EP0678780A2 - Film photographique à révélation rapide pour la radiographie médicale - Google Patents

Film photographique à révélation rapide pour la radiographie médicale Download PDF

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Publication number
EP0678780A2
EP0678780A2 EP95104533A EP95104533A EP0678780A2 EP 0678780 A2 EP0678780 A2 EP 0678780A2 EP 95104533 A EP95104533 A EP 95104533A EP 95104533 A EP95104533 A EP 95104533A EP 0678780 A2 EP0678780 A2 EP 0678780A2
Authority
EP
European Patent Office
Prior art keywords
silver halide
recording material
layers
emulsion layer
crystals
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP95104533A
Other languages
German (de)
English (en)
Other versions
EP0678780A3 (fr
Inventor
Thomas Dr. Müssig-Pabst
Manfred Arnfried Schmidt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Agfa Gevaert NV
Original Assignee
DuPont de Nemours Deutschland GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by DuPont de Nemours Deutschland GmbH filed Critical DuPont de Nemours Deutschland GmbH
Publication of EP0678780A2 publication Critical patent/EP0678780A2/fr
Publication of EP0678780A3 publication Critical patent/EP0678780A3/fr
Withdrawn legal-status Critical Current

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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
    • 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
    • G03C1/035—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein characterised by the crystal form or composition, e.g. mixed grain
    • 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
    • G03C1/46—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein having more than one photosensitive layer
    • 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
    • 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
    • G03C7/00—Multicolour photographic processes or agents therefor; Regeneration of such processing agents; Photosensitive materials for multicolour processes
    • G03C7/30—Colour processes using colour-coupling substances; Materials therefor; Preparing or processing such materials
    • G03C7/3022—Materials with specific emulsion characteristics, e.g. thickness of the layers, silver content, shape of AgX grains
    • G03C2007/3025—Silver content
    • 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
    • G03C2200/00—Details
    • G03C2200/27—Gelatine content
    • 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
    • G03C2200/00—Details
    • G03C2200/52—Rapid processing
    • 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
    • G03C5/26—Processes using silver-salt-containing photosensitive materials or agents therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
    • Y10S430/167—X-ray

