Flat-Panel Detector を用いた Dual-Energy Subtraction System における胸部軟部組織画像を対象とした撮影条件の最適化 : 正規化順位法による管電圧の組み合わせの視覚的検討

概要

論文の詳細を見る
The new dual-energy subtraction system allows the fast (200 millisecond) acquisition of two, high and low voltage images using CsI : Tl amorphous silicon flat-panel technology. The purpose of this study was to determine the best combination of the voltage for the soft tissue image of the chest radiography. The dual-energy subtraction imaging increases the sensitivity and specificity of the pulmonary nodule detection in the chest radiography by reducing the contrast of overlying the bone structures. The range of the high and low voltage we used was from 120kV to 150kV and 60kV to 80kV, respectively. Six radiographers evaluated these images with the normalized-rank approach. All rank orders were transformed to the distance scale by the statistical method. The ranking in the low voltage was better in the order corresponding to 60kV, 70kV and 80kV ( p < 0.05 ) . The ranking in the high voltage with fixed low voltage 60kV showed better in the order corresponding to 140kV, 150 kV, 130kV and 120kV. The best combination for the soft tissue image of the chest in this system was 140kV (high voltage) and 60kV (low voltage) .
医用画像情報学会の論文
2005-01-01