EP0362427A1 - X-ray diagnostic apparatus with a detector for the average image brightness - Google Patents

X-ray diagnostic apparatus with a detector for the average image brightness Download PDF

Info

Publication number
EP0362427A1
EP0362427A1 EP88116488A EP88116488A EP0362427A1 EP 0362427 A1 EP0362427 A1 EP 0362427A1 EP 88116488 A EP88116488 A EP 88116488A EP 88116488 A EP88116488 A EP 88116488A EP 0362427 A1 EP0362427 A1 EP 0362427A1
Authority
EP
European Patent Office
Prior art keywords
detector
detector elements
ray diagnostic
body part
image brightness
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
EP88116488A
Other languages
German (de)
French (fr)
Other versions
EP0362427B1 (en
Inventor
Werner Dipl.-Ing. Dr. Kühnel
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
Priority to DE8888116488T priority Critical patent/DE3877960D1/en
Priority to EP88116488A priority patent/EP0362427B1/en
Priority to US07/410,346 priority patent/US4982418A/en
Priority to JP1989116558U priority patent/JPH087841Y2/en
Publication of EP0362427A1 publication Critical patent/EP0362427A1/en
Application granted granted Critical
Publication of EP0362427B1 publication Critical patent/EP0362427B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • H05G1/38—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
    • H05G1/26—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
    • 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
    • H05G1/64—Circuit arrangements for X-ray apparatus incorporating image intensifiers

Definitions

  • the invention relates to an X-ray diagnostic system with a detector for the average image brightness in a predetermined area, which is formed by a matrix of detector elements, wherein a control device is present which selects predetermined elements for signal generation.
  • a detector of this type can be used, for example, for automatic exposure control for exposure or fluoroscopy.
  • the average image brightness should be recorded in an area corresponding to the organ or body part to be recorded and kept constant or regulated.
  • the selected measuring field must be adapted as best as possible to the part of the body to be imaged.
  • the invention has for its object to provide an X-ray diagnostic system of the type mentioned in such a way that a large number of measuring fields with a variable shape can be selected, the respectively selected measuring field being optimally adaptable to the particular circumstances.
  • a control device has a memory for a large amount of data sets according to the body parts shown in each case and that a selection device for selecting the respective data set corresponding to the respective body part and a stored absorption profile is present.
  • a typical two-dimensional coarse absorption profile of the fluoroscopic image is stored in the selection device for a body part to be examined. This profile is compared in the sense of a pattern recognition with the currently available signals of the detector elements, from which the exact type and position of the body part to be examined in the image can be determined. The detector elements required for correct exposure of the body part are then automatically selected by the selection device.
  • FIG. 1 shows an X-ray tube 1, which is fed by an X-ray generator 2.
  • a patient 3 is irradiated by the X-rays.
  • the x-ray image is amplified by an x-ray image intensifier 4.
  • the amplified x-ray image appearing on the output screen of the x-ray image intensifier 4 is recorded by a television camera 5 and displayed on a display unit 7 via a television center 6.
  • a semiconductor detector 8 is provided as an actual value transmitter, which feeds a corresponding signal to the actual value input of a comparator 9 via a measuring transducer 10.
  • the comparator 9 has a setpoint input 11 at which the setpoint of the middle one Image brightness is in the measuring field of the output screen of the X-ray image intensifier 4 corresponding signal.
  • the x-ray generator 2 is influenced by a brightness control device 13 in the sense of an adjustment of the actual value to the target value.
  • a setpoint generator 12 is provided for setting the setpoint.
  • the semiconductor detector 8 has an area on which the entire output image of the X-ray image intensifier 4 can be imaged, with the aid of a partially transparent mirror 14 in the beam path between the exit fluorescent screen of the X-ray image intensifier 4 and the television camera 5.
  • a control device 15 selects a predetermined area of the semiconductor detector 8 electronically according to the desired measuring field.
  • the semiconductor detector 8 allows the selection of a large number of measuring fields, both with regard to their position and their shape and size.
  • the control device 15 contains a memory 17 for a large number of data records corresponding to the body parts shown in each case.
  • the memory 17 is controlled by a selection device 18 for selecting the respective data record corresponding to the respective body part and an absorption profile stored in the selection device 18.
  • a large amount of information corresponding to the body parts occurring in practice is stored in the selection device 18 as two-dimensional coarse absorption profiles of the fluoroscopic image.
  • the total of the output signals of the detector elements of the semiconductor detector 8, which according to FIG. 2 consists of a matrix of detector elements 16, is compared with the stored absorption profiles in the selection device 18 in the sense of a pattern recognition, from which the exact type and position of the body part to be examined can be seen Let picture determine.
  • the detector elements 16 necessary for the correct exposure of the body part are then automatically selected with the aid of the selection device 18 and the control device 15.
  • FIG. 2 shows that with a correspondingly fine division of the detector 8, an exact adaptation of the predetermined range, within which the mean image brightness is to be kept constant during the fluoroscopy, is possible to the examined body part.
  • the information corresponding to the respective body part and selecting the detector elements 16 can be obtained from the entirety of the output signals of the detector elements 16.
  • the described automatic selection of the measuring field can in principle also be extended to the direct recording technique if the measuring chamber is subdivided sufficiently.
  • a further relief for the examiner is possible if additional information about the exact position of the examined organ is evaluated, e.g. with automatic positioning of a heart contour diaphragm, a corresponding signal.