Definitions

  • the invention relates to a rapidly processable photographic recording material for medical radiography, which is characterized by rapid processability and high sensitivity with very good photographic and physical properties.
  • photographic recording materials that contain at least one radiation-sensitive silver halide emulsion layer (hereinafter referred to as X-ray films) on both sides of a support are used in combination with intensifying screens; physical and photographic properties of the X-ray films determine their suitability for the reliable diagnosis of diseases by the radiologist.
  • X-ray films radiation-sensitive silver halide emulsion layer
  • intensifying screens physical and photographic properties of the X-ray films
  • the processing time of a photographic film depends crucially on the composition of the respective film, the structure and mode of operation of the respective film processor and the developer solution and fixer used in the film processor. All parameters, such as the dryer geometry and drying time of the film processor or the process water absorption of the corresponding photographic film, which influence the drying of the photographic films in the film processor, are of particular importance.
  • the processing time is defined as the time that an X-ray film in the standard format of 0.35 x 0.35 m edge length requires for the passage through a film winding machine, starting with the start of the X-ray film and ending with the complete release of the developed X-ray image. This period is also referred to in the literature as "nose to drop".
  • a silver halide photographic material is said to be rapidly processable if it can be processed in a film processor within 30 to 60 seconds.
  • Another way of reducing the processing time of X-ray films has been to reduce the swelling of the binder by means of stronger crosslinking.
  • this measure leads to a deterioration in the photographic properties such as gradation and maximum image blackness.
  • a simultaneous reduction in the application of binder and silver halide in the recording material leads to increased through-exposure and thus to poorer image sharpness of the image produced thereby. This can only be compensated for insufficiently by using filter dyes, since the filter dyes cannot be completely washed out with the desired short processing time and thus have a negative influence on the image color of the x-ray image produced in this way.
  • washable polymers contaminate the processor fluids and are therefore disadvantageous. Furthermore, such films with a low weight ratio of non-washable binder to silver have poor wet printing properties.
  • the previously proposed photographic recording materials for medical radiology which can be processed within 60 seconds, also have different sensitometric ones Data depending on the processing time. This is not desirable in the application, since different recording parameters are necessary for different processing speeds.
  • the object of the invention is to provide a photographic recording material for medical radiography which has very good photographic and physical properties, has an increased sensitivity at a given maximum achievable optical density and can be processed in a roll developing machine within 30 to 60 seconds.
  • Another aspect of the object is to provide a method for producing images using the rapidly processable silver halide recording materials with the aid of a film processor, the processing time being said to be between 30 and 60 seconds.
  • the upper limit for W is preferably 0.9.
  • a preferred lower limit for W is 0.6 for substantially spherical and / or approximately spherical and 0.45 for layers containing essentially plate-shaped silver halide grains.
  • the silver halide crystals in the silver halide emulsion can have a regular crystal shape such as, for example, cubes, octahedra or cubo-octahedra or a few regular shapes such as plates, single twins with (111) and / or (100) boundary surfaces or spheres. Furthermore, silver halide emulsions can also contain mixtures of at least two of these crystal forms.
  • silver halide crystals in which the average ratio of the smallest to the largest dimension (aspect ratio) is between 1.0: 1.1 and 1.0: 2.0 are considered to be approximately spherical.
  • Examples of such silver halide crystals are cubes, octahedra, cubo-octahedra and single twins with (111) and / or (100) boundary surfaces.
  • Spherical silver halide crystals have a ratio of smallest to largest dimension between 1.0: 1.1 and 1.0: 1.0.
  • Plate-shaped silver halide crystals have an aspect ratio of at least 1.0: 2.0.
  • the mean grain diameter of a spherical or approximately spherical silver halide emulsion is understood to mean the diameter of a sphere which is equal to the mean grain volume. This makes it possible to compare different grain shapes that represent approximately spherical silver halide crystals such as cubes, single twins with (111) and / or (100) boundary surfaces or octahedra both suitably with one another and with spherical silver halide crystals.
  • the average grain thickness of the plate-shaped silver halide crystals is suitable for defining the layer thickness of the elementary layer.
  • the grain thickness and edge length of the plate-shaped silver halide crystals can be determined, for example, by measuring recordings of such silver halide crystals produced with the aid of a scanning electron microscope.
  • the mean grain diameter of a silver halide emulsion can be measured with the aid of various methods, for example with the aid of electron microscope images of the corresponding emulsion.
  • the average grain volume of a silver halide emulsion can be determined using the method described in DE 20 25 147.
  • the layer thickness of the emulsion layer of a photographic material is controlled by the amount of silver and the amount of binder in the silver halide emulsion. It can be determined, for example, by viewing a cross section of the recording material to be examined using an electron microscope.
  • the layer thickness of the elementary layer of an emulsion layer is defined as equal to the diameter of a sphere equal to the average grain volume of the corresponding spherical or approximately spherical silver halide emulsion or equal to the grain thickness when using plate-shaped silver halide emulsions. If a mixture of at least two spherical and / or approximately spherical silver halide emulsions is used, the layer thickness of the elementary layer is defined accordingly as being equal to the diameter of a sphere which is the same as the mean grain volume of the corresponding spherical and / or approximately spherical silver halide emulsion.
  • the layer thickness of the elementary layer results from the sum of the mean grain thickness of the plate-shaped silver halide emulsion or emulsions and the mean diameter of one of the mean grain volume of the corresponding spherical and / or approximately spherical silver halide emulsion or emulsions of the same sphere, each multiplied by the value of the percentage by weight and divided by 100.
