WO2013007484A1 - Source de rayons x monochromatique - Google Patents

Source de rayons x monochromatique Download PDF

Info

Publication number
WO2013007484A1
WO2013007484A1 PCT/EP2012/061786 EP2012061786W WO2013007484A1 WO 2013007484 A1 WO2013007484 A1 WO 2013007484A1 EP 2012061786 W EP2012061786 W EP 2012061786W WO 2013007484 A1 WO2013007484 A1 WO 2013007484A1
Authority
WO
WIPO (PCT)
Prior art keywords
anode
electrons
arrangement according
collector
arrangement
Prior art date
Application number
PCT/EP2012/061786
Other languages
German (de)
English (en)
Inventor
Oliver Heid
Timothy Hughes
Svetlana Levchuk
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2013007484A1 publication Critical patent/WO2013007484A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J35/00—X-ray tubes
    • H01J35/02—Details
    • H01J35/04—Electrodes ; Mutual position thereof; Constructional adaptations therefor
    • H01J35/08—Anodes; Anti cathodes
    • H01J35/112—Non-rotating anodes
    • H01J35/116—Transmissive anodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2235/00—X-ray tubes
    • H01J2235/08—Targets (anodes) and X-ray converters
    • H01J2235/081—Target material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2235/00—X-ray tubes
    • H01J2235/08—Targets (anodes) and X-ray converters
    • H01J2235/086—Target geometry
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2235/00—X-ray tubes
    • H01J2235/12—Cooling
    • H01J2235/1204—Cooling of the anode

