WO1992013492A1 - Capteur de radiations ionisantes utilisable dans un systeme d'imagerie radiographique - Google Patents
Capteur de radiations ionisantes utilisable dans un systeme d'imagerie radiographique Download PDFInfo
- Publication number
- WO1992013492A1 WO1992013492A1 PCT/FR1992/000118 FR9200118W WO9213492A1 WO 1992013492 A1 WO1992013492 A1 WO 1992013492A1 FR 9200118 W FR9200118 W FR 9200118W WO 9213492 A1 WO9213492 A1 WO 9213492A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sensor according
- sensor
- scintillator element
- tubular guides
- rays
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/20—Measuring radiation intensity with scintillation detectors
- G01T1/2006—Measuring radiation intensity with scintillation detectors using a combination of a scintillator and photodetector which measures the means radiation intensity
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T5/00—Recording of movements or tracks of particles; Processing or analysis of such tracks
- G01T5/08—Scintillation chambers
Definitions
- the present invention relates to ionizing radiation sensors, such as X or ⁇ rays, used in industrial or medical radiographic imaging systems.
- a sensor of this kind used for a few years in intraoral dental radiology in a device making it possible to view in real time on a screen the radiographic information supplied and marketed under the name
- Radiovisiography® is described in particular in European Patent No. 0.129.451 and in US Patent No. 4.593.400 in the name of the applicant.
- such a sensor comprises a matrix charge transfer device (CCD) associated with a scintillator element and a filter means for opposing the passage of X-rays not transformed into rays of wavelength visible by the scintillator element .
- CCD matrix charge transfer device
- this filter means is a screen formed by optical fibers lined with particles of metal oxides intended to absorb the energy of X-rays not transformed by the scintillator.
- the sensor of the invention which implements a means ensuring not only a filtering function but also guiding the radiation, this latter function contributing to a large extent, as will be understood on reading the description below, to the formation of large images quality- More precisely, the sensor of the invention is remarkable in that said filter means is formed by the association of a non-optical element constituted by a bundle of tubular guides, wholly or partly metallic, and of the 'scintillator element, the latter being housed in said non-optical element.
- the senor of the invention does not include a fiber optic system, unlike the sensors of the prior art, which in particular makes it possible to reduce the overall dimensions of the device in significant proportions, this having a great interest in certain applications where the useful space for the examination is limited for example, the interior of the oral cavity.
- the radiation guidance function can be considered secondary. It is not produced by a system of optical fibers, as we have just pointed out, nor by the scintillator itself, as for example in EP-A-0.423.030, but by metal tubes.
- FIG. 1 there is shown at 1 the sensor which is formed by a housing 10 liquid and gas tight, which contains a matrix charge transfer device 20 (CCD) coupled to a microelectronics 30 for controlling and amplifying the output signal of the charge transfer device, arranged after the latter, said microelectronics can also be arranged laterally, the above signal being transmitted to a processing and display unit (not shown) by means of a cable 11.
- CCD matrix charge transfer device
- microelectronics 30 for controlling and amplifying the output signal of the charge transfer device, arranged after the latter, said microelectronics can also be arranged laterally, the above signal being transmitted to a processing and display unit (not shown) by means of a cable 11.
- the receiving face of the charge transfer device is protected by a bundle 40 of tubular guides having common walls and in which is housed a scintillator element.
- This scintillator element is formed of a conventional scintillation material 51 charged with particles 52 capable of absorbing the radiation coming from the X-ray source and the secondary or scattered radiation originating from the radiographed object.
- these absorbent particles 52 consist of metal oxides or nitrates whose density of the metal element is greater than 10, for example tungsten oxides, lead oxides, tantalum oxides or barium nitrates .
- tubular guides have the following structural and dimensional characteristics: they are made, in whole or in part, in a metallic material comprising metallic elements of very high density, preferably greater than 10, which can be chosen from the following metals: lead, tungsten, platinum, gold, osmium, irridium, tantalum or in a mixture of these metals.
- Their opening on the other hand is included in a ratio of 2/1 to 5/1 linearly with respect to the elementary points of light of the matrix device with charge transfer.
- the height is approximately 1 mm but may, depending on the applications and depending on the needs for attenuation of energy radiation, be between 0.5 and 4 mm.
- the overall thickness of the sensor is thus between 5 to 6 mm, whereas it was 14 mm with the sensor of the prior art which incorporated a screen of optical fibers having a thickness of about 11 mm.
- the index 100 represents a so-called "primary" ray which has passed through, without being absorbed, the object to be radiographed and which enters the tubular guide in a direction substantially parallel to the vertical axis of the latter.
- This ray 100 penetrates deeply into the scintillation material lining the interior of the guide because, because of its high energy, it will be absorbed statistically only in the deep layers of the scintillation material by emitting light rays 110 and 111.
- a large part of the light rays 110 will contribute, by striking the receiving face of the charge transfer device, to the formation of the image while the rays 111 will be completely absorbed, for some before reaching said face.
- the index 200 a secondary or scattered ray which comes from the radiographed object itself.
