EP0187088A1 - Verfahren zur Herstellung eines Multidetektors mit Ionisationskammern und durch dieses Verfahren erzeugter Multidetektor - Google Patents

Verfahren zur Herstellung eines Multidetektors mit Ionisationskammern und durch dieses Verfahren erzeugter Multidetektor Download PDF

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Publication number
EP0187088A1
EP0187088A1 EP85402457A EP85402457A EP0187088A1 EP 0187088 A1 EP0187088 A1 EP 0187088A1 EP 85402457 A EP85402457 A EP 85402457A EP 85402457 A EP85402457 A EP 85402457A EP 0187088 A1 EP0187088 A1 EP 0187088A1
Authority
EP
European Patent Office
Prior art keywords
resin
base
partitions
multidetector
strips
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.)
Ceased
Application number
EP85402457A
Other languages
English (en)
French (fr)
Inventor
Marco Tirelli
René Lecolant
Raoul Hecquet
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.)
General Electric CGR SA
Original Assignee
General Electric CGR SA
Thomson CGR
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 General Electric CGR SA, Thomson CGR filed Critical General Electric CGR SA
Publication of EP0187088A1 publication Critical patent/EP0187088A1/de
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J47/00—Tubes for determining the presence, intensity, density or energy of radiation or particles
    • H01J47/02—Ionisation chambers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y10T156/1052—Methods of surface bonding and/or assembly therefor with cutting, punching, tearing or severing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y10T156/1052—Methods of surface bonding and/or assembly therefor with cutting, punching, tearing or severing
    • Y10T156/1062—Prior to assembly
    • Y10T156/1064—Partial cutting [e.g., grooving or incising]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y10T156/1052—Methods of surface bonding and/or assembly therefor with cutting, punching, tearing or severing
    • Y10T156/1082—Partial cutting bonded sandwich [e.g., grooving or incising]

