目的 评价宝石能谱CT低剂量扫 描对早期肺癌诊断的临床价值。方法 对 我院2015年3月到2016年3月体检的800例 患者临床资料作回顾性分析，40例患者通 过能谱CT诊断为早期肺癌分为试验组，24 例患者通过螺旋CT诊断为早期肺癌分为对 照组，对比分析两组患者管电压、管电 流、CT剂量指数、总辐射量与早期肺癌影 像学特征。结果 试验组中管电压、管电 流、CT剂量指数与总辐射量相比于对照组 显著较低，两组对比差异具有统计学意义 (P<0.05)；试验组层厚、层距以及矩阵范 围与比较组对比，差异不具有统计学意义 (P>0.05)。两种不同剂量CT平扫均可清楚 提示肺部结节影，显示病灶影大小、形 状、位置与邻近结构状况等，能辨别病灶 属于实质性、空泡结节或高密度小班块 影，清晰呈现病灶边界分叶或毛刺征，两 组图像对比肺部气管、纵膈等结构显示差 异较小。结论 宝石能谱CT低剂量扫描可 以保证影像质量，清晰显示早期肺癌病 变特点，并且减少X线扫描剂量，安全有 效，简单廉价，对早期肺癌诊断具有显著 临床价值，可作为胸部体检有效手段广泛 使用于临床

Objective To evaluate clinical value of gemstone CT low dose scanning for early diagnosis of lung cancer. Methods The clinical data of 800 cases of physical examination in our hospital from March 2015 to March 2016 were analyzed retrospectively, 40 patients were diagnosed as early lung cancer by spectrum CT and were divided into experimental group, 24 patients were diagnosed as early lung cancer by spiral CT as control group. Compare and analyze the tube voltage, tube current, CT dose index, total radiation and early lung cancer imaging features of the two groups. Results Compared with the control group, the tube voltage, the tube current and the CT dose index in the test group were significantly lower than the control group (P<0.05). The thickness of the test group, the interval of the layer and the range of the matrix were compared with the comparison group, and the difference was not statistically significant (P>0.05). Two different dose CT scan can clearly suggest pulmonary nodules, showed lesions shadow size, shape, position and adjacent structures, etc., to identify lesions were material, cavitating nodules or high density small piece of shadow, clear present lesions border points leaves or burr), two groups of image contrast lungs, showed little differences of mediastinal structures, etc. Conclusion Gem spectrometry low dose CT scanning can ensure the quality of image, clear display characteristics of early lung cancer pathological changes, and reduce X-ray scan dose, which is safe and effective, simple and cheap, has significant clinical value in the early diagnosis of lung cancer, can be widely used in clinical.