EP1241685A1 - Schirm zur Umwandlung von Röntgenstrahlen in Lichtphotonen - Google Patents

Schirm zur Umwandlung von Röntgenstrahlen in Lichtphotonen Download PDF

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Publication number
EP1241685A1
EP1241685A1 EP02290601A EP02290601A EP1241685A1 EP 1241685 A1 EP1241685 A1 EP 1241685A1 EP 02290601 A EP02290601 A EP 02290601A EP 02290601 A EP02290601 A EP 02290601A EP 1241685 A1 EP1241685 A1 EP 1241685A1
Authority
EP
European Patent Office
Prior art keywords
screen
panel
rays
conversion
face
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Withdrawn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
EP02290601A
Other languages
English (en)
French (fr)
Inventor
Francis Sauvage
Régis Guillemaud
Michel Antonakios
Gérard Sanchez
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.)
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
Commissariat a lEnergie Atomique CEA
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 Commissariat a lEnergie Atomique CEA filed Critical Commissariat a lEnergie Atomique CEA
Publication of EP1241685A1 publication Critical patent/EP1241685A1/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • 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
    • G21K2004/02—Conversion screens for the conversion of the spatial distribution of X-rays or particle radiation into visible images, e.g. fluoroscopic screens characterised by the external panel structure
    • 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
    • G21K2004/12—Conversion screens for the conversion of the spatial distribution of X-rays or particle radiation into visible images, e.g. fluoroscopic screens with a support

Definitions

  • the invention relates to a screen for converting X-rays in light photons.
  • the invention also relates to a screen panel. for converting X-rays into light photons as well as a radiology device comprising such a conversion screen.
  • the invention applies in the fields which use X-ray conversion to light photons such as, for example, the domain of medical radiology or the control field no destructive of nuclear waste storage packages.
  • a X-ray to photon conversion screen luminous is associated with means of emission of X-ray and acquisition means and image display to realize a device for radiology.
  • a radiology device includes an X-ray generator associated with a tube X-rays, a support (on which a patient is placed or an object) and an x-ray film.
  • a flow of X-rays are emitted from the X-ray tube. This flux of X-ray is attenuated by the patient or the object. The flow residual passed through the patient or the object is measured by the radiographic film. There are then interaction of unattenuated X photons with the film ray.
  • the screens of conversion intended for medical imaging should be precise and as efficient as possible, that is to say that they have to provide the greatest number of photons possible light, for each interacting X photon with the screen.
  • such screens include a rigid panel (metal sheet or glass sheet) covered, on one of its faces, with a layer of scintillator material such as oxysulfide gadolinium or sodium iodide (CsI) which provides conversion of X-rays to visible light.
  • CsI oxysulfide gadolinium or sodium iodide
  • Prison metallic or glass sheet ensures the rigidity of the conversion screen.
  • Such a conversion screen is then placed in the radiology device so that the light from the radiant image X can be emitted to the digital sensor.
  • the optics used require a fixed focal length and a depth of field whose accuracy must reach plus or minus 100 microns at the screen, the less mechanical deformation then causes blurring on the captured image.
  • Screen distortions can be partially corrected by increasing the thickness of the panel but then, the panel absorbs part of the x-rays and the resolution of the image is found strongly degraded.
  • the invention does not have these drawbacks.
  • the invention relates to a screen panel for converting X-rays into light photons.
  • the panel includes a rigid foam plate, a first layer of composite material located on a first side of the rigid foam plate and a second layer of composite material located on a second face of the rigid foam plate parallel to the first side.
  • the whole composed by the first layer of composite material, the rigid foam plate and the second layer of composite material provides solution to the problem of making a screen large dimension.
  • This set makes it possible to make a very rigid panel compared to deformation and little attenuation on X-rays.
  • the foam itself is rigid and does not contribute to the reduction tension or screen plating.
  • the plate foam has a mechanical holding role between the layers of composite material surrounding it so to guarantee very good rigidity of the whole sign.
  • the foam has the advantage of being little attenuating to x-rays and to have a structure homogeneous with respect to X-rays.
  • the invention also relates to a screen conversion of x-rays to light photons comprising a panel and an active layer for converting X-rays into deposited light photons on one side of the panel.
  • the panel is a panel according to the invention.
  • the invention also relates to a device for radiology including a conversion screen X-ray in light photons, characterized in that the conversion screen is a screen according to the invention.
  • the deformations of the screen are advantageously compatible with the precision of depth of field of optical devices used.
  • Figure 1 shows a sectional view of a x-ray conversion screen panel to light photons according to the invention.
  • the conversion screen panel includes a first layer of composite material 1, a plate of rigid foam transparent to X-rays 2 and a second layer of composite material 3.
  • the periphery of the panel is reinforced by a frame 4.
  • the plate rigid foam 2 and layers of composite material 1 and 3 are assembled by gluing.
  • the rigid foam used is a rigid foam with high density, such as, for example, foam polymethacrylic structural sold, for example, under the trade name of Mousse ROHACEL and manufactured by ROHM company.
  • the layers of composite material 1 and 3 are made, for example, by a matrix of fibers glass or carbon taken in resin.
  • the thickness of the foam board can be equal to 7mm and the thickness of the fiber layers of glass or carbon 1 and 3 equal to 0.5mm. More general, the thickness of the foam plate can represent approximately 2% of the length of a screen.
  • the frame 4, preferably made by the same material that layers 1 and 3, is particularly useful for consolidating the structure of large dimensions.
  • the foam plate can be replaced with a honeycomb-based plate of paper or plastic chosen to mitigate weakly X-rays.
  • a honeycomb-based plate of paper or plastic chosen to mitigate weakly X-rays Such a nested plate gives the same characteristics mechanical than a rigid foam sheet.
  • the plate rigid foam will however be preferred because it has weaker and more homogeneous attenuation on the rays X.
  • Figure 2 shows a screen for converting X-ray light photons according to the invention.
  • the screen includes, in addition to the panel shown in Figure 1, a frame 5 deposited on the active face which operates the conversion.
  • Frame 5 is deposited in periphery of the active face.
  • the thickness of the frame 5 is substantially equal to the thickness of the layer active conversion 6.
  • the presence of the frame 5 advantageously allows the direct deposition of the conversion layer on the panel.
  • the conversion layer deposition technique allows also simple manufacturing of high energy screens by inserting a tungsten sheet between the panel and conversion layer.
  • Fasteners (handles, covers from fixing) and electrical contacts (not shown) in the figure) can be inserted in box 5.
  • a conversion screen according to the invention is advantageously rigid, light and usable in position vertical, horizontal or intermediate. Such a screen can advantageously reach large dimensions.
  • a control of the thickness of the layer active 6 is easily achievable when depositing the layer.
  • the addition of intermediate layers between the panel and the active conversion layer is also easily achievable depending on the applications considered.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Measurement Of Radiation (AREA)
  • Apparatus For Radiation Diagnosis (AREA)
  • Laminated Bodies (AREA)
EP02290601A 2001-03-13 2002-03-11 Schirm zur Umwandlung von Röntgenstrahlen in Lichtphotonen Withdrawn EP1241685A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0103390A FR2822294B1 (fr) 2001-03-13 2001-03-13 Ecran de conversion de rayonnement x en photons lumineux
FR0103390 2001-03-13

