一、前言早期诊断、早期治疗为预防医学的基本原则;尤以肺结核若能利用 X 线检查胸部,确能于病的前期发现,是为今日医学界所公认而强调的。由于劳保条例及公费医疗制度之施行,人民生活及卫生需要逐渐提高,胸部 X 线例行检查,在大城市已成为迫切之需要。以京津两市而论,因 X 线设备及医师之缺乏,团体检查常须等候月余或数月之久。由于祖国大建设即将开始,医务工作者必须配合搞 I. Foreword Early diagnosis and early treatment are the basic principles of preventive medicine. In particular, if pulmonary tuberculosis can be checked by X-ray, it can indeed be found in the early stage of the disease and is recognized and emphasized by the medical profession today. Due to the implementation of the labor protection regulations and the public health medical system, people’s living and health needs have gradually increased. The routine examination of chest X-ray has become an urgent need in the big cities. In terms of Beijing and Tianjin, due to the lack of X-ray equipment and physicians, group inspections often have to wait for months or months. As the motherland construction is about to begin, medical workers must work together