Early lung cancer CT screening Lung cancer is one of the most malignant tumors in our country with high morbidity and mortality and the greatest threat to human health and life. Clinically, early detection of early treatment is the key to reducing lung cancer mortality. However, in China, 75% of lung cancer patients are diagnosed late, and their five-year survival rate is less than 20%. Early detection of lung cancer is the detection of small pulmonary nodules, for the discovery of early lung cancer, timely intervention, to improve the survival rate of lung cancer patients, reduce treatment costs, reduce patient pain and so important.