EP0158862B1 - Schirm zum Speichern eines Strahlungsbildes - Google Patents

Schirm zum Speichern eines Strahlungsbildes Download PDF

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Publication number
EP0158862B1
EP0158862B1 EP19850103401 EP85103401A EP0158862B1 EP 0158862 B1 EP0158862 B1 EP 0158862B1 EP 19850103401 EP19850103401 EP 19850103401 EP 85103401 A EP85103401 A EP 85103401A EP 0158862 B1 EP0158862 B1 EP 0158862B1
Authority
EP
European Patent Office
Prior art keywords
radiation image
image storage
phosphor
adhesive layer
storage panel
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.)
Expired
Application number
EP19850103401
Other languages
English (en)
French (fr)
Other versions
EP0158862A1 (de
Inventor
Akira C/O Fuji Photo Film Co. Ltd. Kitada
Kikuo C/O Fuji Photo Film Co. Ltd. Yamazaki
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.)
Fujifilm Holdings Corp
Original Assignee
Fuji Photo Film Co Ltd
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 Fuji Photo Film Co Ltd filed Critical Fuji Photo Film Co Ltd
Publication of EP0158862A1 publication Critical patent/EP0158862A1/de
Application granted granted Critical
Publication of EP0158862B1 publication Critical patent/EP0158862B1/de
Expired legal-status Critical Current

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    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
    • G21K4/00—Conversion screens for the conversion of the spatial distribution of X-rays or particle radiation into visible images, e.g. fluoroscopic screens

