EP0151270A1 - Installation de radiodiagnostic - Google Patents

Installation de radiodiagnostic Download PDF

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Publication number
EP0151270A1
EP0151270A1 EP84115058A EP84115058A EP0151270A1 EP 0151270 A1 EP0151270 A1 EP 0151270A1 EP 84115058 A EP84115058 A EP 84115058A EP 84115058 A EP84115058 A EP 84115058A EP 0151270 A1 EP0151270 A1 EP 0151270A1
Authority
EP
European Patent Office
Prior art keywords
signal
radiation detector
ray
control stage
memory
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
EP84115058A
Other languages
German (de)
English (en)
Other versions
EP0151270B1 (fr
Inventor
Udo Heinze
Paul Marhoff
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 EP0151270A1 publication Critical patent/EP0151270A1/fr
Application granted granted Critical
Publication of EP0151270B1 publication Critical patent/EP0151270B1/fr
Expired 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
    • H05G1/30—Controlling
    • H05G1/36—Temperature of anode; Brightness of image power
    • 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
    • H05G1/38—Exposure time
    • H05G1/42—Exposure time using arrangements for switching when a predetermined dose of radiation has been applied, e.g. in which the switching instant is determined by measuring the electrical energy supplied to the tube
    • H05G1/44—Exposure time using arrangements for switching when a predetermined dose of radiation has been applied, e.g. in which the switching instant is determined by measuring the electrical energy supplied to the tube in which the switching instant is determined by measuring the amount of radiation directly
    • 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
    • H05G1/60—Circuit arrangements for obtaining a series of X-ray photographs or for X-ray cinematography

Definitions

  • the invention relates to an x-ray diagnostic system with a control circuit, which has a radiation detector for detecting the average dose in the dominant region and a control stage which influences at least one recording value as a function of the detector output signal.
  • An X-ray diagnostic system of this type in which the control circuit has an integrator for the signal of the radiation detector and the control stage switches off the high voltage on the X-ray tube when a predetermined dose per image is reached.
  • a control circuit of this type is called an automatic exposure device.
  • the exposure machine can have an image intensifier and a downstream photomultiplier as the radiation detector, which detects the average image brightness in the beam path between the exit fluorescent screen of the X-ray image intensifier and an image capturing device in a predetermined range.
  • incorrect exposures can occur if the contrast in the area detected by the radiation detector changes during the series. Such incorrect exposures result, for example, when an X-ray contrast agent flows into the area being scanned, because in this case too the mean image brightness, which is due to the high radiation absorption of the Contrast medium can deviate significantly from a diagnostically useful value.
  • the invention has for its object to provide an X-ray diagnostic system of the type mentioned in such a way that optimum image blackening or brightness is achieved even with a large change in contrast in the area detected by the radiation detector.
  • a tube-near second radiation detector is provided, which is followed by a memory for a signal dependent on the respective dose rate in the last image, that the memory signal is fed as a reference signal to a second control stage and that a changeover switch is present which the first control stage can be switched off and the second control stage can be switched on, to which a signal dependent on the current output signal of the second radiation detector can then be supplied at a second input.
  • a switch is made to a second radiation detector in front of the patient, which also delivers an output signal before the switchover.
  • an X-ray tube 1 is shown, which is fed by an X-ray generator 2 and shines through a patient 3.
  • the x-ray images are first generated on the input fluorescent screen of an x-ray image intensifier 4, the output image of which is recorded by a television camera 5 and displayed on a montior 6. Furthermore, the output image of the X-ray image intensifier 4 can be captured using a film camera 7.
  • a radiation detector 8 is provided, which detects the average image brightness in a predetermined range.
  • a semi-transparent mirror 9 is provided in the beam path between the exit fluorescent screen of the X-ray image intensifier 4 and the television camera 5.
  • Another semitransparent mirror 10 supplies the x-ray image to the film camera 7.
  • the output signal of the photomultiplier 8 is converted via a current-voltage converter 10 into a corresponding voltage, which is integrated in an integrator 11. Accordingly, there is a signal at the input 12 of a switching stage 13 which corresponds to the dose accumulated for an image.
  • a reference signal is applied to input 14 of switching stage 13. As soon as the signal at the input 12 reaches the signal at the input 14, the switching stage 13 switches off the X-ray tube voltage 1 via the switch 15, which initially assumes its fully drawn position.
  • the X-ray diagnostic system shown has a second, near-tube radiation detector 16, the output signal of which is converted via a current-voltage converter 17 into a corresponding voltage which is integrated in an integrator 18.
  • the output signal of the integrator 18 is integrated in a memory 20 via a switch 19 which initially assumes its fully drawn position and is supplied as a reference voltage to a second switching stage 21.
  • the switch 15 separates the output of the switching stage 13 from the X-ray generator 2 and switches the output of the switching stage 21 on.
  • the switch 19 feeds the output signal of the integrator 18 as an actual value signal to the switching stage 21.
  • the setpoint signal is the reference voltage that is supplied by the memory 20.
  • the memory 20 supplies a reference voltage which corresponds to the dose reached in the last picture before the switches 15, 19 were actuated. Before this actuation, it is reset after each image switched by the exposure machine 8 to 13. This also applies to the integrator 18.
  • the images are accordingly switched automatically with a dose which was achieved in the last image of a test series switched by the automatic exposure devices 8 to 13 and which accordingly leads to optimal image blackening.
  • the arrival of a contrast medium in the examined area has no effect on the output signal of the radiation detector 16 and thus on the image blackening.
  • the automatic exposure device 16.to 21 it is achieved that, especially when the automatic exposure device 8 to 13 is switched off, mains voltage fluctuations, changes in the X-ray tube current with unchanged setting value (reaction of the anode), beating phenomena in the case of a non-synchronous cycle of a recording series in which the X-ray tube 1 is pulsed, and influences of transients of the X-ray tube high voltage are corrected.
  • the second exposure machine 16 to 21 can advantageously be used, since in this case there is a requirement for extremely high dose constancy during an entire series of exposures.
  • the dose rate can optionally be regulated with the aid of the radiation detectors 8, 16.
  • each of these radiation detectors 8, 16 is followed by a dose rate controller and an actuator for the dose rate.
  • a radiation detector 8, 16 is optionally connected to the dose rate controller, optionally with the interposition of a transmitter.
  • the dose rate on the X-ray tube 1 is recorded and stored. The saved value then serves as the setpoint after switching. If two dose rate controllers are provided, one of these dose rate controllers is optionally connected to the actuator.
  • a switch 23 is closed to generate a signal proportional to brightness, which bridges the integrator 11. Furthermore, a switch 24 for bridging the integrator 18 is also closed. The dose rate is controlled by an actuator 25 which is switched on by a switch 26.

