EP0790526B1 - Système pellicule-écran formant image radiographique - Google Patents

Système pellicule-écran formant image radiographique Download PDF

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Publication number
EP0790526B1
EP0790526B1 EP97200143A EP97200143A EP0790526B1 EP 0790526 B1 EP0790526 B1 EP 0790526B1 EP 97200143 A EP97200143 A EP 97200143A EP 97200143 A EP97200143 A EP 97200143A EP 0790526 B1 EP0790526 B1 EP 0790526B1
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EP
European Patent Office
Prior art keywords
light
layer
silver halide
screen
dye
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EP97200143A
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German (de)
English (en)
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EP0790526A1 (fr
Inventor
Marc Van Den Zegel
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Agfa Gevaert NV
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Agfa Gevaert NV
Agfa Gevaert AG
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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
    • G03C5/16—X-ray, infrared, or ultraviolet ray processes
    • G03C5/17—X-ray, infrared, or ultraviolet ray processes using screens to intensify X-ray images
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00—Photosensitive materials
    • G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
    • G03C1/0051—Tabular grain emulsions
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00—Photosensitive materials
    • G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
    • G03C1/0051—Tabular grain emulsions
    • G03C2001/0055—Aspect ratio of tabular grains in general; High aspect ratio; Intermediate aspect ratio; Low aspect ratio

