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Recently, The cancer patient’s are increased by medical examination. So, The government going into action for the preventation of cancer. Especially, The stomach cancer is the first rank of occurrence in Korea and the medical examination of stomach is increased. But we don’t know a patient’s exposure dose during the study of UGI series. The purpose of this study is to get the patient’s exposure dose data by the Bit system and the NDD method and suggest the reduction of the patient’s exposure dose. The results as follow 1. The patient’s total exposure dose are 17R(Bit system), 16.5R(NDD Method) on the average.2. The plan of the reduction is concerned with time, filtration, technique, distance, X-ray generator etc.
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