EP0362427B1 - Röntgendiagnostikanlage mit einem Detektor für die mittlere Bildhelligkeit - Google Patents

Röntgendiagnostikanlage mit einem Detektor für die mittlere Bildhelligkeit Download PDF

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Publication number
EP0362427B1
EP0362427B1 EP88116488A EP88116488A EP0362427B1 EP 0362427 B1 EP0362427 B1 EP 0362427B1 EP 88116488 A EP88116488 A EP 88116488A EP 88116488 A EP88116488 A EP 88116488A EP 0362427 B1 EP0362427 B1 EP 0362427B1
Authority
EP
European Patent Office
Prior art keywords
detector
ray diagnostic
detector elements
image brightness
control 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
EP88116488A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0362427A1 (de
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/de
Priority to EP88116488A priority patent/EP0362427B1/de
Priority to US07/410,346 priority patent/US4982418A/en
Priority to JP1989116558U priority patent/JPH087841Y2/ja
Publication of EP0362427A1 publication Critical patent/EP0362427A1/de
Application granted granted Critical
Publication of EP0362427B1 publication Critical patent/EP0362427B1/de
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
    • H05G1/26—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 range, the detector being formed from a matrix of detector elements and a control device being present which selects predetermined elements for signal generation for the image brightness control.
  • 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.
  • An X-ray diagnostic system according to the preamble of claim 1 is known from EP-A-0 217 456.
  • 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 with a large number of data records for the selection of the detector elements corresponding to the body parts shown in each case and that a selection device for selecting the respective data set after recognizing the respective body part shown is connected to the control device by comparison with absorption profiles of body parts occurring in the selection device.
  • a typical two-dimensional coarse absorption profile of the fluoroscopic image can be 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 a surface on which the entire output image of the X-ray image intensifier 4 can be reproduced, 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)
EP88116488A 1988-10-05 1988-10-05 Röntgendiagnostikanlage mit einem Detektor für die mittlere Bildhelligkeit Expired - Lifetime EP0362427B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE8888116488T DE3877960D1 (de) 1988-10-05 1988-10-05 Roentgendiagnostikanlage mit einem detektor fuer die mittlere bildhelligkeit.
EP88116488A EP0362427B1 (de) 1988-10-05 1988-10-05 Röntgendiagnostikanlage mit einem Detektor für die mittlere Bildhelligkeit
US07/410,346 US4982418A (en) 1988-10-05 1989-09-21 X-ray diagnostics installation having a mean image brightness detector
JP1989116558U JPH087841Y2 (ja) 1988-10-05 1989-10-03 Ｘ線診断装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP88116488A EP0362427B1 (de) 1988-10-05 1988-10-05 Röntgendiagnostikanlage mit einem Detektor für die mittlere Bildhelligkeit

Publications (2)

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

Family

ID=8199427

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88116488A Expired - Lifetime EP0362427B1 (de) 1988-10-05 1988-10-05 Röntgendiagnostikanlage mit einem Detektor für die mittlere Bildhelligkeit

Country Status (4)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004017180B4 (de) * 2004-04-07 2007-08-02 Siemens Ag Röntgendiagnostikeinrichtung zur digitalen Radiographie

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2890553B2 (ja) * 1989-11-24 1999-05-17 株式会社島津製作所 Ｘ線像撮像装置
US5012504A (en) * 1989-12-26 1991-04-30 General Electric Company Automatic brightness compensation for fluorography systems
JP2548018Y2 (ja) * 1990-01-24 1997-09-17 興和 株式会社 Ｘ線撮像装置
WO1992000567A1 (en) * 1990-07-02 1992-01-09 Varian Associates, Inc. Computed tomography apparatus using image intensifier detector
EP0480096B1 (de) * 1990-10-12 1994-07-13 Siemens Aktiengesellschaft Röntgendiagnostikanlage mit einem Röntgenbildverstärker und einem Detektor für die Bildhelligkeit auf dessen Ausgangsschirm
DE4102445C1 (enrdf_load_stackoverflow) * 1991-01-28 1992-03-05 Siemens Ag, 8000 Muenchen, De
DE4300829C2 (de) * 1993-01-14 1996-08-29 Siemens Ag Röntgendiagnostikeinrichtung
DE9404768U1 (de) * 1994-03-21 1995-07-20 Siemens AG, 80333 München Röntgendiagnostikgerät mit einer Dosisleistungsregelung
FI941589A7 (fi) * 1994-04-07 1996-01-12 Stig Svensson Laite röntgenkuvien ottamiseksi
EP0746966B1 (en) * 1994-12-23 2003-07-30 Koninklijke Philips Electronics N.V. X-ray examination apparatus comprising an exposure control circuit
US5574764A (en) * 1995-06-06 1996-11-12 General Electric Company Digital brightness detector
US5617462A (en) * 1995-08-07 1997-04-01 Oec Medical Systems, Inc. Automatic X-ray exposure control system and method of use
DE19606873C2 (de) * 1996-02-23 2000-10-12 Siemens Ag Röntgendiagnostikeinrichtung mit einem Festkörperbildwandler
US5751783A (en) * 1996-12-20 1998-05-12 General Electric Company Detector for automatic exposure control on an x-ray imaging system
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
JP2002532837A (ja) * 1998-12-08 2002-10-02 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 対象物の吸収率に依存した輝度制御を含むｘ線検査装置
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 (de) 1999-07-26 2004-02-12 Siemens Ag Röntgendiagnostikeinrichtung mit einem flächenförmigen Röntgenbildwandler mit Rückseitenbeleuchtung
US20060079753A1 (en) * 2004-09-27 2006-04-13 Michael Gurley Pre-acquisition identification of region for image acquisition time optimization for radiation imaging systems

Family Cites Families (10)

* 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
JPS536593A (en) * 1976-07-08 1978-01-21 Toshiba Corp X-ray apparatus for diagnosis
DE2740998A1 (de) * 1977-09-12 1979-03-22 Siemens Ag Roentgendiagnostikeinrichtung fuer durchleuchtung
DE2803913C2 (de) * 1978-01-30 1986-01-30 Siemens AG, 1000 Berlin und 8000 München Röntgendiagnostikanlage mit einer Bildverstärker-Fernsehkette
JPS5773900U (enrdf_load_stackoverflow) * 1980-10-24 1982-05-07
DD158307A1 (de) * 1981-04-23 1983-01-05 Guenther Orth Verfahren zur herstellung von roentgenaufnahmen
JPS5875800A (ja) * 1981-10-30 1983-05-07 Hitachi Medical Corp Ｘ線自動露出装置
DE3225061A1 (de) * 1982-07-05 1984-01-05 Siemens AG, 1000 Berlin und 8000 München Roentgendiagnostikeinrichtung
JPS6116371A (ja) * 1984-07-03 1986-01-24 Toshiba Corp デジタルフルオログラフイ装置
NL8502569A (nl) * 1985-09-20 1987-04-16 Philips Nv Roentgenonderzoekapparaat met een locaal opgedeelde hulpdetector.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004017180B4 (de) * 2004-04-07 2007-08-02 Siemens Ag Röntgendiagnostikeinrichtung zur digitalen Radiographie
US7463718B2 (en) 2004-04-07 2008-12-09 Siemens Aktiengesellschaft X-ray diagnostic device for digital radiography

Also Published As

Publication number Publication date
DE3877960D1 (de) 1993-03-11
JPH087841Y2 (ja) 1996-03-06
EP0362427A1 (de) 1990-04-11
JPH0260375U (enrdf_load_stackoverflow) 1990-05-02
US4982418A (en) 1991-01-01

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