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EP0810815B1 - Appareil de radiographie - Google Patents

Appareil de radiographie Download PDF

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Publication number
EP0810815B1
EP0810815B1 EP97201553A EP97201553A EP0810815B1 EP 0810815 B1 EP0810815 B1 EP 0810815B1 EP 97201553 A EP97201553 A EP 97201553A EP 97201553 A EP97201553 A EP 97201553A EP 0810815 B1 EP0810815 B1 EP 0810815B1
Authority
EP
European Patent Office
Prior art keywords
ray
tube
heating
transformer
ray device
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
EP97201553A
Other languages
German (de)
English (en)
Other versions
EP0810815A1 (fr
Inventor
Hans Negle
Martin Wimmer
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.)
Philips Intellectual Property and Standards GmbH
Koninklijke Philips NV
Original Assignee
Philips Intellectual Property and Standards GmbH
Koninklijke Philips Electronics NV
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 Philips Intellectual Property and Standards GmbH, Koninklijke Philips Electronics NV filed Critical Philips Intellectual Property and Standards GmbH
Publication of EP0810815A1 publication Critical patent/EP0810815A1/fr
Application granted granted Critical
Publication of EP0810815B1 publication Critical patent/EP0810815B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H05G1/10—Power supply arrangements for feeding the X-ray tube
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05G—X-RAY TECHNIQUE
    • H05G1/00—X-ray apparatus involving X-ray tubes; Circuits therefor
    • H05G1/02—Constructional details
    • H05G1/04—Mounting the X-ray tube within a closed housing
    • H05G1/06—X-ray tube and at least part of the power supply apparatus being mounted within the same housing

