Fearon T, Vucich J, Hoe J, McSweeney W J, Potter B M
Invest Radiol. 1986 Aug;21(8):654-62.
We evaluated the physical characteristics and contrast-dose-detail performance of 11 rare-earth and three calcium tungstate screen-film systems. Measurements included system speed, contrast, sensitometry, RMS noise, square-wave response function, and contrast-dose-detail analysis. The major differences in physical characteristics among systems were system speed and RMS noise. Square-wave response differences were more subtle. For contrast-dose-detail analysis, the rare-earth screen-film systems and the calcium tungstate system responses were significant over a limited subject contrast range as a function of detail diameter. Relative dose efficiency in the noise-limited region is a function of the properties of the screen only and is independent of the film.
我们评估了11种稀土和3种钨酸钙增感屏-胶片系统的物理特性以及对比剂剂量-细节性能。测量包括系统速度、对比度、感光度测定、均方根噪声、方波响应函数以及对比剂剂量-细节分析。各系统之间物理特性的主要差异在于系统速度和均方根噪声。方波响应差异更为细微。对于对比剂剂量-细节分析，稀土增感屏-胶片系统和钨酸钙系统的响应在有限的受检者对比度范围内随细节直径的变化而显著。在噪声受限区域的相对剂量效率仅取决于增感屏的特性，与胶片无关。
