DSAシステムの特性曲線 : 測定法の比較

概要

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The "DSA characteristic curve" is the most important factor in evaluating the physical performance in digital subtraction angiography(DSA) systems, and is expressed as output DSA pixel value to input relative X-ray intensity. In this study, utilizing the DFA-II system, three methods were compared in measuring characteristic curves : (1) the aluminium step-wedge method ; (2) inverse-square method ; and (3) time-scale method. In the aluminium step-wedge method, a fluorescence meter and a film-screen system were employed as detectors to determine relative X-ray intensity. Results indicated that the characteristic curves measured by the three methods were almost identical and had very few errors. In the three methods, the time scale method was the most useful for the DFA-II system due to its simplicity and accuracy.
公益社団法人日本放射線技術学会の論文
1988-10-01