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EP0685200A1 - Appareil de radiodiagnostic avec des spots électroniques - Google Patents

Appareil de radiodiagnostic avec des spots électroniques Download PDF

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Publication number
EP0685200A1
EP0685200A1 EP95105219A EP95105219A EP0685200A1 EP 0685200 A1 EP0685200 A1 EP 0685200A1 EP 95105219 A EP95105219 A EP 95105219A EP 95105219 A EP95105219 A EP 95105219A EP 0685200 A1 EP0685200 A1 EP 0685200A1
Authority
EP
European Patent Office
Prior art keywords
focal
diaphragm
aperture
focal spot
ray
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
EP95105219A
Other languages
German (de)
English (en)
Other versions
EP0685200B1 (fr
Inventor
Yngve Norhager
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 Elema AB
Original Assignee
Siemens Elema AB
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 Elema AB filed Critical Siemens Elema AB
Publication of EP0685200A1 publication Critical patent/EP0685200A1/fr
Application granted granted Critical
Publication of EP0685200B1 publication Critical patent/EP0685200B1/fr
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
    • 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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2235/00—X-ray tubes
    • H01J2235/06—Cathode assembly
    • H01J2235/068—Multi-cathode assembly

Definitions

  • the invention relates to an X-ray examination device with an X-ray tube comprising an anode plate with selectively switchable focal spots, which are arranged such that all are cut by a common straight line, and with a displaceable primary beam aperture.
  • Such an X-ray examination device is described in DE-OS 3 136 806.
  • the anode plate in the X-ray tube which can be rotated about its own axis, is provided with two focal spot tracks that are inclined at different angles to the plate plane.
  • the X-ray tube also comprises two cathodes, in which each cathode is directed to a focal spot path. With the aid of the cathodes, one focal spot is generated on each focal spot path, the focal spot of one path being, for example, larger than that of the other path.
  • the operator can switch on the cathode or focal spot that he or she finds most suitable in an examination, for example in a mammography examination.
  • the primary beam aperture must also be shifted so that the X-ray cone is directed against the object table, i.e. exactly the X-ray film sheet that is in or under the object table is pushed in, covers.
  • the primary radiation diaphragm or the primary radiation diaphragm housing can only be displaced laterally up to two end positions, the primary beam diaphragm being set in one end position in relation to one focal spot and in the other end position in relation to the other focal spot.
  • a mammography device is shown in the Siemens brochure "Mammomat”. This device has an X-ray tube, which is described in connection with DE-OS 3 136 806.
  • the device is also provided with a primary radiation diaphragm housing which can be pivoted into two end positions by means of articulated arms, the primary beam diaphragm being adapted to the current focus point in each end position. Because the primary radiation diaphragm housing describes an arcuate movement when moving from one end position to the other, it is displaced both laterally and in height. In this way, the primary beam aperture for the focal spot that is closest to the object table is also adjusted in height.
  • German patent application 4 32 32 2908 which has not yet been published, describes an X-ray tube with an anode plate on which four focal spots can be produced with the aid of the same number of cathodes.
  • the focal spot tracks of the anode plate are applied on a common plane inclined to the plate plane, so that all four focal spots that can be generated are cut by a common fictitious straight line that runs along the inclined plane.
  • a primary radiation shield which is used in conjunction with the mammography device described in the Siemens brochure "Mammomat" cannot be used in conjunction with the anode plate described in the German patent application which has not yet been published, since this primary radiation shield only has two end positions , which are adapted to a focal spot, can be brought.
  • the invention has for its object to provide an X-ray examination apparatus of the type mentioned with a primary radiation diaphragm, which can be moved in a very simple manner so that it is quickly brought into a position that the current focal spot of an anode plate with a number of such switchable focal spots is adapted.
  • This object is achieved according to the invention in that the primary beam diaphragm is shifted along the straight line when switching from one focal spot to the other.
  • the primary beam aperture can always be brought into an optimal position for the current focal spot, regardless of the number of focal spots. This ensures that the position and size of the recording field is always the same.
  • the primary beam diaphragm is attached to a holder which is arranged parallel to the straight line.
  • the primary beam diaphragm can thus be displaced along the straight line in a very simple manner.
  • the primary beam diaphragm be shifted with the aid of a motor, preferably a stepping motor. It is thereby achieved that the primary beam diaphragm can be brought into an optimal position for the current focal spot in a simple and uncomplicated manner when switching from one focal spot to another.
