Radiation oncology treatment portal imaging film and method of use
AssigneeEastman Kodak Company
InventorsRobert E. Dickerson, William E. Moore
Life of this patent
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Abstract
Radiographic films containing cubic grain, high silver chloride emulsions can be used in radiographic imaging assemblies comprising intensifying screens for therapy portal localization imaging. The average silver halide grain size is from about 0.1 to about 0.18 μm and the silver halide is free of silver halide dopant compounds. These films provide excellent contrast with improved exposure latitude (at least 4:1 when measured at a gamma value of 1.5) for use in various exposure conditions and equipment.
Claims19
A radiographic silver halide film intended for portal localization imaging comprising a support having first and second major surfaces and that is capable of transmitting X-radiation,
- said film having disposed on said first major support surface, one or more hydrophilic colloid layers including a silver halide emulsion layer, and on said second major support surface, one or more hydrophilic colloid layers including a silver halide emulsion layer,
- said silver halide emulsion layers independently comprising silver halide cubic grains that (a) have the same or different composition in each silver halide emulsion layer, (b) have an average grain size of from about 0.1 to about 0.18 μm, and (c) are composed of at least 70 mol % chloride, up to 30 mol % bromide, and up to 2 mol % iodide, based on total silver, and
- all hydrophilic layers of said film being fully forehardened and wet processing solution permeable for image formation within 45 seconds, and
- said film being free of all silver halide dopants,
- wherein said film exhibits an exposure latitude of at least 4:1 when measured at a gamma value of 1.5.
Dependencies are inferred from the claim text.