Definitions

  • This invention relates to a radiographic image forming screen-film system of at least one intensifying screen and a light-sensitive silver halide photographic material in operative association therewith.
  • phosphors present in an intensifying screen convert X-ray radiation into visible light. The photons of visible light emitted from said phosphors are then absorbed by adjacent radiographic film material containing light-sensitive silver halide emulsion crystals.
  • suitable screen-film systems usually contain only one screen.
  • Light-sensitive silver halide photographic layer(s) coated at only one side of a film support are used in this application, wherein the outermost layer of said film should be in close contact with the said screen in favour of sharpness.
  • the screen-film system contains two screens. Between the said screens the film is positioned and comprises on each side of the support at least one light-sensitive silver halide photographic layer.
  • tabular silver halide emulsion crystals are frequently used nowadays.
  • Tabular grains are disclosed e.g. in US-P 4,414,304 for their high covering power and developability and in US-Patents 4,425,425 and 4,425,426 for their lower cross-over. All these effects are the result of a higher surface to volume ratio characteristic for said tabular grains.
  • Said higher surface to volume ratio also provides adsorption of higher amounts of spectral sensitising dyes, offering the advantage of absorption of more incident light, thereby reducing cross-over.
  • tabular grains Another unacceptable disadvantage of tabular grains is the yellow-brown colour of the developed silver after processing, especially when said grains have a thickness of less than 0.30 ⁇ m. For thinner tabular grains even a more tremendous deterioration from the desired black image tone is observed, especially when the image is examined in transparancy as well as under reflected light conditions.
  • EP-A 0 468 211 and in EP-A 0 655 645 Therein a blue coloured pigment is added to the photographic sensitive layer or another layer of the film in order to reduce residual dye stain and to provide a black image tone. This blue pigment is characterised by an absorption maximum of from 570 to 630 nm and from 640 to 700 nm respectively. In the examples of EP-A's 0 468 211 and 0 655 645 this pigment is added to the light-sensitive emulsion layer containing silver halide emulsion crystals.
  • an image-forming film-screen system for medical diagnostic imaging comprising a light-sensitive silver halide photographic film material in operative association with at least one intensifying screen comprising on a support a layer of a visible light emitting luminescent phosphor, the said film material comprising a support and on at least one side thereof a light-sensitive silver halide emulsion layer having spectrally sensitised tabular silver halide and a non-light-sensitive protective layer, wherein said protective layer contains a polymeric compound selected from the group consisting of gelatin, a synthetic, semi-synthetic or natural substitute for gelatin and latex (co)polymers, in an amount of at least 0.4 g per m 2 ; characterised in that between a light-sensitive silver halide emulsion layer and said protective layer there is an intermediate layer comprising a blue coloured pigment in dispersed form, having a solubility in isopropanol at 25°C of less than 10 mg per litre.
  • Isopropanol is normally used as a screen cleaner.
  • At least said protective antistress layer and, if present, said afterlayer contains a polymeric compound in an amount of at least 0.2 g per m 2 and more preferably at least 0.4 g/m 2 .
  • Said protective antistress layer may be composed of two different layers, the layer more close to the support acting as an intermediate layer comprising said blue dye(s) in dispersed form. Said two different layers may have the same composition, except for the presence of said blue dye(s) in dispersed form.
  • said polymeric compound is a compound selected from the group consisting of gelatin, a synthetic, semi-synthetic or natural substitute for gelatin, and latex (co)polymers.
  • the presence of (additional) amounts of (natural or synthetic) clay and/or colloidal silica is further highly appreciated in favour of physical surface characteristics as such as glare, slidability, etc.
  • Gelatin is well-known as an essential polymeric compound of hydrophilic colloid layers in photographic materials.
  • Synthetic substitutes for gelatin are e.g. polyvinyl alcohol, poly-N-vinyl pyrrolidone, polyvinyl imidazole, polyvinyl pyrazole, polyacrylamide, polyacrylic acid, and derivatives thereof, in particular copolymers thereof.
  • Natural substitutes for gelatin are e.g. other proteins such as zein, albumin and casein, cellulose, saccharides, starch, and alginates.
  • the semi-synthetic substitutes for gelatin are modified natural products e.g.
  • gelatin derivatives obtained by conversion of gelatin with alkylating or acylating agents or by grafting of polymerisable monomers on gelatin, and cellulose derivatives such as hydroxyalkyl cellulose, carboxymethyl cellulose, phthaloyl cellulose, and cellulose sulphates.
  • Gelatin can be lime-treated or acid-treated gelatin.
  • the preparation of such gelatin types has been described in e.g. "The Science and Technology of Gelatin", edited by A.G. Ward and A. Courts, Academic Press 1977, page 295 and next pages.
  • the gelatin can also be an enzyme-treated gelatin as described in Bull. Soc. Sci. Phot. Japan, N° 16, page 30 (1966).
  • latex (co)polymers used in the film material used in the film-screen system according to this invention have been described in e.g. Research Disclosure 19551, July 1980, in EP-A's 0 452 568; 0 534 006; 0 558 196 and 0 643 326; in US-P's 3,443,946; 3,589,908; 3,640,721; 4,476,218 and 4,810,624 and in JP-A 06 250 315.