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Apparatus For Radiation Diagnosis (AREA)
  • X-Ray Techniques (AREA)
  • Closed-Circuit Television Systems (AREA)

Abstract

In an X-ray diagnostic apparatus with a detector for the average image brightness in a prescribed region, which is formed by a matrix of detector elements, the aim is for the measuring field selection to take place automatically in an optimum fashion. …<??>A control device (15) contains a memory (17) for a multiplicity of data records corresponding to the particular body parts represented. A selection device (18) automatically selects the particular data record according to the particular body part and a stored absorption profile on the basis of a pattern recognition. …<IMAGE>…

Description

Die Erfindung betrifft eine Röntgendiagnostikanlage mit einem Detektor für die mittlere Bildhelligkeit in einem vorbestimmten Bereich, der von einer Matrix aus Detektorelementen gebildet ist, wobei eine Steuervorrichtung vorhanden ist, die vorbe­stimmte Elemente zur Signalerzeugung auswählt.The invention relates to an X-ray diagnostic system with a detector for the average image brightness in a predetermined area, which is formed by a matrix of detector elements, wherein a control device is present which selects predetermined elements for signal generation.

Ein Detektor dieser Art kann beispielsweise für die automati­sche Belichtungsregelung für Aufnahme oder Durchleuchtung ver­wendet werden. Dabei sollte die mittlere Bildhelligkeit in ei­nem dem jeweils aufzunehmenden Organ oder Körperteil entspre­chenden Bereich erfaßt und konstant gehalten bzw. geregelt wer­den. Hierfür ist es bekannt, eine fest vorgegebene Anzahl von Meßfeldern innerhalb des Detektors vorzusehen. Wird ein Detek­tor mit einer Matrix aus Halbleiter-Detektorelementen verwen­det, so können je nach Anwahl der einzelnen Detektorelemente beliebige Meßfeldformen realisiert werden, wobei auch ein schneller Wechsel möglich ist. Darüber hinaus ist es möglich, die Signale der angewählten Detektorelemente unterschiedlich zu bewerten.A detector of this type can be used, for example, for automatic exposure control for exposure or fluoroscopy. The average image brightness should be recorded in an area corresponding to the organ or body part to be recorded and kept constant or regulated. For this purpose, it is known to provide a predetermined number of measuring fields within the detector. If a detector with a matrix of semiconductor detector elements is used, any measuring field shapes can be realized depending on the selection of the individual detector elements, and a quick change is also possible. In addition, it is possible to evaluate the signals of the selected detector elements differently.

Für eine einwandfreie Belichtung muß das ausgewählte Meßfeld dem abzubildenden Körperteil bestmöglich angepaßt werden.For a perfect exposure, the selected measuring field must be adapted as best as possible to the part of the body to be imaged.

Der Erfindung liegt die Aufgabe zugrunde, eine Röntgendiagno­stikanlage der eingangs genannten Art so auszubilden, daß eine Vielzahl von Meßfeldern mit variabler Form wählbar ist, wobei das jeweils gewählte Meßfeld optimal den jeweiligen Gegebenhei­ten anpaßbar ist.The invention has for its object to provide an X-ray diagnostic system of the type mentioned in such a way that a large number of measuring fields with a variable shape can be selected, the respectively selected measuring field being optimally adaptable to the particular circumstances.

