EP1091361B1 - Filtre et dispositif d'examen par rayons-x - Google Patents

Filtre et dispositif d'examen par rayons-x Download PDF

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Publication number
EP1091361B1
EP1091361B1 EP20000203400 EP00203400A EP1091361B1 EP 1091361 B1 EP1091361 B1 EP 1091361B1 EP 20000203400 EP20000203400 EP 20000203400 EP 00203400 A EP00203400 A EP 00203400A EP 1091361 B1 EP1091361 B1 EP 1091361B1
Authority
EP
European Patent Office
Prior art keywords
foils
filter
another
ducts
stack
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 - Lifetime
Application number
EP20000203400
Other languages
German (de)
English (en)
Other versions
EP1091361A1 (fr
Inventor
Johannus Wilhelmus Int.Octrooibureau BV Weekamp
Adrianus Cornelius Int.Octrooibur.BV Van Kasteren
Jacobus Bernardus Int.Octrooibur.BV Giesbers
Bartholomeus P.H. Int.Octrooibur.BV Van Nunen
Menno Willem Jose Int.Octrooibur.BV Prins
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.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
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Publication date
Application filed by Koninklijke Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Priority to EP20000203400 priority Critical patent/EP1091361B1/fr
Publication of EP1091361A1 publication Critical patent/EP1091361A1/fr
Application granted granted Critical
Publication of EP1091361B1 publication Critical patent/EP1091361B1/fr
Anticipated expiration legal-status Critical
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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
    • G21K1/00—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
    • G21K1/10—Scattering devices; Absorbing devices; Ionising radiation filters