  • Especially preferred latex polymers are e.g. latex containing polyacrylic acid as described in JP-A 05 134 336 and in EP-A 0 644 456.
  • Clays set forth hereinbefore are disclosed e.g. in EP-A 0 644 454, wherein i.a. particular synthetic clays have been described, which are very suitable to reach good surface characteristics.
  • colloidal silica as disclosed in e.g. EP-A 0 670 517 is added to the coating solution(s) of the protective antistress layer and/or to an afterlayer, if present.
  • gelatin-grafted polymer particles as disclosed e.g. in US-P's 5,393,650 and 5,426,020 or matte polymeric particles covalently bound to gelatin and colloidal silica as disclosed in US-P 5,300,411 are added to the coating solution(s) of the protective antistress layer and/or to an afterlayer, if'present.
  • Said polymeric matting particles may be covered by a layer of colloidal inorganic particles as described in e.g. in US-P's 5,288,598 and 5,378,577.
  • Organic polymer particles as described in e.g. US-P's 4,914,012 and 5,342,733 may also be added as well as matting agents described in e.g. JP-A 04 162 032.
  • Lubricants may further be added as described e.g. in US-P 4,766,059 and in JP-A 05 107 687.
  • said blue coloured pigment present in dispersed form in an intermediate layer between emulsion layer and protective layer has a maximum absorption in the visible wavelength region from 570 to 700 nm and more preferred in the visible wavelength region from 570 to 630 nm as especially green-emitting screens are preferred in the film-screen system according to this invention in favour of reduced cross-over and sharpness.
  • Preferred blue coloured dyes are selected from the group consisting of phthalocyanine dyes and indanthron dyes as illustrated in the Examples hereinafter. It is clear that a mixture of blue coloured pigments can be used, the proviso that at least one of these pigments has a maximum absorption in the visible range of the wavelength spectrum from 570 to 700 nm, and more preferred in the range from 570 to 630 nm, and that the solubility of said dyes is less than 10 mg per litre in isopropanol at 25°C. In principle pigments or dyes having a maximum absorption for said wavelength values fulfilling the solubility conditions set forth hereinbefore can additionally be added to the coating layers of the material as e.g. magenta coloured dyes for use as "colour correcting dyes".
  • said blue pigment(s) is (are) present in an intermediate layer coated between an emulsion layer situated farther from the film support than any other emulsion layer, if present, and a protective antistress layer in an amount of from 1 mg/m 2 to 100 mg/m 2 , and more preferably in an amount of from 1 mg/m 2 to 50 mg/m 2 .
  • Said blue pigments are preferably dispersed by the methods described e.g. in EP-A 0 569 074 and in EP-Application EP-A-0756201 filed July 24, 1995. Further dispersion techniques which may be applied have been described in e.g. EP-A's 0 552 646 and 0 595 821 and in US-P 4,900,652.
  • Preferred mean particle sizes of the dispersed pigments are not more than 2 ⁇ m, more preferably not more than 1 ⁇ m and most preferably not more than 0.5 ⁇ m.
  • light-sensitive spectrally sensitised tabular silver halide grains are used in at least one emulsion layer, wherein said tabular grains have an aspect ratio of from 2 to 20, a thickness from 0.06 to 0.30 ⁇ m, more preferably from 0.08 to 0.22 ⁇ m and wherein said grains account for at least 50 %, more preferably at least 70 % and even more preferably at least 90 % of the total projective area of all grains.
  • aspect ratios of said tabular grains are from 5 to 20 and the said thickness of the grains is varying from 0.08 to 0.25 ⁇ m.
  • a preferred variation coefficient of less than 0.30, more preferred less than 0.20 and still even more preferred from 0.10 to 0.15 is highly appreciated. Such low variation coefficient can be attained by application of methods described in e.g. US-P's 5,147,772; 5,147,773; 5,171,659; 5,210,013 and 5,215,879.
  • Silver halide compositions of said tabular grains can be silver bromide, silver bromoiodide, silver chloride, silver chlorobromide, silver chloroiodide or silver chlorobromoiodide.
  • Halide ions may be divided homogeneously or heterogeneously over the grain volume, dependent on the preparation method used. Preparation methods for tabular grain emulsions have been described e.g. in EP-A 0 569 075 (in a gelatinous dispersing medium), in EP-A 0 677 773 (in colloidal silica) and in Research Disclosures 22534, January 1983; 232012, August 1983 and 36544, September 1994, i.a. in part I (Emulsion grains and their preparation).
  • Coated amounts of silver in the silver halide emulsion layer(s) of the film material used in the system according to this invention are in the range from 2 to 6 g/m 2 , and more preferably, from 3 to 5 g/m 2 and per side, expressed as an equivalent amount of silver nitrate.
  • Vehicles, vehicle extenders, vehicle-like addenda and vehicle related addenda which may be used in the context of this invention can be found in the same RD 36544, part II. Washing procedures for said emulsions can be applied as described in part III of the said RD. Emulsions used in the film material used in the system according to this invention may be chemically sensitised as described in RD 36544, chapter IV.
  • said light-sensitive tabular silver halide grains are spectrally sensitised to the blue or to the green region of the wavelength spectrum, the green region however being preferred.
  • Spectral sensitisers used therefor have been described in RD 22534, January 1983, in RD 36544, chapter V, in EP-Application EP-A-0757285, filed August 1, 1995, in EP-A's 0 752 617, 0 712 036, 0 712 034, 0 105 425, 0 144 091, 0 300 332, 0 487 010, 0 677 773 and 0 678 772 and in US-P's 4,942,121 and 5,108,887.