Diese Aufgabe ist erfindungsgemäß dadurch gelöst, daß eine Steuervorrichtung einen Speicher für eine Vielzahl von Daten­ sätzen entsprechend den jeweils dargestellten Körperteilen auf­weist und daß eine Wählvorrichtung zum Auswählen des jeweiligen Datensatzes entsprechend dem jeweiligen Körperteil und einem gespeicherten Absorptionsprofil vorhanden ist. Bei der erfin­dungsgemäßen Röntgendiagnostikanlage wird in der Wählvorrich­tung für einen zu untersuchenden Körperteil ein typisches zwei­dimensionales Grob-Absorptionsprofil des Durchleuchtungsbildes gespeichert. Dieses Profil wird im Sinne einer Mustererkennung mit den aktuell vorliegenden Signalen der Detektorelemente ver­glichen, woraus sich die genaue Art und Lage des zu unter­suchenden Körperteiles im Bild bestimmen lassen. Daran an­schließend werden die zur richtigen Belichtung des Körperteiles notwendigen Detektorelemente automatisch durch die Wählvorrich­tung ausgewählt.This object is achieved in that a control device has a memory for a large amount of data sets according to the body parts shown in each case and that a selection device for selecting the respective data set corresponding to the respective body part and a stored absorption profile is present. In the X-ray diagnostic system according to the invention, a typical two-dimensional coarse absorption profile of the fluoroscopic image is stored in the selection device for a body part to be examined. This profile is compared in the sense of a pattern recognition with the currently available signals of the detector elements, from which the exact type and position of the body part to be examined in the image can be determined. The detector elements required for correct exposure of the body part are then automatically selected by the selection device.

Die Erfindung ist nachfolgend anhand eines in der Zeichnung dargestellten Ausführungsbeispieles näher erläutert. Es zeigen:

  • Fig. 1 eine Röntgendiagnostikanlage nach der Erfindung, und
  • Fig. 2 eine Ansicht des Detektors der Röntgendiagnostikanlage gemäß Fig. 1 zur Erläuterung des Erfindungsgedankens.
The invention is explained below with reference to an embodiment shown in the drawing. Show it:
  • Fig. 1 is an X-ray diagnostic system according to the invention, and
  • FIG. 2 is a view of the detector of the X-ray diagnostic system according to FIG. 1 to explain the inventive concept.

In der Fig. 1 ist eine Röntgenröhre 1 dargestellt, die von ei­nem Röntgengenerator 2 gespeist wird. Ein Patient 3 wird von der Röntgenstrahlung durchstrahlt. Das Röntgenbild wird von ei­nem Röntgenbildverstärker 4 verstärkt. Das am Ausgangsbild­schirm des Röntgenbildverstärkers 4 erscheinende, verstärkte Röntgenbild wird von einer Fernsehkamera 5 aufgenommen und über eine Fernsehzentrale 6 auf einem Sichtgerät 7 wiedergegeben.1 shows an X-ray tube 1, which is fed by an X-ray generator 2. A patient 3 is irradiated by the X-rays. The x-ray image is amplified by an x-ray image intensifier 4. The amplified x-ray image appearing on the output screen of the x-ray image intensifier 4 is recorded by a television camera 5 and displayed on a display unit 7 via a television center 6.

Zur Konstanthaltung der mittleren Bildhelligkeit in einem Meß­feld des Ausgangsschirmes des Röntgenbildverstärkers 4 ist ein Halbleiterdetektor 8 als Istwertgeber vorgesehen, der ein ent­sprechendes Signal dem Istwerteingang eines Vergleichers 9 über einen Meßwandler 10 zuführt. Der Vergleicher 9 weist einen Sollwerteingang 11 auf, an dem ein dem Sollwert der mittleren Bildhelligkeit im Meßfeld des Ausgangsschirmes des Röntgenbild­verstärkers 4 entsprechendes Signal liegt. In Abhängigkeit von der Differenz zwischen Ist- und Sollwert wird der Röntgengene­rator 2 von einer Helligkeitsregeleinrichtung 13 im Sinne eines Angleiches des Istwertes an den Sollwert beeinflußt. Für die Einstellung des Sollwertes ist ein Sollwertgeber 12 vorgesehen.To keep the mean image brightness constant in a measuring field of the output screen of the X-ray image intensifier 4, a semiconductor detector 8 is provided as an actual value transmitter, which feeds a corresponding signal to the actual value input of a comparator 9 via a measuring transducer 10. The comparator 9 has a setpoint input 11 at which the setpoint of the middle one Image brightness is in the measuring field of the output screen of the X-ray image intensifier 4 corresponding signal. Depending on the difference between the actual value and the target value, the x-ray generator 2 is influenced by a brightness control device 13 in the sense of an adjustment of the actual value to the target value. A setpoint generator 12 is provided for setting the setpoint.

