EP0255017B1 - Röntgendiagnostikgerät für Röntgenaufnahmen - Google Patents

Röntgendiagnostikgerät für Röntgenaufnahmen Download PDF

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Publication number
EP0255017B1
EP0255017B1 EP87110496A EP87110496A EP0255017B1 EP 0255017 B1 EP0255017 B1 EP 0255017B1 EP 87110496 A EP87110496 A EP 87110496A EP 87110496 A EP87110496 A EP 87110496A EP 0255017 B1 EP0255017 B1 EP 0255017B1
Authority
EP
European Patent Office
Prior art keywords
ray
speed
grid
exposure
diagnostic apparatus
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
EP87110496A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0255017A1 (de
Inventor
Ernst Dr. Ammann
Paul Dipl.-Ing. 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 EP0255017A1 publication Critical patent/EP0255017A1/de
Application granted granted Critical
Publication of EP0255017B1 publication Critical patent/EP0255017B1/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
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
    • G21K1/00—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
    • G21K1/02—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators
    • G21K1/025—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators using multiple collimators, e.g. Bucky screens; other devices for eliminating undesired or dispersed radiation
    • 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 device for X-ray recordings with a secondary radiation grid in front of the film recording device, with an actuator for moving the secondary beam grid during a recording perpendicular to the central beam of the X-ray beam and with means for forming an electrical signal corresponding to the recording time.
  • the secondary radiation grid provided with lamellas aligned with the focus of the X-ray emitter serves to suppress the scattered radiation emanating from the object to be photographed.
  • the movement of the secondary beam grid during a recording should prevent the slats from becoming visible in the recording.
  • the known secondary beam grids have a fixed predetermined speed profile of the secondary beam grid. With such a speed profile, however, it cannot be prevented with certainty at all exposure times that raster stripes become visible in the X-ray image.
  • the invention is accordingly based on the object of designing an X-ray diagnostic device of the type mentioned at the outset in such a way that the imaging of the lamellae of the secondary radiation grid in the X-ray image is reliably prevented at all times of exposure.
  • a control device for the speed of movement of the secondary beam grid is provided, to which the signal corresponding to the recording time for determining the speed as a function of the recording time is supplied.
  • the exposure time is determined by an automatic exposure device which has a radiation detector which is arranged in the beam direction after the exposure object and which is used to form the electrical signal corresponding to the exposure time.
  • the radiation detector initially delivers a dose rate signal which is used by integration to switch off the X-ray emitter.
  • the dose rate signal can be used to infer the expected recording time for an exposure.
  • a signal corresponding to the expected recording time can accordingly be used to control the speed profile of the secondary beam grid. The shorter the recording time, the greater the speed of the secondary beam grid must be.
  • an X-ray generator 1 which feeds an X-ray tube 2 and is connected to the network via a line 3.
  • the X-ray beam 4 emitted by the X-ray tube 2 during an X-ray image passes through a recording object 5, then a radiation measuring chamber 6, then a secondary radiation grid 7 and finally strikes an X-ray film 8 in an X-ray film cassette 9.
  • the secondary beam grid 7 is moved perpendicularly to the central beam 10 by a motor 11 during a recording, so that its slats aligned with the focus of the X-ray tube 2 are not imaged on the film 8.
  • the radiation measuring chamber 6 is connected via an amplifier 12 to an integrator 13, which supplies an electrical signal corresponding to the actual value of the radiation dose to a comparator 14.
  • the comparator 14 receives an electrical signal corresponding to the setpoint value of the radiation dose required for optimal film blackening. If the actual and the target value of the radiation dose are the same, the X-ray tube 2 is shadowed by an amplifier 16.
  • the input signal of the integrator 13, the current i, is proportional to the dose rate D. This signal ultimately also determines the recording time. It effects control of the supply via an amplifier 17 and a control device 18. positioning speed X R of the secondary beam grid 7. The shorter the exposure time to be expected, the greater the positioning speed X R.
  • X R the speed of the secondary ray grid. This speed can be determined according to the following relationship:
  • the dose rate can be constant during the recording time or a function of the time t. Accordingly, X R is constant or a function of time t.
  • a path X R is defined, which is the secondary beam lenraster 7 must at least cover during an x-ray.
  • half of the path X R is placed on both sides of the central beam 10.
  • a control circuit for this speed can also be present, in which the setpoint is determined as a function of the expected recording time.

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • X-Ray Techniques (AREA)
  • Apparatus For Radiation Diagnosis (AREA)
  • Radiography Using Non-Light Waves (AREA)
EP87110496A 1986-07-31 1987-07-20 Röntgendiagnostikgerät für Röntgenaufnahmen Expired - Lifetime EP0255017B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3625856 1986-07-31
DE3625856 1986-07-31

Publications (2)

Publication Number Publication Date
EP0255017A1 EP0255017A1 (de) 1988-02-03
EP0255017B1 true EP0255017B1 (de) 1990-06-27

Family

ID=6306359

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87110496A Expired - Lifetime EP0255017B1 (de) 1986-07-31 1987-07-20 Röntgendiagnostikgerät für Röntgenaufnahmen

Country Status (4)

