胸部撮影のための新しい増感紙-フィルム系の画像特性

概要

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To evaluate the clinical usefulness of a new screen-film system (advanced screen-film system ; AD system) for chest radiography, its fundamental imaging properties were investigated. The basic imaging properties were evaluated by measuring characteristic (H&D) curves, relative speeds, MTFs (modulation transfer functions), WS (Wiener spectra), and x-ray attenuation of screens. The film gradient of the AD system was slightly lower at low radiographic density, and higher at high density. The screen speed of the AD system was 112% greater than that of the conventional system, and the film speed was 47% lower. As the result, the total speed of the AD system was slightly higher compared with the conventional system. Resolution property of the AD system was comparable to or slightly lower than that of the conventional system. However, the noise level of the AD system was considerably lower than that of the conventional system at low and middle photographic density levels. X-ray attenuation of the HG-M screens was about 10% higher than that of the conventional screens. We conclude that the AD system has superior imaging properties than the conventional system.
公益社団法人日本放射線技術学会の論文
1996-04-20