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本课题旨在研究煤工X线胸片X线小阴影类型的分类倾向。资料为1970～1989年间88名B组阅片者的15403份1类煤工尘肺(CWP)的胸片。胸片分类归入1971 ILOU/C法,用最高密集度的类型作为小阴影的优势类型。胸片分类归入1980 ILO法,小阴影的优势类型由G组阅片者确定。在此期间,观察到最明显的分类倾向为,P型阴影占优势胸片的比例普遍下降,这种情况主
The purpose of this project is to study the classification tendency of X-ray small shadow types in coal workers X-ray. Data were chestnails of 15,403 Category 1 coal worker’s pneumoconiosis (CWP) specimens from 88 Group B readers readings between 1970 and 1989. The classification of chest radiographs was classified as the 1971 ILOU / C method with the highest intensity type as the dominant type of small shadow. The classification of chest radiographs was classified as the 1980 ILO method, and the dominant type of small shadow was determined by radiologists in Group G. During this period, it was observed that the most obvious classification propensity was the general decline in the proportion of P-type shadow-dominant chest radiographs