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近年来,世界上肺癌的发病率和死亡率呈上升趋势。2002年全世界的肺癌新病例大约为135万,死亡118万,居恶性肿瘤第一位。肺癌已成为我国近年来城乡前十位恶性肿瘤之首,居恶性肿瘤死亡原因首位。预计未来15年,我国肺癌病人将达到100万,成为世界第一肺癌大国。目前医学水平还不能使癌症病人得到逆转,只能减轻症状,减少并发症,延长寿命。大气道内癌肿可以引起患者不同的临床症状:咳嗽、咳痰、胸闷、不同程度的呼吸困难,甚至可能引起窒息。胸部CT是目前诊断和了解中央型肺癌的重要检查方法。因此利用CT对大气道内癌肿进行早期发现,早期诊断,可以为临床治疗手段提供指导,对提高大
In recent years, the incidence and mortality of lung cancer in the world are on the rise. In 2002, the number of new cases of lung cancer in the world was about 1.35 million, with 1.18 million deaths, ranking the first among all malignant tumors. Lung cancer has become the top ten malignant tumors in urban and rural areas in China in recent years, ranking first in the cause of death from malignant tumors. It is estimated that in the next 15 years, the number of lung cancer patients in China will reach 1 million and become the largest lung cancer country in the world. The current medical level can not make the cancer patients reversed, can only reduce the symptoms, reduce complications and prolong life expectancy. Atmospheric airway cancer can cause different clinical symptoms of patients: cough, sputum, chest tightness, varying degrees of breathing difficulties, and may even cause asphyxia. Chest CT is currently an important method of diagnosis and understanding of central lung cancer. Therefore, the use of CT on the early detection of airway cancer, early diagnosis, can provide guidance for clinical treatment, to improve the large