EP0685200B1 - Röntgenuntersuchungsgerät mit mehreren Brennflecken und verschiebarer Primärstrahlenblende - Google Patents

Röntgenuntersuchungsgerät mit mehreren Brennflecken und verschiebarer Primärstrahlenblende Download PDF

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Publication number
EP0685200B1
EP0685200B1 EP95105219A EP95105219A EP0685200B1 EP 0685200 B1 EP0685200 B1 EP 0685200B1 EP 95105219 A EP95105219 A EP 95105219A EP 95105219 A EP95105219 A EP 95105219A EP 0685200 B1 EP0685200 B1 EP 0685200B1
Authority
EP
European Patent Office
Prior art keywords
primary beam
focal spot
focal
straight line
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.)
Expired - Lifetime
Application number
EP95105219A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0685200A1 (de
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/de
Application granted granted Critical
Publication of EP0685200B1 publication Critical patent/EP0685200B1/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
    • 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 an x-ray tube comprising an anode plate with a plane inclined to the plate level and optionally switchable Focal spots that can be applied to the inclined plane at a distance from one another are all of a common fictional straight line that runs along the inclined plane and with a primary diaphragm that shifted from one focal spot to another by shifting means becomes.
  • Such an X-ray examination device is in DE-OS 3 136 806.
  • the anode plate in the x-ray tube the is rotatable about its own axis, is different with two Provide focal spot tracks inclined to the plate level.
  • the X-ray tube also includes two cathodes, in the each cathode is directed to a focal spot track. With the help of the cathodes, each focal spot path is generates a focal spot, the focal spot of one web e.g. is larger than that of the other lane. This can the operator the cathode or focal spot, he or she during an examination, e.g. at a Turn on the mammography exam that feels most appropriate.
  • the focal spots with a certain distance are attached from each other, when switching from on the one hand the focal spot and the primary beam aperture be shifted so that the x-ray cone is directed towards the stage, i.e. exactly X-ray film sheet placed in or under the stage is pushed in, covers.
  • DE-OS is the primary aperture Primary radiation shield housing only laterally up to two end positions displaceable, the primary diaphragm in the an end position in relation to the one focal spot and in the other end position in relation to the other focal spot is.
  • this X-ray examination device is not been taken into account that the focal spots mentioned except at a lateral distance from each other on the anode plate also at a distance from each other, i.e. With different distances from the primary aperture Object table, are offset.
  • closest to the primary diaphragm can there is therefore an undesirable spread of the x-ray field lead outside the reception area.
  • the device has an X-ray tube in connection is described with DE-OS 3 136 806 on.
  • the device is also provided with a primary radiation shield housing, that can be swiveled in two end positions by means of articulated arms is, the primary diaphragm in each end position on the current focus point is adjusted. Because the primary radiation shield housing with a shift from the describes an arcuate movement to the other end position, it is moved both laterally and vertically. In this way, the primary aperture for the focal spot closest to the stage, too adjusted in height.
  • DE-A-4 410 757 describes an X-ray tube with one Anode plate on which four focal spots with the help of the same many cathodes can be generated.
  • the Focal spot tracks of the anode plate are on a common one applied to the plane inclined plane so that all four focal spots that can be generated from a common one fictional straight line that runs along the inclined Plane runs to be cut.
  • a primary diaphragm which in conjunction with that in the Siemens prospectus "Mammomat" described mammography device is used cannot be used in conjunction with the anode plate in the aforementioned German patent application not yet published is used, as this primary beam diaphragm only in two end positions, each on a focal spot are adjusted, can be brought.
  • the invention has for its object an X-ray examination device of the type mentioned at the outset with a primary diaphragm to create that in a very simple way can be moved in such a way that it can quickly be in one position brought to the current focal spot of an anode plate with a number of such switchable focal spots is adjusted.
  • This object is achieved in that the Primary beam aperture through the shifting means parallel to the fictitious straight line is moved. As a result, the primary beam aperture, regardless of the number of focal spots, always in one for the current focal spot is brought to the optimal location. On this ensures that the location and size of the Field is always the same.
  • the primary beam aperture on a bracket which is arranged parallel to the fictitious straight line is.
