シカゴ大学における医用画像研究について : 増感紙フィルム系の感度とX線吸収特性

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The Kurt Rossmann Laboratories for Radiologic Image Research have conducted the basic studies in the area of optical imaging properties of radiographic systems, radiographic mottle, X-ray spectral analysis and computer simulations during the last two decades. In this article we have discussed our recent research on the absolute speeds and absorbed-energy constants of screen-film systems. Absolute speeds (mR^<-1>) of 27 screen-film systems were determined accurately and precisely from ten independent measurements over a six month period at several beam qualities that included both scatter and scatter-free conditions. The absorbed X-ray energies in the screens that yielded a net film density of 1.0 were obtained by means of Monte Carlo calculations and a semianalytical method. The standard deviations of the calculated absorbed X-ray energies at different beam qualities were less than 10% for all of the screen-film systems studied. Therefore, the absorbed X-ray energy that produces a given film density for these systems can be regarded as constant at the beam qualities used. Quantum absorption and fractional energy absorption of the screens were also calculated. The predicted wiener spectral values based on the number of photons detected were compared with the measured wiener spectral values of the screen-film systems.
社団法人日本放射線技術学会の論文
1985-05-01