发明授权
- 专利标题: Photographic silver halide material for mammography
- 专利标题(中): 用于乳腺摄影的摄影卤化银材料
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申请号: US50020申请日: 1998-03-30
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公开(公告)号: US5965318A公开(公告)日: 1999-10-12
- 发明人: Rudy Goedeweeck , Guy Vastenaeken , Luc Heremans , Kathy Elst
- 申请人: Rudy Goedeweeck , Guy Vastenaeken , Luc Heremans , Kathy Elst
- 申请人地址: BEX Mortsel
- 专利权人: AGFA-Gevaert, N.V.
- 当前专利权人: AGFA-Gevaert, N.V.
- 当前专利权人地址: BEX Mortsel
- 优先权: EPX97201194 19970423
- 主分类号: G03C5/17
- IPC分类号: G03C5/17 ; G03C1/00 ; G03C1/46 ; G03C5/16 ; G03C1/035
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.
公开/授权文献
- US4784196A Method and apparatus for debarking logs 公开/授权日:1988-11-15
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