- This ray 200 which has a low energy, is statistically stopped in the upper layers of the scintillation material loaded with absorbent particles and only a very small part of the light rays 210 resulting from this absorption can be transferred through the overall thickness of the scintillation material towards the receiving face of the charge transfer device, the other rays (rays 211) not being detected.
- the index 300 shows a primary ray of energy equivalent to that of ray 100 but which penetrates laterally into the tubular guide following an imperfect col ⁇ mation. This ray will thus strike during its path the walls of the guide which are coated, as has been specified above, with a high density metallic material.
- the secondary rays 309 which are generated by this absorption, at the walls of the guide, will be transformed into rays of visible wavelength, some of which (rays 310) will reach the receiving face of the charge transfer device while others (rays 311) will be absorbed within the scintillation material.
- the radius 300 has an incidence making an angle greater than 5 ° relative to the axis of the tubular guides, the latter will be crossed giving a imprecision in the image since several guides may be concerned, the quality of the image being in a way inversely proportional to the number of guides crossed by the same incident ray.
- this set reduces the scattering of parasitic rays which come from the radiographed object itself, that it prevents lateral penetration of the primary rays by forming an obstacle to their propagation and that, in doing so, it limits the diffusion of the secondary rays coming from the contacts of the primary rays with said obstacle.
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- High Energy & Nuclear Physics (AREA)
- Molecular Biology (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Measurement Of Radiation (AREA)
- Apparatus For Radiation Diagnosis (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP92506011A JPH05508224A (ja) | 1991-02-11 | 1992-02-11 | ラジオグラフィー画像処理システムにおいて使用が可能なイオン化放射線センサー |
US07/941,082 US5382798A (en) | 1991-02-11 | 1992-02-11 | Ionizing radiation sensor used in a system of radiographic imaging |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR91/01971 | 1991-02-11 | ||
FR9101971A FR2672691A1 (fr) | 1991-02-11 | 1991-02-11 | Capteur de radiations ionisantes utilisable dans un systeme d'imagerie radiographique. |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1992013492A1 true WO1992013492A1 (fr) | 1992-08-20 |
Family
ID=9409879
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR1992/000118 WO1992013492A1 (fr) | 1991-02-11 | 1992-02-11 | Capteur de radiations ionisantes utilisable dans un systeme d'imagerie radiographique |
Country Status (6)
Country | Link |
---|---|
US (1) | US5382798A (fr) |
EP (1) | EP0525169A1 (fr) |
JP (1) | JPH05508224A (fr) |
CA (1) | CA2080367A1 (fr) |
FR (1) | FR2672691A1 (fr) |
WO (1) | WO1992013492A1 (fr) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0585172A1 (fr) * | 1992-08-26 | 1994-03-02 | Catalin Stoichita | Procédé d'acquisition d'images par rayons X et agencement pour la mise en oeuvre de ce procédé |
EP0606732A1 (fr) * | 1992-12-17 | 1994-07-20 | Nanoptics Incorporated | Système d'imagerie radiographique en temps réel avec haute efficacité et haute résolution |
US6369391B1 (en) | 1999-05-02 | 2002-04-09 | Elgems Ltd. | Light output optimization |
US10690785B2 (en) | 2018-02-14 | 2020-06-23 | General Electric Company | Systems and methods for nuclear medicine imaging using sodium based crystals |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6031892A (en) * | 1989-12-05 | 2000-02-29 | University Of Massachusetts Medical Center | System for quantitative radiographic imaging |
US5864146A (en) * | 1996-11-13 | 1999-01-26 | University Of Massachusetts Medical Center | System for quantitative radiographic imaging |
US5956382A (en) * | 1997-09-25 | 1999-09-21 | Eliezer Wiener-Avnear, Doing Business As Laser Electro Optic Application Technology Comp. | X-ray imaging array detector and laser micro-milling method for fabricating array |
US6252231B1 (en) * | 1999-01-25 | 2001-06-26 | Analogic Corporation | X-ray absorbing, light reflective medium for x-ray detector array |
FR2797760B1 (fr) * | 1999-08-30 | 2002-03-29 | Trophy Radiologie | Procede pour obtenir une image radiographique d'une dent et de son environnement, et dispositifs permettant de mettre en oeuvre ce procede |
US6384400B1 (en) * | 1999-11-29 | 2002-05-07 | General Electric Company | High resolution and high luminance scintillator and radiation imager employing the same |
WO2005093458A1 (fr) * | 2004-03-19 | 2005-10-06 | Triumf, Operating As A Joint Venture By The Governors Of The University Of Alberta, The University Of British Columbia, ... | Detecteur ionique de positions tridimensionnelles de reseaux unidimensionnels |