Country Link
US (1) US4803716A (enrdf_load_stackoverflow)
EP (1) EP0255017B1 (enrdf_load_stackoverflow)
JP (1) JPS63157742U (enrdf_load_stackoverflow)
DE (1) DE3763469D1 (enrdf_load_stackoverflow)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5040202A (en) * 1989-06-05 1991-08-13 General Electric Method and apparatus for reducing x-ray grid images
US4969174A (en) * 1989-09-06 1990-11-06 General Electric Company Scanning mammography system with reduced scatter radiation
US4998270A (en) * 1989-09-06 1991-03-05 General Electric Company Mammographic apparatus with collimated controllable X-ray intensity and plurality filters
FI85775C (fi) * 1990-11-22 1992-05-25 Planmed Oy Foerfarande och anordning vid roentgenteknik.
US5379335A (en) * 1993-08-09 1995-01-03 Picker International, Inc. Automatic grid oscillation control for radiographic imaging systems
JPH10305030A (ja) * 1997-03-06 1998-11-17 Canon Inc 放射線撮像装置及び放射線撮像装置の駆動方法
FR2784569B1 (fr) * 1998-10-15 2001-02-16 Ge Medical Syst Sa Procede d'amelioration de la qualite d'une image radiographique d'un objet obtenue par un appareil de radiographie equipe d'une grille antidiffusion
US6181773B1 (en) 1999-03-08 2001-01-30 Direct Radiography Corp. Single-stroke radiation anti-scatter device for x-ray exposure window
JP4557357B2 (ja) * 2000-03-31 2010-10-06 キヤノン株式会社 撮影制御装置、撮影制御方法及び記憶媒体
US6795528B2 (en) * 2001-01-12 2004-09-21 Canon Kabushiki Kaisha Radiographic apparatus, radiographic method, and computer-readable storage medium
FR2823970B1 (fr) * 2001-04-30 2003-11-28 Ge Med Sys Global Tech Co Llc Procede d'amelioration de l'image d'un objet obtenue a partir d'un appareil de radiographie muni d'une grille anti diffusion et dispositif de mise en oeuvre
JP4695795B2 (ja) * 2001-09-21 2011-06-08 キヤノン株式会社 撮像装置及び撮像方法
DE102004017180B4 (de) * 2004-04-07 2007-08-02 Siemens Ag Röntgendiagnostikeinrichtung zur digitalen Radiographie
US7672428B1 (en) * 2006-05-17 2010-03-02 Elekta Ab (Publ) Radiotherapy apparatus
JP2010012030A (ja) * 2008-07-03 2010-01-21 Fujifilm Corp 放射線画像撮影装置
JP2010012024A (ja) * 2008-07-03 2010-01-21 Fujifilm Corp 放射線画像撮影装置
DE102011080279A1 (de) * 2011-08-02 2013-02-07 Siemens Aktiengesellschaft Verfahren und Vorrichtung zum Einsatz eines Streustrahlenrasters bei der periodischen Aufnahme von Röntgenbildern
CN105379426B (zh) * 2013-07-31 2018-04-20 株式会社日立制作所 X射线ct装置、x射线高电压装置、以及x射线摄影装置
WO2018214027A1 (en) * 2017-05-23 2018-11-29 Shanghai United Imaging Healthcare Co., Ltd. Systems and methods for x-ray imaging

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2733613A1 (de) * 1977-07-26 1979-02-08 Philips Patentverwaltung Vorrichtung zum antrieb eines streustrahlenrasters

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE884148C (de) * 1942-01-17 1953-07-23 Siemens Reiniger Werke Ag Sekundaerstrahlenblende fuer die Untersuchung mit Roentgenstrahlen
DE956013C (de) * 1952-07-27 1957-01-10 Siemens Reiniger Werke Ag Roentgengeraet mit einer ohne Unterbrechung hin- und herbewegten Streustrahlenblende
JPS5213190U (enrdf_load_stackoverflow) * 1975-07-14 1977-01-29
US4096391A (en) * 1976-10-15 1978-06-20 The Board Of Trustees Of The University Of Alabama Method and apparatus for reduction of scatter in diagnostic radiology
US4250103A (en) * 1978-12-27 1981-02-10 The Boeing Company Radiographic apparatus and method for monitoring film exposure time
JPS58152543A (ja) * 1982-03-09 1983-09-10 株式会社東芝 Ｘ線撮影装置
FR2526575A1 (fr) * 1982-05-04 1983-11-10 Thomson Csf Procede de traitement d'image radiologique en vue de corriger ladite image des defauts dus au rayonnement diffuse
DE3316003A1 (de) * 1983-05-03 1984-11-08 Philips Patentverwaltung Gmbh, 2000 Hamburg Vorrichtung zur beseitigung von streustrahlung
JPS60181638A (ja) * 1984-02-29 1985-09-17 Toshiba Corp 放射線像撮影装置

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2733613A1 (de) * 1977-07-26 1979-02-08 Philips Patentverwaltung Vorrichtung zum antrieb eines streustrahlenrasters

Also Published As

Publication number Publication date
EP0255017A1 (de) 1988-02-03
JPS63157742U (enrdf_load_stackoverflow) 1988-10-17
DE3763469D1 (de) 1990-08-02
US4803716A (en) 1989-02-07

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