Nova Patents
EP1136879A1

Radiographic imaging system and silver halide photographic material

Abstract

An radiographic imaging system for making a radiograph by a radiography apparatus using a photographic combination of a silver halide photographic material having light sensitive layers on both sides of the support and an intensifying screen is disclosed, wherein the photographic material exhibits a cross-over of not more than 15%, a specified point gamma value within the specified density range on the characteristic curve when the photographic combination is exposed to X-ray, and wherein the radiography apparatus conducts making a radiograph under the condition that a distance between a focal point of an X-ray tube and the photographic combination is 1.0 to 3.0 m and a distance between an object and the photographic combination is 0.2 to 1.5 m.

EP1136879A1, drawing sheet 1
Sheet 1 of 15

Term

Term ended

Projected expiry passed 7 March 2021, 5.5 years ago.

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14 claims: 6 independent, 8 dependent

  1. 1
    A silver halide photographic light sensitive material which is combined with at least an intensifying screen to form a photographic combination for use in a radiographic imaging system for making a radiograph by a radiography apparatus, wherein the photographic material comprises a support having a light sensitive silver halide emulsion layer on each of both sides of the support, exhibiting a cross-over of not more than 15%, a point gamma of 1.8 to 3.0 within the range of a density of 0.7 to 1.5 on a characteristic curve and a point gamma of 1.2 to 2.0 within the range of a density of 2.0 to 2.8 on the characteristic curve when the photographic combination is exposed to X-ray and subjected to processing (A), wherein the processing (A) is conducted using a roller transport type automatic processor and the following developer solution (D) and fixed solution (F) at a developing temperature of 35° C for a developing time of 12 to 15 sec. and at a fixing temperature of 33° C for a fixing time of 7 to 13 sec.:Developer solution D Water 800 ml Potassium hydroxide 17.1 g Potassium sulfite 65.7 g Potassium metabisulfite 6.7 g Hydroquinone 27.0 g Potassium carbonate 9.0 g Trisodium ethylenediaminetetraacetate (35% aqueous solution) 8.0 g Triethylene glycol 11.8 g 5-nitroindazole 0.03 g Acetic acid (80% aqueous solution) 16.0 g 1-Phenyl-3-pyrazolidone 1.2 g 1-Phenyl-5-mercaptotetrazole 0.015 g 5-Methylbenzotriazole 0.024 g Glutar aldehyde (50% aqueous solution) 8.6 g Potassium bromide 2.6 g Water to make 1 lit. in which the pH is adjusted to 10.33;and Fixer solution F Water 130 ml Ammonium thiosulfate (75% weight/volume) 245.5 g Sodium sulfite 11.7 g Sodium hydroxide 6.56 g Sodium gluconate 2.02 g Citric acid monohydrate 2.40 g Acetic acid (80% aqueous solution) 22.5 g Aluminum sulfate 9.8 g 75% Sulfuric acid 5.73 g Water to make 1 lit. in which the pH is adjusted to 4.18.
  2. 7
    The photographic material of any one of preceding claims, wherein the support is a transparent support and layer arrangements on opposite sides of the support being identical with each other.
  3. 8
    An radiographic imaging system for making a radiograph by a radiography apparatus using a photographic combination of a silver halide photographic light sensitive material in combination with at least an intensifying screen, the photographic material comprising a support having a light sensitive silver halide emulsion layer on each of both sides of the support, wherein the photographic material exhibits a cross-over of not more than 15%, a point gamma of 1.8 to 3.0 within the range of a density of 0.7 to 1.5 on a characteristic curve and a point gamma of 1.2 to 2.0 within the range of a density of 2.0 to 2.8 on the characteristic curve when the photographic combination is exposed to X-ray, and wherein the radiography apparatus conducts making a radiograph under the condition that a distance between a focal point of an X-ray tube and the photographic combination is 1.0 to 3.0 m and a distance between an object and the photographic combination is 0.2 to 1.5 m.
  4. 12
    The system of any one of claims 8 to 11, wherein the intensifying screen exhibits a CTF value of not less than 0.79 at a spatial frequency of 1 line/mm and a CTF value of not less than 0.36 at a spatial frequency of 3 lines/mm.
  5. 13
    The system of any one of claims 8 to 12, wherein in the photographic combination, the photographic material is combined with two intensifying screens so as to give a density of 1.0 when the photographic combination is exposed to 0.5 to 1.5 mR of X-ray produced by a three phase X-ray source operated at 80 kVp and subjected to processing (A), and wherein the processing (A) is conducted using a roller transport type automatic processor and the following developer solution (D) and fixed solution (F) at a developing temperature of 35° C for a developing time of 12to 15 sec. and at a fixing temperature of 33° C for a fixing time of 7 to 13 sec.:Developer solution D Water 800 ml Potassium hydroxide 17.1 g Potassium sulfite 65.7 g Potassium metabisulfite 6.7 g Hydroquinone 27.0 g Potassium carbonate 9.0 g Trisodium ethylenediaminetetraacetate (35% aqueous solution) 8.0 g Triethylene glycol 11.8 g 5-nitroindazole 0.03 g Acetic acid (80% aqueous solution) 16.0 g 1-Phenyl-3-pyrazolidone 1.2 g 1-Phenyl-5-mercaptotetrazole 0.015 g 5-Methylbenzotriazole 0.024 g Glutar aldehyde (50% aqueous solution) 8.6 g Potassium bromide 2.6 g Water to make 1 lit. in which the pH is adjusted to 10.33;and Fixer solution F Water 130 ml Ammonium thiosulfate (75% weight/volume) 245.5 g Sodium sulfite 11.7 g Sodium hydroxide 6.56 g Sodium gluconate 2.02 g Citric acid monohydrate 2.40 g Acetic acid (80% aqueous solution) 22.5 g Aluminum sulfate 9.8 g 75% Sulfuric acid 5.73 g Water to make 1 lit. in which the pH is adjusted to 4.18.
  6. 14
    The system of any one of claims 8 to 13, wherein the photographic material is one as claimed in any one of claims 1 to 7.
Independent claims6