EP0279317A1 - Röntgendiagnostikeinrichtung - Google Patents

Röntgendiagnostikeinrichtung Download PDF

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Publication number
EP0279317A1
EP0279317A1 EP88101815A EP88101815A EP0279317A1 EP 0279317 A1 EP0279317 A1 EP 0279317A1 EP 88101815 A EP88101815 A EP 88101815A EP 88101815 A EP88101815 A EP 88101815A EP 0279317 A1 EP0279317 A1 EP 0279317A1
Authority
EP
European Patent Office
Prior art keywords
ray tube
ray
circuit
thyristors
voltage
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.)
Withdrawn
Application number
EP88101815A
Other languages
German (de)
English (en)
French (fr)
Inventor
Jürgen Dipl.-Ing. Ussmüller (FH)
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
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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, Siemens Corp filed Critical Siemens AG
Publication of EP0279317A1 publication Critical patent/EP0279317A1/de
Withdrawn legal-status Critical Current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
    • H05G1/26—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
    • 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
    • H05G1/56—Switching-on; Switching-off

Definitions

  • the invention relates to an X-ray diagnostic device with an X-ray tube, a high-voltage generator and a switching device for switching the X-ray tube on and off.
  • the high-voltage generator of an X-ray diagnostic device generally consists of a high-voltage transformer with a rectifier and smoothing element downstream to reduce the high-voltage ripple.
  • a high-voltage cable which has a capacitance to earth, is used to couple the X-ray tube to the high-voltage generator.
  • the parallel connection of smoothing and cable capacitance must be charged. After the recording, the charge in this capacity is discharged via the X-ray tube by means of the current flowing in the X-ray tube.
  • the proportion of the effective patient dose which arises from the discharge of the capacity can be as large or larger than the proportion of the desired imaging dose. Accordingly, the patient is exposed to radiation that does not contribute to image generation.
  • the invention has for its object to provide an X-ray diagnostic device of the type mentioned in such a way that non-imaging, but patient exposure to radiation after switching off the high voltage is avoided by discharging the cable and smoothing capacity via the X-ray tube.
  • a thyristor circuit is connected in parallel to the X-ray tube, to which a control circuit for discharging the high-voltage side capacities is assigned after the end of an X-ray exposure and which is in series with an erase circuit for erase after unloading.
  • the thyristor circuit prevents or at least reduces the discharge current of the capacitors on the high-voltage side via the X-ray tube.
  • a high-voltage transformer 1 which feeds an X-ray tube 2 via a high-voltage rectifier 3.
  • a smoothing capacitance 4 lies parallel to the X-ray tube 2.
  • the high-voltage cables leading to the X-ray tube 2 have capacitances with respect to earth, which are denoted by 5.
  • the thyristors 7 are optically ignited by a control circuit 10 with the aid of optocouplers 11.
  • the thyristors 7 are ignited with the aid of the control circuit 10.
  • the high-voltage capacitors 4, 5 are discharged without the X-ray tube 2 being subjected to a significant discharge current.
  • the resistance value of the resistor 8 is to be dimensioned such that the discharge current is significantly higher than the X-ray tube current, e.g. is 10 to 100 times the X-ray tube current.
  • the erase circuit 9 has the effect that the thyristors 7 are securely locked again before the start of a new recording.
  • FIG. 2 shows the time profile of the x-ray tube voltage and FIG. 3 shows that of the x-ray tube current without the discharge circuit 6. It can be clearly seen that after completion of a recording at time t1, a relatively slowly decreasing discharge current due to discharge of the capacitors 4, 5 on the high-voltage side flows over the X-ray tube 2.
  • FIG. 4 shows the course of the X-ray tube voltage
  • FIG. 5 shows the course of the X-ray tube current with the discharge circuit 6. A significantly faster drop in the X-ray tube voltage and the X-ray tube current can be seen.
  • Fig. 6 shows the course of the discharge current in the discharge circuit 6, e.g. through the resistor 8.
  • FIG. 1 shows a switch S which is intended to represent schematically the switching device for switching the X-ray tube 2 on and off for the production of X-ray images. Furthermore, optical waveguides 12 are shown, which connect the optocouplers 11 to the thyristors 7.

