EP1373929A1 - X-ray detector comprising a plurality of cameras sharing a common field of view - Google Patents

X-ray detector comprising a plurality of cameras sharing a common field of view

Info

Publication number
EP1373929A1
EP1373929A1 EP02757740A EP02757740A EP1373929A1 EP 1373929 A1 EP1373929 A1 EP 1373929A1 EP 02757740 A EP02757740 A EP 02757740A EP 02757740 A EP02757740 A EP 02757740A EP 1373929 A1 EP1373929 A1 EP 1373929A1
Authority
EP
European Patent Office
Prior art keywords
ray detector
cameras
plate
characterized
rigid plate
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Withdrawn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
EP02757740A
Other languages
German (de)
French (fr)
Inventor
Regis Guillemaud
Francis Sauvage
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
Original Assignee
Commissariat a lEnergie Atomique et aux Energies Alternatives
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
Priority to FR0104345 priority Critical
Priority to FR0104345A priority patent/FR2822961B1/en
Application filed by Commissariat a lEnergie Atomique et aux Energies Alternatives filed Critical Commissariat a lEnergie Atomique et aux Energies Alternatives
Priority to PCT/FR2002/001067 priority patent/WO2002079804A1/en
Publication of EP1373929A1 publication Critical patent/EP1373929A1/en
Application status is Withdrawn legal-status Critical

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS
    • G01V5/00Prospecting or detecting by the use of nuclear radiation, e.g. of natural or induced radioactivity
    • G01V5/0008Detecting hidden objects, e.g. weapons, explosives
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01TMEASUREMENT OF NUCLEAR OR X-RADIATION
    • G01T1/00Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
    • G01T1/16Measuring radiation intensity
    • G01T1/20Measuring radiation intensity with scintillation detectors

Abstract

The invention concerns an X-ray detector whereof the cameras (10) are all mounted on a common rigid plate (1) by a surface support and a screwing which ensures their optical distance from a scintillator (7) itself mounted on the plate (1) by a casing (6) forming a dark room (8). The common mounting of the main elements of the detector on a single rigid plate substantially reduces image degradation produced by heat-induced or mechanical deformations of the detector.

Description

RAY DETECTOR X HAVING MULTIPLE CAMERAS TO SHARING A

FIELD OF VIEW

This invention relates to an X-ray detector, precisely responsible for collecting an image 5 taken X-ray after converted into lumineu rays.

Such detectors include a scintillator consisting of a membrane intercepting X-rays and containing a material producing photons 0 when it was struck by these rays, and a camera system, comprising a detecting portion preceded by a suitable optical placed behind the scintillator. The camera and the scintillator are attached to a frame which further unit and which includes a casing 5 forming a darkroom between the scintillator and the camera system. In many sensors, the system comprises a plurality of cameras that share the field of view and whose measurements are compiled by an electronic system to 0 to restore greater overall image that might take one camera.

Designers must face the problem of maintaining a constant focal distance between the scintillator and the cameras, or it will produce 5 a blur. Causes of deformation are even more acute with large detectors comprising a plurality of cameras. We must guard against not only the mounting inaccuracies, but also against the original strain mechanical or thermal 0 of the frame, from the weight of the elements and often significant heating they must undergo. In practice, known detectors n.'offrent not sufficient guarantees of reliability. A detector thus comprises a square box-shaped frame containing the darkroom. The scintillator is in the top face of the box, and the cameras are secured to the four lateral faces. This circuit is very sensitive to deformations of the frame.

The invention represents a significant improvement of X-ray detectors in this aspect. It relates to a detector comprising a plurality of cameras sharing a field of vision, comprising an optical preceding a detection portion and a scintillator preceding cameras and a frame including in particular a darkroom enclosure, as the already mentioned; it is original in that the mount comprises a rigid plate breakthrough front of the cameras, the cameras are attached directly to the underside of the rigid plate, and the darkroom enclosure is directly fixed to the upper face of the rigid plate and comprises an upper opening around which is fixed the scintillator. The essential elements of the detector s' and ordered a single structural part of the frame which is little subject to deformation due to its rigidity. If deformations are produced on the plate, they are essentially linear, causing almost no flex, and are less damaging to the quality of the image: it has been found that it was the angular movements of the cameras that were more harmful.