Der Halbleiterdetektor 8 hat eine Fläche, auf der das ganze Ausgangsbild des Röntgenbildverstärkers 4 abbildbar ist, und zwar mit Hilfe eines teildurchlässigen Spiegels 14 im Strahlen­gang zwischen dem Ausgangsleuchtschirm des Röntgenbildverstär­kers 4 und der Fernsehkamera 5. Eine Steuervorrichtung 15 wählt dabei einen vorbestimmten Bereich des Halbleiterdetektors 8 entsprechend dem gewünschten Meßfeld elektronisch aus. Der Halbleiterdetektor 8 erlaubt dabei die Wahl einer Vielzahl von Meßfeldern, und zwar sowohl hinsichtlich ihrer Lage als auch ihrer Form und Größe.The semiconductor detector 8 has an area on which the entire output image of the X-ray image intensifier 4 can be imaged, with the aid of a partially transparent mirror 14 in the beam path between the exit fluorescent screen of the X-ray image intensifier 4 and the television camera 5. A control device 15 selects a predetermined area of the semiconductor detector 8 electronically according to the desired measuring field. The semiconductor detector 8 allows the selection of a large number of measuring fields, both with regard to their position and their shape and size.

Die Steuervorrichtung 15 enthält einen Speicher 17 für eine Vielzahl von Datensätzen entsprechend den jeweils dargestellten Körperteilen. Der Speicher 17 wird von einer Wählvorrichtung 18 zum Auswählen des jeweiligen Datensatzes entsprechend dem je­weiligen Körperteil und einem in der Wählvorrichtung 18 gespei­cherten Absorptionsprofil angesteuert.The control device 15 contains a memory 17 for a large number of data records corresponding to the body parts shown in each case. The memory 17 is controlled by a selection device 18 for selecting the respective data record corresponding to the respective body part and an absorption profile stored in the selection device 18.

In der Wählvorrichtung 18 ist eine Vielzahl von Informationen entsprechend den in der Praxis vorkommenden Körperteilen als zweidimensionale Grob-Absorptionsprofile des Durchleuchtungs­bildes gespeichert. Die Gesamtheit der Ausgangssignale der De­tektorelemente des Halbleiterdetektors 8, der gemäß Fig. 2 aus einer Matrix von Detektorelementen 16 besteht, wird mit den ge­speicherten Absorptionsprofilen in der Wählvorrichtung 18 im Sinne einer Mustererkennung verglichen, woraus sich die genaue Art und Lage des zu untersuchenden Körperteiles im Bild bestim­men lassen. Die zur richtigen Belichtung des Körperteiles not­wendigen Detektorelemente 16 werden dann mit Hilfe der Wählvor­richtung 18 und der Steuervorrichtung 15 automatisch ausge­wählt.A large amount of information corresponding to the body parts occurring in practice is stored in the selection device 18 as two-dimensional coarse absorption profiles of the fluoroscopic image. The total of the output signals of the detector elements of the semiconductor detector 8, which according to FIG. 2 consists of a matrix of detector elements 16, is compared with the stored absorption profiles in the selection device 18 in the sense of a pattern recognition, from which the exact type and position of the body part to be examined can be seen Let picture determine. The detector elements 16 necessary for the correct exposure of the body part are then automatically selected with the aid of the selection device 18 and the control device 15.

