐渐降低(P＜0.05)；各 组图像质量评分随着球管电流量的减小而 降低(P＜0.05)；80mAs低管电流量组病变 检出率为81.25%较其余各组显著较低(P ＜0.05)。结论 双源CT低剂量技术能在疑 是胸部病变患者CT检查中给予准确判断， 能有效降低放射对人体造成的伤害，建议 行双源CT检查时采用85mAs的参考管电流 量，既能获得准确清晰的诊断图像又能明 显降低患者所受辐射剂量。

Objective to study the dual-source CT low-dose technology in the application of CT examination in patients with suspected chest lesions. Methods Selection in November 2013 to November 2014 in our hospital for inspection of 161 patients with suspected chest lesions, according to the order of patients in the hospital can be divided into 7 groups, each group of 23 cases, the 7 groups patients respectively using conventional pipe electricity flow 110 mAs and low electrical flow 105, 100, 95, 90, 85, 80 mAs measurement, comparison between groups in patients with pulmonary artery bifurcation plane the signal-to-noise ratio of pulmonary artery, pulmonary artery - sma vertical contrast to noise ratio, the descending aorta signal-to-noise ratio, the descending aortasma vertical contrast to noise ratio, the subjective image quality score and lesion detection. Results With the reduction of radiation dose, the signal-to-noise ratio of the pulmonary artery and the descending aorta gradually reduced (P<0.05). Each image quality score and decreased with the decrease of the bulb electricity flow (P<0.05), 80 mas electric flow of low duct lesion detection rate of 81.25% from the rest of the group was significantly lower (P<0.05). Conclusion Dual-source CT low-dose technique can in suspected lesions in patients with chest CT examination to give accurate judgment, can effectively reduce the radiation damage to human body, suggested that dual-source CT examination with 85 mas reference pipe flow, both can obtain accurate diagnostic images clearly and can significantly reduce the radiation dose