Definitions

  • Monochromatic X-ray source the present invention relates to an arrangement for the generation ⁇ supply of X-rays and an X-ray device.
  • Previously known X-ray sources are, for example, X-ray tubes, which generate a wide wavelength spectrum of X-ray radiation.
  • the bremsstrahlung is included in the wavelength spectrum.
  • the minimization of the X-ray dose with the same image quality is the highest goal.
  • the Bremsstrahlung should be reduced.
  • contrast agents to improve the image quality, in particular the contrast, in particular iodinated contrast media.
  • the arrangement according to the invention for generating X-ray radiation comprises an electron source for emitting an electron beam, an anode and a collector.
  • the electron source and the anode are designed such that upon application of a positive electrical potential to the anode, electrons from the electron source can be accelerated in the direction of the anode.
  • an electron source can, for. Legs
  • Electron gun or a cold cathode can be used.
  • An electron source thus supplies the electrons, which are accelerated towards the anode.
  • the anode is so out ⁇ staltet is that emitted electrons upon interaction with X-rays from the anode and the collector is so arranged and constructed that advertising electrons which penetrate the anode, braked by the collector and collected the.
  • the arrangement with the collector has the advantage that all braked and trapped electrons can not generate any further Bremsstrahlung within the arrangement. That is to say that the slowing down and interception of the electrons passed through the anode reduces the bremsstrahlung which would or would only arise in the system after penetration of the anode.
  • Another advantage of the arrangement with the collector is the reduction of heat generation by interaction of electrons in the shielding material.
  • the collector is therefore not just a standard shielding of the electrons.
  • the arrangement has an active collector which decelerates and collects the electrons, so that electron losses prevented ⁇ the, no additional bremsstrahlung is formed in a shield and thus the heat generation is minimized.
  • the collector of the arrangement is designed as part of an electrical circuit, so that the trapped electrons are held in the circuit, whereby electrical power losses are minimized.
  • the electrons are therefore not verlo ⁇ reindeer, but can the collector as part of the Circuit is switched, the X-ray generation are fed back.
  • the arrangement according to the invention is highly electrically effective. Pay particular attention to the collector of an electric Po ⁇ tential applied. This advantageously serves to decelerate the incoming electrons.
  • the collector is designed in particular so that the incoming electrons an electric field, which is effected by this applied electrical potential, pass through and are decelerated therein.
  • the voltage applied to the collector also causes the electrons passing through the anode to be aligned with the collector. This has the advantage that when hitting the collector or on a shield after passing through this electric field, the electrons have only so low energies that no or at least hardly Bremsstrahlung is generated.
  • the anode comprises at least one thin target layer whose layer thickness is less than the electron range in the material of the layer.
  • This target layer of the anode is used to generate the characteristic X-radiation.
  • the small layer thickness ensures that only a minimum of bremsstrahlung is generated at all.
  • the anode is in particular designed such that it serves exclusively to generate the X-radiation, in particular the characteristic X-radiation, and not also to decelerate the electrons.
  • the layer thickness would advantageously be 8 ⁇ m or less.
  • the target layer comprises in particular a material which has an atomic number between 42 and 74.
  • Materia ⁇ lien this atomic number are suitable for the generation of X-rays. These are, for example, molybdenum with the atomic number 42 or tungsten with the atomic number 74.
  • the anode comprises a holder on which the thin tar ⁇ get Mrs is arranged.
  • the holder is a
  • the holder is in particular a flat disc, on which the thin target layer can be applied.
  • the holder may in particular have different geometries.
  • the thin target layer is in particular a metal layer, which can be applied to the mount, for example, by known deposition methods.
  • the holder may be a diamond wheel.
  • the thickness of the holder is in particular ⁇ special again lower than the electron range in the disc material. This has the advantage that even in the Hal ⁇ sion little bremsstrahlung is generated by interaction with the electrons. The electrons should leave the holder as far as possible with only little interaction and only be slowed down and collected by the collector.
  • the anode is thus preferably so thin that it is penetrated by the electrons. Due to the small overall thickness of target layer and holder, the advantage is thus ensured of generating only minimal bremsstrahlung. In particular ⁇ sondere the thinness of the support also causes mi ⁇ nimATOR heat development due to electron interaction.
  • the material of the holder has in particular an atomic number of 15 or lower. It is just about not to produce unwanted X-rays, no additional characteristic radiation of different wavelengths.
  • the atomic number of the support material should in particular be less than 15.
  • the anode has a plurality of target layers, which has materials of different atomic number. This has the advantage that with this arrangement, characteristic X-radiation of different energy ⁇ , depending on the target material can be produced. Different X-ray energies are necessary, for example, in order to adapt the radiation to the respectively required application or, in the case of diagnostic applications, to adapt the radiation energy to the patient. Depending on the dimensions of the patient, the energy of the X-ray radiation has to be adjusted in order to achieve a sufficiently high contrast
  • the materials of the target layers in particular at least 10 chairs vary in their atomic number of at least 3, such as at least 5, the Atomzah ⁇ len too close together, this also applies to the generatable characteristic radiation too.
  • target materials for example molybdenum and gadolinium or gadolinium and tungsten come into question.
  • the electron source is arranged to the anode and / or is in the arrangement of a device for guiding an electron beam comprises, so that the electrons can be accelerated perpendicular to the anode. This has the advantage that the electrons in the shortest path for the penetration of the