  • the primary beam aperture be shifted by a distance that corresponds to the distance between the focal spots between which the switchover takes place, multiplied by a factor that is selected in such a way that the size of the recording area is maintained .
  • the FIG shows, somewhat simplified, selected parts of a mammography device, namely an X-ray tube 1, a primary radiation diaphragm 2 and an object table 3, the distance between the X-ray tube 1 and the object table 3 not being shown to scale.
  • the x-ray tube 1 is of a type which is already shown and described in this application in the unpublished German publication 4,323,928.
  • the x-ray tube 1 comprises an anode plate 4 which can be rotated about its own axis 5.
  • the anode plate 4 is provided with two fuel sheet tracks 6 and 7, which are applied on a common plane inclined to the plate plane. With the help of cathodes 8 to 11, which are directed against the inclined plate plane, four focal points 12 to 15 can be generated at a distance from one another on the plate plane.
  • the x-ray tube 1 is provided with an opening 18 and a fixed coarse aperture 19, which serves to hold together the x-ray beam generated by one of the focal spots 12 to 15 and to direct it against the object table 3, in which an x-ray film sheet 20 is attached before an exposure .
  • the x-ray primary radiation diaphragm 2 which serves to dazzle the x-rays from the x-ray tube 1, ie from one of the focal spots 12, 13, 14 or 15, and these fine To set, here consists of a plate 21 made of an X-ray-opaque material with an approximately square opening 22.
  • the plate 21 is attached to a carriage 24 via a bracket 23.
  • the carriage 24 is in turn connected to a holder 26 via linear ball bearings 25 and can be displaced along the holder 26 by means of the ball bearing 25.
  • the bracket 26, which is fixedly connected to the tube 1 via a fastening 27, is angled in such a way that it runs parallel with the straight line 17.
  • a stepper motor 28 which controls a screw 29 such that it is displaced in its longitudinal direction, is also attached to the holder 26.
  • the free end of the screw 29 is connected to the carriage 24 via an elongated part 3.
  • the primary beam diaphragm 2 is further provided with a lamp 31 and a mirror 32, which are preferably attached to the bracket 23 or to the plate 21. The task of the lamp 31 and the mirror will be described later.
  • the breast 37 is then compressed in a known manner using a compression plate 33.
  • This exemplary embodiment is intended to show that the cathode 8 of the X-ray tube 1 generates a focal spot 12, which in turn directs an X-ray beam, which is suitable for this examination, against the object table 3.
  • the X-rays are delimited in such a way that they fall within a predetermined area on the object table 3.
  • the radiation field delimited by the aperture 22 is marked in the FIG with straight lines with the reference numerals 34 and 35.
  • the carriage 24 and thus the diaphragm plate 2 is displaced a distance along the holder 26 by means of the motor 28, the screw 29 and the part 30, which the Distance between the previously activated focal spot 12 and the focal spot 14 multiplied by corresponds to a factor which is selected such that the size of the receiving surface on the object table 3 is maintained.
  • the new position of the aperture plate 21 or the carriage 24 is shown with dash-dotted lines.
  • the aperture 22 is now, since the holder 26 is arranged in parallel with the straight line 17, displaced downward and laterally along the line 17, the displacement of the aperture plate 21 being somewhat shorter than the distance between the focal spots 12 and 14. In this way, as already described, the receiving surface on the stage 3 is retained.
  • the boundaries of the radiation field after switching to the focal spot 14 are denoted here by 34 and 36.
  • the aperture 22, as described is shifted along the straight line 17, the aperture 22 always being brought into a position that is appropriate for the focal spot that is switched on is optimal.
  • the stepper motor 28, which moves the carriage 24 for the diaphragm plate 21, so that the diaphragm plate 21 occupy these optimal positions when the desired focal spots are switched on, is controlled by means of a known and therefore not shown or described microprocessor with a control program provided for this purpose.
  • the diaphragm 2 can always be brought quickly and easily into an optimal position for the switched-on focal point.
  • the holder 26 for the diaphragm plate 21 can be replaced by a rail system, not shown here, with crossed rails which are mounted perpendicular to one another and are mutually displaceable. Even with such a structure the holder, which is preferably mounted perpendicular to the diaphragm plate 21, the diaphragm plate 21 can be made to be displaced along the straight line 17.
  • the lamp 31 and the mirror 32 mentioned in the description which, as already mentioned, are preferably attached to the primary beam diaphragm, serve to illuminate the recording field on the object table, which is then to be exposed by means of X-rays, before taking a picture.
  • the illuminated field makes it easier for the surgeon to place the x-ray object 37 in an optimal position on the object table 3.
  • the illuminated field is also an indication of the size and position of the exposure field.
  • the mirror 32 is then pushed aside in a known manner so that the beam path between the focal spot and the object is kept clear.

