200kVp撮影の画質評価と被曝線量

概要

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Generally, high voltage radiography of the chest is performed at the tube voltage up to 150kV. Many investigations have been published on this subject, but reports on high voltage such as 200kV radiography are very few. It is known that the more the tube voltage increases, the more the image quality decreases. In this paper, two new types of high sensitive intensifying screens and a new film with fine grain are used at 200kV radiography, and information capacity (entropy) of these screen-film combinations and patient exposure are compared with those of standard screen-film combination. The value of the entropy of the combination of screen LM and film RX-G is 3 per cent higher than that of standard (screen FS and film RX) combination and the exposure is 28 per cent less. Combination FH and RX-G is 6 per cent higher in entropy and 8 per cent greater in exposure than those in standard combination.
公益社団法人日本放射線技術学会の論文
1975-05-01