In der Fig. 2 sind dunkel als Beispiel ausgewählte Detektorele­mente 16 dargestellt. Die Fig. 2 zeigt, daß bei entsprechend feiner Unterteilung des Detektors 8 eine genaue Anpassung des vorbestimmten Bereiches, innerhalb dessen die mittlere Bildhel­ligkeit bei der Durchleuchtung konstant gehalten werden soll, an das untersuchte Körperteil möglich ist.2, detector elements 16 selected in the dark are shown as an example. FIG. 2 shows that with a correspondingly fine division of the detector 8, an exact adaptation of the predetermined range, within which the mean image brightness is to be kept constant during the fluoroscopy, is possible to the examined body part.

Die dem jeweiligen Körperteil entsprechenden, die Detektor­elemente 16 auswählende Information kann wie beschrieben aus der Gesamtheit der Ausgangssignale der Detektorelemente 16 ge­wonnen werden. Es ist aber auch möglich, hierzu das Videosignal der Bildverstärker-Fernsehkette 4, 5, 6, 7 entsprechend der in Fig. 1 gestrichelt gezeichneten Linie zu verwenden.As described, the information corresponding to the respective body part and selecting the detector elements 16 can be obtained from the entirety of the output signals of the detector elements 16. However, it is also possible to use the video signal of the image intensifier television chain 4, 5, 6, 7 corresponding to the line drawn in broken lines in FIG. 1.

Die beschriebene automatische Bildung des jeweils optimalen Be­reiches, innerhalb dessen die Erfassung der Ausgangssignale der Detektorelemente zur Durchleuchtungsregelung erfolgt, kann auch für die Indirekt-Aufnahmetechnik vorgenommen werden. Für den Aufnahmebetrieb kann demgemäß zur Meßfeldanwahl entweder das vorangegangene Durchleuchtungsbild ausgewertet werden oder wenn die Mustererkennung schnell genug erfolgt auch das Aufnahmebild selbst.The described automatic formation of the optimum range in each case, within which the detection of the output signals of the detector elements for fluoroscopic control takes place, can also be carried out for the indirect recording technology. Accordingly, for recording operation, either the previous fluoroscopic image can be evaluated in order to select the measuring field, or if the pattern recognition is carried out quickly enough, the recording image itself is also carried out.

Die beschriebene automatische Auswahl des Meßfeldes läßt sich prinzipiell auch auf die direkte Aufnahmetechnik erweitern, wenn die Meßkammer fein genug unterteilt wird.The described automatic selection of the measuring field can in principle also be extended to the direct recording technique if the measuring chamber is subdivided sufficiently.

Eine weitere Entlastung des Untersuchers ist möglich, wenn eine zusätzliche Information über die genaue Position des untersuch­ten Organs ausgewertet wird, z.B. bei automatischer Positionie­rung einer Herzkonturenblende ein entsprechendes Signal.A further relief for the examiner is possible if additional information about the exact position of the examined organ is evaluated, e.g. with automatic positioning of a heart contour diaphragm, a corresponding signal.

Claims (3)