Definitions

  • the invention relates to filter which includes a stack of foils which are locally attached to one another, and also includes comparatively rigid members which are situated to both sides of the stack of foils, and at least one of which is attached to an outer surface of the stack of foils by way of a buffer member, the rigid member enabling the foils to be moved away from one another in a main direction which extends transversely of the surface, ducts being formed between the foils.
  • the invention also relates to an X-ray examination apparatus provided with such a filter.
  • a filter is to be understood to mean any system of ducts comprising a number of ducts.
  • the interconnected foils are deformable and are moved apart in a main direction which extends transversely of the surfaces of the foils in the stack, notably of the outer surfaces.
  • the distance between the outer surfaces of the stack of foils then increases; the dimension of the foils in a duct direction which extends parallel to the ducts to be formed remains the same whereas the foils assume undulating patterns in a transverse direction which extends transversely of the duct direction and the main direction and parallel to the surface, the dimension of the stack of foils in said transverse direction being reduced due to said undulating patterns.
  • the rigid members are only moved away from one another and are not subject to deformation.
  • the buffer member serves to create a smooth transition between the rigid members and the outer surfaces of changing dimensions, so that the foils situated near the outer surfaces of the stack of foils can assume the same undulating pattern as the foils situated near the centre of the stack. As a result, all ducts situated between the foils will have the same shape.
  • the buffer member is made of a rubber, a viscoelastic material or an elastic material.
  • Materials of this kind have the drawback that a tensile force applied thereto in the main direction and a desired shrinkage in the transverse direction are accompanied by shrinkage in the duct direction.
  • Such a deformation in the duct direction is undesirable, because the foil connected to the buffer member will then also be subject to such a deformation, so that the ducts situated opposite the foil will have a shape other than that of the other ducts of the filter.
  • the buffer member includes elements that are moveable towards another mainly in a direction extending parallel to the surface of the foils and transversely of the ducts.
  • the buffer member according to the invention incurs no or only negligibly small deformation in the duct direction and is deformed only in the transverse direction.
  • the elements of the buffer member may comprise laminations, turns of a spring, etc.
  • WO-93/01048 discloses a method and apparatus for manufacturing honeycomb structures from thermoplastic materials utilising weld bonds. This document is not related to a filter or a X-ray apparatus. Also no buffer member is being used.
  • the buffer member in an embodiment of the filter according to the invention includes a number of laminations, each of which is rigidly connected, near a first edge, to a plate which constitutes the rigid member, each lamination being connected to one of the outer surfaces of the stack of foils by way of a second edge which is remote from the first edge, the second edges extending parallel to the ducts and being movable towards one another while the foils move away from one another in the main direction.
  • the second edges of the laminations can simply move relative to one another in the transverse direction, without the laminations being subject to deformation in the duct direction.
  • the buffer member in a further embodiment of the filter according to the invention is provided with a spring comprising turns, the rigid member extending through the turns and the turns being connected to one of the outer surfaces of the stack at a side which is remote from the rigid member.
  • the turns of the springs can be moved towards and away from one another in the transverse direction.
  • the dimension of the turns does not change, or only hardly so, in the duct direction.
  • the filter according to the invention is suitable for use in an X-ray examination apparatus which includes an X-ray source and an X-ray detector, the filter being situated between the X-ray source and the X-ray detector.
  • An X-ray absorbing liquid is introduced into the ducts of the filter, the X-ray absorptivity of each duct being adjustable by adjustment of the amount of X-ray absorbing liquid in the individual ducts.
  • Fig. 1 shows a filter 1 as disclosed in the not previously published European patent application 98201706.3.
  • the filter 1 includes a number of synthetic foils 2, four of which are shown in Fig. 1.
  • the synthetic foils 2 are locally attached to one another along seams 3.
  • the outer foils 2 of the stack of foils are attached to buffer members 5 by means of an adhesive layer 4.
  • the buffer members are connected to rigid metal plates 6 at a side which is remote from the foils. The plates 6 can be moved away from one another in a main direction H which is denoted by arrows P1, P2.
  • the buffer members 5 In order to ensure that the foils which are connected to the buffer members 5 assume an undulating pattern similar to that of the foils situated near the center, the buffer members 5 should also undergo such a change in the transverse direction D at a side facing the foils. At a side which is remote from the foils 2, however, the buffer member 5 is connected to the rigid plate 6 which is not subject to a change of dimensions.
  • the buffer member 5 in the filter 1 in conformity with the cited European patent application comprises a rubber, a viscoelastic material or an elastomer material.
  • this material will also be subject to a deformation in the duct direction K; as has already been stated, the latter deformation is undesirable.
  • Figs. 2A and 2B show a filter 10 according to the invention with foils 2 which are arranged against one another and foils 2 which have been moved away from one another, respectively.
  • the filter 10 includes a number of foils 2 which are attached to one another along seams 3 and a two-side adhesive layer 4 which is connected to the outer surfaces 11 of the stack of foils 12.