Definitions

  • the invention relates to an X-ray device with an X-ray source with a arranged in a tube protective housing X-ray tube and with a to the Cathode of the X-ray tube connected, arranged in the tube protective housing Filament converter.
  • Such an X-ray device is known from DE-A 42 01 616.
  • the Schuwandler is there, for example, in the form of a feedthrough current transformer realized, which has a ferrite core.
  • a designed as a heating transformer Schuwandler with a ferrite core requires In general, relatively much space, so that the installation of such Thompsonwandlers in the tube protective housing of an X-ray source at conventional X-ray tubes is not possible without constructive Changes to the X-ray source are made.
  • the invention is therefore based on the object to specify measures by the integration of the Schuwandlers in the tube protective housing at different conventional X-ray equipment is possible without thereby larger constructive changes to the X-ray device are required.
  • the Schuwandler a Heating transformer without transformer core comprises that the primary coil of the Heating transformer is arranged coaxially to the secondary coil of the heating transformer and that the coils enclose a carrier.
  • the Tube neck of the X-ray tube or a high-voltage connector socket over which the X-ray tube from a high voltage generator fed a high voltage is the carrier, and that the primary coil coaxially surrounds the secondary coil.
  • Both the tube neck and the high voltage socket are in designed generally rotationally symmetrical and are particularly suitable as a carrier for the coils. Since the secondary coil, which supplies the heating current of the cathode, at the same time lying on the high voltage potential of the cathode encloses the Secondary coil advantageously directly to the tube neck or the High voltage terminal, while the lying at low voltage potential Primary coil for isolation reasons at a distance or by a Isolation body separately surrounds the secondary coil coaxially. This arrangement is particularly space-saving and can be with conventional X-ray tubes apply.
  • the X-ray device two as heating transformers without transformer core has configured Schuwandler and that the primary coils and secondary coils Both heating transformers enclose a common carrier.
  • a X-ray tube often has two cathode elements for setting a large and a small focus.
  • the coils of a common carrier advantageously the tube neck or the high-voltage connection socket, enclose.
  • the X-ray device Having means for compensation of tube noise.
  • a damped high voltage cable to supply the High voltage from a high voltage generator to the cathode of X-ray tube.
  • damped high voltage cables are from the beginning DE-A 42 01 616 known, are in conventional X-ray devices but only by the integration of the Schuwandlers in the X-ray source usable.
  • a damped high voltage cable which is also used to supply the High voltage to the anode of the x-ray tube is used, a through a rollover in the X-ray tube caused traveling wave strongly attenuated become. This leads to a significant improvement in the electromagnetic Compatibility with tube disorders and reduces the risk of damage the X-ray tube or the high voltage generator.
  • the X-ray device a compensation circuit for reducing Has stray field losses of the heating transformer.
  • a transformer without Transformer core for example ferrite or iron core
  • To operate a significant reactive power is to operate are for operation significantly larger voltages and / or currents required. These losses can However, be significantly reduced by a suitable compensation circuit.
  • the X-ray device shown in Fig. 1 comprises an X-ray source with an in a tube protective housing 1 arranged X-ray tube 2.
  • a cathode block 3 and a rotary anode 4 conventional design To achieve two different focus sizes are located in Cathode block 3 two cathode elements not shown here, in the shown Example be fed via two separate Schuwandler.
  • the heating currents are the cathode elements via lines 61, 62 from the first Schuwandler or Lines 71, 72 supplied from the second heating converter.
  • the lines 61, 62, 71, 72 are guided at the tube neck 5 in the X-ray tube 2.
  • High voltage supply line 8 through which the cathode elements opposite Mass negative high voltage of -75 kV is supplied.
  • another High voltage supply line 9 At the tube neck 5 opposite end of the x-ray tube 2 is another High voltage supply line 9, through which the anode 4 a positive with respect to ground High voltage of +75 kV is supplied.
  • the tube protective housing 1 two High voltage connection sockets 10 and 11. In these high voltage connection sockets 10, 11 are the high voltage inputs 12, 13, the high voltage cables, the high voltage generated by a high voltage generator, not shown of ⁇ 75 kV to the X-ray source, connected.
  • Both Thompsonwandler are as similar heating transformers without Transformer core, i. without ferrite or iron core, designed and made each of a primary coil 14 and 16 and a secondary coil 15 and 17.
  • Die Primary coil 14 of the first heating transformer is coaxial with the secondary coil 15 of the first heating transformer arranged.
  • the secondary coil 15 is around as Carrier acting high voltage terminal socket 10 is arranged.
  • the primary coil 16 of the second heating transformer coaxially around the Secondary coil 17 arranged and this umum to the High-voltage connection socket 10.
  • the primary coil 14 is connected via leads 18, 19 fed, the primary coil 16 via leads 20, 21.
  • the heating converter has a ferrite core. Due to its size, such a converter could be used with transformer an X-ray device of the type shown here without changes in Geometry of the X-ray tube and / or the tube protection housing within the Tubular protective housing can be used.
  • the Schuwandlers without ferrite or iron core, this is possible.
  • the Invention uses the rotationally symmetrical design of the High voltage terminal 10 from which the coils 14 to 17 of Schuwandler arranged in a simple and space-saving manner coaxial, for example, can be plugged.
  • FIG. 1 Another embodiment is shown in FIG. There are the primary coils 14, 16 and the secondary coils 15, 17 around the tube neck 5 of the X-ray tube 2 arranged, which serves as a carrier here. Also in this embodiment is no Changing the geometry of the X-ray tube 2 or the tube protective housing 1 necessary to the Schuwandler in the manner shown in the tube protective housing. 1 to be able to order.
  • the high-voltage terminal 10 with the arranged according to FIG Schufflemin is shown in Fig. 3 enlarged.
  • the secondary coil bodies 152, 172 are designed so that between the secondary windings 151, 171 of the Secondary coils 15, 17 and the primary windings 141, 161 of the primary coils 14, 16 an air gap of at least a few millimeters, e.g. 6 mm exists.
  • the Schuwandler In known X-ray devices, the Schuwandler is usually outside the Tubular protective housing together with a high voltage transformer, which the High voltage generated for the x-ray tube, in a high voltage generator arranged. The heating current is doing together with the high voltage for the Cathode via a common cable supplied to the X-ray source.
  • the Invention according to which the Schuwandler is designed so that it X-ray tubes of various sizes and configurations can be arranged is also the use of known from DE-A 42 01 616, steamed High-voltage cables in a variety of X-ray sources possible because at one In the X-ray source integrated Garwandler only the high voltage for the Cathode must be supplied to the X-ray source from the high voltage generator.
  • Damped high voltage cables in particular have the advantage that Traveling waves from the X-ray tube to the high voltage generator, by a Tubular disturbance can be caused to be strongly attenuated, causing the Durability of the tube is increased. In addition, this can also be a Self-healing of the anode can be achieved in a Dekonditiontechnik.
  • the tube current of an X-ray source via the primary current of Heating transformer is regulated and the secondary current of Heating transformer via the current transformation ratio of the heating transformer sets strict requirements for linearity and temporal constancy the translation ratio.
  • the current conversion ratio is a compensation circuit intended.
  • To the load impedance of the heating transformer wear the cathode element as well as the lines (resistive and capacitive).
  • the Compensation circuit also operating frequency variations and losses through Stray field couplings into nearby metal parts and further stray field losses of the Heating transformer largely compensated.
  • the compensation circuit has a primary-side series and a secondary-side parallel compensation.
  • the capacitance C 1 represents the capacitance of the resonant compensation circuit, the resistor R 1 essentially the winding resistance of the primary coil L 14th
  • On the secondary side in series with the secondary winding L 15 , which corresponds to the secondary coil 15 in FIG. 3, a resistor R 2 and a parallel circuit of a capacitor C 2 and the load resistor R L are connected.
  • the resistance R 2 is substantially the winding resistance of the secondary coil L 15
  • the capacitance C 2 is substantially the resonance capacity of the compensation circuit, increased by the winding capacity and between the lines of the secondary coil L 15 to the cathode element existing capacity.
  • the compensation circuit shown in FIG. 4 represents a particularly advantageous solution, since the current load and thus also the price of a compensation capacitor possibly required for setting a specific capacitance value are kept low by the primary-side series compensation.
  • the values of the resistors R 1 , R 2 and the capacitances C 1 , C 2 should be selected so that the current transmission ratio is largely independent of the load resistance R L and that as little reactive power as possible must be used.
  • the transformer is suitably dimensioned according to known methods and the capacitance values are suitably selected.
  • the Bankwandler includes only a primary coil 14 and a secondary coil 15, which have approximately an equal diameter and around the high voltage terminal 10 at superimposed locations are arranged.
  • the lying at high voltage potential secondary winding of Secondary coil 15 is surrounded on three sides by an insulating body 50, the mainly for the isolation of the primary coil 14 from the secondary coil 15, but also serves as a bobbin for the secondary coil 15.