Definitions

  • This invention relates to a radiation image storage panel employed in a radiation image recording and reproducing method utilizing a stimulable phosphor, and more particularly, to a radiation image storage panel comprising a support, a phosphor layer which comprises a stimulable phosphor, an adhesive layer and a protective film, superposed in this order.
  • a radiography utilizing a combination of a radiographic film having an emulsion layer containing a photosensitive silver salt material and a radiographic intensifying screen.
  • a radiation image recording and reproducing method utilizing a stimulable phosphor as described, for instance, in U.S. Patent No. 4,239,968, has been recently paid much attention.
  • a radiation image storage panel comprising a stimulable phosphor (i.e., stimulable phosphor sheet)
  • the method involves steps of causing the stimulable phosphor of the panel to absorb radiation energy having passed through an object or having radiated from an object; sequentially exciting the stimulable phosphor with an electromagnetic wave such as visible light or infrared rays (hereinafter referred to as «stimulating rays») to release the radiation energy stored in the phosphor as light emission (stimulated emission); photoelectrically detecting the emitted light to obtain electric signals; and reproducing the radiation image of the object as a visible image from the electric signals.
  • an electromagnetic wave such as visible light or infrared rays
  • the radiation image recording and reproducing method a radiation image is obtainable with a sufficient amount of information by applying a radiation to the object at considerably smaller dose, as compared with the conventional radiography. Accordingly, the radiation image recording and reproducing method is of great value especially when the method is used for medical diagnosis.
  • the radiation image storage panel employed in the radiation image recording and reproducing method has a basic structure comprising a support and a phosphor layer provided on one surface of the support. Further, a transparent film is generally provided on the free surface (surface not facing the support) of the phosphor layer to keep the phosphor layer from chemical deterioration or physical shock.
  • the transparent protectivefilm is generally formed on the phosphor layer by combining a thin film which is beforehand prepared, with the phosphor layer through an adhesive agent.
  • the phosphor layer comprises a binder and stimulable phosphor particles dispersed therein.
  • the stimulable phosphor emits light (gives stimulated emission) when excited with stimulating rays after having been exposed to a radiation such as X-rays. Accordingly, the radiation having passed through an object or having radiated from an object is absorbed by the phosphor layer of the radiation image storage panel in proportion to the applied radiation dose, and a radiation image of the object is produced in the panel in the form of a radiation energy-stored image.
  • the radiation energy-stored image can be released as stimulated emission (light emission) by sequentially irradiating (scanning) the panel with stimulating rays. The stimulated emission is then photoelectrically detected to obtain electric signals, so as to reproduce a visible image from the electric signals.
  • the above-described radiation image recording and reproducing method is very useful for obtaining a radiation image as a visible image as described hereinbefore, and it is desired for the radiation image storage panel employed in the method to provide an image of high quality (high sharpness, low graininess, etc.), as well as a radiographic intensifying screen employed in the conventional radiography.
  • the sharpness of the image in the radiation image recording and reproducing method generally depends not on the spread of the light emitted by the stimulable phosphor within the radiation image storage panel, but on the spread of stimulating rays therewithin.
  • the radiation image stored and recorded on the panel is sequentially detected, that is, the light emitted by the panel upon excitation with the stimulating rays for a certain period of time is detected as an output from the area of the panel to be excited for said period.
  • the stimulating rays are spread through scattering or the like within the panel, an area wider than said area of the panel is excited therewith and the light emitted by the wider area thereof is detected as the output from said area.
  • a radiation image storage panel colored with such colorant is disclosed, for instance, in Japanese Patent Provisional Publication No. 57(1982)-96300 (corresponding to U.S. Patent Application No. 326,642), and as an example of such panel, the publication describes a radiation image storage panel comprising a support, a phosphor layer and a protective film, at least one of which is colored.
  • a radiation image storage panel employed in the radiation image recording and reproducing method is desirable to have a higher sensitivity and to provide an image more improved in the quality, especially for applying the method to medical diagnosis, from the viewpoint of decreasing the exposure dose for a human body and obtaining much more information. Accordingly, a further improvement in the sensitivity of the panel and the quality of the image provided thereby is desired.
  • a radiation image storage panel comprising a support, a phosphor layer which comprises a binder and a stimulable phosphor dispersed therein, an adhesive layer and a protective film, superposed in this order, characterized in that said adhesive layer is colored with a colorant capable of absorbing a portion of stimulating rays for the stimulable phosphor.
  • the improvement of sharpness of the image is achieved by coloring and adhesive layer provided between the phosphor layer and the protective film.
  • the present invention also provides a radiation image storage panel more improved in the sharpness of the image than the known panel in the comparison at the same sensitivity level.
  • a radiation image storage panel generally has a protective film and the formation thereof is usually carried out by combining a previously prepared thin film with a phosphor layer using an adhesive agent.
  • an adhesive layer of a small thickness (several wm - several tens 1 1m) with a colorant capable of selectively absorbing stimulating rays for the stimulable phosphor so as to effectively absorb the stimulating rays which have spread within the protective film.
  • the phosphor layer of the radiation image storage panel according to the present invention can be made thinner than that of the conventional panel when both having the same sensitivity, whereby the sharpness of the image provided by the panel of the invention can be further enhanced in the comparison at the same sensitivity level.
  • This can be said that the sensitivity of the panel can be further enhanced at the same sharpness level basis.
  • the radiation image storage panel of the present invention having the above-described advantages can be prepared, for instance, in the following manner.
  • the support material employed in the present invention can be selected from those employed in the conventional radiographic intensifying screens or those employed in the known radiation image storage panels.
