Method of providing digital image in radiographic film having visually adaptive contrast
US6190844A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 28, 2000 |
| Grant date | Feb 20, 2001 |
| Priority date | — |
| Expiry date | Feb 28, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C2200/58
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
High performance radiographic films exhibit visually adaptive contrast when imaged in radiographic imaging assemblies comprising an intensifying screen on both sides. These films have at least two silver halide emulsions (preferably tabular grains) on each side of a film support, and the emulsion closest to the film support on each side includes chemistry to control crossover. In addition, the films can be rapidly processed to provide the desired image whereby the upper scale contrast is at least 1.2 times the lower scale contrast. Thus, dense objects can be better seen at the higher densities of the radiographic image without any adverse sensitometric changes in the lower scale densities. These films have greater dynamic range that allows them to be scanned and digitized to correct for under- or over-exposure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.