EP1859454A2 - Kollimator mit einstellbarer brennweite - Google Patents
Kollimator mit einstellbarer brennweiteInfo
- Publication number
- EP1859454A2 EP1859454A2 EP06723364A EP06723364A EP1859454A2 EP 1859454 A2 EP1859454 A2 EP 1859454A2 EP 06723364 A EP06723364 A EP 06723364A EP 06723364 A EP06723364 A EP 06723364A EP 1859454 A2 EP1859454 A2 EP 1859454A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- collimator
- focal length
- adjustable focal
- cone sliding
- sliding part
- 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
Links
- 230000005855 radiation Effects 0.000 claims description 16
- 238000007689 inspection Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 4
- 238000011156 evaluation Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 abstract description 3
- 238000001228 spectrum Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
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
- G21K1/04—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators using variable diaphragms, shutters, choppers
Definitions
- the present invention relates to a collimator with adjustable focal length, in particular in X-ray inspection systems.
- X-ray inspection methods are used in particular for the detection of critical substances and objects in pieces of baggage or other cargo.
- multistage systems whose first stage is based on the absorption of X-rays.
- a second stage is used, which is selectively fed to objects from the first stage.
- the second stage uses systems whose operating principle is based on diffraction phenomena.
- the diffraction angle in which an incident X-ray beam is deflected, depends on the atomic lattice spacing of the material to be investigated and on the energy and thus the wavelength of the incident radiation.
- the sharply delimited X-ray beam used for the examination the so-called needle beam
- the so-called needle beam has an energy spectrum which is known, for example, from measurements. From the Bragg equation it follows that the incident radiation diffracted at any point at an angle that depends on the energy of the radiation. Radiation with an energy spectrum is therefore diffracted in an angular range, while the diffraction is rotationally symmetrical about the incident needle beam. In an X-ray test, it is desirable to detect only diffracted radiation at a certain angle. This is also achieved through the use of a collimator.
- the passband of the collimator essentially corresponds to the lateral surface of a cone whose tip coincides with the point whose diffraction properties are to be investigated. To examine an area within an object, a plurality of points must be focused.
- a collimator which has a plurality of parallel openings of the same opening angle and with which therefore several points can be focused simultaneously on the axis of rotation.
- the use of a non-segmented detector which is not spatially resolving and therefore provides a common output for all focused points has the disadvantage that the evaluation and the unambiguous assignment of the detected radiation to a diffraction point are difficult.
- a segmented detector which is divided, for example, in separately evaluable circular rings, this disadvantage does not occur, but such a detector is complicated and expensive.
- a collimator according to the invention consists of an outer part, which can simultaneously assume the function of a housing, with a conical inner surface and an inner part with a conical outer surface. These two parts are firmly connected at some distance, leaving a gap between them results. In this gap is at least one movably arranged hollow cone, which is also referred to as a cone sliding part. By moving the movable cone or the movable cones, the focal length of the collimator can be varied.
- the diffraction spectrum detected at a certain angle can be compared with the spectrum of the needle beam. From the Bragg equation, it follows that a diffraction spectrum recorded at a different angle is shifted from the first one. Therefore, the identification is simplified if each measurement is performed at the same opening angle. A constant detection angle of the collimator is achieved in that all conical surfaces have the same opening angle.
- Different detection angles depending on the set focal length can be achieved by different opening angles of the conical surfaces. It is advantageous whenever two adjacent conical surfaces have the same opening angle. Due to this pairwise adaptation, the conical surfaces lie over a large area, which leads to a high radiation absorption of the collimator.
- the adjustment of the focal length is achieved in that the at least one cone sliding part is movable along the axis of rotation.
- the focus of the collimator can be adjusted by a simple translational movement of the cone sliding part in one direction.
- the adjustment of the focal length of the collimator and thus the focused point in the object to be examined is done by the fact that the at least one cone sliding part is moved along the axis of rotation until the desired focal length is reached, wherein using multiple sliding cones this independently can be moved from each other.
- the cone sliding part or the cone sliding parts should always be positioned so that the collimator has only one opening gap. If all the conical surfaces are arranged concentrically around a common axis of rotation and adjacent surfaces each have the same opening angle, the surfaces conform to each other over their entire height. Except in the range of the set gap, the entire collimator appears as a compact unit and allows maximum shielding of the unwanted X-radiation.
