Abstract
The software system called AISCR-V 2 (Automatic Interpretation System of Chest Roentgenograms-Version 2) was developed for automatic measurement and screening of chest photofluorograms. In this paper, the experimental results of detection of abnormal shadows in lung by this system are presented in detail. First, the outline of the pattern recognition procedure is stated. Then, some examples of 70 mm chest x-ray films and corresponding results given by the system are shown, which include lung cancer, pleurisy, sarcoidosis and bronchiectasis. Thirdly, results of classification of 15 films taken in mass screening are shown. All of 11 cases with abnormal shadows were correctly decided as abnormal, and one false alarm occurred in 4 normal cases. The system is composed of about 90 subroutines written in FORTRAN and the experiment was performed by FACOM 230/60 system at the Computation Center of Nagoya University. It took more than 20 minutes to process one film, including the output time of various intermediate results.