US20080019476A1 (en) * | 2006-07-24 | 2008-01-24 | Armen Mirzayan, Dds, Inc. | Apparatus and Method for Producing Medical X-ray Images |
US8430563B2 (en) * | 2009-12-22 | 2013-04-30 | Real Time Imaging Technologies, Llc | Dental fluoroscopic imaging system |
US9194963B2 (en) * | 2012-03-09 | 2015-11-24 | Electronics And Telecommunications Research Institute | Scintillating module, positron emission tomography, ion beam profiler, ion beam filter, and ion beam generating device using scintillating module |
WO2016115117A1 (fr) | 2015-01-12 | 2016-07-21 | Real Time Imaging Technologies, Llc | Système d'imagerie radiographique à faible dose |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2578737A2 (fr) * | 1983-06-16 | 1986-09-19 | Mouyen Francis | Capteur intra-buccal pour un appareil permettant d'obtenir une image radiologique dentaire |
DE3920447A1 (de) * | 1989-06-22 | 1991-01-24 | Schott Glaswerke | Szintillationselement fuer einen faseroptischen detektor |
EP0423030A1 (fr) * | 1989-10-12 | 1991-04-17 | Commissariat A L'energie Atomique | Ecran radioluminescent à facteur de qualité et à résolution spatiale améliorés pour l'imagerie en photons X ou gamma |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3032657A (en) * | 1959-06-16 | 1962-05-01 | Nat Radiac Inc | Composite scintillation crystal |
US3507734A (en) * | 1965-02-26 | 1970-04-21 | Isomet Corp | Process of making an imaging scintillation chamber |
GB2034148B (en) * | 1978-08-30 | 1983-06-15 | Gen Electric | Multi element high resolution scintillator structure |
US4560877A (en) * | 1982-12-29 | 1985-12-24 | General Electric Company | Solid state detector module |
FR2547495B1 (fr) * | 1983-06-16 | 1986-10-24 | Mouyen Francis | Appareil permettant d'obtenir une image radiologique dentaire |
JPS61110079A (ja) * | 1984-11-02 | 1986-05-28 | Toshiba Corp | 放射線検出器 |
GB2167279A (en) * | 1984-11-15 | 1986-05-21 | Ian Redmayne | Radiation imaging |
US5220170A (en) * | 1985-12-11 | 1993-06-15 | General Imaging Corporation | X-ray imaging system and solid state detector therefor |
US5015861A (en) * | 1989-07-20 | 1991-05-14 | Regents Of The University Of California | Lead carbonate scintillator materials |
US5057692A (en) * | 1990-06-29 | 1991-10-15 | General Electric Company | High speed, radiation tolerant, CT scintillator system employing garnet structure scintillators |
-
1991
- 1991-02-11 FR FR9101971A patent/FR2672691A1/fr not_active Withdrawn
-
1992
- 1992-02-11 US US07/941,082 patent/US5382798A/en not_active Expired - Lifetime
- 1992-02-11 JP JP92506011A patent/JPH05508224A/ja active Pending
- 1992-02-11 WO PCT/FR1992/000118 patent/WO1992013492A1/fr not_active Application Discontinuation
- 1992-02-11 CA CA002080367A patent/CA2080367A1/fr not_active Abandoned
- 1992-02-11 EP EP92906550A patent/EP0525169A1/fr not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2578737A2 (fr) * | 1983-06-16 | 1986-09-19 | Mouyen Francis | Capteur intra-buccal pour un appareil permettant d'obtenir une image radiologique dentaire |
DE3920447A1 (de) * | 1989-06-22 | 1991-01-24 | Schott Glaswerke | Szintillationselement fuer einen faseroptischen detektor |
EP0423030A1 (fr) * | 1989-10-12 | 1991-04-17 | Commissariat A L'energie Atomique | Ecran radioluminescent à facteur de qualité et à résolution spatiale améliorés pour l'imagerie en photons X ou gamma |
Non-Patent Citations (1)
Title |
---|
Nuclear Instruments and Methods in Physics Research, vol. A257, no. 3, 1 juillet 1987, (Amsterdam, NL), P. SONDEREGGER: "Fibre calorimeters: dense, fast, radiation resistant", pages 523-527, voir page 524, ligne 17 - page 525, ligne 32; figure 1 * |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0585172A1 (fr) * | 1992-08-26 | 1994-03-02 | Catalin Stoichita | Procédé d'acquisition d'images par rayons X et agencement pour la mise en oeuvre de ce procédé |
FR2698184A1 (fr) * | 1992-08-26 | 1994-05-20 | Stoichita Catalin | Procédé et dispositif capteur d'images par rayons X utilisant la post-luminiscence d'un scintillateur. |
US5398275A (en) * | 1992-08-26 | 1995-03-14 | Catalin; Stoichita | Method and apparatus for acquiring images by X-rays |
EP0606732A1 (fr) * | 1992-12-17 | 1994-07-20 | Nanoptics Incorporated | Système d'imagerie radiographique en temps réel avec haute efficacité et haute résolution |
US6369391B1 (en) | 1999-05-02 | 2002-04-09 | Elgems Ltd. | Light output optimization |
US10690785B2 (en) | 2018-02-14 | 2020-06-23 | General Electric Company | Systems and methods for nuclear medicine imaging using sodium based crystals |
Also Published As
Publication number | Publication date |
---|---|
FR2672691A1 (fr) | 1992-08-14 |
JPH05508224A (ja) | 1993-11-18 |
EP0525169A1 (fr) | 1993-02-03 |
US5382798A (en) | 1995-01-17 |
CA2080367A1 (fr) | 1992-08-12 |
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