  • Development acceleration in order to enhance speed in the same processing cycle or in order to maintain speed in a shorter developing time can be accomplished by incorporating in the emulsion layer or adjacent layers various compounds, preferably polyoxyalkylene derivatives having a molecular weight of at least 400 such as those described in e.g. US-P's 3,038,805; 4,038,075 and 4,292,400 or development accelerators described in EP-A's 0 634 688 and 0 674 215.
  • UV absorbing dyes, optical brighteners and luminescent dyes can be used as described in RD 36544, chapter VI.
  • Antifoggants and stabilisers can be used as described in the same RD, chapter VII.
  • useful absorbing dyes used as antihalation dyes are summarised. Further useful filter dyes have been described e.g. in EP-A's 0 656 401 and 0 724 191 and BE-A-1007901, filed December 22, 1993.
  • Coating physical property modifying addenda like coating aids, plasticisers, lubricants, antistats and matting agents useful in the preparation of the coating solutions of the light-sensitive and non-light sensitive film layers are further described in RD 36544, chapter IX.
  • the gelatin binder of the radiographic film materials used in the system according to the present invention can be hardened with appropriate hardening agents such as those of the epoxide type, those of the ethylenimine type, those of the vinylsulfone type e.g.
  • aldehydes like e.g. formaldehyde, glyoxal, and glutaric aldehyde
  • N-methylol compounds e.g. dimethylolurea and methyloldimethylhydantoin
  • dioxan derivatives e.g. 2,3-dihydroxy-dioxan
  • 1,3,5-triacryloyl-hexahydro-s-triazine active halogen compounds e.g. 2,4-dichloro-6-hydroxy-s-triazine, and mucohalogenic acids e.g. mucochloric acid and mucophenoxychloric acid.
  • These hardeners can be used alone or in combination.
  • the binder can also be hardened with fast-reacting hardeners such as carbamoylpyridinium salts as disclosed in US-P 4,063,952 and with the onium compounds as disclosed in EP-A 0 408 143.
  • the binder should dispose of an acceptably high number of functional groups, which by reaction with an appropriate hardening agent can provide a sufficiently resistant layer.
  • Such functional groups are especially amino groups, but also carboxylic groups, hydroxy groups, and active methylene groups.
  • a water absorption per gram of gelatin is not more than 3 g per gram of gelatin and even more preferred a water absorption of not more than 2 g per gram of gelatin.
  • Said amount of water absorption is determined after incubating a sample of said film material at 57 °C and 34% RH for 3 days, weighing said sample, immersing it in distilled water at 21°C for 3 minutes, squeezing it in order to get a surface free from water drops and weighing it again. Calculation of the differences in weight, divided by the surface area of the film strip and by the amount of gelatin coated per square metre gives the required value.
  • Another more suitable way to express the requirement to sufficiently harden the binder in the film material used in the screen-film system of this invention is to express it as atempoual swelling degree: the saidtempoual swelling degree, should not exceed a value of 300 %, and more preferably should not exceed a value of 200 %. Therefore after incubating a sample of a material at 57 °C and 34% RH for 3 days the thickness (a) of the layer assemblage is measured. Thereafter the sample is immersed in distilled water at 21°C for 3 minutes and the thickness (b) of the swollen layer is measured.
  • the swelling ratio is then calculated as: (b-a)/a x 100 (%).
  • Layers and layer arrangements which can be applied to the film material in the system according to this invention are those described in EP-A's 0 752 617, 0 712 036, 0 712 034, 0 677 773, 0 678 772, 0 610 608; 0 610 609 and in EP-A 0 569 075, in US-P's 4,092,168 and 4,311,787; in DE 2,453,217 and in GB Patent 7,907,440.
  • Supports and subbing layers coated adjacent thereto, useful for the film materials in the system according to this invention, can be those as described in RD 36544, chapter XV, polyethylene naphthalate inclusive.
  • a useful subbing layer is disclosed e.g. in JP-A 01 166 031.
  • Vinylidene chloride and styrene-butadiene copolymers are the most well-known polymers for practical use as subbing layer ingredient in the film material of the screen-film system of this invention.
  • Antistatic agents can be provided therein as e.g. in US-P 5,391,472.
  • a preferred screen in the screen-film system is an intensifying screen comprising a green light-emitting luminescent phosphor, and more preferred a Gd 2 O 2 S:Tb luminescent phosphor.
  • a screen or a combination of screens can be used as has been described e.g. in EP-A's 0 592 724, 0 510 754, 0 647 253 and 0 648 254.
  • symmetrical or asymmetrical film arrangement refers to film materials wherein sensitivity, gradation and/or spectral sensitivity is equal or not at opposite sides of the film support.
  • symmetrical or asymmetrical pair of screens refers to screens wherein speed and/or spectral sensitivity is equal or not for both screens.
  • the photographic material containing spectrally sensitised tabular grains used in the system according to the present invention is image-wise exposed to visible light, preferably green light, generated from converted X-rays emitted by an X-ray source emitting X-rays with an energy adapted to the specific application. Conversion of X-rays proceeds by the preferred green light-emitting phosphors making part of the screens of the image forming film-screen system according to this invention.
  • processing conditions and composition of processing solutions after image-wise exposure of the film material for use in the system according to this invention are dependent from the specific type of photographic material in which the spectrally sensitised tabular grains are applied.