  • the filter 10 also includes buffer members 13, each of which includes a comparatively large number of laminations 14.
  • a first edge 15 of each lamination 14 is connected, by way of a two-side adhesive layer 16, to a plate 6 which extends parallel to the foils 2.
  • a second edge 17 which is remote from the first edge 15 of each lamination 14 is connected to a side of the adhesive layer 4 which is remote from the stack of foils 12.
  • the first edge 15 and the second edge 17 extend parallel to a duct direction K.
  • the laminations 14 are situated nearer to one another than near the second edge 17.
  • Such a fan-like arrangement of the laminations 14 can be realized, for example by first connecting the first edges 15 of the laminations 14 to the adhesive layer 16. Subsequently, the adhesive layer 16 is bent around a tube so that the laminations 14 extend radially from the tube, after which the adhesive layer 4 is applied to the free second edges 17. After the adhesive layers 4 and 16 have thus been provided on the buffer member 13, the adhesive layers 4 and 16 are connected to the stack of foils 12 and to the plate 6, respectively.
  • the plates 6 are moved away from one another in directions which are denoted by arrows P1, P2 and extend parallel to the main direction H.
  • the foils 2 then assume the undulating patterns which are also assumed by the adhesive layers 4.
  • the adhesive layers 4 are then deformed in the transverse direction D, so that the second edges 17, attached to the adhesive layers 4, are moved towards one another.
  • the laminations 14 are not subject to deformation in the duct direction K during such a displacement of the second edges 17 of the laminations 14.
  • the adhesive layer 4 in the filter shown in the Figs. 2A and 2B has a comparatively large thickness and serves as a transitional zone between the foils 2 and the buffer member 13. Because of the elastic and deformable adhesive layer 4, the outer foils will always assume the same undulating pattern as the foils situated near the center.
  • the adhesive layer 4 it is alternatively possible to make the adhesive layer 4 comparatively thin; the outer foils then follow substantially the same contour as the second edges 17 of the laminations 14 and all foils assume a similar undulating pattern as from a small distance from the edges 17 only.
  • the laminations 14 extend parallel to one another, so that all forces exerted on the foils are directed in the main direction H.
  • Figs. 3A-3D show a second embodiment of a filter 20 according to the invention, the assembly of the filter 20 being shown in steps from Fig. 3A to Fig. 3D.
  • Fig. 3A shows two coiled springs 21, each of which comprises a number of adjacent, substantially rectangular turns 22.
  • Two-side adhesive layers 23 are provided on facing outer sides of the springs 21 (see Fig. 3B).
  • two parallel extending metal rods 24 are inserted through the turns 22 of each spring 21 (see Fig. 3C).
  • an outer surface 11 of a stack of foils 12 is connected to each two-side adhesive layer 23.
  • the metal rods 24 of the individual springs 21 are moved away from one another in a direction parallel to the main direction, the foils are pulled apart and the ducts 7 are formed therebetween (see Fig. 3D).
  • the foils will contract in the transverse direction D; this contraction is also performed, via the adhesive layers 23, by the turns 22 of the springs 21 which move towards one another.
  • Figs. 4A-4C show a third embodiment of a filter 30 according to the invention which is provided with two coiled springs 31, each of which comprises a number of adjacent, substantially rectangular turns 32.
  • the turns 32 of a spring 31 are arranged relative to one another in such a manner that near a lower side they are situated nearer to one another in comparison with the upper side (see Fig. 4B).
  • the turns of the oppositely situated springs 31 are situated nearer to one another at the lower side in comparison with the upper side (see Fig. 4C).
  • the filter 30 is also provided with a stack of foils 33 whose seams 3 are situated relative to one another in the same way as the turns 32 of the spring 31.
  • the turns 32 of the springs 31 are attached to the stack of foils 33 in the same way as the stack of foils of the filter 20 shown in Fig. 3D.
  • Rigid members (not shown) are inserted through the turns 32 of the springs 31, after which the rigid members are moved away from one another while tilting the rigid members relative to one another at the same time, with the result that the rigid members are given the same orientation as the turns 32 of the individual springs 31 (see Fig. 4C). Consequently, the ducts formed in the filter 33 extend at different angles relative to one another.
  • the foils are spaced less far apart near the lower side in comparison with the spacing at the upper side. As a result, the contraction occurring in the transverse direction at the lower side will be less than that occurring at the upper side. As a result of the arrangement of the turns 32 as shown in Fig. 4B, the displacement of the turns relative to one another can also be smaller near the lower side than that near the upper side.
  • the two-side adhesive layer may be, for example a VHB two-side adhesive layer manufactured by 3M.
  • the adhesive layer of an elastic material ensures that even the outer foils have the same undulating pattern as the foils 2 situated near the center.
  • a coating of, for example parylene of a thickness of 10 ⁇ m can be deposited in the ducts 7 after the foils 2 have been moved apart. It is also possible to provide a layer of epoxy glue in the ducts 7. Application of such agents reinforces the honeycomb structure formed and also enables the removal of the buffer members and the rigid members.
  • the filters 10 and 20 according to the invention are suitable for use in inter alia X-ray examination apparatus in which a desired quantity of X-ray absorbing liquid is introduced into the ducts 7.
  • the walls of the ducts 7 may be coated with an electrically conductive metal for application of a potential voltage to the walls, thus enabling control of the desired liquid level in each duct 7.
  • the filter may also be used, for example, as a gas filter, a light distributor, etc.
  • the turns of the springs may also have a D-shaped cross-section, their flat side then facing the filter.