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • X-Ray Techniques (AREA)
  • Apparatus For Radiation Diagnosis (AREA)
EP84115058A 1984-01-27 1984-12-10 Installation de radiodiagnostic Expired EP0151270B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3402888 1984-01-27
DE19843402888 DE3402888A1 (de) 1984-01-27 1984-01-27 Roentgendiagnostikanlage

Publications (2)

Publication Number Publication Date
EP0151270A1 true EP0151270A1 (fr) 1985-08-14
EP0151270B1 EP0151270B1 (fr) 1987-09-30

Family

ID=6226112

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84115058A Expired EP0151270B1 (fr) 1984-01-27 1984-12-10 Installation de radiodiagnostic

Country Status (4)

Country Link
US (1) US4639943A (fr)
EP (1) EP0151270B1 (fr)
JP (1) JPS60140399U (fr)
DE (2) DE3402888A1 (fr)

Families Citing this family (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61193364U (fr) * 1985-05-24 1986-12-02
US4811373A (en) * 1986-07-14 1989-03-07 Hologic, Inc. Bone densitometer
US5044002A (en) * 1986-07-14 1991-08-27 Hologic, Inc. Baggage inspection and the like
US5040199A (en) * 1986-07-14 1991-08-13 Hologic, Inc. Apparatus and method for analysis using x-rays
US5148455A (en) * 1986-07-14 1992-09-15 Hologic, Inc. Bone densitometer
FR2623389A1 (fr) * 1987-11-24 1989-05-26 Philips Massiot Mat Medic Appareil de destruction de concretions dans un milieu ou un organisme
JP2862172B2 (ja) * 1987-12-18 1999-02-24 株式会社東芝 Ｘ線撮影装置
FR2626432B1 (fr) * 1988-01-25 1995-10-13 Commissariat Energie Atomique Appareil de tomographie a rayons x
JP2548018Y2 (ja) * 1990-01-24 1997-09-17 興和 株式会社 Ｘ線撮像装置
US5003572A (en) * 1990-04-06 1991-03-26 General Electric Company Automatic brightness compensation for x-ray imaging systems
US5319547A (en) * 1990-08-10 1994-06-07 Vivid Technologies, Inc. Device and method for inspection of baggage and other objects
EP0480096B1 (fr) * 1990-10-12 1994-07-13 Siemens Aktiengesellschaft Appareil pour diagnostic aux rayons X comprenant un intensificateur d'image à rayons X et un détecteur de brillance d'image sur son écran de sortie
US5331166A (en) * 1991-10-25 1994-07-19 Kabushiki Kaisha Morita Seisakusho Dental X-ray image detecting device with an automatic exposure function
US5475729A (en) * 1994-04-08 1995-12-12 Picker International, Inc. X-ray reference channel and x-ray control circuit for ring tube CT scanners
US5179582A (en) * 1992-04-20 1993-01-12 S&S Inficon Inc. Exposure control circuit for X-ray generation
US5619042A (en) * 1995-07-20 1997-04-08 Siemens Medical Systems, Inc. System and method for regulating delivered radiation in a radiation-emitting device
US5949811A (en) * 1996-10-08 1999-09-07 Hitachi Medical Corporation X-ray apparatus
US5767518A (en) * 1996-11-27 1998-06-16 Westwood Biomedical Fiber optic x-ray exposure control sensor
JP2005511222A (ja) * 2001-12-11 2005-04-28 コーニンクレッカ　フィリップス　エレクトロニクス　エヌ　ヴィ Ｘ線検査装置及び方法