  • Anode can be sent, and thus in the anode only generate mi ⁇ nimal bremsstrahlung and ensure heat.
  • the anode and the electron source are arranged to be movable relative to each other, so that each target layer can be positioned in the electron beam. This has the advantage that characteristic X-ray radiation with adjustable energy can be generated with one and the same arrangement having only one electron source and one collector and only one anode structure.
  • the arrangement also has a shield, which is connected to the anode so that all not positioned in the electron beam target layers are shielded by this shield so that the target layers are not contaminated with material of the positioned in the electron beam target.
  • the arrangement with several different target layers allows the setting of a characteristic wavelength. This arrangement is of particular advantage for diagnostic methods in which different x-ray energies are used.
  • the different images can also be advantageously used in subtraction angiography.
  • the X-ray device comprises a ⁇ An order for generating X-radiation with an electron source for emitting an electron beam, an anode and a collector.
  • Electron source and the anode are configured to be accelerated upon the application of a positive electrical ⁇ 's potential to the anode electrons from the electron source toward an anode, wherein the anode is configured to emit X-ray radiation upon interaction with electrons and wherein the collector so on - ordered and designed to electron, which penetrate the anode, decelerate and catch. All other embodiments of the arrangement are also encompassed, for example, by the X-ray device. This then also has the ⁇ written benefits of the invention.
  • the arrangement according to the invention particularly improves the diagnostic applications of X-ray radiation, such as, for example, subtraction angiography.
  • X-ray radiation such as, for example, subtraction angiography.
  • Embodiments of the present invention will be described by way of example with reference to FIGS . 1 to 4 of the attached drawing. Showing:
  • FIG. 1 shows the schematic arrangement of electron source
  • FIG 2 to Figure 4 shows the schematic arrangement with an anode 20 with multiple targets 211, 212nd
  • FIG. 1 schematically shows a cross section through the arrangement for generating X-ray radiation.
  • the electron source 1 is generally shown as a rectangle. This can be arranged on an axis with anode 20 and collector 3, as shown in Figure 1, but can also be arranged laterally offset from this axis.
  • the electron source 1 can not initially be applied directly to the anode 20. be directed and the emitted electron beam is then z. B. directed by another device for deflecting the electrons to the anode 20.
  • the anode 20 is greatly simplified as a rectangle Darge ⁇ provides. From the side of the electron source 1, the anode 20 comprises the target 21, a thin layer on the holder 22. In the electron direction behind the anode 20, the collector 3 is still shown. This is in turn shown greatly simplified as a rectangle with trapezoidal cutout. This section indicates the inlet for the electrons. In this cavity, which is shown in cross-section, an electromagnetic field for decelerating the electrons can be generated.
  • the electrons can reach arbitrary paths, but the electron source 1 and the anode 20 are arranged and configured so that the electron beam strikes the anode 20 perpendicularly.
  • the holder 22 it is in particular a flat disc on which the thin target layer 22 is playing as applied as a coating at ⁇ .
  • the material of the holder 22 is a material of low atomic number, in particular less than 15, since it is intended to generate only the lowest possible X-ray radiation by interaction of the electrons.
  • the material of the holder 22 is a diamond disk.
  • the coating with the target material 21, however, has a high atomic number, in particular between 42 and 74.
  • the arrangement with the collector 3 has the advantage that it is part of the circuit.
  • the collector 3 can be brought to an electrical potential, which decelerates the electrons before impinging on further material. This has the advantage of minimizing the heat generated by the electron interaction. Furthermore the further generation of Bremsstrahlung is minimized by interaction of the electrons with the collector material.
  • the collector 3 as part of the circuit, the electrons are not only collected, but can continue to be used. That is, by collecting the electrons, the entire assembly becomes electrically much more efficient than previous arrangements in which the once-emitted electrons were lost.
  • FIG. 2 shows, in the same schematic representation as in FIG.
  • FIG. 1 an embodiment of the arrangement with a plurality of target layers 211, 212.
  • the anode 20 is shown again schematically as a rectangle, with the holder 22 on which the thin target layers 211, 212 are applied.
  • brin supply known coating methods can be used, depending on which target material to it han delt to ⁇ .
  • a shield 23 is shown very schematically. This shielding, shown in cross-section, is intended to ensure contamination of the respectively unused target 211, 212.
  • Figures 3 and 4 show the same structure as in Figure 2, except that each one of the target layer 211 was 212 sitioned so po- that the electron makes this vertically and centrally enters after passing through the anode 20 into the Kol ⁇ lecturer. 3
  • the direction of the electron is indicated by an arrow from the electron source 1 to the anode 20.
  • the electrons are accelerated to the anode with different energies El, E2, ie different anode potentials.
  • 212 a entspre ⁇ sponding acceleration voltage for the electrons from the electron source 1 is applied to the anode 20th
  • the electrons in the respective target material can generate characteristic X-radiation.
  • the electrons that have penetrated the anode 20 and then hit the collector 3 can turn there be braked with adjusted potential. That is, the Kol ⁇ lecturer 3 is especially designed so that it can decelerate electrons of different energy.
  • tungsten can be used as the second target material 212 ⁇ the first target material 211 and molybdenum.
  • the characteristic K a -line energy for tungsten is around 59 keV, for molybdenum it is around 17 keV. Accordingly, the electrons are accelerated to the molybdenum target with a lower anode voltage than to the tungsten target. For example, electrons of 2 to 3 times, in particular up to 4 times, energy are used. The anode voltages are therefore in particular in a range between about 40 kV up to 240 kV.