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Apparatus For Radiation Diagnosis (AREA)

Claims (9)

  1. Filtre (10; 20; 30) comprenant un empilage de feuilles (2; 12; 33) qui sont fixées localement l'une à l'autre et comprenant également des organes relativement rigides (6; 24) qui se situent des deux côtés de l'empilage de feuilles et dont au moins un est fixé à une surface extérieure (11) de l'empilage de feuilles par le biais d'un organe tampon (13; 21; 31), l'organe rigide permettant que les feuilles soient déplacées l'une s'éloignant de l'autre dans une direction principale (H) qui s'étend transversalement par rapport à la surface, des conduits (7) étant formés entre les feuilles dans lesquels l'organe tampon comprend des éléments (14; 22; 32) qui sont mobiles l'un vers l'autre principalement dans une direction (D) s'étendant en parallèle à la surface des feuilles et transversalement aux conduits.
  2. Filtre selon la revendication 1, caractérisé en ce que l'organe tampon (13) comprend un certain nombre de laminages (14) dont chacun est relié rigidement, près d'un premier bord (15), à une plaque (6) qui constitue l'organe rigide, chaque laminage étant relié à une des surfaces extérieures de l'empilage de feuilles (2) par le biais d'un deuxième bord (17) qui se situe dans un sens s'éloignant du premier bord, les deuxièmes bords s'étendant en parallèle aux conduits (7) et étant mobiles l'un vers l'autre alors que les feuilles s'éloignent l'une de l'autre dans la direction principale.
  3. Filtre selon la revendication 2, caractérisé en ce que les laminages (14) s'étendent en parallèle l'un à l'autre après que les feuilles se sont déplacées dans un sens l'une s'éloignant de l'autre sur une distance donnée.
  4. Filtre selon la revendication 1, caractérisé en ce que l'organe tampon est pourvu d'un ressort (21; 31) qui comprend des spires (21; 32), l'organe rigide (24) s'étendant à travers les spires et les spires étant reliées à une des surfaces extérieures de l'empilage à un côté qui se situe dans un sens s'éloignant de l'organe rigide.
  5. Filtre selon la revendication 4, caractérisé en ce que l'organe rigide comprend deux tiges (24) s'étendant l'une en parallèle à l'autre.
  6. Filtre selon la revendication 5, caractérisé en ce que les tiges (24) sont fabriquées à partir de métal.
  7. Filtre selon l'une quelconque des revendications précédentes 1 à 6, caractérisé en ce que l'organe tampon (13; 21; 31) est relié à une des surfaces extérieures de l'empilage de feuilles par le biais de moyens élastiques (4; 23).
  8. Filtre selon la revendication 7, caractérisé en ce que le matériau élastique est une couche adhésive bilatérale (4; 23).
  9. Appareil d'examen à rayons X qui xomprend un dispositif de commande, une source à rayons X, un détecteur à rayons X, un filtre selon l'une quelconque des revendications précédentes 1 à 8 qui est disposé entre la source à rayons X et le détecteur à rayons X et qui comprend des conduits (7) et un liquide d'absorption de rayons X qui est contenu dans les conduits, la quantité de liquide d'absorption de rayons X dans des conduits individuels et, en conséquence, l'absorptivité de rayons X des conduits étant réglables au moyen du dispositif de commande.
EP20000203400 1999-10-04 2000-10-02 Filtre et dispositif d'examen par rayons-x Expired - Lifetime EP1091361B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20000203400 EP1091361B1 (fr) 1999-10-04 2000-10-02 Filtre et dispositif d'examen par rayons-x

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP99203240 1999-10-04
EP99203240 1999-10-04
EP20000203400 EP1091361B1 (fr) 1999-10-04 2000-10-02 Filtre et dispositif d'examen par rayons-x

Publications (2)

Publication Number Publication Date
EP1091361A1 EP1091361A1 (fr) 2001-04-11
EP1091361B1 true EP1091361B1 (fr) 2005-02-09

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EP20000203400 Expired - Lifetime EP1091361B1 (fr) 1999-10-04 2000-10-02 Filtre et dispositif d'examen par rayons-x

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Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69227591T2 (de) * 1991-07-12 1999-05-06 Hexcel Corp Verfahren und vorrichtung zur herstellung von verschweissten thermoplastischen wabenstrukturen
EP0998746B1 (fr) * 1998-05-22 2003-08-20 Koninklijke Philips Electronics N.V. Appareil de radiographie comportant un filtre de rayons x
DE69919109T2 (de) * 1998-05-22 2005-07-21 Koninklijke Philips Electronics N.V. Honigwabenstruktur und verfahren zur herstellung von honigwabenstrukturen

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