Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Structurally defined
Patent
1995-12-19
1997-05-27
Huff, Mark F.
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Structurally defined
430567, 430140, 430944, 430966, 430523, G03C 176, G03C 1005
Patent
active
056331266
ABSTRACT:
A radiation-sensitive silver halide film for reproducing digitally stored medical diagnostic images through a series of laterally offset exposures by a controlled radiation source followed by processing in 90 seconds or less, including development, fixing and drying. The film exhibits an average contrast in the range of from 1.5 to 2.0, measured over a density above fog of from 0.25 to 2.0. An emulsion layer is provided in which silver bromochloride grains (a) comprised of at least 10 mole percent bromide, based on silver, (b) having a mean equivalent circular diameter of less than 0.40 .mu.m, (c) exhibiting an average aspect ratio of less than 1.3, and (d) coated at a silver coverage of less than 40 mg/dm.sup.2. Adsorbed to the surfaces of the silver bromochloride grains at least one spectral sensitizing dye having an absorption half peak bandwidth in the spectral region of exposure by the controlled exposure source. The film contains an infrared opacifying dye that is capable of reducing specular transmission through the film before, during and after processing to less than 50 percent, measured at a wavelength within the spectral region of from 850 to 1100 nm. The film contains a magnetic recording layer which provides a positive b* value influence that is more than offset by the negative b* value influence of the silver bromochloride emulsion, allowing magnetic recording layer integration into the film while achieving favorable image tone and minimum density characteristics.
REFERENCES:
patent: 4665004 (1987-05-01), Drexler
patent: 4801523 (1989-01-01), Tufano
patent: 5252441 (1993-10-01), James et al.
patent: 5260178 (1993-11-01), Harada et al.
patent: 5420001 (1995-05-01), Ito et al.
Research Disclosure, vol. 365, Sep. 1994, Item 36544.
Dickerson Robert E.
Lobo Lloyd A.
Nair Mridula
Oltean George L.
Eastman Kodak Company
Huff Mark F.
Thomas Carl O.
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