Landscapes

  • X-Ray Techniques (AREA)

Abstract

La présente invention concerne un système destiné à générer des rayons X et un appareil à rayons X pourvu d'une source d'électrons (1), d'une anode (20) laquelle émet des rayons X lorsqu'elle entre interaction avec des électrons incidents et d'un collecteur (3) lequel freine et absorbe les électrons qui pénètrent dans l'anode (20). Grâce au freinage et à l'absorption des électrons ayant pénétré à travers l'anode (20), on évite une interaction ultérieure de ces électrons, par exemple avec le blindage dudit système, et on réduit au minimum la génération indésirable d'un rayonnement de freinage supplémentaire. Les pertes de puissance électrique sont également réduites au minimum. La disposition, sur le support (22) de l'anode (20), de plusieurs cibles (21) pourvues de matériaux ayant différents numéros atomiques permet de générer des rayons X caractéristiques ayant différentes énergies, en adéquation avec l'application diagnostique concernée ou avec les exigences découlant de la taille du patient.
PCT/EP2012/061786 2011-07-14 2012-06-20 Source de rayons x monochromatique WO2013007484A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011079179.5 2011-07-14
DE102011079179A DE102011079179A1 (de) 2011-07-14 2011-07-14 Monochromatische Röntgenquelle

Publications (1)

Publication Number Publication Date
WO2013007484A1 true WO2013007484A1 (fr) 2013-01-17

Family

ID=46384370

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2012/061786 WO2013007484A1 (fr) 2011-07-14 2012-06-20 Source de rayons x monochromatique

Country Status (2)

Country Link
DE (1) DE102011079179A1 (fr)
WO (1) WO2013007484A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112071730A (zh) * 2019-06-11 2020-12-11 西门子医疗有限公司 X射线管、x射线装置和乳房x射线摄影装置

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013208104A1 (de) * 2013-05-03 2014-11-20 Siemens Aktiengesellschaft Röntgenquelle und bildgebendes System
DE102013208103A1 (de) * 2013-05-03 2014-11-06 Siemens Aktiengesellschaft Röntgenquelle und bildgebendes System
DE102013209447A1 (de) * 2013-05-22 2014-11-27 Siemens Aktiengesellschaft Röntgenquelle und Verfahren zur Erzeugung von Röntgenstrahlung
DE102013220189A1 (de) * 2013-10-07 2015-04-23 Siemens Aktiengesellschaft Röntgenquelle und Verfahren zur Erzeugung von Röntgenstrahlung

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0432568A2 (fr) * 1989-12-11 1991-06-19 General Electric Company Anode pour tube à rayons X et tube l'utilisant
JP2001176408A (ja) * 1999-12-15 2001-06-29 New Japan Radio Co Ltd 電子管
US20030108155A1 (en) * 2000-06-22 2003-06-12 Wilkins Stephen William X-ray micro-target source
US20080084966A1 (en) * 2006-02-01 2008-04-10 Toshiba Electron Tubes & Devices Co., Ltd. X-ray source and fluorescent X-ray analyzing apparatus
US20080144774A1 (en) * 2003-04-25 2008-06-19 Crx Limited X-Ray Tubes
US7436931B2 (en) 2002-12-11 2008-10-14 Koninklijke Philips Electronics N.V. X-ray source for generating monochromatic x-rays
DE102009035439A1 (de) * 2009-07-31 2010-08-12 Siemens Aktiengesellschaft Röntgen-CT-System zur tomographischen Darstellung eines Untersuchungsobjektes, aufweisend eine Röntgenröhre zur Erzeugung von Röntgenstrahlung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3239706A (en) * 1961-04-17 1966-03-08 High Voltage Engineering Corp X-ray target
JPS61140041A (ja) * 1984-12-11 1986-06-27 Hamamatsu Photonics Kk マルチスペクトルｘ線発生管
EP1488441A2 (fr) * 2002-01-31 2004-12-22 The Johns Hopkins University Source de rayons x et procede pour la production plus efficace de frequences de rayons x au choix
CN102668012A (zh) * 2009-10-28 2012-09-12 皇家飞利浦电子股份有限公司 具有电子散射元件的x射线发生装置和x射线系统

