在1958年以前,我国对尘肺的种类发现不多,主要只是考虑矽肺的问题。由于当时厂矿企业缺乏防尘措施,工作面的粉尘浓度较高,游离二氧化矽含量亦较高(一般都>30％),所以出现的矽肺主要是结节型占大多数。因此,我国1963年矽肺X线诊断标准(下简称1963年标准)以结节影为诊断一期、二期矽肺的唯一标志是符合客观情况 Before 1958, the type of pneumoconiosis found in our country was not much, mainly considering the problem of silicosis. Due to the lack of dust control measures at factories and mines at the time, high concentration of dust on the working face and high free silica content (generally> 30%), the majority of the occurrence of silicosis was nodular. Therefore, our country in 1963 diagnostic criteria for silicosis X (hereinafter referred to as the 1963 standard) with nodules for the diagnosis of a period, the only sign of two silicosis is in line with the objective situation