- the fact that the individual cone sliding parts can be moved independently, so a single gap can be generated at different positions. This allows as many possible focal lengths. For a number of n cone sliding parts, there are n + 1 possible gaps.
- the collimator can be held in a fixed position and focus by scanning the cone sliding part or the cone sliding parts several points in an object to be examined.
- the travel can be reduced by switching the focal length after the travel of a distance through the collimator, and by moving the collimator along the same path to another examined area.
- the maximum required travel of the collimator according to the invention compared to a non-adjustable collimator can be reduced by a factor that corresponds to the number of adjustable focal lengths, in a collimator with two focal lengths so by half.
- 1a shows a collimator with adjustable focal length with a cone sliding part in an end position
- Figure 1b shows a collimator with adjustable focal length with a cone sliding part in the other end position
- the collimator according to the invention consists essentially of the outer part 1 and the inner part 2. These are arranged concentrically about a rotation axis 4.
- the collimator has a cone sliding part, in FIG. 2 there are two cone sliding parts.
- Such collimators are used in particular in X-ray inspection systems, especially in higher stages of multi-stage testing systems.
- FIG. 1 a there is a cone sliding part 3 in an end position in which it lies against the inner part 2. This results in a passage gap for the radiation between cone sliding part 3 and outer part 1.
- the collimator filters out all radiation that is not diffracted at a point with distance d ⁇ from the collimator at the angle ⁇ .
- the cone sliding part 3 is located on the outer part 1. This results in a passage gap between cone sliding part 3 and inner part 2.
- the opening angle ⁇ of the collimator remains unchanged, but in this position, a point at the distance d 2 is focused by the collimator. It will be readily apparent that by switching the position of the cone sliding part 3, the area focused in moving the collimator is varied. This means that with a fixed area to be examined, the travel of the collimator is reduced. In extreme cases, this saving is half the extent of the area to be examined.
- the collimator again consists of an outer part 1 and an inner part 2, but has two independently movable cone sliding parts 5 and 6.
- the cone sliding part 5 lies on the outer part 1 and conical sliding part 6 on the inner part 2. This results, again under the opening angle ⁇ , to focus on a point at a distance d. 3
- the focal lengths di and d 2 already shown in FIGS. 1a and 1b are obtained.
- the focal length of the collimator according to the invention is adapted by displacing the at least one cone sliding part 3 along the axis of rotation 4 until the desired focal length is reached, wherein when several cone sliding parts 5, 6 are used, they can be moved independently of each other
- the collimator with adjustable focal length according to the invention is part of an X-ray inspection system, which also has an X-ray source, an X-ray detector and an evaluation device for evaluating the detected radiation.
Landscapes
- 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)
- Fuel-Injection Apparatus (AREA)
- Radiation-Therapy Devices (AREA)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005011467A DE102005011467B4 (de) | 2005-03-12 | 2005-03-12 | Kollimator mit einstellbarer Brennweite, hierauf gerichtetes Verfahren sowie Röntgenprüfanlage |
PCT/EP2006/002252 WO2006097254A2 (de) | 2005-03-12 | 2006-03-10 | Kollimator mit einstellbarer brennweite |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1859454A2 true EP1859454A2 (de) | 2007-11-28 |
EP1859454B1 EP1859454B1 (de) | 2009-06-03 |
Family
ID=36914763
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06723364A Active EP1859454B1 (de) | 2005-03-12 | 2006-03-10 | Kollimator mit einstellbarer brennweite |
Country Status (5)
Country | Link |
---|---|
