发明授权
US5965318A Photographic silver halide material for mammography 失效
用于乳腺摄影的摄影卤化银材料

Photographic silver halide material for mammography
摘要:
A photographic silver halide material and a method using said material for mammography are disclosed. The photographic material has a large dynamic range and a high contrast, so that lesions deep in the glandular tissue are accurately detected, and also clearly depicts thin tissue such as the skin line of the breast. The sensitometric curve of optical density versus logarithmic exposure logE of said photographic material is characterised by (i) an average gradation of at least 3.5 between Dmin+1.0 and Dmin+2.5; and (ii) a local gradient ranging from 0.7 to 1.8 and an optical density not higher than 3.5 at the point where logE equals SP+0.8 (SP being defined as the logE at which the optical density equals Dmin+1.0); and (iii) an optical density of at least 3.7 at the point where logE equals SP+1.3.
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