  • materials for X-ray diagnostic purposes said materials are adapted to rapid processing conditions.
  • an automatically operating processing apparatus is used provided with a system for automatic regeneration of the processing solutions.
  • the forehardened material may be processed using one-part package chemistry or three-part package chemistry. Applications within total processing times of 30 seconds and even shorter up to processing times of 120 seconds, known as common praxis, are possible. From an ecological point of view it is even possible to use sodium thiosulphate instead of ammonium thiosulphate in the fixer solution.
  • Useful processing compositions in the processing of films used in the system according to this invention have been described in EP-A 0 542 354.
  • the milling procedure was stopped when a mean particle size of 0.6 ⁇ m was obtained.
  • a blue dyed polyethylene terephthalate film support of 175 ⁇ m thickness was used.
  • the crystals of the thus obtained tabular grain emulsion, containing 75 grams of gelatin per mole of AgNO 3 had the following characteristics, determined according to the method described in US-Patent 4,414,304:
  • This emulsion was chemically sensitised in the presence of anhydro-5,5'-dichloro-3,3'-bis(n.sulfobutyl)-9-ethyloxacarbocyanine hydroxide, chloro auric acid, sodium thiosulphate and potassium thiocyanate.
  • demineralised water To 800 ml of demineralised water were added: 44 g of gelatin and 44 g of a solution, 30% by weight, of KIESELSOL 300F (trademarketed product from Bayer AG, Leverkusen, Germany). Demineralised water was added to obtain the appropriate wet coating thickness and the desired amount of gelatin per m 2 .
  • Demineralised water was added to obtain the appropriate wet coating thickness and the desired amount of gelatin per m 2 .
  • demineralised water was added to 800 ml of demineralised water: 44 g of gelatin; 44 g of a solution (30% by weight) of KIESELSOL 300F, 1.84 g of poly methyl methacrylate (average particle diameter: 3.5 ⁇ m); 0.6 g of ammoniumperfluorocaprylate and 21.6 g of a solution (37% by weight) of formaldehyde.
  • Demineralised water was added to obtain the appropriate wet coating thickness and the desired amount of gelatin per m 2 .
  • the materials were obtained by coating at 38°C, on the support provided with a subbing layer at both sides, the above described coating solutions for the emulsion layer, the intermediate and/or the protective (outermost antistress) layer respectively. Said materials were dried under controlled conditions of humidity and temperature, said temperature never exceeding 30°C.
  • the emulsion layer, intermediate layer (if present) and protective layer were coated simultaneously by the slide hopper coating technique with the emulsion layer in direct contact with the subbing layer, the intermediate layer thereupon and as an outermost layer of the material the protective (antistress) layer. Before drying the thickness (known as "wet thickness") of the emulsion layer was 44 ⁇ m. Per m 2 and per side of the support the emulsion layer contained an.
  • Samples of the photographic materials were exposed using a continuous wedge with green light of 540 nm during 0.1 seconds and were processed in a 45 seconds cycle of a CURIX HT530 (Agfa-Gevaert trademarked name) processor.
  • CURIX HT530 Agfa-Gevaert trademarked name
  • G138 developer and G334 fixer both trademarked names from Agfa-Gevaert, were used as processing chemicals.
  • log E The density as a function of the light dose (log E) was then measured and the log E value at a density of 1.00 above fog was determined. This value was representing the sensitivity of the material. A more sensitive material has a lower log E value (requires a lower light dose).
  • the colour of the developed Ag, viewed by incident light was measured as CIELAB values: L, a*, b*.
  • the X-ray screen (format 24 cm x 30 cm) was made slightly wet with Agfa-Gevaert Curix "screen-cleaner".
  • Screen-cleaner mainly consists of isopropanol.
  • the X-ray screen used in this dye stain test was CURIX ORTHO REGULAR 1FFJ5P (trademarketed screen by Agfa-Gevaert NV).
  • Example 1 shows the importance of the location of the blue coloured dyes in the material. Therefore materials Nos. 1 to 4 were coated as follows:
  • Material No. 1 was obtained by coating support 1 as described above with the coating solution of protective layer 1, coated at a wet thickness of 25 ⁇ m and at a gelatin content per m 2 and per side of the support of 1.1 g. No intermediate layer was coated.
  • Material No. 2 was coated just as Material No. 1, except for the use of support 2 instead of support 1 as a support and for the addition of 4.1 g of a dispersion of dye A to the coating solution of the emulsion layer.
  • the coated material contained 9.2 mg/m 2 and per side of dye A in the emulsion layer.
  • Material No. 3 was coated as Material No. 2, except for the addition of 3.7 g of a dispersion of dye A which was added to the coating solution of the protective layer 1. This material thus contained 9.2 mg/m 2 and per side of dye A in the protective layer.
  • Material No. 4 comprises an intermediate layer coated at a wet thickness of 12.5 ⁇ m. Adjacent thereto and farther from the support the protective layer 2 was coated, also at a wet thickness of 12.5 ⁇ m. The gelatin content per m 2 of the intermediate and the protective layer was 0.55 g for both. An amount of 7.4 grams of a dispersion of dye A was added to the coating solution of the intermediate layer. This material thus contained 9.2 mg/m 2 and per side of dye A, said dye being located in the intermediate layer.
  • Example 2 shows the necessity to use blue dyes having a low solubility in isopropanol. Therefore Materials Nos. 5 to 8 were additionally coated:

Claims (10)

  1. Système de film-écran de formation d'image pour l'imagerie diagnostique médicale, comprenant un matériau en film photographique photosensible à l'halogénure d'argent en association opérante avec au moins un écran renforçateur comprenant sur un support une couche de luminophore émettant dans le spectre de la lumière visible, ledit matériau en film comprenant un support et, sur au moins un de ses côtés, une couche d'émulsion photosensible à l'halogénure d'argent comportant de l'halogénure d'argent tabulaire soumis à une sensibilisation spectrale et une couche de protection non photosensible, dans lequel ladite couche de protection contient un composé polymère choisi parmi le groupe constitué par la gélatine, un substitut synthétique, semi-synthétique ou naturel pour la gélatine et des (co)polymères de latex, en une quantité d'au moins 0,4 g par m2, caractérisé en ce qu'on prévoit, entre la couche d'émulsion photosensible à la lumière d'argent et ladite couche de protection, une couche intermédiaire comprenant un pigment coloré en bleu sous une forme dispersée, dont la solubilité dans l'isopropanol à 25 °C est inférieure à 10 mg par litre.
  2. Système selon la revendication 1, dans lequel ledit pigment coloré en bleu sous une forme dispersée possède une absorption maximale dans la gamme de longueurs d'ondes visibles de 570 à 700 nm.
  3. Système selon la revendication 1 ou 2, dans lequel ledit pigment coloré en bleu sous une forme dispersée possède une absorption maximale dans la gamme de longueurs d'ondes visibles de 570 à 630 nm.
  4. Système selon l'une quelconque des revendications 1 à 3, dans lequel ledit pigment coloré en bleu est un pigment ou un colorant choisi parmi le groupe constitué par des colorants de phtalocyanine et des colorants d'indanthrone.
  5. Système selon l'une quelconque des revendications 1 à 4, dans lequel ledit pigment coloré en bleu est présent dans ladite couche intermédiaire en une quantité de 1 mg/m2 à 100 mg/m2.
  6. Système selon l'une quelconque des revendications 1 à 3, dans lequel la granulométrie moyenne dudit pigment coloré en bleu sous une forme dispersée n'est pas supérieure à 0,5 µm.
  7. Système selon l'une quelconque des revendications 1 à 6, dans lequel lesdits grains tabulaires photosensibles à l'halogénure d'argent possèdent un rapport nominal d'aspect de 2 à 20, une épaisseur de 0,06 à 0,30 µm et interviennent à concurrence d'au moins 50 % de l'aire de projection totale de tous les grains et sont soumis à une sensibilisation spectrale dans la région verte du spectre de longueurs d'ondes.
  8. Système selon l'une quelconque des revendications 1 à 7, dans lequel ledit écran est un écran renforçateur comprenant au moins un luminophore émettant dans la région verte du spectre.
  9. Système selon l'une quelconque des revendications 1 à 3, dans lequel ledit luminophore émettant dans la région verte du spectre est un luminophore Gd2O2S:Tb.
  10. Matériau en film photographique photosensible à l'halogénure d'argent tel que défini dans l'une quelconque des revendications 1 à 7.
EP97200143A 1996-02-19 1997-01-17 Système pellicule-écran formant image radiographique Expired - Lifetime EP0790526B1 (fr)

Priority Applications (1)

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EP97200143A EP0790526B1 (fr) 1996-02-19 1997-01-17 Système pellicule-écran formant image radiographique

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EP96200417 1996-02-19
EP96200417 1996-02-19
EP97200143A EP0790526B1 (fr) 1996-02-19 1997-01-17 Système pellicule-écran formant image radiographique

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EP0790526A1 EP0790526A1 (fr) 1997-08-20
EP0790526B1 true EP0790526B1 (fr) 2002-07-24

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EP97200143A Expired - Lifetime EP0790526B1 (fr) 1996-02-19 1997-01-17 Système pellicule-écran formant image radiographique

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