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目的探讨多层螺旋 CT(MSCT)低剂量普查早期肺癌的扫描方法及临床应用.方法对6000例无症状的受试者行肺部低剂量多层螺旋 CT 扫描,扫描参数为:120kVP、50-80mA,层厚5mm,螺距为1.5mm/转.在 CT 图像上,统计病变的检出例数,观察肺叶、段支气管显示情况.结果100%叶、段支气管可显示;显示2mm 以上的肺结节1273例,纵隔淋巴结增大682例,冠状动脉钙化624例,胸膜增厚或积液568例.结论多层螺旋 CT 低剂量连续扫描方法适合开展普查早期肺癌.低剂量多层螺旋 CT 可有效提高肺内非钙化小结节及支气管病变的检出率,结节周围模糊征是早期肺癌生长过程中的一个重要征象,对肺癌的筛选有重要的临床应用价值.“,”Objective To explore the scanning parameters and the clinical application of low-dose MSCT screening for early lung cancer. Methods 6000 cases volun teers underwent the low-dose MSCTwithout administration of intravenous contrast material.The scan parameters were120kVP,50 ~ 80mAs,slice thickness5mm,slice increment1.5mm.On the CT diagram resemble,statistics the pathological changes’s the example to count,and observe the bronchus to show the circumstance. Results 100%segmental bronchi were visualized at low-dose MSCT of colimation 5mm.The pulmonary nodules larger than 2mm in diameter were demonstrated in 1273 cases;and the mediastinal lymphadenopathy in 682;and corona artery calcificationin1 in 624 cases; Pleural thickening or effusion in 568 cases. Conclusion MSCT continuˉously scans the method can be adapted to low-dose screening for lung cancer. Low-dose multislice spiral ct can effectively improve the detection rate of the lungs of non-calcified smal nodules and bronchial lesions, the nodules around fuzzy levy is an important sign of early lung cancer growth process, screening for lung cancer has important clinical value