放大摄影为特殊X线摄影术,早已被应用于各种检查中,尤其在早期矽肺的诊断上其价值已被公认。但使用高千伏(95～125千伏)作为肺部放大摄影来诊断矽肺目前尚未广泛使用,高千伏放大摄影操作简单,且可以解决普通放大片和普通胸片无法解决的一些问题。为了尽可能地减少矽肺X线诊断与病理表现上的差距及减少O～I期的例数,我们曾给147例观察对象(O-I)采用了高千伏放大摄影,目的在于探索此种方法的表现与普通放大片和普通胸片的差异及其特点以及在早期诊断上的意义。材料和方法 1973年10月至1977年6月对局管内矽尘作业工人;最短工龄2年,最长工龄20年,绝大多数为隧道开挖工(风钻干式作业为主),少数工种为石工、开山、支柱、采石、翻砂等工种共147例。都是经过普通胸片两张以上集体诊断为观察对象者。采用西门子Ergophos2型和国产KB400型诊断X线机单相全波整流,旋转阳极1.2×1.2毫米的有效集点,阴极扬起12度使用歪脖子遮线筒照射野限制在胶片范围内,靶一片距为200厘米,物一片距为 Magnification photography for special X-ray photography, has long been used in various examinations, especially in the early diagnosis of silicosis its value has been recognized. However, it is not yet widely used to diagnose silicosis with high kV (95-125 kV) as an enlarged lung photography. The high kV magnification photography is easy to operate and can solve some problems that can not be solved by ordinary and general chest radiographs. In order to minimize the difference between the diagnostic and pathological manifestations of silicosis and to reduce the number of cases of stage O to I, we have used high kV magnification photography for 147 subjects (OIs) in order to explore this method Differences between the performance and the ordinary and general chest radiograph and its characteristics and the significance of early diagnosis. Materials and methods Silicone dust workers in the tube from October 1973 to June 1977; the minimum working length was 2 years and the maximum length of service was 20 years. The vast majority of workers were tunnel diggers (mainly dry-type drillers) and a few workers For the masonry, mountains, pillars, quarrying, foundry and other types of work a total of 147 cases. After more than two are common chest X-ray diagnosis of the collective observed objects. Using Siemens Ergophos2 and domestic KB400-based diagnostic X-ray single-phase full-wave rectifier, rotating anode 1.2 × 1.2 mm effective collection point, the cathode raised 12 degrees using crooked neck mask exposure field limit within the film, the target A distance of 200 cm, a piece of material from