Definitions

  • the invention relates to a method of manufacturing a multidetector. It also relates to the multidetector obtained by this process.
  • the muttidetectors concerned are essentially multidetectors with ionization chambers. They are of the type used in X-ray CT scanners.
  • a multidetector with ionization chambers comprises a plurality of chambers, adjacent to each other, and separated from each other by metallized partitions forming an electrode: alternatively anode or cathode. All these chambers are filled with an ionizable gas (Xenon for example).
  • Xenon ionizable gas
  • One of the most important factors of the intensity of the ionization current is the width of a chamber: the distance which separates the two electrodes, or partitions, from this chamber.
  • ionization chambers of equal width should be produced.
  • ceramic supports are used in which grooves adjacent to each other are produced by sawing.
  • the partitions are then slipped one by one into these grooves to determine the chambers.
  • This method comprises an inconvenience: to slide partitions - electrodes in the grooves it is necessary that the grooves are sufficiently surdimens ata i with respect to thicknesses of the partition walls. This necessary oversizing is annoying for the precision of the installation of the partitions.
  • each segment of the support is itself composed of four elongated elements, joined to each other. Before these four elements are joined, their des is covered with a layer of silver lacquer which serves as a conductive electrode and which acts as a guard ring. The machining of the grooves is undertaken on a segment only after the four elements which constitute it have been joined by gluing. It is necessary to note that the delicate grooving operation must be undertaken then as many times as there are multidetectors to build.
  • the object of the present invention is to remedy the drawbacks mentioned by eliminating the grooving operation for the manufacture of multidetectors.
  • the installation of the electrode partitions in the invention is carried out all at once, by means of a specialized tool which maintains all the electrodes at the same time.
  • the bases of the partitions bristle one side of this tool. These bases are then immersed, all at the same time, in a bath of resin hardenable by polymerization. As soon as the resin has hardened, the tool is removed: the partitions are held relative to each other. The accuracy of the gap between adjacent partitions is then determined by the structure of the tool used. In this solution the tool is reusable and therefore there is no need to start the delicate grooving operation again. An operation of the same order of precision is undertaken once and for all, it is that which is used to manufacture the tool.
  • the invention also relates to a multidetector with ionization chambers provided with metallized partitions, characterized in that it comprises at least one resin base to which the partitions are welded with resin.
  • Figure 1 shows a block 1 of epoxy resin free of air bubbles because based on polymerized resin under pressure.
  • the quality of the resin is chosen with a damping coefficient favorable to microphony.
  • the block 1 is large enough so that a base 2 of width e, of thickness b and the length L can be cut there.
  • the thickness of the block 1 will also be h. Pruning can be done preferably by milling. This way of doing things, which results in not subjecting the base 2 to any mechanical stress, is conducive to obtaining bases of all the desired shapes.
  • the base 2 will have the shape of a portion of crown centered on a center 3.
  • the opening angle 4 of the portion of crown is approximately 41 ° 40.
  • the length L is approximately 1 meter
  • the thickness is 5 to 10 mm
  • the width is 50 mm.
  • a point source of X-rays at the location of the center 3. This source radiates a fan-shaped beam with an angular opening substantially equal to the angle 4.
  • the source and the multi-detector are provided to be installed on a third generation CT scanner: a rotary CT scanner.
  • Figures 2 to 4 show a preferred embodiment of the guard rings.
  • Figure 2a is a section along a radial plane 5 of the base 2 shown in perspective in Figure 2b.
  • This FIG. 2a shows the base 2 provided at its base with a layer 6 representing a frame to reinforce the mechanical solidity of this base.
  • this frame 6 comprises two sheets 7 and 8 of epoxy resin enclosing a honeycomb structure 9.
  • This honeycomb structure is seen in section. It can also be made of epoxy resin.
  • the honeycomb structure is oriented perpendicular to the sheets 7 and 8, it perfectly supports the expansion constraints imposed by the base 12. It supports them all the better since the structure 9 is also made of resin.
  • the frame 6 can be eliminated by choosing for example for block 1 a resin loaded with glass fibers.
  • three longitudinal grooves numbered 10 to 12 are produced. For example, they are spaced from each other by approximately 16 mm and their depth is approximately 1 mm. The tolerance for making these grooves is not very demanding.
  • the grooves 10 to 12 can be used to set up guard rings.
  • the positioning of these rings is shown in Figures 3.
  • Figure 3b shows a guard ring 13 in the form of a curved chute conforming to the general shape of the detector. The depth of these chutes, in one example, is 8 mm.
  • Figure 3a shows a section along a plane 5 of the base 2 once the guard rings numbered 13 to 16 have been placed there.
  • These guard rings are separated from each other by insulating strips numbered 17 to 19 made of epoxy resin.