Publications (1)

Publication Number Publication Date
EP1241685A1 true EP1241685A1 (de) 2002-09-18

Family

ID=8861053

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02290601A Withdrawn EP1241685A1 (de) 2001-03-13 2002-03-11 Schirm zur Umwandlung von Röntgenstrahlen in Lichtphotonen

Country Status (3)

Country Link
US (1) US6737656B2 (de)
EP (1) EP1241685A1 (de)
FR (1) FR2822294B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE502004012256D1 (de) * 2004-05-21 2011-04-14 Agfa Gevaert Healthcare Gmbh Speicherleuchtstoffplatte zur Speicherung von Röntgeninformation
US11974869B2 (en) * 2022-01-25 2024-05-07 Kurt Hainze Portable x-ray cassette positioning system and method

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4710637A (en) * 1986-02-10 1987-12-01 Eastman Kodak Company High efficiency fluorescent screen pair for use in low energy X radiation imaging
US4789785A (en) * 1985-12-11 1988-12-06 Fuji Photo Film Co., Ltd. Radiation image converting material
JPS63313100A (ja) * 1987-06-16 1988-12-21 Kasei Optonix Co Ltd 放射線像変換スクリ−ン
EP0327134A2 (de) * 1988-02-05 1989-08-09 Fuji Photo Film Co., Ltd. Schirm zum Speichern eines Strahlungsbildes
EP0919859A2 (de) * 1997-09-30 1999-06-02 EASTMAN KODAK COMPANY (a New Jersey corporation) Verbesserte radiographische Kassette
US5935475A (en) * 1996-06-06 1999-08-10 The Boeing Company Susceptor integration into reinforced thermoplastic composites
DE19841772A1 (de) * 1998-09-11 2000-03-23 Siemens Ag Eingangsfenster eines Röntgenbildverstärkers und Verfahren zu dessen Herstellung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69322196T2 (de) * 1992-04-21 1999-05-27 Agfa-Gevaert N.V., Mortsel PSL Radiographie-Kassette
US5405107A (en) * 1992-09-10 1995-04-11 Bruno; Joseph W. Radar transmitting structures
US5274864A (en) * 1992-10-08 1994-01-04 Air Methods Knock down litter board
US5751001A (en) * 1996-04-22 1998-05-12 Agfa-Gevaert Cassette for photo-stimulable radiography

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4789785A (en) * 1985-12-11 1988-12-06 Fuji Photo Film Co., Ltd. Radiation image converting material
US4710637A (en) * 1986-02-10 1987-12-01 Eastman Kodak Company High efficiency fluorescent screen pair for use in low energy X radiation imaging
JPS63313100A (ja) * 1987-06-16 1988-12-21 Kasei Optonix Co Ltd 放射線像変換スクリ−ン
EP0327134A2 (de) * 1988-02-05 1989-08-09 Fuji Photo Film Co., Ltd. Schirm zum Speichern eines Strahlungsbildes
US5935475A (en) * 1996-06-06 1999-08-10 The Boeing Company Susceptor integration into reinforced thermoplastic composites
EP0919859A2 (de) * 1997-09-30 1999-06-02 EASTMAN KODAK COMPANY (a New Jersey corporation) Verbesserte radiographische Kassette
DE19841772A1 (de) * 1998-09-11 2000-03-23 Siemens Ag Eingangsfenster eines Röntgenbildverstärkers und Verfahren zu dessen Herstellung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 013, no. 152 (P - 856) 13 April 1989 (1989-04-13) *

Also Published As

Publication number Publication date
FR2822294A1 (fr) 2002-09-20
US6737656B2 (en) 2004-05-18
FR2822294B1 (fr) 2003-10-24
US20020130272A1 (en) 2002-09-19

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