  • the smallest parameter W which can be used according to the invention depends on the weight ratio between plate-shaped and spherical and / or approximately spherical silver halide grains.
  • the number of elementary layers of a silver halide emulsion layer Ns is defined as the quotient of the layer thickness of the silver halide emulsion layer and the layer thickness of the elementary layer.
  • the total number of silver halide grains per unit area Ng is defined as the silver halide application per area divided by the product of the average grain volume and density of the silver halide grains.
  • the maximum possible number of silver halide crystals of the silver halide emulsion layer Nm which can be contained in a unit area of the elementary layer, is defined as the number of silver halide crystals whose projection areas together equal the area of the corresponding unit area.
  • the average largest possible projection area of the silver halide crystals is used to calculate Nm.
  • the projection areas of silver halide emulsion grains can be determined, for example, by measuring images of such emulsions made with the aid of electron microscopes.
  • a circular area with the average grain diameter of the emulsion can also be assumed as the average projection area for the calculation of Nm.
  • plate-shaped silver halide emulsions preference is given to those whose silver halide crystals have an average grain diameter between 0.8 ⁇ m and 2.0 ⁇ m and have an average ratio of grain diameter to grain thickness between 2: 1 and 7: 1.
  • the mean grain diameter of plate-shaped silver halide emulsions is defined as the diameter of the circle of the same area as the surface of an averaged plate surface.
  • the amount of binder applied is between 0.5 g / m 2 and 5.0 g / m 2 for silver halide emulsion layers, between 0.5 g / m 2 and 2.0 g / m 2 for protective layers and between 0.1 g / m 2 for intermediate layers. m 2 and 2.0 g / m 2 .
  • An application of hydrophilic binders in the silver halide emulsion layers according to the invention is preferred, so that the weight ratio of the application of hydrophilic binders in the silver halide emulsion layer, in which the parameter W has the characteristic value, to the silver application of the same silver halide emulsion layer is between 0.35 and 0.75 .
  • Silver coating is understood to mean the weight of silver in the form of its ions in the layers containing the silver halide crystals, based on the unit area of the silver halide photographic material.
  • the values for the silver application are given in grams / square meter and relate to the sum of all layers of the recording material containing silver halide.
  • the silver coating is usually in the range between 2.5 g / m 2 and 8 g / m 2 .
  • the rapidly processable silver halide recording material has a silver application of at least 4.9 g / m 2.
  • a silver application of at least 5.2 g / m 2 is particularly preferred.
  • the silver halide photographic material can contain several different layers on both sides of the substrate, such as, for example, adhesion-promoting layers, protective layers, intermediate layers, emulsion layers, antistatic layers and layers containing colorants.
  • the protective layer is the layer that is furthest away from the base and does not contain any silver halide.
  • such protective layers may also contain other substances which influence the chemical, physical and mechanical properties of the X-ray film. These substances include, for example, lubricants, surface-active substances containing perfluoroalkyl groups, latexes (polymeric organic particles), finely divided crystalline SiO 2 dispersions, matting agents (spacers), hardening agents, antistatic substances and preservatives.
  • alkaline digested bovine bone gelatin is preferably used as a protective colloid for the silver halide crystals in the emulsion layer and hydrophilic binder. This can be exchanged for ions.
  • hydrophilic binders can also be used in the various layers of the silver halide recording material.
  • hydrophilic binders are synthetic polymers such as polymers or copolymers of vinyl alcohol, N-vinylpyrrolidone, acrylamide, acrylic acid, Methacrylic acid, vinylimidazole, vinylpyrazole and natural polymers such as casein, gelatin (acid or alkaline digested, made from bovine bones or pigskins), cellulose and cellulose derivatives, alginates, albumin, starch, and modified polymers such as hydroxyethyl cellulose, hydrolyzed gelatin, chemically modified gelatin as described for example in EP-A 03 75 522, chemically modified and hydrolyzed gelatin as described for example in DE-B 21 66 605 and US-A 3,837,861.
  • the hydrophilic binder can be contained in the emulsion layers as well as in further auxiliary layers such as protective layers, adhesive layers or intermediate layers.
  • binders can be contained in the layers of the photographic recording material.
  • binders are matting agents or latexes (polymeric organic particles) which are introduced into the corresponding casting solution in the form of aqueous dispersions which are usually stabilized by wetting agents.
  • the photographic emulsions can be prepared from soluble silver salts and soluble halides by various methods.
  • Metal ions such as cadmium, zinc, thallium, mercury, iridium, rhodium and iron or their complexes may be present during the production and / or physical ripening of the silver halide emulsion.
  • the silver halide emulsion can contain silver halide crystals consisting of silver bromide, silver bromoiodide, silver chlorobromoiodide or silver chlorobromide.
  • a silver halide emulsion is preferably used which contains silver bromoiodide in a proportion of up to 3 mol% of iodide, based on the halide proportion.
  • the soluble salts are removed from the emulsion, for example by pasta and washing, by flaking and washing, by ultrafiltration or by means of ion exchange.
  • the silver halide emulsion is generally subjected to chemical sensitization under defined conditions - pH, pAg, temperature, gelatin, silver halide and sensitizer concentration - until the optimum sensitivity and fog are reached.
  • chemical sensitizers such as active gelatin, sulfur, selenium or tellurium compounds, salts or complexes of gold, platinum, rhodium, palladium, iridium, osmium, rhenium, ruthenium can be used alone or in combination. Procedures are described, for example, by H.
  • the layers containing hydrophilic binders can contain organic or inorganic hardening agents.
  • the hardening of a layer can also be effected by covering the layer to be hardened with a layer which contains a diffusible hardening agent, as is described, for example, in DE-A 38 36 945.
  • the curing agent can be added in the course of the preparation of emulsion solutions and / or casting solution for auxiliary layers. Another possible form of addition is to inject a solution of the hardening agent into at least one emulsion or casting solution while it is being transported from the storage kettle to the casting device.