1. Röntgendiagnostikanlage mit einem Detektor (8) für die mitt­lere Bildhelligkeit in einem vorbestimmten Bereich, der von einer Matrix aus Detektorelementen (16) gebildet ist, wobei eine Steuervorrichtung (15) vorhanden ist, die vorbestimmte Detektorelemente (16) zur Signalerzeugung auswählt, da­durch gekennzeichnet, daß die Steuervor­richtung (15) einen Speicher (17) für eine Vielzahl von Daten­sätzen entsprechend den jeweils dargestellten Körperteilen auf­weist und daß eine Wählvorrichtung (18) zum Auswählen des je­weiligen Datensatzes entsprechend dem jeweiligen Körperteil und einem gespeicherten Absorptionsprofil vorhanden ist.1. X-ray diagnostic system with a detector (8) for the average image brightness in a predetermined area, which is formed by a matrix of detector elements (16), a control device (15) being present, which selects predetermined detector elements (16) for signal generation, thereby characterized in that the control device (15) has a memory (17) for a large number of data records corresponding to the respective body parts shown and that a selection device (18) for selecting the respective data record corresponding to the respective body part and a stored absorption profile is provided. 2. Röntgendiagnostikanlage nach Anspruch 1, dadurch gekennzeichnet, daß die dem jeweiligen Körper­teil entsprechende, die Detektorelemente (16) auswählende In­formation aus der Gesamtheit der Ausgangssignale der Detektor­elemente (16) gewonnen wird.2. X-ray diagnostic system according to claim 1, characterized in that the information corresponding to the respective body part, the detector elements (16) is selected from the totality of the output signals of the detector elements (16). 3. Röntgendiagnostikanlage nach Anspruch 1, dadurch gekennzeichnet, daß die dem jeweiligen Körper­teil entsprechende, die Detektorelemente (16) auswählende In­formation aus dem Videosignal einer Bildverstärker-Fernsehkette (4, 5, 6, 7) gewonnen wird.3. X-ray diagnostic system according to claim 1, characterized in that the corresponding body part, the detector elements (16) selecting information from the video signal of an image intensifier television chain (4, 5, 6, 7) is obtained.
EP88116488A 1988-10-05 1988-10-05 X-ray diagnostic apparatus with a detector for the average image brightness Expired - Lifetime EP0362427B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE8888116488T DE3877960D1 (en) 1988-10-05 1988-10-05 X-RAY DIAGNOSTIC SYSTEM WITH A DETECTOR FOR THE MEDIUM IMAGE BRIGHTNESS.
EP88116488A EP0362427B1 (en) 1988-10-05 1988-10-05 X-ray diagnostic apparatus with a detector for the average image brightness
US07/410,346 US4982418A (en) 1988-10-05 1989-09-21 X-ray diagnostics installation having a mean image brightness detector
JP1989116558U JPH087841Y2 (en) 1988-10-05 1989-10-03 X-ray diagnostic device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP88116488A EP0362427B1 (en) 1988-10-05 1988-10-05 X-ray diagnostic apparatus with a detector for the average image brightness

Publications (2)

Publication Number Publication Date
EP0362427A1 true EP0362427A1 (en) 1990-04-11
EP0362427B1 EP0362427B1 (en) 1993-01-27

Family

ID=8199427

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88116488A Expired - Lifetime EP0362427B1 (en) 1988-10-05 1988-10-05 X-ray diagnostic apparatus with a detector for the average image brightness

Country Status (4)

Country Link
US (1) US4982418A (en)
EP (1) EP0362427B1 (en)
JP (1) JPH087841Y2 (en)
DE (1) DE3877960D1 (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0429977A2 (en) * 1989-11-24 1991-06-05 Shimadzu Corporation Radiation imaging apparatus
EP0435528A2 (en) * 1989-12-26 1991-07-03 General Electric Company X-ray system
EP0480096A1 (en) * 1990-10-12 1992-04-15 Siemens Aktiengesellschaft X-ray diagnostic apparatus comprising an X-ray image intensifier and a detector for its output screen image brightness
DE4300829A1 (en) * 1993-01-14 1994-07-21 Siemens Ag X-ray diagnostic device
WO1995025990A2 (en) * 1994-03-21 1995-09-28 Siemens Aktiengesellschaft Fuzzy-logic regulating system, in particular for regulating the dosing power of x-ray diagnosing apparatus
WO1996020579A1 (en) * 1994-12-23 1996-07-04 Philips Electronics N.V. X-ray examination apparatus comprising an exposure control circuit
EP0748148A1 (en) * 1995-06-06 1996-12-11 General Electric Company Digital brightness detector
EP0849980A1 (en) * 1996-12-20 1998-06-24 General Electric Company An x-ray imaging system using an image detector
WO2000035254A1 (en) * 1998-12-08 2000-06-15 Koninklijke Philips Electronics N.V. An x-ray examination apparatus having an object absorption dependent brightness control

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2548018Y2 (en) * 1990-01-24 1997-09-17 興和 株式会社 X-ray imaging device
JP3197559B2 (en) * 1990-07-02 2001-08-13 バリアン・メディカル・システムズ・インコーポレイテッド Computer X-ray tomography apparatus using image enhanced detector
DE4102445C1 (en) * 1991-01-28 1992-03-05 Siemens Ag, 8000 Muenchen, De
FI941589A (en) * 1994-04-07 1996-01-12 Stig Svensson Device for taking X-rays
US5617462A (en) * 1995-08-07 1997-04-01 Oec Medical Systems, Inc. Automatic X-ray exposure control system and method of use
DE19606873C2 (en) * 1996-02-23 2000-10-12 Siemens Ag X-ray diagnostic device with a solid-state image converter
WO1998048599A2 (en) * 1997-04-24 1998-10-29 Koninklijke Philips Electronics N.V. Exposure control on the basis of a relevant part of an x-ray image
US6175614B1 (en) * 1999-05-07 2001-01-16 Oec Medical Systems, Inc. Method and apparatus for automatic sizing and positioning of ABS sampling window in an x-ray imaging system
DE19934980B4 (en) 1999-07-26 2004-02-12 Siemens Ag X-ray diagnostic device with a flat X-ray image converter with back lighting
DE102004017180B4 (en) * 2004-04-07 2007-08-02 Siemens Ag X-ray diagnostic device for digital radiography
US20060079753A1 (en) * 2004-09-27 2006-04-13 Michael Gurley Pre-acquisition identification of region for image acquisition time optimization for radiation imaging systems

