Shaw A, Moores B M
Phys Med Biol. 1985 Mar;30(3):229-38. doi: 10.1088/0031-9155/30/3/003.
The transfer of noise through the stages of a screen-film subtraction process was investigated. In particular the effect of measuring aperture size and film density on the measured noise granularity was studied. The relative contributions of quantum noise and film grain noise were found to depend on both aperture and density. Noise measurements are presented for a medium speed screen-film combination and also for a low noise alpha 16-Kodak Industrex C system. The effect of grain mottle and film blur on noise transfer through the multiple print process employed in subtraction radiography is demonstrated.
研究了噪声在屏-片减影过程各阶段的传递情况。特别研究了测量孔径大小和胶片密度对所测噪声颗粒度的影响。发现量子噪声和胶片颗粒噪声的相对贡献取决于孔径和密度两者。给出了中速屏-片组合以及低噪声α 16 -柯达工业胶片C系统的噪声测量结果。展示了颗粒斑纹和胶片模糊对减影放射摄影中采用的多次打印过程中噪声传递的影响。
