EP0224786B1 - Röntgenstrahler - Google Patents

Röntgenstrahler Download PDF

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Publication number
EP0224786B1
EP0224786B1 EP86115942A EP86115942A EP0224786B1 EP 0224786 B1 EP0224786 B1 EP 0224786B1 EP 86115942 A EP86115942 A EP 86115942A EP 86115942 A EP86115942 A EP 86115942A EP 0224786 B1 EP0224786 B1 EP 0224786B1
Authority
EP
European Patent Office
Prior art keywords
tube
ray
anode
cathode
rays
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
EP86115942A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0224786A1 (de
Inventor
Klaus Dr. Haberrecker
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.)
Siemens AG
Original Assignee
Siemens AG
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 AG filed Critical Siemens AG
Publication of EP0224786A1 publication Critical patent/EP0224786A1/de
Application granted granted Critical
Publication of EP0224786B1 publication Critical patent/EP0224786B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J35/00—X-ray tubes
    • H01J35/24—Tubes wherein the point of impact of the cathode ray on the anode or anticathode is movable relative to the surface thereof
    • H01J35/30—Tubes wherein the point of impact of the cathode ray on the anode or anticathode is movable relative to the surface thereof by deflection of the cathode ray
    • H01J35/305—Tubes wherein the point of impact of the cathode ray on the anode or anticathode is movable relative to the surface thereof by deflection of the cathode ray by using a rotating X-ray tube in conjunction therewith
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J35/00—X-ray tubes
    • H01J35/02—Details
    • H01J35/14—Arrangements for concentrating, focusing, or directing the cathode ray
    • H01J35/153—Spot position control
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05G—X-RAY TECHNIQUE
    • H05G1/00—X-ray apparatus involving X-ray tubes; Circuits therefor
    • H05G1/08—Electrical details
    • H05G1/26—Measuring, controlling or protecting
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05G—X-RAY TECHNIQUE
    • H05G1/00—X-ray apparatus involving X-ray tubes; Circuits therefor
    • H05G1/08—Electrical details
    • H05G1/26—Measuring, controlling or protecting
    • H05G1/30—Controlling
    • H05G1/52—Target size or shape; Direction of electron beam, e.g. in tubes with one anode and more than one cathode