  • suitable solvents for this are other water-miscible organic solvents such as ethanol, acetone, dimethyl sulfoxide or 1,4-dioxane.
  • suitable solvents for this are other water-miscible organic solvents such as ethanol, acetone, dimethyl sulfoxide or 1,4-dioxane.
  • substances or mixtures of substances can be present which adjust and / or buffer the pH value of the hardening agent solution.
  • chromium salts such as chromium alum
  • aldehydes such as formaldehy
  • An amount of hardener is preferably used which leads to a process water absorption of the rapidly processable silver halide recording material of less than 20 g / m 2 .
  • An amount of hardening agent which leads to a process water absorption of the rapidly processable silver halide recording material of less than 16 g / m 2 is particularly preferably used.
  • Spectral sensitizers such as cyanine dyes, merocyanine dyes, hemicyanine dyes, styryl dyes can be contained in the silver halide emulsion. It can be a spectral sensitivity sator alone or a combination.
  • the layers of the photographic recording material substances to stabilize the emulsion against fogging or for stabilizing other photographic properties, such as bromide, benzothiazolium salts, nitroindazoles, nitrobenzimidazoles, mercaptothiazoles, Mercaptohenzothiazole, mercaptobenzimidazoles, mercaptothiadiazoles, chlorobenzimidazoles, bromobenzimidazoles, aminotriazoles, benzotriazoles, nitrobenzotriazoles, mercaptopyrimidines, mercaptotriazines , Thioketo compounds such as oxazolinethione, azaindenes such as triazaindenes and tetrazaindenes such as the particularly preferred 5-hydroxy-7-methyl-1,3,4, -tetraazainden, and mercaptotetrazoles such as 1-phenyl-5-mercaptotetrazole alone or in combination with other substances in this group.
  • bromide be
  • the silver halide emulsion and the mixtures for producing the auxiliary layers can contain surface-active substances for various purposes, such as coating aids, to prevent electrostatic charging, to improve the sliding properties, to emulsify the dispersion, to prevent adhesion and to improve photographic characteristics (e.g. acceleration of development, high contrast, sensitization).
  • coating aids to prevent electrostatic charging, to improve the sliding properties, to emulsify the dispersion, to prevent adhesion and to improve photographic characteristics (e.g. acceleration of development, high contrast, sensitization).
  • non-ionic surfactants which contain oligo- or polyoxyalkylene groups, glycerol compounds and glycidol compounds, cationic surfactants, for example higher alkylamines, quaternary ammonium salts, pyridine compounds, and other heterocyclic compounds, Sulfonium compounds or phosphonium compounds, anionic surfactants containing an acid group, for example carboxylic acid, phosphoric acid, sulfuric acid ester or phosphoric acid ester group, ampholytic surfactants such as amino acid and aminosulfonic acid compounds and sulfur and phosphoric acid esters of an amino alcohol.
  • non-ionic surfactants which contain oligo- or polyoxyalkylene groups, glycerol compounds and glycidol compounds
  • cationic surfactants for example higher alkylamines, quaternary ammonium salts, pyridine compounds, and other heterocyclic compounds
  • Sulfonium compounds or phosphonium compounds Sulfonium compounds or phospho
  • the layers of the photographic material can contain filter dyes such as oxonol dyes, hemioxonol dyes, styryl dyes, merocyanine dyes, anthraquinone dyes, cyanine dyes, azomethine dyes, triarylmethane dyes, phthalocyanines and azo dyes.
  • filter dyes such as oxonol dyes, hemioxonol dyes, styryl dyes, merocyanine dyes, anthraquinone dyes, cyanine dyes, azomethine dyes, triarylmethane dyes, phthalocyanines and azo dyes.
  • the carrier of the photographic recording material can consist of a transparent and optionally blue-colored plastic film.
  • This plastic film can be produced, for example, from plastics such as polyethylene terephthalate, cellulose acetate, cellulose acetate butyrate, polystyrene or polycarbonate.
  • the surface of the carrier is preferably treated by a corona discharge before a first coating to improve the adhesion properties.
  • Various casting methods can be used to make the photographic material. Examples of this are curtain casting, cascade casting, dip casting, wash-on casting, slot casting. If necessary, several layers can be applied simultaneously.
  • the rapidly processable silver halide photographic material of the present invention also has a higher resolution, a better image color (blue silver image), an improved mechanical strength of the emulsion layer and a lower noise compared to the prior art.
  • the rapidly processable photographic silver halide recording material for medical radiography also advantageously has a comparable sensitometry after processing in 90 seconds or after rapid processing.
  • the emulsions were used together with a mixture to produce a protective layer located above the emulsion layer, essentially containing gelatin, and using formaldehyde as a hardening agent for the films VG1 and EG1 (spherical silver halide grains) and for the films with plate-shaped silver halide grains VT, ET1 and ET2 applied to a support that the values for W, the layer thickness, the silver coating (based on the silver contained in both emulsion layers) and the process water absorption values PWP described in Table 2 described in Table 1 were achieved.
  • the gelatin application of the protective layer was 1.0 g / m 2 on each side.
  • the number average of the grain diameter calculated as the average diameter of the spheres of equal volume to the silver halide grains, was measured using a device according to German patent DE 20 25 147.
  • M1 and M2 contained essentially plate-shaped silver halide crystals, M3 and M4 approximately.
  • Table 2 shows the measured values for process water absorption, system sensitivity and processing time. Furthermore, the evaluation of the properties silver color, resolution and noise after visual inspection is listed. The resolution is given as lines per millimeter and was determined by exposing the sample to be examined in an X-ray cassette with reinforcing foils to an X-ray through a corresponding template (lead grating), developing it in a film processor and visually searching for the number of lines that was just yet was dissolved.
  • the sensitometric data of the samples produced were obtained by standardized exposure and processing in a roll developing machine using the developer described above and a fixing bath.
  • the values for the gradient of the samples did not differ by more than 10%, while the measured maximum density values averaged 3.8 with deviations of less than 6%.
  • Tables 3 and 4 show the comparable sensitometry of the respective samples according to the invention with a processing time of 90 and 53 seconds.