In an advantageous construction, the cameras are attached • on the underside of the rigid plate around respective openings thereof which are pierced in front of the optics. The fixing points are then concentric to the axes of the cameras, thereby increasing the stability thereof. They are as close to the center of the plate and therefore suffer a small part of elongation of consecutive plate overheating.

The rigidity of the plate can be increased by stiffening the structure by a suitable darkroom in the envelope. Other aspects, features and advantages of the invention will now be described by means of Figures 1, 2 and 3 show three different views (side, top and front view), generally in section, of the device. An essential element of the detector plate 1 is a central rigid and to which most other elements are fixed. Is a metal alloy having good mechanical strength and can thus be built in Fortal HR, aluminum alloy having a strength comparable to that of steel, together with a lower weight and a lesser coefficient of expansion. The deformations of thermal or mechanical origin, especially produced by the same weight of the sensor are reduced. Note that the sensor is designed to be placed in directions and in different assemblies without the quality of the image may be disturbed. Mounting fragments of the sensor belonging to a stand, bear the reference 2; the assembly can be insured by screws 3 engaged through holes 4 at the edges of the plate 1.

The plate 1 is provided with a lead coating 5 on its upper side in order to stop radiation X parasite. Stands on its upper face an envelope 6 square section with an upper opening. A scintillator 7 is mounted on this opening having its periphery screwed on the upper edge of the casing 6. The volume enclosed by the casing 6 and covered by the scintillator 7 forms a darkroom 8. The casing 6 is attached to the plate 1 by screws 9 and pins (symbolized by their axis) engaged from below thereof.

The cameras are four in number and each bear the general reference 10. It comprises an optical 11 to the front, then a detection portion 12 for converting a light image into a digital image. A control unit 13 common to all the cameras 10 is disposed at the center and the detector substance; Cable 14 connects to the sensing portions 12, 12. The detecting portions are arranged in opposition by pairs, that is to say they have aligned sighting axis and directed towards each other; Moreover, the pairs of aligned axes are parallel to the longitudinal direction of the plate 1. However, the viewing axes are all parallel and vertical to the output of the cameras 10. This is produced by providing the optic 11 of a mirror bevel gear 15. a central volume under the mirrors 15 include not only the .électronique housing 13, but a cooling assembly 16 essentially comprising a pump 17, a heat exchanger 18 and a fan 19. the cooling cameras 10 can be completed by heat sinks 20 located behind them. All these elements are enveloped by a lower cover 21 without special rigidity and whose edges are screwed to the plate 1. The detection is made possible by providing the plate 1 with openings 22 in front of the respective optical cameras 11, 10. These openings 22 does not necessarily affect the rigidity of the plate 1, but a suitable stiffening structure, such as rib 23 of rectangular section may be disposed through the plate 1 in the darkroom 8 if necessary. The cohesion of the cameras 10 is held by a casing which includes a mounting plate 24, placed in front of the optical assembly 11. The plates 24 are joined to the underside 25 of the plate 1 and joined to it by screws 26 (symbolized by axes thereof), the number of four by camera 10 and which are concentric to the axis of sight of the optical assembly 11. This makes it possible to place the cameras 10 at a predetermined position in the detector : the elements of the optic 11 are in particular at a substantially invariable distance of the scintillator 7. It was further shown antireflective rings 27 mounted in the openings 22 and which comprise an inner thread to absorb radiation coming to touch these rings. The rigidity of the plate 1 reduced deformations despite its fairly large area, and the expansion coefficient reduced its material also makes it insensitive to temperature rise; the position of the cameras is provided and maintained by the specific installation offered by the mounting plates 24 against surface contacts the rigid plate 1; 10 cameras are supported no other place or by the plate 1 or any other element of the frame, so that the most significant deformation that may be exerted on the periphery of the plate 1, in particular following bending or overheating, do not affect the orientation of the camera 10; Finally, the assembly of the casing 6 on the plate 1 is not likely to transmit deformation that would curl the adverse effect of the scintillator 7 and change and its distance to households cameras 10, and all least if the material of the envelope 6 is the same as that of the plate 1 and therefore has the same expansion coefficient.

