恶性肿瘤是当今危害人类健康的主要疾病。在我国 ,按死亡病因排序 ,肿瘤是仅位于心脑血管病后的第二病因。因此 ,肿瘤的防治已成为当今医学界的重要课题。长期的医学经验告诉我们 ,治疗肿瘤的关键在于早期发现和诊断。目前常用的手段就是人群的定期体检 ,诸如 B超、 CT等物理手 Malignant tumors are the major diseases that endanger human health today. In China, according to the etiology of death, the tumor is the second cause of cardiovascular and cerebrovascular diseases. Therefore, the prevention and treatment of cancer has become an important issue in the medical field today. Long-term medical experience tells us that the key to treating cancer lies in early detection and diagnosis. At present, the commonly used method is the regular physical examination of the crowd, such as B-ultrasound, CT and other physical hands.