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  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
EP95104533A 1994-04-11 1995-03-28 Film photographique à révélation rapide pour la radiographie médicale. Withdrawn EP0678780A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4412369A DE4412369A1 (de) 1994-04-11 1994-04-11 Schnellverarbeitbares photographisches Aufzeichnungsmaterial für die medizinische Radiographie
DE4412369 1994-04-11

Publications (2)

Publication Number Publication Date
EP0678780A2 true EP0678780A2 (fr) 1995-10-25
EP0678780A3 EP0678780A3 (fr) 1996-10-23

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EP95104533A Withdrawn EP0678780A3 (fr) 1994-04-11 1995-03-28 Film photographique à révélation rapide pour la radiographie médicale.

Country Status (4)

Country Link
US (1) US5536631A (fr)
EP (1) EP0678780A3 (fr)
JP (1) JPH0843989A (fr)
DE (1) DE4412369A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0308193A2 (fr) * 1987-09-14 1989-03-22 Konica Corporation Matériau photographique à l'halogénure d'argent sensible à la lumière
EP0543319A1 (fr) * 1991-11-20 1993-05-26 Konica Corporation Matériau photographique couleur à l'halogénure d'argent sensible à la lumière
EP0559061A2 (fr) * 1992-03-06 1993-09-08 Minnesota Mining And Manufacturing Company Procédé de traitement d'un élément radiographique à l'halogénure d'argent

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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JPH0843989A (ja) 1996-02-16
US5536631A (en) 1996-07-16
EP0678780A3 (fr) 1996-10-23

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