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • X-Ray Techniques (AREA)
  • Electronic Switches (AREA)
EP88101815A 1987-02-20 1988-02-08 Röntgendiagnostikeinrichtung Withdrawn EP0279317A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3705545 1987-02-20
DE3705545 1987-02-20

Publications (1)

Publication Number Publication Date
EP0279317A1 true EP0279317A1 (de) 1988-08-24

Family

ID=6321451

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88101815A Withdrawn EP0279317A1 (de) 1987-02-20 1988-02-08 Röntgendiagnostikeinrichtung

Country Status (2)

Country Link
EP (1) EP0279317A1 (enrdf_load_stackoverflow)
JP (1) JPS63137500U (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5241260A (en) * 1989-12-07 1993-08-31 Electromed International High voltage power supply and regulator circuit for an X-ray tube with transient voltage protection
WO2003103346A1 (en) * 2002-05-31 2003-12-11 Philips Intellectual Property & Standards Gmbh X-ray tube
WO2010109027A1 (es) * 2009-03-25 2010-09-30 Sociedad Española De Electromedicina Y Calidad, S.A. Modulo de descarga para cables de alta tensión de tubo de rayos-x

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE728426C (de) * 1940-12-28 1942-11-26 Siemens Reiniger Werke Ag Einrichtung zum Entladen des Kondensators eines Kondensatorroentgenapparates beim Zurueckregulieren der Aufnahmespannung
DE1078244B (de) * 1958-04-18 1960-03-24 Siemens Reiniger Werke Ag Roentgendiagnostikapparat mit Initialbelastung
DE1119417B (de) * 1960-08-17 1961-12-14 Siemens Reiniger Werke Ag Schaltungsanordnung zum Loeschen von in Gleichstromkreise eingeschalteten Gas- oder Dampfentladungsstrecken, insbesondere zur Kurzzeitschaltung von Roentgenroehren
DE1167457B (de) * 1963-01-10 1964-04-09 Siemens Reiniger Werke Ag Roentgendiagnostikapparat mit einem im Hochspannungskreis angeordneten steuerbaren-Ventil
JPS55151794A (en) * 1979-05-17 1980-11-26 Toshiba Corp X-ray apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE728426C (de) * 1940-12-28 1942-11-26 Siemens Reiniger Werke Ag Einrichtung zum Entladen des Kondensators eines Kondensatorroentgenapparates beim Zurueckregulieren der Aufnahmespannung
DE1078244B (de) * 1958-04-18 1960-03-24 Siemens Reiniger Werke Ag Roentgendiagnostikapparat mit Initialbelastung
DE1119417B (de) * 1960-08-17 1961-12-14 Siemens Reiniger Werke Ag Schaltungsanordnung zum Loeschen von in Gleichstromkreise eingeschalteten Gas- oder Dampfentladungsstrecken, insbesondere zur Kurzzeitschaltung von Roentgenroehren
DE1167457B (de) * 1963-01-10 1964-04-09 Siemens Reiniger Werke Ag Roentgendiagnostikapparat mit einem im Hochspannungskreis angeordneten steuerbaren-Ventil
JPS55151794A (en) * 1979-05-17 1980-11-26 Toshiba Corp X-ray apparatus

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5241260A (en) * 1989-12-07 1993-08-31 Electromed International High voltage power supply and regulator circuit for an X-ray tube with transient voltage protection
WO2003103346A1 (en) * 2002-05-31 2003-12-11 Philips Intellectual Property & Standards Gmbh X-ray tube
US7123688B2 (en) 2002-05-31 2006-10-17 Koninklijke Philips Electronics, N.V. X-ray tube
WO2010109027A1 (es) * 2009-03-25 2010-09-30 Sociedad Española De Electromedicina Y Calidad, S.A. Modulo de descarga para cables de alta tensión de tubo de rayos-x
CN102484936A (zh) * 2009-03-25 2012-05-30 西班牙电子医药质量公司 用于高压x射线管的放电模块
US8781074B2 (en) 2009-03-25 2014-07-15 Sociedad Espanola De Electromedicina Y Calidad S.A. Discharge module for high voltage x-ray tubes
CN102484936B (zh) * 2009-03-25 2015-03-18 西班牙电子医药质量公司 用于高压x射线管的放电模块

Also Published As

Publication number Publication date
JPS63137500U (enrdf_load_stackoverflow) 1988-09-09

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