  • the strips 17 to 19 have a thickness slightly less than the width of the grooves 10 to 12. They are easily engaged therein.
  • the heads of these troughs rise above the upper edges of the strips of resin placed on edge in the grooves.
  • this difference in height is worth about 1 mm, its justification will be studied later.
  • the troughs are made of hardened copper (for example 0.3 mm thick), which gives them a certain useful rigidity during their installation.
  • pegs such as 20 regularly spaced throughout the trough.
  • the manufacturing tolerance of the trunking is of the same order as that which presides over the production of the grooves 10 to 12. In any case, it allows the trunking to be produced by pressing copper sheets.
  • 5 shows in a plane such that 5 a partition 22 approached above the base 2.
  • the partitions 22 are provided with bases or legs such as 23 to 26. These legs are located on two opposite edges of the partitions. Only the legs 23 and 24, located on the same edge are approached from the base 2. These legs are provided at mid-height with holes such as 27.
  • the electrode 22 shown is an electrode of a given polarity: for example an anode.
  • the two electrodes adjacent to this electrode and which form with it two adjacent ionization chambers are of reverse polarity: for example cathodes. They are not shown, but one is in a deeper plane and the other is in a plane closer to the observer of the figure. They also have two legs. These are provided to engage respectively in the troughs 13 and 15. As all the electrodes are put in place at the same time, it is completely advantageous to pour resin not yet polymerized at the same time in all the troughs.
  • the legs of the cathode bases also have holes such as 27.
  • the justification for these holes is to set up a system of communicating vases above the resin layer during polymerization. In this way we avoid the rise of resin by capillary action along the partitions.
  • This polymerization resin fills the chutes as indicated again by streaks in FIG. 5. It is flush again at the level marked 21 mentioned previously. It is important that this level 21 is lower than the top of the troughs forming guard rings.
  • the leakage currents which propagate in the resin are essentially surface currents. It is therefore important not to put resins in contact with partition-anodes with resins in contact with partition-cathodes. This is the reason why, in a preferred manner in the invention, the guard rings have the form of chutes whose heads emerge above the level 21.
  • FIG. 6 also represents a high-voltage supply device for the troughs forming guard rings.
  • a generator 29 supplies the chutes 13 to 16 and 30 to 33 at voltages close to the bias, anode or cathode voltage, to which each of the partitions 22 is subjected by its connection 60.
  • the tabs 23 to 26 of the partition 22 immerse in the resin contained in the chutes respectively 16, 14, 33 and 31. All these chutes are maintained at the same potential; they are all connected to a single terminal of the generator 29. It is the same for the chutes 15, 13, 32 and 30 which are connected together to another terminal of the generator 29 since the resin which they contain maintains partitions of polarity opposite to that of partition 22.
  • the tops of the troughs were located below the base of the legs of the partitions so that they could slide in the grooves. That is to say that these peaks were below level 21 until which the resin is spread so that it grips the partitions.
  • the operations consisting in setting up the chutes, in coating them with resin, then in welding there with resin the bases of the electrodes succeed because the chutes are maintained in a base which accepts the same dilation as 'them: that is to say the resin base of the invention.
  • the chutes in themselves do not cause differential stress. They are fine and moreover are fixed by pins to the base which drives them in its own deformations.
  • Figure 7 recalls the device which leads to the manufacturing process according to the invention.
  • This device is a multidetector comprising partitions such as 22 joined and held together by two bases respectively 2 and 28 made essentially of epoxy resin. There are also, at the lower right part, peaks such as 34 of spouts which emerge from the resin.
  • FIG. 8 represents an example of a tool used for holding the partitions before their bases are immersed in the resin to be polymerized contained in the troughs.
  • FIG. 9 shows, in section in a radial direction such as 35, that the tool comprises two jaws 36 and 37 which enclose the partitions. It is noted that the bases of the partitions are protruding beyond the plane of the tool. Both jaws are movable and can be moved towards one another by any means, for example by screwing the two threaded butterflies 38 and 39 about bolt 40 and 4 1 which are used to assemble the two jaws. The two bolts are parallel to each other. They impose a collinear displacement of the two mac h ories. This movement is recalled in FIG. 8 by the arrows 42 and 43.
  • FIG. 8 represents a tool used for producing a curved multidetector.
  • the angle at the center 44 of this multidetector in an example is 41 ° 40.
  • the tool can be perfectly adapted to the realization of a multidetector which would be straight.
  • each jaw 36 and 37 is provided with notches 45 and 4 respectively 6. When an action tends to bring the two closer together jaws, the edges, respectively 51 and 52 of each partition, are pressed against the bottoms of the notches.