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4076985A (en) * 1973-08-18 1978-02-28 Emi Limited Computerized tomographic scanner with beam distribution control
US4185198A (en) * 1976-07-08 1980-01-22 Tokyo Shibaura Electric Co., Ltd. Means for generating an X-ray exposure command in response to a video signal component
EP0063644A1 (en) * 1981-04-23 1982-11-03 VEB Transformatoren- und Röntgenwerk "Hermann Matern" Method of producing X-ray exposures
DE3225061A1 (en) * 1982-07-05 1984-01-05 Siemens AG, 1000 Berlin und 8000 München X-RAY DIAGNOSTIC DEVICE
DE3523514A1 (en) * 1984-07-03 1986-01-09 Kabushiki Kaisha Toshiba, Kawasaki, Kanagawa DIGITAL X-RAY EXAMINATION DEVICE
EP0217456A1 (en) * 1985-09-20 1987-04-08 Koninklijke Philips Electronics N.V. An X-ray examination apparatus with a locally divided auxiliary detector

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2740998A1 (en) * 1977-09-12 1979-03-22 Siemens Ag X=ray medical diagnostic apparatus - has scanning direction varied to correspond with direction in which observer is looking
DE2803913C2 (en) * 1978-01-30 1986-01-30 Siemens AG, 1000 Berlin und 8000 München X-ray diagnostic system with an image intensifier television chain
JPS5773900U (en) * 1980-10-24 1982-05-07
JPS5875800A (en) * 1981-10-30 1983-05-07 Hitachi Medical Corp Automatic x-ray exposure apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4076985A (en) * 1973-08-18 1978-02-28 Emi Limited Computerized tomographic scanner with beam distribution control
US4185198A (en) * 1976-07-08 1980-01-22 Tokyo Shibaura Electric Co., Ltd. Means for generating an X-ray exposure command in response to a video signal component
EP0063644A1 (en) * 1981-04-23 1982-11-03 VEB Transformatoren- und Röntgenwerk "Hermann Matern" Method of producing X-ray exposures
DE3225061A1 (en) * 1982-07-05 1984-01-05 Siemens AG, 1000 Berlin und 8000 München X-RAY DIAGNOSTIC DEVICE
DE3523514A1 (en) * 1984-07-03 1986-01-09 Kabushiki Kaisha Toshiba, Kawasaki, Kanagawa DIGITAL X-RAY EXAMINATION DEVICE
EP0217456A1 (en) * 1985-09-20 1987-04-08 Koninklijke Philips Electronics N.V. An X-ray examination apparatus with a locally divided auxiliary detector

