Using a low voltage radiography apparatus, the authors tried out a method for obtaining almost the same effect as that of high voltage radiography which latter has proved to have many advantages. Satisfactory results were to some degree obtained after making some fundamental experiments and applying them to clinics, using some adequate filters and voltage ranging between 80 kVp and 90 kVp, so called "Hard X-ray". The study owed much to the article by Prof. Koga, Tohoku Univ. which was written in the "Rinsho to Kenkyu", Apr., 1960.
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