Landscapes

  • X-Ray Techniques (AREA)

Claims (5)

  1. Appareil de radiographie avec un générateur de rayons X doté d'un tube à rayons X (2) disposé dans un boítier de protection du tube (1) et d'un convertisseur de chaleur disposé dans le boítier de protection du tube (1) et raccordé à la cathode (3) des tubes à rayons X.
    caractérisé en ce que le convertisseur de chaleur comprend un transformateur de chaleur (14, 15, 16, 17) sans noyau de transformateur, que la bobine primaire (14, 16) du transformateur de chaleur est disposée coaxialement par rapport à la bobine secondaire (15, 17) du transformateur de chaleur et que les bobines (14, 15, 16, 17) comprennent un support (5, 10).
  2. Appareil de radiographie selon la revendication 1,
    caractérisé en ce que le col de tube (5) du tube à rayons X (2) ou une douille de raccordement à haute tension (10) par l'intermédiaire desquels une haute tension est amenée aux tubes à rayons X (2) par un générateur à haute tension, qui est un support et que la bobine primaire (14,16) renferme coaxialement la bobine secondaire (15, 17).
  3. Appareil de radiographie selon l'une des revendications 1 ou 2,
    caractérisé en ce que l'appareil de radiographie présente deux convertisseurs de chauffage conçus comme des transformateurs de chaleur sans noyau de transformateur et que les bobines primaires (14, 16) et les bobines secondaires (15, 17) des deux transformateurs de chaleur renferment un support commun (5, 10).
  4. Appareil de radiographie selon l'une des revendications précédentes, caractérisé en ce que l'appareil radiographique présente des moyens pour la compensation des perturbations des tubes.
  5. Appareil radiographique selon l'une des revendications précédentes,
    caractérisé en ce que l'appareil radiographique présente un circuit de compensation en réduction de pertes du champ de dispersion du transformateur de chaleur.
EP97201553A 1996-05-29 1997-05-23 Appareil de radiographie Expired - Lifetime EP0810815B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19621528 1996-05-29
DE19621528A DE19621528A1 (de) 1996-05-29 1996-05-29 Röntgeneinrichtung

Publications (2)

Publication Number Publication Date
EP0810815A1 EP0810815A1 (fr) 1997-12-03
EP0810815B1 true EP0810815B1 (fr) 2005-03-16

Family

ID=7795580

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97201553A Expired - Lifetime EP0810815B1 (fr) 1996-05-29 1997-05-23 Appareil de radiographie

Country Status (4)

Country Link
US (1) US5878109A (fr)
EP (1) EP0810815B1 (fr)
JP (1) JP3989591B2 (fr)
DE (2) DE19621528A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10005629A1 (de) * 2000-02-09 2001-08-23 Siemens Ag Röntgenstrahler
US7327829B2 (en) * 2004-04-20 2008-02-05 Varian Medical Systems Technologies, Inc. Cathode assembly
DE102014201514B4 (de) * 2014-01-28 2021-09-16 Siemens Healthcare Gmbh Röntgenstrahler
CN106486257B (zh) 2014-06-23 2018-05-04 上海联影医疗科技有限公司 高压发生器
DE102015213810B4 (de) 2015-07-22 2021-11-25 Siemens Healthcare Gmbh Hochspannungszuführung für einen Röntgenstrahler
JP2019050123A (ja) * 2017-09-11 2019-03-28 株式会社島津製作所 Ｘ線発生装置、ｘ線透視像撮影装置およびｃｔ像撮影装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55157900A (en) * 1979-05-26 1980-12-08 Asahi Roentgen Kogyo Kk Portable x-ray generator
US4317040A (en) * 1980-07-14 1982-02-23 Pennwalt Corporation Low ripple regulated X-ray tube power supply filament transformer
JP2539193B2 (ja) * 1984-12-20 1996-10-02 バリアン・アソシエイツ・インコーポレイテッド 高強度ｘ線源
FR2579401B1 (fr) * 1985-03-22 1987-05-15 Thomson Cgr Ensemble generateur haute tension et dispositif radiogene
US4878235A (en) * 1988-02-25 1989-10-31 Varian Associates, Inc. High intensity x-ray source using bellows
DE4201616A1 (de) * 1992-01-22 1993-07-29 Philips Patentverwaltung Roentgeneinrichtung

Also Published As

Publication number Publication date
DE19621528A1 (de) 1997-12-04
JP3989591B2 (ja) 2007-10-10
EP0810815A1 (fr) 1997-12-03
JPH1055898A (ja) 1998-02-24
DE59712226D1 (de) 2005-04-21
US5878109A (en) 1999-03-02

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