US7177392B2 (en) * 2002-09-10 2007-02-13 Newton Scientific, Inc. X-ray detector for feedback stabilization of an X-ray tube
DE102004017180B4 (de) * 2004-04-07 2007-08-02 Siemens Ag Röntgendiagnostikeinrichtung zur digitalen Radiographie
DE102014200526B4 (de) * 2014-01-14 2018-09-06 Siemens Healthcare Gmbh Röntgengerät und Röntgenstrahlendetektor für ein Röntgengerät
WO2021177229A1 (fr) * 2020-03-04 2021-09-10 キヤノン株式会社 Système radiographique, dispositif de commande et procédé de commande de système radiographique

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3491239A (en) * 1965-09-22 1970-01-20 Gen Electric X-ray image amplifier system with automatic exposure control
DE1929894A1 (de) * 1968-09-13 1970-07-23 Litton Industries Inc Kinematographische Roentgenstrahleinrichtung
FR2329134A1 (fr) * 1975-10-20 1977-05-20 Siemens Ag Installation de radiodiagnostic pour des prises de vues radiographiques
DE2741052A1 (de) * 1977-09-12 1979-03-22 Siemens Ag Roentgendiagnostikanlage fuer kinoaufnahmen
GB2105032A (en) * 1981-08-13 1983-03-16 Philips Nv X-ray generator incorporating automatic correction of a dose-determining exposure parameter

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2328322A1 (de) * 1973-06-04 1974-12-19 Siemens Ag Roentgendiagnostikapparat zur verwendung mit einem hilfsgeraet, das eine vorgebbare aufnahmezeit erfordert
US3906233A (en) * 1973-10-12 1975-09-16 Varian Associates System and method for administering radiation
FR2286577A1 (fr) * 1974-09-27 1976-04-23 Thomson Csf Appareil radiologique
DE2556699C2 (de) * 1975-12-17 1987-03-12 Philips Patentverwaltung Gmbh, 2000 Hamburg Röntgengenerator mit Belichtungsautomatik
DE2701433A1 (de) * 1977-01-14 1978-07-20 Siemens Ag Roentgendiagnostikgenerator zur durchleuchtung und aufnahme
SU959298A1 (ru) * 1981-02-03 1982-09-15 Московский Ордена Трудового Красного Знамени Научно-Исследовательский Рентгено-Радиологический Институт Мз Рсфср Рентгеновский флюорограф

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3491239A (en) * 1965-09-22 1970-01-20 Gen Electric X-ray image amplifier system with automatic exposure control
DE1929894A1 (de) * 1968-09-13 1970-07-23 Litton Industries Inc Kinematographische Roentgenstrahleinrichtung
FR2329134A1 (fr) * 1975-10-20 1977-05-20 Siemens Ag Installation de radiodiagnostic pour des prises de vues radiographiques
DE2741052A1 (de) * 1977-09-12 1979-03-22 Siemens Ag Roentgendiagnostikanlage fuer kinoaufnahmen
GB2105032A (en) * 1981-08-13 1983-03-16 Philips Nv X-ray generator incorporating automatic correction of a dose-determining exposure parameter

Also Published As

Publication number Publication date
DE3402888A1 (de) 1985-08-01
EP0151270B1 (fr) 1987-09-30
US4639943A (en) 1987-01-27
JPS60140399U (ja) 1985-09-17
DE3466638D1 (en) 1987-11-05

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