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0429977A2 (en) * 1989-11-24 1991-06-05 Shimadzu Corporation Radiation imaging apparatus
EP0429977A3 (en) * 1989-11-24 1991-12-04 Shimadzu Corporation Radiation imaging apparatus
US5151588A (en) * 1989-11-24 1992-09-29 Shimadzu Corporation Radiation imaging apparatus having detection elements of varying sizes
EP0435528A2 (en) * 1989-12-26 1991-07-03 General Electric Company X-ray system
EP0435528A3 (en) * 1989-12-26 1991-11-27 General Electric Company X-ray system
EP0480096A1 (en) * 1990-10-12 1992-04-15 Siemens Aktiengesellschaft X-ray diagnostic apparatus comprising an X-ray image intensifier and a detector for its output screen image brightness
DE4300829A1 (en) * 1993-01-14 1994-07-21 Siemens Ag X-ray diagnostic device
WO1995025990A2 (en) * 1994-03-21 1995-09-28 Siemens Aktiengesellschaft Fuzzy-logic regulating system, in particular for regulating the dosing power of x-ray diagnosing apparatus
WO1995025990A3 (en) * 1994-03-21 1995-11-16 Siemens Ag Fuzzy-logic regulating system, in particular for regulating the dosing power of x-ray diagnosing apparatus
US5845269A (en) * 1994-03-21 1998-12-01 Siemens Aktiengesellschaft Fuzzy control system, particularly for dose rate control in an X-ray diagnostics apparatus
WO1996020579A1 (en) * 1994-12-23 1996-07-04 Philips Electronics N.V. X-ray examination apparatus comprising an exposure control circuit
EP0748148A1 (en) * 1995-06-06 1996-12-11 General Electric Company Digital brightness detector
EP0849980A1 (en) * 1996-12-20 1998-06-24 General Electric Company An x-ray imaging system using an image detector
WO2000035254A1 (en) * 1998-12-08 2000-06-15 Koninklijke Philips Electronics N.V. An x-ray examination apparatus having an object absorption dependent brightness control

Also Published As

Publication number Publication date
DE3877960D1 (en) 1993-03-11
JPH0260375U (en) 1990-05-02
JPH087841Y2 (en) 1996-03-06
US4982418A (en) 1991-01-01
EP0362427B1 (en) 1993-01-27

Similar Documents

Publication Publication Date Title
EP0362427B1 (en) X-ray diagnostic apparatus with a detector for the average image brightness
DE69833128T2 (en) FORMATION OF A COMPILED IMAGE FROM SUBSEQUENT X-RAY IMAGES
DE3201658C2 (en) Method for generating X-ray image data and X-ray diagnostic device
DE2815218C2 (en)
DE4402240B4 (en) System and method for digital X-ray imaging
DE69616030T2 (en) X-RAY EXAMINATION DEVICE INCLUDING AN IMAGE MATRIX WITH CORRECTION UNIT
DE4133066C2 (en) Digital panoramic x-ray device
DE1941433C3 (en) Apparatus for examining a living body by X-rays or γ-rays
DE69321013T2 (en) Imaging system with means for compensating for vignetting and X-ray examination device containing such an imaging system
EP0024028B1 (en) X-ray apparatus for tomography and shadow radiography
EP0312850B1 (en) X-ray diagnostic apparatus
DE3037621A1 (en) TRANSLUCTION ARRANGEMENT FOR TAKING LAYER IMAGES OF A THREE-DIMENSIONAL OBJECT
EP0234603A2 (en) X-ray generator with control of dosing power
DE10314536A1 (en) Method of generating an X-ray
DE69631283T2 (en) X-RAY EXAMINATION DEVICE WITH DOSAGE CONTROL
DE19651722A1 (en) Automatic exposure setting method for panorama or tomographic radiography device
DE68922956T2 (en) Diagnostic x-ray machine.
EP0480096A1 (en) X-ray diagnostic apparatus comprising an X-ray image intensifier and a detector for its output screen image brightness
EP0106402B1 (en) Method of producing tomographic images
DE4329691A1 (en) Scanner for an X=ray image stored on phosphorescent plate - having controllable system to ensure constant signal intensity from image regions of varying density
DE102006048233A1 (en) X-ray arrangement for patient examination, has computing unit with converter having input device for complete data set of simply adjustable system parameters that are fed by user for convert into complete data set of image chain parameters
DE19525678A1 (en) Adjustment of picture quality from panoramic X-rays
DE4137724C2 (en) Digital radiography system with an X-ray image intensifier tube
DE19755764C2 (en) Method for operating an X-ray diagnostic device with an X-ray image converter television chain and device for carrying out such a method
DE1764414B2 (en) X-ray film imaging device with a drive for generating a film movement and with a TV set

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB

17P Request for examination filed

Effective date: 19900509

17Q First examination report despatched

Effective date: 19920406

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19930127

Ref country code: GB

Effective date: 19930127

REF Corresponds to:

Ref document number: 3877960

Country of ref document: DE

Date of ref document: 19930311

EN Fr: translation not filed
GBV Gb: ep patent (uk) treated as always having been void in accordance with gb section 77(7)/1977 [no translation filed]

Effective date: 19930127

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20071214

Year of fee payment: 20