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This develops a diagnosis system for perfusion-ventilation lung SPECT Image.The system applies the Bayes classifier to recognizing the lung from perfusion-ventilation lung SPECT image,and implements the fuzzy clustering method to separate the nght and left pulmonary lobes.The edges of pulmonary obes are detected with a contour tracer.The system can automatically separates the pulmonary lobe into 9 regions and calculate the radiation counts and its proportion in the total counts.Finally,the system can use a medical information database to store the perfusion and ventilation lung SPECT images and export the corresponding diagnosis report.