EP0603043A1 - Strahlungsbündel-Kollimatorvorrichtung - Google Patents

Strahlungsbündel-Kollimatorvorrichtung Download PDF

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Publication number
EP0603043A1
EP0603043A1 EP93402997A EP93402997A EP0603043A1 EP 0603043 A1 EP0603043 A1 EP 0603043A1 EP 93402997 A EP93402997 A EP 93402997A EP 93402997 A EP93402997 A EP 93402997A EP 0603043 A1 EP0603043 A1 EP 0603043A1
Authority
EP
European Patent Office
Prior art keywords
wires
radiation
collimator
rank
tangent
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.)
Granted
Application number
EP93402997A
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English (en)
French (fr)
Other versions
EP0603043B1 (de
Inventor
Menhard Kocsis
Bela Farago
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.)
INSTITUT MAX VON LAUE - PAUL LANGEVIN
Original Assignee
INSTITUT MAX VON LAUE - PAUL LANGEVIN
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 INSTITUT MAX VON LAUE - PAUL LANGEVIN filed Critical INSTITUT MAX VON LAUE - PAUL LANGEVIN
Publication of EP0603043A1 publication Critical patent/EP0603043A1/de
Application granted granted Critical
Publication of EP0603043B1 publication Critical patent/EP0603043B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • G21K1/00—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
    • G21K1/02—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators
    • G21K1/025—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators using multiple collimators, e.g. Bucky screens; other devices for eliminating undesired or dispersed radiation

Definitions

  • the present invention relates to a device for collimating beams of radiation.
  • FIG. 1 An example of such a collimator is schematically represented in FIG. 1.
  • It comprises a plurality of thin parallel strips 2 which are capable of absorbing the incident radiation 4 which it is desired to collimate or which are covered with a material capable of absorbing this radiation.
  • the ratio Do / Lo of the distance between the lamellae 2 to the length Lo of these lamellae is equal to the tangent of half of the maximum divergence 2 ⁇ desired for the radiation beam 6 leaving the collimator.
  • a Soller's collimator has drawbacks.
  • the object of the present invention is to remedy the above drawbacks.
  • the device for collimating beams of radiation which is the subject of the present invention is characterized in that it comprises a plurality of parallel layers of wires which are made or covered with a material capable of absorbing the radiation.
  • the wires used are round.
  • each thread of rank n is tangent to the plane which passes between the thread of rank n-1 of this ply and the thread of rank 1 of adjacent sheet and which is tangent to this row 1 thread and to this row n-1 thread.
  • said material is capable of absorbing neutrons, the device being thus capable of collimating neutron beams.
  • absorbent material cadmium or gadolinium but boron is preferably used.
  • the radiation dose due to the absorption of neutrons is reduced by a factor of 10 compared to an absorbent consisting of cadmium or gadolinium.
  • FIG 2 there is shown schematically, in section, a collimation device according to the invention, for collimating an incident radiation beam 4 and obtaining, at the output of this collimation device, a collimated beam 6 , the maximum divergence of this outgoing beam 6 being equal to 2 ⁇ .
  • the collimation device, or collimator, shown in FIG. 2 comprises a plurality of parallel plies 8 of wires 10 which are made or covered with a material capable of absorbing the radiation.
  • the plies 8 are equidistant from each other and, in each ply 8, the wires 10 are round wires, parallel to each other and the wires of the same rank, that is ie with the same serial number, in the layers, are in planes P parallel to each other and perpendicular to the planes of the layers 8.
  • the wires 10 are stretched individually between two parallel plates 12 which are made rigidly secured to one another, for example by means of spacers 14 (placed outside the bundle to be collimated 4).
  • boron wires are preferably used which can be stretched between the plates 12.
  • tungsten wires coated with boron can be used.
  • wires made or covered with a material capable of absorbing these X-rays preferably tungsten wires.
  • Figure 4 schematically illustrates how to place the wires relative to each other in a collimator according to the invention in order to use a minimum number of wires.
  • the collimator shown schematically and partially, in section, in Figure 4 comprises a plurality of parallel plies of round wires, such as adjacent plies A and B.
  • the position of the third wire A3 of the ply A and the position of the third wire B3 of the ply B are then determined as indicated below.
  • the wire A3 is tangent to the plane B1 A2 which passes between the wires B1 and A2 and which is tangent to these wires B1 and A2.
  • the wire B3 is tangent to the plane A1 B2 which passes between the wires A1 and B2 and which is tangent to these wires A1 and B2.
  • the position of the wires A4 and B4 is then determined as follows.
  • the wire A4 is tangent to the plane B1 A3 which passes between the wires B1 and A3 and which is tangent to these wires B1 and A3.
  • the wire B4 is tangent to the plane A1 B3 which passes between the wires A1 and B3 and which is tangent to these wires A1 and B3.
  • the collimator of FIG. 4 is thus constructed step by step.
  • this collimator is completed with the wires of rank n, such as the wires An and Bn, making it possible to obtain the maximum divergence angle 2 ⁇ initially fixed.
  • the present invention greatly reduces and, in some preferred embodiments, completely eliminates the total reflection of the radiation.
  • the wires are less sensitive than these slats to thermal variations and to degradation by radiation.