US (1) | US7436934B2 (de) |
EP (1) | EP1859454B1 (de) |
AT (1) | ATE433188T1 (de) |
DE (2) | DE102005011467B4 (de) |
WO (1) | WO2006097254A2 (de) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005016656A1 (de) * | 2005-01-26 | 2006-08-10 | Smiths Heimann Gmbh | Kollimator mit einstellbarer Brennweite |
DE102008055921B4 (de) * | 2008-11-05 | 2010-11-11 | Siemens Aktiengesellschaft | Modulierbarer Strahlenkollimator |
US9117564B2 (en) | 2012-07-05 | 2015-08-25 | American Science And Engineering, Inc. | Variable angle collimator |
US9417340B2 (en) * | 2012-07-06 | 2016-08-16 | Morpho Detection, Llc | Compact geometry CT system |
CN104754848B (zh) * | 2013-12-30 | 2017-12-08 | 同方威视技术股份有限公司 | X射线发生装置以及具有该装置的x射线透视成像系统 |
KR20180041763A (ko) | 2015-09-10 | 2018-04-24 | 아메리칸 사이언스 앤 엔지니어링, 인크. | 선형 적응적 전자기 x-선 스캐닝을 이용한 후방산란 특성화 |
US11193898B1 (en) | 2020-06-01 | 2021-12-07 | American Science And Engineering, Inc. | Systems and methods for controlling image contrast in an X-ray system |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3197638A (en) * | 1963-01-21 | 1965-07-27 | Kenneth F Sinclair | Backscatter flaw detection system |
US3373286A (en) * | 1964-09-18 | 1968-03-12 | Industrial Nucleonics Corp | Device for measuring the characteristics of a material moving on a conveyor with means for minimizing the effect of flutter |
AT285756B (de) * | 1969-02-20 | 1970-11-10 | Otto Dipl Ing Dr Techn Kratky | Blendenanordnung zur Begrenzung eines Röntgenstrahlenbündels |
US4086494A (en) * | 1976-12-17 | 1978-04-25 | Malak Stephen P | Radiation collimator for use with high energy radiation beams |
FI64722C (fi) * | 1982-07-08 | 1983-12-12 | Instrumentarium Oy | Roentgenstraolkollimator |
US4809312A (en) * | 1986-07-22 | 1989-02-28 | American Science And Engineering, Inc. | Method and apparatus for producing tomographic images |
US4825454A (en) * | 1987-12-28 | 1989-04-25 | American Science And Engineering, Inc. | Tomographic imaging with concentric conical collimator |
DE3909147A1 (de) * | 1988-09-22 | 1990-09-27 | Philips Patentverwaltung | Anordnung zur messung des impulsuebertrages |
DE4137242A1 (de) * | 1991-11-13 | 1993-05-19 | Philips Patentverwaltung | Kollimator zum ausblenden von roentgenstrahlung |
IL118496A0 (en) * | 1996-05-30 | 1996-09-12 | Ein Gal Moshe | Collimators |
DE19954662B4 (de) * | 1999-11-13 | 2004-06-03 | Smiths Heimann Gmbh | Vorrichtung und Verfahren zum Detektieren von unzulässigen Reisegepäckgegenständen |
DE19954661C2 (de) * | 1999-11-13 | 2001-12-06 | Heimann Systems Gmbh & Co | Vorrichtung und Verfahren zur Justage eines Kollimators |
DE19954663B4 (de) * | 1999-11-13 | 2006-06-08 | Smiths Heimann Gmbh | Verfahren und Vorrichtung zur Bestimmung eines Materials eines detektierten Gegenstandes |
US6542578B2 (en) * | 1999-11-13 | 2003-04-01 | Heimann Systems Gmbh | Apparatus for determining the crystalline and polycrystalline materials of an item |
DE10330521A1 (de) | 2003-07-05 | 2005-02-10 | Smiths Heimann Gmbh | Gerät und Verfahren zur Überprüfung von Gegenständen |
US7075073B1 (en) * | 2004-05-21 | 2006-07-11 | Kla-Tencor Technologies Corporation | Angle resolved x-ray detection |
-
2005
- 2005-03-12 DE DE102005011467A patent/DE102005011467B4/de not_active Expired - Fee Related
-
2006
- 2006-03-10 EP EP06723364A patent/EP1859454B1/de active Active
- 2006-03-10 WO PCT/EP2006/002252 patent/WO2006097254A2/de not_active Application Discontinuation
- 2006-03-10 DE DE502006003884T patent/DE502006003884D1/de active Active
- 2006-03-10 AT AT06723364T patent/ATE433188T1/de active
-
2007
- 2007-09-12 US US11/854,535 patent/US7436934B2/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2006097254A2 * |
Also Published As
Publication number | Publication date |
---|---|
WO2006097254A3 (de) | 2006-12-28 |
DE502006003884D1 (de) | 2009-07-16 |
ATE433188T1 (de) | 2009-06-15 |
EP1859454B1 (de) | 2009-06-03 |
US20080089478A1 (en) | 2008-04-17 |
DE102005011467A1 (de) | 2006-09-14 |
WO2006097254A2 (de) | 2006-09-21 |
DE102005011467B4 (de) | 2008-02-28 |
US7436934B2 (en) | 2008-10-14 |
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