摘要:
In a photostimulable storage phosphor screen or panel wherein said screen comprises storage phosphor particles dispersed in a binder and wherein said particles have a particle size distribution having a d99 which is not more than 15 μm, said d99 expressing a grain size limit above which not more than 1% by weight of phosphor powder particles is present in said phosphor powder, its structure noise parameter DQE2rel exceeds a value of 0.70 and a ratio of d99 (expressed in μm) and DQE2rel is not more than 25:1, wherein DQE2rel is the ratio of the DQE2 obtained at a dose of 22 mR to the DQE2 obtained at a dose of 3 mR, as expressed in formula (I) DQE2rel=DQE2(22 mR))/DQE2(3 mR) (I) which is representative for an amount of screen-structure noise produced by said screen or panel in the complete spatial frequency range.
摘要:
In a photostimulable storage phosphor screen or panel wherein said screen comprises storage phosphor particles dispersed in a binder and wherein said particles have a particle size distribution having a d99 which is not more than 15 μm, said d99 expressing a grain size limit above which not more than 1% by weight of phosphor powder particles is present in said phosphor powder, its structure noise parameter DQE2rel exceeds a value of 0.70 and a ratio of d99 (expressed in μm) and DQE2rel is not more than 25:1, wherein DQE2rel is the ratio of the DQE2 obtained at a dose of 22 mR to the DQE2 obtained at a dose of 3 mR, as expressed in formula (I) DQE2rel=DQE2(22 mR))/DQE2(3 mR) (I) which is representative for an amount of screen-structure noise produced by said screen or panel in the complete spatial frequency range.
摘要:
In a photostimulable storage phosphor screen or panel wherein said screen comprises storage phosphor particles dispersed in a binder and wherein said particles have a particle size distribution having a d99 which is not more than 15 μm, said d99 expressing a grain size limit above which not more than 1% by weight of phosphor powder particles is present in said phosphor powder, its structure noise parameter DQE2rel exceeds a value of 0.70 and a ratio of d99 (expressed in μm) and DQE2rel is not more than 25:1, wherein DQE2rel is the ratio of the DQE2 obtained at a dose of 22 mR to the DQE2 obtained at a dose of 3 mR, as expressed in formula (I) DQE2rel=DQE2(22 mR))/DQE2(3 mR) (I) which is representative for an amount of screen-structure noise produced by said screen or panel in the complete spatial frequency range.
摘要:
A photostimulable storage phosphor screen or panel suitable for use in mammographic applications comprises on a support, a storage phosphor layer and, adjacent thereto, an outermost top-coat layer, wherein said top-coat layer has a roughness profile such that an average spacing between peaks as measured by means of a stylus profiler over and along its scan-distance, is less than 250 μm.
摘要:
A radiographic silver halide film material and a radiographic screen/film combination has been disclosed, said material having in at least one light-sensitive layer thereof an emulsion comprising {111} tabular silver halide grains rich in silver bromide, spectrally sensitive to irradiation in the wavelength range between 540 and 555 nm by the presence of a combination of at least one J-aggregating spectrally sensitizing cyanine dye according to the formula (I) and of at least one additional cyanine dye providing a shift of maximum absorption wavelength of said combination of less than 10 nm versus in the absence thereof, wherein said additional cyanine dye is at least one monomethine cyanine dye according to the formula (II), essentially having a solubilizing group or a latent solubilizing group, said dyes having been given in the description and in the claims of the present invention.
摘要:
A method has been described for preparing an ultrathin tabular grain emulsion rich in silver bromide, having {111} major faces, wherein tabular grains having a thickness of less than 0.08 &mgr;m exhibit an average aspect ratio of more than 5:1 and account for at least 75% by number of hexagonal grains and a coefficient of variation on average equivalent surface area of less than 0.50. The process is characterized in that during formation, (a) pH is maintained from 0.8 to 10; (b) a gelatino-peptizer is present in a concentration of 0 to 50 g per liter of dispersing medium, and (c) pBr having a value of at least 1.8 is maintained during grain nucleation and pBr is maintained at less than 2.4 during growth provided that a gelatin peptizer which is free from calcium ions and has a methionine content of less than 30 micromoles per gram of gelatino-peptizer is present.