  • the support material include plastic films such as films of cellulose acetate, polyester, polyethylene terephthalate, polyamide, polyimide, triacetate and polycarbonate; metal sheets such as aluminum foil ad aluminum alloy foil; ordinary papers; baryta paper; resin-coated papers; pigment papers containing titanium dioxide or the like; and papers sized with polyvinyl alcohol or the like.
  • aplastic film is preferably employed as the support material of the invention.
  • the plastic film may contain a light-absorbing material such as carbon black, or may contain a light-reflecting material such as titanium dioxide.
  • the former is appropriate for preparing a high-sharpness type radiation image storage panel, while the latter is appropriate for preparing a high-sentitivity type radiation image storage panel.
  • one or more additional layers are occasionally provided between the support and the phosphor layer, so as to enhance the adhesion between the support and the phosphor layer, or to improve the sensitivity of the panel or the quality of an image (sharpness and graininess) provided thereby.
  • a subbing layer may be provided by coating a polymer material such as gelatin over the surface of the support on the phosphor layer side.
  • a light-reflecting layer or a light-absorbing layer may be provided by forming a polymer material layer containing a light-reflecting material such as titanium dioxide or a light-absorbing material such as carbon black.
  • one or more of these additional layers may be provided on the support.
  • the phosphor layer-side surface of the support (or the surface of a subbing layer, light-reflecting layer, or light-absorbing layer in the case that such layers are provided on the phosphor layer) may be provided with protruded and depressed portions for enhancement of the sharpness or radiographic image.
  • the phosphor layer basically comprises a binder and stimulable phosphor particles dispersed therein.
  • the stimulable phosphor gives stimulated emission when excited with stimulating rays after exposure to a radiation. From the viewpoint of practical use, the stimulable phosphor is desired to give stimulated emission in the wavelength region of 300 - 500 nm when excited with stimulating rays in the wavelength region of 400 - 900 nm.
  • Examples of the stimulable phosphor employable in the radiation image storage panel of the present invention include:
  • the divalent europium activated alkaline earth metal fluorohalide phosphor and rare earth element activated rare earth oxyhalide phosphor are particularly preferred, because these show stimulated emission of high luminance.
  • the above-described stimulable phosphors are given by no means to restrict the stimulable phosphor employable in the present invention. Any other phosphors can be also employed, provided that the phosphor gives stimulated emission when excited with stimulating rays after exposure to a radiation.
  • binderto be contained in the phosphor layer examples include: natural polymers such as proteins (e.g. gelatin), polysaccharides (e.g. dextran) and gum arabic; and synthetic polymers such as polyvinyl butyral, polyvinyl acetate, nitrocellulose, ethylcellulose, vinylidene chloride-vinyl chloride copolymer, polyalkyl (meth)acrylate, vinyl chloride-vinyl acetate copolymer, polyurethane, cellulose acetate butyrate, polyvinyl alcohol, and linear polyester.
  • natural polymers such as proteins (e.g. gelatin), polysaccharides (e.g. dextran) and gum arabic
  • synthetic polymers such as polyvinyl butyral, polyvinyl acetate, nitrocellulose, ethylcellulose, vinylidene chloride-vinyl chloride copolymer, polyalkyl (meth)acrylate, vinyl chloride-vinyl acetate cop
  • nitrocellulose linear polyester, polyalkyl (meth)acrylate, a mixture of nitrocellulose and linear polyester, and a mixture of nitrocellulose and polyalkyl (meth)acrylate.
  • binders may be crosslinked with a crosslinking agent.
  • the phosphor layer can be formed on the support, for instance, by the following procedure.
  • stimulable phosphor particles and a binder are added to an appropriate solvent, and then they are mixed to prepare a coating dispersion comprising the phosphor particles homogeneously dispersed in the binder solution.
  • Examples of the solvent employable in the preparation of the coating dispersion include lower alcohols such as methanol, ethanol, n-propanol and n-butanol; chlorinated hydrocarbons such as methylene chloride and ethylene chloride; ketones such as acetone, methyl ethyl ketone and methyl isobutyl ketone; esters of lower alcohols with lower aliphatic acids such as methyl acetate, ethylacetate and butyl acetate; ethers such as dioxane, ethylene glycol monoethylether and ethylene glycol monoethyl ether; and mixtures of the above-mentioned compounds.
  • lower alcohols such as methanol, ethanol, n-propanol and n-butanol
  • chlorinated hydrocarbons such as methylene chloride and ethylene chloride
  • ketones such as acetone, methyl ethyl ketone and methyl isobutyl ket
  • a protective film is formed through a colored adhesive layer, which is a characteristic requisite of the present invention.
  • Examples of adhesive agents employable for the preparation of the adhesive layer in the invention include a polyacrylic resin, a polyester resin a polyurethane resin, a polyvinyl acetate resin and ethylene-vinyl acetate copolymers.
  • the adhesive agent employable in the invention is by no means restricted to the above-listed resins, and for instance, other known resins which are conventionally used as an adhesive agent can be employed.
  • Examples of the colorant employable in the invention also include the colorants described in the aforementioned U.S. Patent Application No. 326,642, that is: organic metal complex salt colorants having Color Index
  • the ratio between the resin and the colorant in the coating dispersion is within the range of from 10 : 1 to 10 6 : 1 (resin : colorant, by weight) in the case of a dye colorant.
  • the retio therebetween is within the range of from 1 : 10 to 10 1 : 1, (resin : colorant, by weight) in the case of a pigment colorant.
  • a colored phosphor layer was formed on the support in the same manner as described in Example 1 except that a dye colorant (copper phthalocyanine) was added to the coating dispersion for a phosphor layer in the amount of 0.1% (by solid content) of the binder.
  • a dye colorant copper phthalocyanine
  • the amount of the dye colorant employed for coloring the phosphor layer was varied within the range of 0.1 - 1.0% (by solid content) of the binder, to prepare a variety of radiation image storage panels consisting of a support, a colored phosphor layer, an adhesive layer and a transparent protective film, in which the phosphor layer were colored in the different degrees (Panels B).
  • the radiation image storage panel of the present invention (Panel a) is remarkably improved in the sharpness of the image as compared with the conventional radiation image storage panel (Panel b).
  • Example 1 The procedure of Example 1 was repeated except that the phosphor layer was formed in the thickness of 150 ⁇ m, to prepare a radiation image storage panel consisting of a support, a phosphor layer, a colored adhesive layer and a transparent protective film.
  • the amount of the dye colorant employed for coloring an adhesive layer was varied within the range of 0.1 -1.0% (by solid content) of the adhesive agent, to prepare a variety of radiation image storage panels consisting of a support, a phosphor layer, a colored adhesive layer and a transparent protective film, in which the adhesive layers were colored in different degrees (Panels C).

