Bednarek D R, Rudin S
Department of Radiology, Erie County Medical Center, State University of New York at Buffalo 14215, USA.
Radiology. 1996 Nov;201(2):572-3. doi: 10.1148/radiology.201.2.8888262.
To increase the utility of the monthly accreditation mammographic phantom image, the authors added a light sensitometric strip on the same film. The optical densities of the steps on the sensitometric strip with values nearest those of the phantom background and disk were measured, and these optical densities and the density difference were recorded and plotted on a control chart. The ability was increased to determine if changes in the contrast or optical density on an image were due to film and associated processing or to the x-ray source.
为提高每月认证乳腺摄影体模图像的效用，作者在同一张胶片上添加了一条光密度测定条。测量光密度测定条上与体模背景和圆盘值最接近的台阶的光学密度，并记录这些光学密度和密度差，并绘制在控制图上。确定图像上对比度或光学密度的变化是由于胶片及相关处理还是由于X射线源的能力得到了提高。