  • a Shift the primary beam aperture along the straight line Line is proposed.
  • the shift of the primary beam aperture with the help of an engine, preferably one Stepper motor is done. This ensures that the primary aperture when switching from one focal spot to another in a simple and straightforward manner brought into an optimal position for the current focal spot can be.
  • the primary diaphragm be reduced by one Distance is shifted, the distance between the focal spots, between which the switching takes place, multiplied with a factor chosen in such a way that the size of the receiving area is maintained.
  • the invention is based on one in the drawing illustrated embodiment explained in more detail.
  • the FIG shows, somewhat simplified, selected parts of a Mammography device, namely an X-ray tube 1, a primary radiation diaphragm 2 and a stage 3, the distance between the X-ray tube 1 and the stage 3 is not shown to scale.
  • the X-ray tube 1 is of such a type, which is already described in this application the German that has not yet been published Document 4,323,928 is shown and described.
  • the x-ray tube 1 comprises an anode plate 4 which is about its own axis 5 is rotatable.
  • the anode plate 4 is with two Focal spot tracks 6 and 7 provided on a common plane inclined to the plane of the plate.
  • the x-ray tube 1 has an opening 18 and a fixed coarse aperture 19, which is used by the one of the focal spots 12 to 15 generated X-ray beams hold together and this against the stage 3, in which an X-ray film sheet 20 is attached before an exposure is to judge.
  • the X-ray primary radiation shield 2 which serves the X-rays from the X-ray tube 1, i.e. from one of the Focal spots 12, 13, 14 or 15 dimmer and these fine to set, consists here of a plate 21 from a radiopaque material with an approximately square Opening 22.
  • the plate 21 is via a bracket 23 attached to a carriage 24.
  • the car 24 is in turn connected to a bracket 26 via linear ball bearings 25 and by means of the ball bearing 25 along the bracket 26 displaceable.
  • the bracket 26, which has a fastening 27 is firmly connected to the tube 1, is angled in this way attached that it runs parallel with the straight line 17.
  • On the bracket 26 is also a stepper motor 28, the controls a screw 29 such that it extends in its longitudinal direction is moved, attached.
  • the free end of the Screw 29 is an elongated part 30 with the Car 24 connected.
  • the primary beam diaphragm 2 is also with a lamp 31 and a mirror 32, which are preferably on the bracket 23 or attached to the plate 21, provided. The task of the lamp 31 and the mirror will be later described in more detail.
  • the doctor goes through now Influencing the cathode 10 instead selects the focal spot To produce 14, the car 24 and thus the Aperture plate 2 using the motor 28, the screw 29 and the part 30 along the bracket 26 a distance shifted the distance between the previously turned on Focal spot 12 and focal spot 14 multiplied by corresponds to a factor chosen such that the Size of the receiving surface on the stage 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 by the bracket 26 with the straight line 17th is arranged in parallel along line 17 i.e. to shifted below and laterally, the shift of the Aperture plate 21 somewhat shorter than the distance between the Focal spots 12 and 14 is. That way, how already described, the receiving surface on the stage 3 maintained.
  • the boundaries of the radiation field after Switching to focal spot 14 are here with 34 and 36 designated.
  • the aperture 22 When switching from the focal spot 14 to one further desired focal spot 12, 13 or 15, the aperture 22, as described, along the straight line 17 shifted, the aperture 22 always is brought into a position for the switched on Focal spot is optimal.
  • the stepper motor 28 that the car 24 for the diaphragm plate 21 moves, so that the diaphragm plate 21 when switching on the desired focal spots occupy these optimal locations is known by means of a and therefore not shown or described in detail Microprocessor with one intended for this purpose Control program controlled.
  • the bracket 26 for the diaphragm plate 21 can by a here not shown rail system with perpendicular to each other attached crossed rails that are mutually slidable are to be replaced. Even with such a structure the bracket, which is preferably perpendicular to the aperture plate 21 is attached, the diaphragm plate 21 can be brought to it are shifted to along the straight line 17 become.
  • the lamp 31 mentioned in the description and the mirror 32 which, as already mentioned, preferably on the primary beam diaphragm are attached to serve before a shot the recording field on the object table, which is then by means of X-rays should be illuminated to illuminate.
  • the illuminated field makes it easier for the surgeon to X-ray object 37 in an optimal position on the stage 3 place.
  • the illuminated field is also a display of the Size and location of the recording field.
  • the mirror 32 turns on afterwards pushed aside in a known manner so that the Keep the beam path between the focal spot and the object clear becomes.