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Conversion Of X-Rays Into Visible Images (AREA)

Claims (7)

1. Schirm zum Speichern eines Strahlungsbildes mit einem Träger, einer Phosphorschicht, die ein Bindemittel und einen darin dispergierten, anregbaren Phosphor aufweist, einer Klebemittelschicht und einer Schutzschicht, die in dieser Reihenfolge übereinander angeordnet sind, dadurch gekennzeichnet, dass die Klebemittelschicht mit einem Farbstoff gefärbt ist, der einen Teil der Anregungsstrahlen für den anregbaren Phosphor absorbieren kann.
2. Schirm zum Speichern eines Strahlungsbildes nach Anspruch 1, bei dem die Klebemittelschicht mit einem solchen Farbstoff gefärbt ist, dass dessen mittleres Reflexionsvermögen in dem Wellenlängenbereich der Anregungstrahlen für den anregbaren Phosphor geringer als dessen mittleres Reflexionsvermögen in dem Wellenlängenbereich des Lichtes ist, welches von dem anregbaren Phosphor bei dessen Anregung ausgesendet wird.
3. Schirm zum Speichern eines Strahlungsbildes nach Anspruch 2, bei dem das mittlere Reflexionsvermögen der gefärbten Klebemittelschicht im Wellenlängenbereich der Anregungsstrahlen für den anregbaren Phosphor nicht grösser als 95% des mittleren Reflexionsvermögens einer Klebemittelschicht in dem Wellenlängenbereich der Anregungsstrahlen ist, die der Klebemittelschicht mit der Ausnahme äquivalent ist, dass sie nicht mit dem Farbstoff gefärbt ist.
4. Schirm zum Speichern eines Strahlungsbildes nach Anspruch 2, bei dem das mittlere Reflexionsvermögen der gefärbten Klebemittelschicht in dem Wellenlängenbereich des bei Anregung von dem anregbaren Phosphor ausgesandten Lichtes nicht kleiner als 20% des mittleren Reflexionsvermögens einer Klebemittelschicht in dem Wellenlängenbereich des ausgesandten Lichtes ist, die mit der Klebemitteischicht mit der Ausnahme äquivalent ist, dass sie nicht mit dem Farbstoff gefärbt ist.
5. Schirm zum Speichern eines Strahlungsbildes nach einem der Ansprüche 1 bis 4, bei dem der anregbare Phosphor ein Phosphor ist, der bei Anregung mit Anregungsstrahlen in dem Wellenlängenbereich von 400 bis 900 nm eine angeregte Emission in dem Wellenlängenbereich von 300 bis 500 nm aufweisen kann.
6. Schirm zum Speichern eines Strahlungsbildes nach Anspruch 5, bei dem der anregbare Phosphor ein mit zweiwertigem Europium aktivierter Erdalkalifluorhalogenid-Phosphor ist.
7. Schirm zum Speichern eines Strahlungsbildes nach Anspruch 5, bei dem der anregbare Phosphor ein mit einem Seltene Erdenelement aktivierter Seltene Erdenoxyhalogenid-Phosphor ist.
EP19850103401 1984-03-23 1985-03-22 Schirm zum Speichern eines Strahlungsbildes Expired EP0158862B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP55906/84 1984-03-23
JP5590684A JPS60200200A (ja) 1984-03-23 1984-03-23 放射線像変換パネル