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0432568A2 (fr) * 1989-12-11 1991-06-19 General Electric Company Anode pour tube à rayons X et tube l'utilisant
JP2001176408A (ja) * 1999-12-15 2001-06-29 New Japan Radio Co Ltd 電子管
US20030108155A1 (en) * 2000-06-22 2003-06-12 Wilkins Stephen William X-ray micro-target source
US7436931B2 (en) 2002-12-11 2008-10-14 Koninklijke Philips Electronics N.V. X-ray source for generating monochromatic x-rays
US20080144774A1 (en) * 2003-04-25 2008-06-19 Crx Limited X-Ray Tubes
US20080084966A1 (en) * 2006-02-01 2008-04-10 Toshiba Electron Tubes & Devices Co., Ltd. X-ray source and fluorescent X-ray analyzing apparatus
DE102009035439A1 (de) * 2009-07-31 2010-08-12 Siemens Aktiengesellschaft Röntgen-CT-System zur tomographischen Darstellung eines Untersuchungsobjektes, aufweisend eine Röntgenröhre zur Erzeugung von Röntgenstrahlung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112071730A (zh) * 2019-06-11 2020-12-11 西门子医疗有限公司 X射线管、x射线装置和乳房x射线摄影装置
CN112071730B (zh) * 2019-06-11 2024-04-30 西门子医疗有限公司 X射线管、x射线装置和乳房x射线摄影装置

Also Published As

Publication number Publication date
DE102011079179A1 (de) 2013-01-17

Similar Documents

Publication Publication Date Title
DE102009003673B4 (de) Elektronenquelle auf der Basis von Feldemittern mit minimierten Strahl-Emittanzwachstum
DE69124547T2 (de) Röntgenanalysegerät, insbesondere Computertomograph
EP1883093B1 (fr) Tomodensitomètre
EP0584871B1 (fr) Tube à rayons X ayant une anode en mode de transmission
DE102014202330B3 (de) Single Source DualEnergy mit zwei Filtern zur Röntgenspektrumsdifferenzierung bei Strahlerblenden mit Schlitzplatte
DE202013105804U1 (de) Vorrichtungen zum Erzeugen verteilter Röntgenstrahlen
DE112011102783T5 (de) Dickwandige Targets für Transmissions-Röntgenröhren
DE102008007413A1 (de) Röntgentarget
DE102010061584A1 (de) Röntgenstrahlkathode und Verfahren zum Herstellen derselben
DE102007046278A1 (de) Röntgenröhre mit Transmissionsanode
DE102008050352B4 (de) Multi-Strahl-Röntgenvorrichtung
DE19544203A1 (de) Röntgenröhre, insbesondere Mikrofokusröntgenröhre
WO2013007484A1 (fr) Source de rayons x monochromatique
DE102009039345A1 (de) Vorrichtung zur Bestrahlungsfeldkontrolle bei radiologischen Strahlentherapiegeräten
EP0021441B1 (fr) Accélérateur d'électrons pour radiothérapie aux rayons X
DE102013209447A1 (de) Röntgenquelle und Verfahren zur Erzeugung von Röntgenstrahlung
DE2441968C3 (de) Röntgenröhre zur Erzeugung monochromatischer Röntgenstrahlung
DE102010022851A1 (de) Röntgenstrahlungsvorrichtung zur Erzeugung von quasimonochromatischer Röntgenstrahlung und Radiographie-Röntgenaufnahmesystem
DE102013220189A1 (de) Röntgenquelle und Verfahren zur Erzeugung von Röntgenstrahlung
DE102012011309B4 (de) Röntgenstrahlröhre vom Transmissionstyp und Röntgenstrahlröhre vom Reflektionstyp
EP2979293A1 (fr) Source de rayons x et système d'imagerie
EP2301042B1 (fr) Cible radiographique et procédé de production de rayons x
DE102005018342B4 (de) Vorrichtung und Verfahren zur Erzeugung von Röntgenstrahlung
DE102010030713B4 (de) Röntgenquelle zur Erzeugung von Röntgenstrahlen mit einem Hohlkörpertarget und ein Verfahren zur Erzeugung von Röntgenstrahlung in einem Hohlkörpertarget
EP2885807B1 (fr) Dispositif doté d'une anode destinée à la génération de rayons x

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 12729956

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 12729956

Country of ref document: EP

Kind code of ref document: A1