The diagnostic value of radiophotograms (R. P.) and the reading ability of readers play an important role in the efficiency of mass case-finding by X-ray.
The study was carried out to investigate the diagn o stic value of 70 mm R. P. by mirror camera and to evaluate the reading ability of physicians working in the T. B. control, based on the results of a R. P. reading contest.
A total of 192 physicians had participated in the contest. Most of them were from health centers, health service sections of enterprises, mass examination specialized agencies, etc.
Fifty R. P. pictures were read by each reader at the contest. They were consisted of 25pictures showing active lesions of pulmonary tuberculosis or other chest diseases, , 5 with healed lesions only, and 20 without lesions. Those cases had been diagnosed precisely by radiograms and other examinations.
If a reader failed to indicate a further examination for a case with active lesions, it was judged “overlooking”, and if he indicated a further examination for a case without lesions, it was judged “overreading”