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Apparatus For Radiation Diagnosis (AREA)
  • X-Ray Techniques (AREA)
EP95105219A 1994-06-02 1995-04-06 Appareil de radiodiagnostic avec plusieurs foyers et un collimateur primaire déplaçable Expired - Lifetime EP0685200B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9401904 1994-06-02
SE9401904A SE9401904D0 (sv) 1994-06-02 1994-06-02 Röntgenundersökningsapparat

Publications (2)

Publication Number Publication Date
EP0685200A1 true EP0685200A1 (fr) 1995-12-06
EP0685200B1 EP0685200B1 (fr) 2002-08-28

Family

ID=20394217

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95105219A Expired - Lifetime EP0685200B1 (fr) 1994-06-02 1995-04-06 Appareil de radiodiagnostic avec plusieurs foyers et un collimateur primaire déplaçable

Country Status (6)

Country Link
US (1) US5544216A (fr)
EP (1) EP0685200B1 (fr)
JP (1) JP3764510B2 (fr)
DE (1) DE59510340D1 (fr)
FI (1) FI116193B (fr)
SE (1) SE9401904D0 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0794536A1 (fr) * 1996-03-07 1997-09-10 Philips Patentverwaltung GmbH Appareil d'examen à rayons X avec une source à rayons X en association avec une unité de diaphragme
WO2000013189A1 (fr) * 1998-08-28 2000-03-09 Elekta Ab (Publ) Collimateur pour appareil de radiotherapie
EP1623672A1 (fr) * 2004-08-04 2006-02-08 Siemens Aktiengesellschaft Appareil à rayons x, en particulier pour un dispositif de mammographie par rayons x

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7330529B2 (en) * 2004-04-06 2008-02-12 General Electric Company Stationary tomographic mammography system
JP5384612B2 (ja) * 2008-03-31 2014-01-08 コーニンクレッカ フィリップス エヌ ヴェ コーンビームボリュームｃｔマンモグラフィー撮像に使用するための、管が連続して移動している間、焦点を動かさない回転式のステップ・アンド・シュート画像取得に基づく、高速トモシンセシススキャナ装置及びｃｔベースの方法
CN115046505B (zh) * 2022-07-29 2024-08-02 重庆大学 一种高能电子直线加速器x射线焦斑测量装置及方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2329068A1 (fr) * 1975-10-24 1977-05-20 Radiologie Cie Gle Tube radiogene a anode tournante avec foyer apparent de forme allongee
EP0074596A1 (fr) * 1981-09-16 1983-03-23 Siemens Aktiengesellschaft Appareil d'examen à rayons X
EP0093297A1 (fr) * 1982-04-30 1983-11-09 Siemens Aktiengesellschaft Appareil d'examen aux rayons-X
EP0485742A1 (fr) * 1990-11-14 1992-05-20 Siemens-Elema AB Diaphragme pour le rayonnement X primaire
US5224145A (en) * 1990-03-28 1993-06-29 Kabushiki Kaisha Toshiba X-ray beam limiting apparatus including pivotable blade
DE4410760A1 (de) * 1993-07-12 1995-01-19 Siemens Ag Röntgenröhre mit einer Anode und Mitteln zur Brennfleckverlagerung