Publications (2)

Publication Number Publication Date
EP0158862A1 EP0158862A1 (de) 1985-10-23
EP0158862B1 true EP0158862B1 (de) 1987-10-28

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EP19850103401 Expired EP0158862B1 (de) 1984-03-23 1985-03-22 Schirm zum Speichern eines Strahlungsbildes

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EP (1) EP0158862B1 (de)
JP (1) JPS60200200A (de)
DE (1) DE3560852D1 (de)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0230324B1 (de) * 1986-01-24 1992-11-19 Kasei Optonix, Ltd. Gradientfolie zur Umwandlung eines Strahlungsbildes
EP0522609B1 (de) * 1991-07-12 1995-09-06 Agfa-Gevaert N.V. Lumineszenter Artikel verwendet in der Radiographie
JPH0680875U (ja) * 1993-04-19 1994-11-15 広和株式会社 可搬式粘性流体供給ポンプ
JP3480516B2 (ja) * 1993-09-20 2003-12-22 富士写真フイルム株式会社 放射線画像変換パネルおよび放射線画像読取方法
JP3537345B2 (ja) * 1998-03-13 2004-06-14 富士写真フイルム株式会社 輝尽性蛍光体シート及び放射線像記録再生方法
US6707057B2 (en) 2000-03-23 2004-03-16 Agfa-Gevaert Storage phosphor screen with thick outermost layer and a method for using the same
US6652994B2 (en) * 2000-10-20 2003-11-25 Konica Corporation Radiation image conversion panel
JP2002277590A (ja) * 2001-03-16 2002-09-25 Konica Corp 放射線像変換パネルおよびその製造方法
JP2002357699A (ja) * 2001-05-31 2002-12-13 Konica Corp 放射線画像変換パネル
CN108780671B (zh) 2015-12-14 2022-06-07 锐珂牙科技术顶阔有限公司 辐射感测热塑性复合面板
WO2017105537A1 (en) * 2015-12-14 2017-06-22 Carestream Health, Inc. Radiation sensing thermoplastic composite panels
JP2019508707A (ja) * 2015-12-14 2019-03-28 ケアストリーム・デンタル・テクノロジー・トプコ・リミテッド 放射線感受性熱可塑性複合パネル

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2513258C3 (de) * 1975-03-26 1978-06-29 Agfa-Gevaert Ag, 5090 Leverkusen Haftschicht für Röntgen-Fluoreszenzverstärkerfolien auf Polyäthylenterephthalatschichtträgern

Also Published As

Publication number Publication date
JPH0452920B2 (de) 1992-08-25
JPS60200200A (ja) 1985-10-09
DE3560852D1 (en) 1987-12-03
EP0158862A1 (de) 1985-10-23

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