Application of computed radiography for the diagnosis of pneumoconioses.
Nobechi T; Tateno Y; Shida H; Hosoda Y; Toriwaki J; Kobatake H; Iinuma T; Fukuhisa K; Matsumoto T; Takano M; Kato H; Tachi M; Chiba Y
Proceedings of the VIIth International Pneumoconioses Conference, August 23-26, 1988, Pittsburgh, Pennsylvania, USA. Atlanta, GA: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control, National Institute for Occupational Safety and Health, DHHS (NIOSH) Publication No. 90-108, 1990 Sep; (Part I):495-496
Experiments were carried out to determine the application of computer radiography for the diagnosis of cases of pneumoconiosis. For two of the experiments the International Labor Office (ILO) Standard films and test films selected from training films of pneumoconioses in the United States were digitized by using a drum scanner. In another of the experiments the Fuji Computed Radiography (FCR) films of pneumoconioses patients were used with the fixed contrast of 0.85 gamma with several spacial frequency characteristics. Magnetic tapes of the digitized images of ILO standard film and test films and FCR were used for the evaluation of the automatic determination of the size and profusion of small rounded opacities. Two methods were used for this purpose. The one was a direct detection method using difference linear filtering and the other was a texture analysis method. It was apparently easy to determine the size and various other parameters, while the automatic categorization of the profusion was not so easy for the low profusion groups, although various methods disclosed an accuracy of 45 to 71%. The authors conclude that the results of these experiments are promising for the future application of computer technique for the automatic diagnosis of pneumoconioses.
Diagnostic techniques; Clinical diagnosis; Respiratory system disorders; Computer models; Pulmonary disorders; Radiographic analysis
DHHS (NIOSH) Publication No. 90-108
Proceedings of the VIIth International Pneumoconioses Conference, August 23-26, 1988, Pittsburgh, Pennsylvania, USA