一、引言我国有上千万从事各种各样粉尘作业的工人,由于他们长期在高浓度粉尘的环境中工作,肺中往往滞留一定量长期排不出来的有害粉尘,其与肺泡组织进行生化反应而形成病理变化,于是造成了范围很广、危害极大的职业尘肺病。迄今,检查和诊断职业性尘肺病的唯一有效手段是 X 射线法。X 射线法属于影象学范畴,只有形成病理变化以后才能被诊断出来。然而,形成病理变化的过程是一个不可 I. INTRODUCTION There are tens of millions of workers engaged in various kinds of dust operations in our country. Due to their long-term work in the environment of high concentration of dust, the lungs often retain a certain amount of harmful dust that can not be discharged for a long time and are biochemically alveolar tissue The reaction and the formation of pathological changes, resulting in a wide range of occupational pneumoconiosis great harm. To date, the only effective means of examining and diagnosing occupational pneumoconiosis is the X-ray method. X-ray imaging belongs to the category of imaging, and only after the formation of pathological changes can be diagnosed. However, the process of forming a pathological change is a must