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE793417A (fr) * 1972-01-05 1973-04-16 Siemens Ag Appareil de radiographie
EP0142841A3 (fr) * 1983-11-18 1987-04-29 Kabushiki Kaisha Toshiba Dispositif limiteur de faisceau pour un appareil de radiodiagnostic
EP0166030B1 (fr) * 1984-06-15 1988-08-03 Siemens Aktiengesellschaft Diaphragme pour le rayonnement X primaire d'un appareil de radiodiagnostic pour prises de vue stéréoradiographiques
DE4207006C2 (de) * 1992-03-05 1994-07-14 Siemens Ag Computertomograph
US5308250A (en) * 1992-10-30 1994-05-03 Hewlett-Packard Company Pressure contact for connecting a coaxial shield to a microstrip ground plane
US5511105A (en) * 1993-07-12 1996-04-23 Siemens Aktiengesellschaft X-ray tube with multiple differently sized focal spots and method for operating same

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2329068A1 (fr) * 1975-10-24 1977-05-20 Radiologie Cie Gle Tube radiogene a anode tournante avec foyer apparent de forme allongee
EP0074596A1 (fr) * 1981-09-16 1983-03-23 Siemens Aktiengesellschaft Appareil d'examen à rayons X
EP0093297A1 (fr) * 1982-04-30 1983-11-09 Siemens Aktiengesellschaft Appareil d'examen aux rayons-X
US5224145A (en) * 1990-03-28 1993-06-29 Kabushiki Kaisha Toshiba X-ray beam limiting apparatus including pivotable blade
EP0485742A1 (fr) * 1990-11-14 1992-05-20 Siemens-Elema AB Diaphragme pour le rayonnement X primaire
DE4410760A1 (de) * 1993-07-12 1995-01-19 Siemens Ag Röntgenröhre mit einer Anode und Mitteln zur Brennfleckverlagerung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Derwent World Patents Index; *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0794536A1 (fr) * 1996-03-07 1997-09-10 Philips Patentverwaltung GmbH Appareil d'examen à rayons X avec une source à rayons X en association avec une unité de diaphragme
US5844962A (en) * 1996-03-07 1998-12-01 U.S. Philips Corporation X-ray examination apparatus with an X-ray source and a diaphragm unit connected thereto
WO2000013189A1 (fr) * 1998-08-28 2000-03-09 Elekta Ab (Publ) Collimateur pour appareil de radiotherapie
US6714627B1 (en) 1998-08-28 2004-03-30 Elekta Ab Collimator for radiotherapy apparatus
EP1623672A1 (fr) * 2004-08-04 2006-02-08 Siemens Aktiengesellschaft Appareil à rayons x, en particulier pour un dispositif de mammographie par rayons x

Also Published As

Publication number Publication date
SE9401904D0 (sv) 1994-06-02
DE59510340D1 (de) 2002-10-02
FI952725A0 (fi) 1995-06-02
FI116193B (fi) 2005-10-14
FI952725A (fi) 1995-12-03
US5544216A (en) 1996-08-06
JP3764510B2 (ja) 2006-04-12
EP0685200B1 (fr) 2002-08-28
JPH07327966A (ja) 1995-12-19

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