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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)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Radiation-Therapy Devices (AREA)
EP93402997A 1992-12-14 1993-12-13 Strahlungsbündel-Kollimatorvorrichtung Expired - Lifetime EP0603043B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9215028 1992-12-14
FR9215028A FR2699319B1 (fr) 1992-12-14 1992-12-14 Dispositif de collimation de faisceaux d'un rayonnement.

Publications (2)

Publication Number Publication Date
EP0603043A1 true EP0603043A1 (de) 1994-06-22
EP0603043B1 EP0603043B1 (de) 1998-05-06

Family

ID=9436555

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93402997A Expired - Lifetime EP0603043B1 (de) 1992-12-14 1993-12-13 Strahlungsbündel-Kollimatorvorrichtung

Country Status (4)

Country Link
US (1) US5468970A (de)
EP (1) EP0603043B1 (de)
DE (1) DE69318381T2 (de)
FR (1) FR2699319B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999031674A1 (de) * 1997-12-17 1999-06-24 Siemens Aktiengesellschaft Streustrahlenraster
EP0999555A1 (de) * 1998-11-02 2000-05-10 Rigaku Corporation Sollerschlitz und Verfahren zu dessen Herstellung
CN109671513A (zh) * 2018-12-27 2019-04-23 中国原子能科学研究院 发散角连续可调的中子准直器结构及其标定方法

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998035358A1 (en) * 1997-02-06 1998-08-13 The University Of Miami Iso-energetic intensity modulator for therapeutic electron beams, electron beam wedge and flattening filters
DE50015405D1 (de) 1999-11-30 2008-11-27 Philips Intellectual Property Gitter zur Absorption von Röntgenstrahlen
US20040095626A1 (en) * 2002-09-30 2004-05-20 Duke University Reference structures and reference structure enhanced tomography
DE10354811B4 (de) * 2003-11-21 2012-09-27 Siemens Ag Streustrahlenraster, insbesondere für medizinische Röngteneinrichtungen, sowie Verfahren zu seiner Herstellung
US7359488B1 (en) * 2004-05-25 2008-04-15 Michel Sayag Technique for digitally removing x-ray scatter in a radiograph
CN102324259A (zh) * 2011-07-18 2012-01-18 中国原子能科学研究院 中子准直器及中子散射谱仪
US10004136B2 (en) * 2015-02-02 2018-06-19 Michael McCrea Satellite-based ballistic missile defense system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2547981A1 (de) * 1975-10-27 1977-04-28 Heribert Dipl Phys Dr Rer Luig Nuklearmedizinisches diagnosegeraet zum ermitteln des verteilungsmusters eines radioaktiven strahlers
USH897H (en) * 1989-09-12 1991-03-05 The United States Of America As Represented By The United States Department Of Energy Boron-copper neutron absorbing material and method of preparation

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4754147A (en) * 1986-04-11 1988-06-28 Michigan State University Variable radiation collimator

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2547981A1 (de) * 1975-10-27 1977-04-28 Heribert Dipl Phys Dr Rer Luig Nuklearmedizinisches diagnosegeraet zum ermitteln des verteilungsmusters eines radioaktiven strahlers
USH897H (en) * 1989-09-12 1991-03-05 The United States Of America As Represented By The United States Department Of Energy Boron-copper neutron absorbing material and method of preparation

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
BRADT ET AL.: "The modulation collimator in X-ray astronomy", SPACE SCIENCE REVIEWS, no. 8, 1968, DORDRECHT-HOLLAND, pages 471 - 506 *
CLARKE ET AL.: "Wire-wound multi-aperture collimator", PHYSICS IN MEDECINE AND BIOLOGY, vol. 24, no. 2, 1979, LONDON GB, pages 438 - 439 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999031674A1 (de) * 1997-12-17 1999-06-24 Siemens Aktiengesellschaft Streustrahlenraster
US6327341B1 (en) 1997-12-17 2001-12-04 Siemens Aktiengesellschaft Scattered-ray grid
EP0999555A1 (de) * 1998-11-02 2000-05-10 Rigaku Corporation Sollerschlitz und Verfahren zu dessen Herstellung
CN109671513A (zh) * 2018-12-27 2019-04-23 中国原子能科学研究院 发散角连续可调的中子准直器结构及其标定方法
CN109671513B (zh) * 2018-12-27 2020-06-23 中国原子能科学研究院 发散角连续可调的中子准直器结构及其标定方法

Also Published As

Publication number Publication date
FR2699319A1 (fr) 1994-06-17
US5468970A (en) 1995-11-21
DE69318381D1 (de) 1998-06-10
FR2699319B1 (fr) 1995-03-10
EP0603043B1 (de) 1998-05-06
DE69318381T2 (de) 1998-11-19

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