双源CT低剂量技术在疑是胸部病变患者CT检查中的应用

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110m As和低管电流量105,100,95,90,85,80 m As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(P0.05);各组图像质量评分随着球管电流量的减小而降低(P0.05);80m As低管电流量组病变检出率为81.25%较其余各组显著较低(P0.05)。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85m As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。

Dual-source CT Low-dose Technology Used in Suspected Lesions in Patients with Chest CT Examination

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 aorta-sma 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.