Definitions

  • the invention relates to x-ray emitters according to the preamble of claim 1.
  • Such emitters are known, for example, from EP-A 0 154 699.
  • GB-PS 365 432 describes an X-ray emitter that comes from the time when the principle of rotating anodes was introduced in X-ray technology.
  • the tube with rigidly installed cathode and anode should be rotated around the longitudinal axis of the arrangement.
  • the electron beam generated in the center was deflected radially and held magnetically. Due to mechanical difficulties, this solution was not able to prevail.
  • the thermal expansion of parts of the tube that occur during manufacture or operation can also lead to geometrical changes in the position of the electrodes, etc., which likewise undesirably influence the beam and its position.
  • the rotating anode can also exert such an influence because the rotation can act on vibrations.
  • the invention has for its object to achieve a defined position of the focal spot and uniform distribution of the radiation in the emitted X-ray beam in an X-ray emitter according to the preamble of claim 1 and to keep the effort required low. This object is achieved with the measures specified in the features of the characterizing part of patent claim 1. Advantageous refinements and developments are the subject of the dependent claims.
  • the invention is based on the fact that a lateral stabilization of the position of the focus with respect to the radius of the focal spot path in the case of rotating anode X-ray tubes leads to a sufficiently uniform radiation.
  • the narrow side of the focal spot lies in this direction. Its long side lies in the direction of the radius of the anode.
  • a shift of the focal spot in the radial direction only works with the sine of the beam angle. A shift to this is fully effective. This simplifies the stabilization of the focal spot. You can limit yourself to the focal spot in only one direction, i.e. in the direction of the focal spot path running transverse to the radius. A significant influence can only be expected in this tangential direction.
  • the effect of the magnetic field can be promoted in that the cathode head and possibly also the anode are made from non-magnetic material.
  • Stabilization in the sense of the invention can be achieved simply by placing an electro-optical element in the lateral boundary of the X-ray and / or light beam emanating from the focal spot in such a way that its radiation entry surface is only partially illuminated by the beam.
  • a shift in the boundary of the beam then results in a change in the ratio of the irradiated and unirradiated part of the element.
  • a correction control signal can be obtained from the determination of this change.
  • the cathode head of which is made of magnetic material, e.g. Nickel or special soft iron the current to be generated to generate the stabilizing magnetic field can be reduced by 70% when using a non-magnetic cathode head.
  • the cathode head can also consist of a ceramic, such as aluminum oxide, and be coated with a high work function.
  • the coil can also be used to deflect the electron beam and thus the focal spot in a defined manner, for example two discrete positions with a distance of 1 to 2 mm from one another. Since such coils can only be installed over a large area around the tube and not in the tube itself, high currents and voltages are required for the required magnetic fields. When the cathode head is made from non-magnetic material, the electrical outlay drops considerably. In addition, there are no remanence fields, which can have an undefined influence on the position of the focus.
  • the rotating anode tube 2 has a cathode arrangement 3 and an anode arrangement 4 in a known manner.
  • the cathode arrangement 3 contains a cathode head 5 which contains a hot cathode which consists of two separately switchable parts.
  • an anode plate 6 In front of the cathode head 5 is an anode plate 6, which is part of the anode arrangement 4.
  • the anode plate 6 is connected via a shaft 7 to a rotor 8, which is used in a known manner for rotating the anode plate 6.
  • a stator 9 is assigned to the rotor 8 on the outside of the rotating anode tube 2.
  • the tube hood 1 has a radiation exit tube 10 on the side facing the radiation exit of the tube 2.
  • the entire tube hood 1 is attached to an X-ray device or a special tripod in a known manner via a support arm 11.
  • the electrical supply lines are connected to the rotating anode tube 2 via connections 12 and 13.
  • the supply lines 14, 15, 16 for the cathode 4 are carried out at the connection 12 and a line 17 for applying the anode voltage at the connection 13, while the lines 18 and 19 deliver the operating current of the stator 9.
  • the rotating anode tube 2 is operated in a known manner by applying a heating voltage for the cathode arrangement 3 between the supply lines 14 and 15 or 16 or 14 and 16 and also the tube voltage between one of the supply lines 14 to 16 and the line 17. Then an electron beam 20 emerges from the cathode head 5. It strikes the anode plate 6 in the focal spot 21. An x-ray beam 22 is then triggered there, which can leave the radiator through the radiation exit tube 10.
  • a detector 25 is assigned to the x-ray beam 22. It is struck by the edge beam 26 forming the lateral edge of the X-ray beam 22.
  • the detector 25 is mounted in the radiation exit tube 10 such that it has an optical connection with the focal spot 21.
  • An optoelectric converter is provided as the detector 25, which emits electrical signals in the sense of deviations of the focal spot 21 from the desired location by changing its conductivity in accordance with the size of the irradiated area.
  • the detector 25 is connected to a control unit 28 via a line 27. From there a corresponding actuation of a coil 32 then takes place via a current source 29 which can be influenced by the control unit 28 via lines 30 and 31.
  • a double arrow 33 indicates that the coil 32 can be supplied in both directions. The direction is predetermined by the signal supplied by the detector 25. As a result, if the focal spot 21 deviates from the desired location, the electron beam 20 is returned to the focal spot 21 by changing the field of the coil 32 accordingly.
  • the coil 32 is arranged parallel to the electron beam 20 and, in the direction of the center of the anode plate 6 of the rotating anode, builds up a magnetic field parallel to the central beam 23 of the X-ray beam 22. With this, deflection of the electron beam 20 is then possible in the desired manner. Influencing of the magnetic field generated in the coil 32 by the cathode head 5 is excluded because it consists of Remanit 4550, for example, and is therefore non-magnetic.
  • the control unit 28 can also be assigned a switching device 34 with which a change in the current supplying the coil 32 in the sense of a lateral displacement of the focal spot 21 can be effected in the current source 29.
  • a switching device 34 with which a change in the current supplying the coil 32 in the sense of a lateral displacement of the focal spot 21 can be effected in the current source 29.
  • Such a shift makes it possible to adjust the focal spot 21 or e.g. set a distance of the shift that is suitable for producing stereo recordings.

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • X-Ray Techniques (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
EP86115942A 1985-11-28 1986-11-17 Röntgenstrahler Expired - Lifetime EP0224786B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853542127 DE3542127A1 (de) 1985-11-28 1985-11-28 Roentgenstrahler
DE3542127 1985-11-28

Publications (2)

Publication Number Publication Date
EP0224786A1 EP0224786A1 (de) 1987-06-10
EP0224786B1 true EP0224786B1 (de) 1990-02-28

Family

ID=6287107

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86115942A Expired - Lifetime EP0224786B1 (de) 1985-11-28 1986-11-17 Röntgenstrahler

Country Status (4)

Country Link
US (1) US4819260A (enrdf_load_stackoverflow)
EP (1) EP0224786B1 (enrdf_load_stackoverflow)
JP (1) JPH0334828Y2 (enrdf_load_stackoverflow)
DE (2) DE3542127A1 (enrdf_load_stackoverflow)