Claims

1. X-ray detector comprising a plurality of cameras (10) sharing a field of view and comprising an optical system (11) preceding a detecting portion (12), a scintillator (7) before the camera (10) and a mount in particular comprising an envelope (6) darkroom (8), characterized in that the holder comprises a plate (1) Hard breakthrough (22) in front of the cameras (10), the cameras are attached directly to the underside of the rigid plate, and the darkroom enclosure is directly fixed to the upper face of the rigid plate and comprises an upper opening, around which the scintillator is fixed.
2. X-ray detector according to claim 1, characterized in that the cameras (10) are fixed to the underside of the plate (1) rigid around openings (22) respective to the rigid plate before the optical breakthroughs.
3. X-ray detector according to any one of claims 1 or 2, characterized in that it comprises a stiffening structure (23) of the rigid plate in the darkroom enclosure.
4. X-ray detector 'according to any one of claims 1 to 3, characterized in that the optic comprises an angle mirror (15) and camera detecting portions
(12) are directed in converging directions in pairs.
5. X-ray detector according to claim 4, characterized in that it comprises a cooling module (17, 18, 19) below the deflection mirrors.
6. X-ray detector according to any one of claims 1 to 5, characterized in that the rigid plate is made of aluminum alloy.
7. X-ray detector according to any one of claims 1 to 6, characterized in that the rigid plate (1) and the casing (6) are constructed in the same material.
EP02757740A 2001-03-30 2002-03-27 X-ray detector comprising a plurality of cameras sharing a common field of view Withdrawn EP1373929A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
FR0104345 2001-03-30
FR0104345A FR2822961B1 (en) 2001-03-30 2001-03-30 X-ray detector
PCT/FR2002/001067 WO2002079804A1 (en) 2001-03-30 2002-03-27 X-ray detector comprising a plurality of cameras sharing a common field of view

Publications (1)

Publication Number Publication Date
EP1373929A1 true EP1373929A1 (en) 2004-01-02

Family

ID=8861755

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02757740A Withdrawn EP1373929A1 (en) 2001-03-30 2002-03-27 X-ray detector comprising a plurality of cameras sharing a common field of view

Country Status (4)

Country Link
US (1) US6936823B2 (en)
EP (1) EP1373929A1 (en)
FR (1) FR2822961B1 (en)
WO (1) WO2002079804A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7010092B2 (en) * 2003-08-08 2006-03-07 Imaging Dynamics Company Ltd. Dual energy imaging using optically coupled digital radiography system
UA77289C2 (en) * 2004-11-05 2006-11-15 X-radiation receiver
DE102009033304A1 (en) * 2009-07-15 2011-01-27 Siemens Aktiengesellschaft Detector for use in X-ray computed tomography device for generating X-ray radiation on patient during scanning patient for diagnosis purpose, has digital camera arranged in region estimatable by X-ray radiation
CN102508312B (en) * 2011-09-30 2013-08-21 云南电力试验研究院(集团)有限公司 Insulated bandage-type fastening device for X-ray imaging plate for power use

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4076984A (en) * 1976-06-23 1978-02-28 Jury Vasilievich Gromov Introscope
US4297580A (en) * 1977-12-27 1981-10-27 North American Philips Corporation X-ray optical system for article inspection, with components disposed on parallel axes
US5235191A (en) * 1992-03-06 1993-08-10 Miller Robert N Real-time x-ray device
EP1063537A3 (en) * 1995-11-24 2005-09-14 Swissray International Inc. Optical arrangement and method for electronically detecting an x-ray image

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO02079804A1 *

Also Published As

Publication number Publication date
FR2822961A1 (en) 2002-10-04
WO2002079804A1 (en) 2002-10-10
US20030133540A1 (en) 2003-07-17
US6936823B2 (en) 2005-08-30
FR2822961B1 (en) 2003-05-09

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