コンピューテッドラジオグラフィ(CR)の胸部撮影における被曝線量低減を目的とした撮影条件の最適化に関する基礎的研究

概要

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This study was made to find out optimized radiographic conditions of radiography and exposure dose for CR chest imaging. We calculated average radiographic conditions around 1/4, median and 3/4 value in order to figure out the factors which made difference of Entrance surface dose among each institute. Incident surface dose value is dependent on tube voltage set up, mAs value, total filtering, grid ratios and etc. The reason for high dose in CR radiography was set up condition of low kV and high mAs. The optimized conditions of CR chest radiography is: 120kV of tube voltage, 4mAs of mAs, 200cm of FFD, 2.5mm of total filtering and 10:1 of grid ratio. If this optimized conditions are applied to CR radiography by each institute, dose reduction is realized and radiographic conditions will be optimized.
2001-01-01