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IL91119A0 (en) * 1989-07-26 1990-03-19 Elscint Ltd Arrangement for controlling focal spot position in x-ray tubes
US5581591A (en) * 1992-01-06 1996-12-03 Picker International, Inc. Focal spot motion control for rotating housing and anode/stationary cathode X-ray tubes
KR100198515B1 (ko) * 1994-02-03 1999-06-15 토비 에취. 쿠스머 주사이미지의 질을 개선하기 위한 x선 단층촬영시스템과 방법
US5841829A (en) 1997-05-13 1998-11-24 Analogic Corporation Optimal channel filter for CT system with wobbling focal spot
DE19832972A1 (de) 1998-07-22 2000-01-27 Siemens Ag Röntgenstrahler
BE1012248A6 (fr) * 1998-10-26 2000-08-01 Ind Control Machines S A Dispositif de controle a rayons x
FR2829286B1 (fr) * 2001-09-03 2008-04-04 Ge Med Sys Global Tech Co Llc Dispositif et procede d'emission de rayons x
US6968039B2 (en) * 2003-08-04 2005-11-22 Ge Medical Systems Global Technology Co., Llc Focal spot position adjustment system for an imaging tube
US7257194B2 (en) * 2004-02-09 2007-08-14 Varian Medical Systems Technologies, Inc. Cathode head with focal spot control
US7428298B2 (en) * 2005-03-31 2008-09-23 Moxtek, Inc. Magnetic head for X-ray source
US7661445B2 (en) * 2005-12-19 2010-02-16 Varian Medical Systems, Inc. Shielded cathode assembly
US20100020938A1 (en) * 2006-12-12 2010-01-28 Koninklijke Philips Electronics N.V. Device and method for x-ray tube focal spot size and position control
US7737424B2 (en) * 2007-06-01 2010-06-15 Moxtek, Inc. X-ray window with grid structure
US20110121179A1 (en) * 2007-06-01 2011-05-26 Liddiard Steven D X-ray window with beryllium support structure
EP2167632A4 (en) * 2007-07-09 2013-12-18 Univ Brigham Young METHODS AND DEVICES FOR HANDLING CHARGED MOLECULES
WO2009019791A1 (ja) 2007-08-09 2009-02-12 Shimadzu Corporation Ｘ線管装置
US9305735B2 (en) 2007-09-28 2016-04-05 Brigham Young University Reinforced polymer x-ray window
US8498381B2 (en) 2010-10-07 2013-07-30 Moxtek, Inc. Polymer layer on X-ray window
EP2190778A4 (en) * 2007-09-28 2014-08-13 Univ Brigham Young CARBON NANO TUBE ASSEMBLY
WO2009085351A2 (en) * 2007-09-28 2009-07-09 Brigham Young University X-ray window with carbon nanotube frame
US20100239828A1 (en) * 2009-03-19 2010-09-23 Cornaby Sterling W Resistively heated small planar filament
US8247971B1 (en) 2009-03-19 2012-08-21 Moxtek, Inc. Resistively heated small planar filament
US7983394B2 (en) * 2009-12-17 2011-07-19 Moxtek, Inc. Multiple wavelength X-ray source
CN102711618B (zh) * 2010-01-08 2015-05-20 皇家飞利浦电子股份有限公司 利用组合的x和y焦斑偏转方法的x射线管
US8995621B2 (en) 2010-09-24 2015-03-31 Moxtek, Inc. Compact X-ray source
US8526574B2 (en) 2010-09-24 2013-09-03 Moxtek, Inc. Capacitor AC power coupling across high DC voltage differential
US8804910B1 (en) 2011-01-24 2014-08-12 Moxtek, Inc. Reduced power consumption X-ray source
US8750458B1 (en) 2011-02-17 2014-06-10 Moxtek, Inc. Cold electron number amplifier
US8929515B2 (en) 2011-02-23 2015-01-06 Moxtek, Inc. Multiple-size support for X-ray window
US8792619B2 (en) 2011-03-30 2014-07-29 Moxtek, Inc. X-ray tube with semiconductor coating
US9174412B2 (en) 2011-05-16 2015-11-03 Brigham Young University High strength carbon fiber composite wafers for microfabrication
US8989354B2 (en) 2011-05-16 2015-03-24 Brigham Young University Carbon composite support structure
US9076628B2 (en) 2011-05-16 2015-07-07 Brigham Young University Variable radius taper x-ray window support structure
US8817950B2 (en) 2011-12-22 2014-08-26 Moxtek, Inc. X-ray tube to power supply connector
US8761344B2 (en) 2011-12-29 2014-06-24 Moxtek, Inc. Small x-ray tube with electron beam control optics
US9524845B2 (en) 2012-01-18 2016-12-20 Varian Medical Systems, Inc. X-ray tube cathode with magnetic electron beam steering
US9173623B2 (en) 2013-04-19 2015-11-03 Samuel Soonho Lee X-ray tube and receiver inside mouth
DE102013107736A1 (de) * 2013-07-19 2015-01-22 Ge Sensing & Inspection Technologies Gmbh Röntgenprüfvorrichtung für die Materialprüfung und Verfahren zur Erzeugung hochaufgelöster Projektionen eines Prüflings mittels Röntgenstrahlen
DE102014015974B4 (de) * 2014-10-31 2021-11-11 Baker Hughes Digital Solutions Gmbh Anschlusskabel zur Verminderung von überschlagsbedingten transienten elektrischen Signalen zwischen der Beschleunigungsstrecke einer Röntgenröhre sowie einer Hochspannungsquelle
JP2016162525A (ja) * 2015-02-27 2016-09-05 東芝電子管デバイス株式会社 Ｘ線管装置

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Also Published As

Publication number Publication date
EP0224786A1 (de) 1987-06-10
US4819260A (en) 1989-04-04
JPH0334828Y2 (enrdf_load_stackoverflow) 1991-07-24
DE3542127A1 (de) 1987-06-04
DE3669233D1 (de) 1990-04-05
JPS6292554U (enrdf_load_stackoverflow) 1987-06-13

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