Portal imaging assembly with magenta filter and method of use
AssigneeEastman Kodak Company
InventorsRobert E. Dickerson, William E. Moore
Life of this patent
Estimating the term…
Abstract
A radiographic imaging assembly has first and second radiographic silver halide films in association with two fluorescent intensifying screens. Between one set of screen and film is a magenta filter having a density of at least 0.3 to provide improved exposure latitude for use in various exposure conditions and equipment. The magenta filter comprises a transparent support having a hydrophilic layer disposed thereon, which layer includes sufficient dyes or pigments that absorb in the range of from about 500 to about 600 nm. These dyes or pigments are dispersed in a hydrophilic binder to provide the desired density. The magenta filter is laminated to one of the screens with its hydrophilic layer in contact with the screen.
Claims16
A radiographic imaging assembly comprising the following components arranged in association, in order:
- (a) a first fluorescent intensifying screen,
- (b) a first radiographic silver halide film,
- (c) a second radiographic silver halide film, and
- (d) a second fluorescent intensifying screen,
- said first radiographic silver halide film comprising a support having first and second major surfaces and is capable of transmitting X-radiation,
- said first radiographic silver halide film having disposed on said first major support surface, one or more hydrophilic colloid layers including at least one silver halide emulsion layer, and on said second major support surface, one or more hydrophilic colloid layers including at least one silver halide emulsion layer,
- each of said silver halide emulsion layers comprising silver halide cubic grains that have the same or different composition in each silver halide emulsion layer, and all hydrophilic layers of said first radiographic silver halide film being fully forehardened and wet processing solution permeable for image formation within 45 seconds,
- said second radiographic silver halide film comprising a support having first and second major surfaces and is capable of transmitting X-radiation,
- said second radiographic silver halide film having disposed on said first major support surface, one or more hydrophilic colloid layers including at least one silver halide emulsion layer, and on said second major support surface, one or more hydrophilic colloid layers including at least one silver halide emulsion layer,
- each of said silver halide emulsion layers comprising silver halide cubic grains that have the same or different composition in each silver halide emulsion layer, and all hydrophilic layers of said second radiographic silver halide film being fully forehardened and wet processing solution permeable for image formation within 45 seconds, and
- laminated to either said first or second fluorescent intensifying screen, a magenta filter having a density of at least 0.3 and that comprises a transparent support having disposed thereon a hydrophilic layer comprising at least one spectral absorbing material that absorbs radiation in the range of from about 500 to about 600 nm and is dispersed in a hydrophilic binder, said magenta filter being arranged so that its hydrophilic layer is in contact with said first or second fluorescent intensifying screen and its transparent support is adjacent said first or second radiographic silver halide film, respectively.
Dependencies are inferred from the claim text.