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 Röntgenuntersuchungsgerät mit mehreren Brennflecken und verschiebarer Primärstrahlenblende Expired - Lifetime EP0685200B1 (de)

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 EP0685200A1 (de) 1995-12-06
EP0685200B1 true EP0685200B1 (de) 2002-08-28

Family

ID=20394217

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95105219A Expired - Lifetime EP0685200B1 (de) 1994-06-02 1995-04-06 Röntgenuntersuchungsgerät mit mehreren Brennflecken und verschiebarer Primärstrahlenblende

Country Status (6)

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

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19608862A1 (de) * 1996-03-07 1997-09-11 Philips Patentverwaltung Röntgenuntersuchungsgerät mit einem Röntgenstrahler und einer damit verbundenen Blendeneinheit
GB2341301B (en) 1998-08-28 2003-04-09 Elekta Ab Collimator for radiotherapy apparatus
US7330529B2 (en) * 2004-04-06 2008-02-12 General Electric Company Stationary tomographic mammography system
EP1623672A1 (de) * 2004-08-04 2006-02-08 Siemens Aktiengesellschaft Röntgenvorrichtung, insbesondere für ein Mammographie-Röntgengerät
WO2009122328A1 (en) * 2008-03-31 2009-10-08 Koninklijke Philips Electronics N. V. Fast tomosynthesis scanner apparatus and ct-based method based on rotational step-and-shoot image acquisition without focal spot motion during continuous tube movement for use in cone-beam volume ct mammography imaging

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3136806A1 (de) * 1981-09-16 1983-03-31 Siemens AG, 1000 Berlin und 8000 München Roentgenuntersuchungsgeraet
DE4323928A1 (de) * 1992-10-30 1994-05-11 Hewlett Packard Co Druckkontakt zum Verbinden einer koaxialen Abschirmung mit einer Mikrostreifenleitermasseebene
DE4410757A1 (de) * 1993-07-12 1995-01-19 Siemens Ag Röntgenröhre mit einer Anode

Family Cites Families (9)

* 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
FR2329068A1 (fr) * 1975-10-24 1977-05-20 Radiologie Cie Gle Tube radiogene a anode tournante avec foyer apparent de forme allongee
DE3216216A1 (de) * 1982-04-30 1983-11-10 Siemens AG, 1000 Berlin und 8000 München Roentgenuntersuchungsgeraet
EP0142841A3 (en) * 1983-11-18 1987-04-29 Kabushiki Kaisha Toshiba Aperture device of radiation diagnostic apparatus
EP0166030B1 (de) * 1984-06-15 1988-08-03 Siemens Aktiengesellschaft Primärstrahlenblende für eine Röntgendiagnostikanlage für Röntgen-Stereobilder
US5224145A (en) * 1990-03-28 1993-06-29 Kabushiki Kaisha Toshiba X-ray beam limiting apparatus including pivotable blade
SE9003638D0 (sv) * 1990-11-14 1990-11-14 Siemens Elema Ab Primaerstraaleblaendare foer ett roentgenroer
DE4207006C2 (de) * 1992-03-05 1994-07-14 Siemens Ag Computertomograph
DE4410760A1 (de) * 1993-07-12 1995-01-19 Siemens Ag Röntgenröhre mit einer Anode und Mitteln zur Brennfleckverlagerung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3136806A1 (de) * 1981-09-16 1983-03-31 Siemens AG, 1000 Berlin und 8000 München Roentgenuntersuchungsgeraet
DE4323928A1 (de) * 1992-10-30 1994-05-11 Hewlett Packard Co Druckkontakt zum Verbinden einer koaxialen Abschirmung mit einer Mikrostreifenleitermasseebene
DE4410757A1 (de) * 1993-07-12 1995-01-19 Siemens Ag Röntgenröhre mit einer Anode

Also Published As

Publication number Publication date
JPH07327966A (ja) 1995-12-19
EP0685200A1 (de) 1995-12-06
DE59510340D1 (de) 2002-10-02
JP3764510B2 (ja) 2006-04-12
FI116193B (fi) 2005-10-14
US5544216A (en) 1996-08-06
FI952725A (fi) 1995-12-03
SE9401904D0 (sv) 1994-06-02
FI952725A0 (fi) 1995-06-02

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