本文研究了895名英国煤工胸片上小阴影的主要形态,目的在于确定不规则(与圆不同的)小阴影识别的重现性、不规则小阴影的发生与粉尘接触的关系以及与超高的呼吸道症状发生率或肺功能障碍的关系。本研究根据1980年ILO分类法,由6名医师担负所有英国煤工定期的X线检查,对895张胸片 This paper examines the major morphological patterns of small shadows on 895 British coal chest radiographs with the aim of determining the reproducibility of irregular (different from the circle) small shadow identification, the relationship between the occurrence of irregular small shadows and dust exposure, The incidence of respiratory symptoms or pulmonary dysfunction. According to the 1980 ILO classification, this study was performed by six physicians on a regular x-ray examination of all British coal workers, and 895 chest radiographs