Multicontrast radiographic film-screen assembly

摘要

The present invention relates to a symmetrical radiographic assembly comprising: a double side radiographic element which comprises a support and hydrophilic colloid layers coated on each side of said support, and an intensifying screen adjacent to each side of said radiographic element, wherein on each side of said support are coated at least two silver halide emulsion layers having a speed difference of at least 0.5 logE and an average contrast difference of at least 0.5, said at least two silver halide emulsion layers being each sensitized to a different region of the electromagnetic spectrum, wherein said intensifying screen comprises one or more different light emitting phosphors selected in order to have a radiation light emission having an emission maximum wavelength corresponding to at least one of said different regions of the electromagnetic spectrum to which said at least two silver halide emulsion layers are sensitized, and wherein said radiographic element shows an average contrast proportionally variable with the emission ratio of said light emitting phosphor(s).