Friedrich M, Weskamp P
Rofo. 1976 Sep;125(3):269-79. doi: 10.1055/s-0029-1230461.
The physical parameters of three radiographic filming systems used for mammography were analysed (industrial film without screens, lo dose system (Dupont), industrial film with lo dose screens). Their effect on image quality was studied and the influence of the exposure geometry on sharpness and detail was investigated experimentally. Geometrical unsharpness so reduces the difference in definition between screenless industrial film and a film-screen combination that the total unsharpness at the centre of the breast parenchyma of an average breast becomes approximately the same. In particular, recognition of fine detail (microcalcification) is reduced by geometric unsharpness. Final grading of the three film systems is only possible after development of a concept of film quality which takes account of the parameters of the filming system and of exposlre geometry, together with physiological and practical requirements (paper II).
对用于乳腺摄影的三种射线摄影成像系统的物理参数进行了分析（无增感屏的工业胶片、低剂量系统（杜邦公司）、带低剂量增感屏的工业胶片）。研究了它们对图像质量的影响，并通过实验研究了曝光几何条件对清晰度和细节的影响。几何不清晰度极大地减小了无屏工业胶片与胶片-增感屏组合之间的清晰度差异，以至于平均乳房乳腺实质中心处的总不清晰度变得大致相同。特别是，几何不清晰度会降低对细微细节（微钙化）的识别能力。只有在形成一个考虑到成像系统参数、曝光几何条件以及生理和实际需求的胶片质量概念之后，才能对这三种胶片系统进行最终分级（论文二）。