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  • Measurement Of Radiation (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
EP85402457A 1984-12-14 1985-12-10 Verfahren zur Herstellung eines Multidetektors mit Ionisationskammern und durch dieses Verfahren erzeugter Multidetektor Ceased EP0187088A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8419188A FR2574989B1 (fr) 1984-12-14 1984-12-14 Procede de fabrication d'un multidetecteur a chambres d'ionisation et multidetecteur obtenu par ce procede
FR8419188 1984-12-14

Publications (1)

Publication Number Publication Date
EP0187088A1 true EP0187088A1 (de) 1986-07-09

Family

ID=9310621

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85402457A Ceased EP0187088A1 (de) 1984-12-14 1985-12-10 Verfahren zur Herstellung eines Multidetektors mit Ionisationskammern und durch dieses Verfahren erzeugter Multidetektor

Country Status (3)

Country Link
US (1) US4715917A (de)
EP (1) EP0187088A1 (de)
FR (1) FR2574989B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1367603A2 (de) * 2002-05-31 2003-12-03 General Electric Company Röntgenstrahlungskollimator und Herstellungsverfahren
CN104414676A (zh) * 2013-09-09 2015-03-18 西门子公司 X射线探测器和方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5061216A (en) * 1990-04-16 1991-10-29 The United States Of America As Represented By The United States Department Of Energy Ionization chamber dosimeter
US5416376A (en) * 1992-10-29 1995-05-16 The Regents Of The University Of California Aerogel-supported filament
US5306370A (en) * 1992-11-02 1994-04-26 Xerox Corporation Method of reducing chipping and contamination of reservoirs and channels in thermal ink printheads during dicing by vacuum impregnation with protective filler material

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4283817A (en) * 1978-12-20 1981-08-18 General Electric Company Method for bonding electrode plates in a multicell x-ray detector
EP0046125A2 (de) * 1978-10-13 1982-02-17 COMMISSARIAT A L'ENERGIE ATOMIQUE Etablissement de Caractère Scientifique Technique et Industriel Strahlungsdetektor
DE3248184A1 (de) * 1982-11-02 1984-05-03 Yokogawa Hokushin Electric Corp., Musashino, Tokio/Tokyo Roengtenstrahlungsdetektor und verfahren zu seiner herstellung

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5842941B2 (ja) * 1979-10-08 1983-09-22 株式会社 日立メディコ 電離箱型ｘ線検出器
JPS57161677A (en) * 1981-03-31 1982-10-05 Toshiba Corp Radiation detector
FR2505492B1 (de) * 1981-05-06 1985-11-08 Commissariat Energie Atomique
JPS5958379A (ja) * 1982-09-28 1984-04-04 Shimadzu Corp 放射線検出器の製作方法
JPH103378A (ja) * 1996-06-14 1998-01-06 Matsushita Electric Ind Co Ltd 演算装置および演算方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0046125A2 (de) * 1978-10-13 1982-02-17 COMMISSARIAT A L'ENERGIE ATOMIQUE Etablissement de Caractère Scientifique Technique et Industriel Strahlungsdetektor
US4283817A (en) * 1978-12-20 1981-08-18 General Electric Company Method for bonding electrode plates in a multicell x-ray detector
DE3248184A1 (de) * 1982-11-02 1984-05-03 Yokogawa Hokushin Electric Corp., Musashino, Tokio/Tokyo Roengtenstrahlungsdetektor und verfahren zu seiner herstellung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENTS ABSTRACTS OF JAPAN, vol. 8, no. 163 (P-290) [1600], 27 juillet 1984, page 15 P 290; & JP - A - 59 58 379 (SHIMAZU SEISAKUSHO K.K.) 04.04.1984 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1367603A2 (de) * 2002-05-31 2003-12-03 General Electric Company Röntgenstrahlungskollimator und Herstellungsverfahren
EP1367603A3 (de) * 2002-05-31 2008-12-10 General Electric Company Röntgenstrahlungskollimator und Herstellungsverfahren
CN104414676A (zh) * 2013-09-09 2015-03-18 西门子公司 X射线探测器和方法
CN104414676B (zh) * 2013-09-09 2018-09-21 西门子公司 X射线探测器和方法

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Publication number Publication date
US4715917A (en) 1987-12-29
FR2574989B1 (fr) 1987-01-09
FR2574989A1 (fr) 1986-06-20

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