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EP0063644A1 - Procédé de prises de vues radiographiques - Google Patents

Procédé de prises de vues radiographiques Download PDF

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Publication number
EP0063644A1
EP0063644A1 EP81110313A EP81110313A EP0063644A1 EP 0063644 A1 EP0063644 A1 EP 0063644A1 EP 81110313 A EP81110313 A EP 81110313A EP 81110313 A EP81110313 A EP 81110313A EP 0063644 A1 EP0063644 A1 EP 0063644A1
Authority
EP
European Patent Office
Prior art keywords
ray
programmed
tube voltage
dose
exposure
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
EP81110313A
Other languages
German (de)
English (en)
Other versions
EP0063644B1 (fr
Inventor
Günther Orth
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.)
Veb Transformatoren- und Rontgenwerk "hermann Matern"
Transformatoren und Roentgenwerk GmbH
Original Assignee
Veb Transformatoren- und Rontgenwerk "hermann Matern"
Transformatoren und Roentgenwerk GmbH
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=5530508&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0063644(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Veb Transformatoren- und Rontgenwerk "hermann Matern", Transformatoren und Roentgenwerk GmbH filed Critical Veb Transformatoren- und Rontgenwerk "hermann Matern"
Publication of EP0063644A1 publication Critical patent/EP0063644A1/fr
Application granted granted Critical
Publication of EP0063644B1 publication Critical patent/EP0063644B1/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
    • H05G1/46—Combined control of different quantities, e.g. exposure time as well as voltage or current
    • 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

Definitions

  • the invention relates to a method for producing X-ray images with an X-ray diagnostic device, wherein between the object to be photographed or the anti-scatter grid and an X-ray image recording system, e.g. a film cassette, an X-ray shadow-free radiation detector, e.g. an ionization chamber with measuring fields, a dose measuring device and a microprocessor system performing control functions is provided.
  • an X-ray image recording system e.g. a film cassette
  • an X-ray shadow-free radiation detector e.g. an ionization chamber with measuring fields
  • a dose measuring device e.g. an ionization chamber with measuring fields
  • the imaging parameters x-ray tube voltage (kV) and milliampere-seconds product (mAs) or x-ray tube voltage (kV) and x-ray tube current (mA) as well as the exposure time (s) on the adjustment elements provided on the control unit of the x-ray generator are based on empirically determined exposure tables set before the start of the X-ray.
  • the X-ray tube voltage (kV) is selected as the imaging parameter on the X-ray generator before the start of the exposure and the desired blackening is set on the X-ray exposure machine depending on the sensitivity of the exposure material, and, if necessary, a specific measuring field or a measuring field combination of an ionization chamber used as a radiation detector is selected.
  • kV value is made with the help of exposure tables in which the respective organs to be examined are assigned corresponding values in relation to a normal patient.
  • the imaging parameters such as kV values, mAs product, blackening and measuring field or measuring field combination are already programmed and saved in an organ or organ group assignment, so that these parameters can only be activated by one, corresponding to an organ or one Key assigned to the organ group in the X-ray generator and in the exposure machine can be set automatically.
  • further keys in addition to the many organ or organ group keys required for this setting technique, and when pressed, the imaging parameters are corrected according to the patient thickness, as assessed by the X-ray specialist must be made.
  • the programmed recording technology requires X-ray generators equipped with organ or organ groups as well as object adjustment keys or .
  • organ or organ groups as well as object adjustment keys or .
  • their remote control units require a relatively large amount of attention in order to avoid incorrect operation and, on the other hand, the patient to be examined must be assessed in order to adapt the programmed parameters for the individual organs or organ groups based on average values to the respective patient constitution. In this assessment, which is largely subject to subjective influences, essentially only the patient's thickness is found, but not the individually different radiation transparency Be consideration.
  • a method for optimizing x-ray recordings with the aid of an x-ray diagnostic system with x-ray exposure machines is known, the x-ray diagnostic system being equipped with an operating device for setting the imaging parameters in free setting technology or programmed recording technology and a microprocessor system which performs control functions and the x-ray tube monitoring is (DD-PS 143 692),
  • a measuring device is arranged in the beam path of the X-ray diagnostic system directly at the location of the X-ray image recording system or immediately behind it, which indirectly measures the X-ray radiation during test radiation immediately before the actual X-ray exposure.
  • those imaging parameters are selected with which the organ of a normal patient to be examined is recorded.
  • the sensitivity of the X-ray exposure machine must be increased by an order of magnitude in order to keep the additional radiation exposure to which the patient is exposed as low as possible.
  • the measuring device provides a signal which is used to correct the preselection of the X-ray exposure machine so that the subsequent X-ray exposure can be carried out with the optimal darkness setting. This procedure eliminates the need for setting elements for object adjustment on the operating device.
  • a method for producing x-ray images with free or with programmed recording technology, microprocessor system and with x-ray shadow-free ionization chamber with measuring fields, arranged between the patient or scattered radiation grid and x-ray image recording system is known, in which the radiation detector of an x-ray exposure machine for determining the patient-specific properties of the organ to be examined is known used and the The actual x-ray exposure is preceded by test radiation controlled by a timer, the imaging parameters stored in the microprocessor system for normal patients being corrected for the patient after the test radiation, and the x-ray exposure being subsequently carried out using the corrected parameters (DD-PS 144 345).
  • the imaging parameters for a normal patient for example by pressing the organ group key, are set before the X-ray and before the test radiation.
  • the invention is based on the object of specifying a method for producing X-ray images of the most varied human organs with an X-ray diagnostic device which is equipped with an X-ray shadow-free radiation detector of a dose measuring device arranged between the object to be photographed or the anti-scatter grid and the X-ray image recording system, and in which the microprocessor system performing control functions Preparation of optimal X-rays is guaranteed, ie the imaging parameters are adapted to the specific properties of the patient to be examined and, on the other hand, the effort involved in setting imaging parameters before triggering the x-ray is minimized and the patient is not exposed to any additional radiation exposure if possible.
  • This object is achieved according to the invention in that after preselection of the relative hardness value, that is to say the desired image character and, if appropriate, the recording field size of the measuring field or the measuring field combination, and the film and film sensitivity, on setting elements provided for this purpose on the X-ray generator or corresponding operating parts, with triggering of the X-ray image initially
  • the X-ray image until a pre-programmed dose is reached with a pre-programmed constant tube voltage and a pre-program mated, constant tube current and a variable proportional to the measured time which has elapsed until this dose is reached is supplied to the microprocessor system in that stored values are assigned to this variable as a function of the setting variables preselected before the exposure is triggered and the focus-film distance for the tube voltage, the mAs product and the blackening are activated and then the progress of the X-ray recording until it ends by influencing corresponding actuators with these values for the tube voltage and the mAs product and the blackening
  • the advantage achieved by the invention can be seen above all in the fact that the number of control elements or setting elements on the X-ray generator or on the remote control units is drastically reduced, since only the relative hardness value, ie the desired image character and possibly the recording field size, that Measuring field or a measuring field combination as well as the film and foil sensitivity but not the tube voltage and the mAs product are to be selected, i.e. compared to the conventional programmed recording technology, the organ or organ group keys are no longer required in addition to the object adjustment keys.
  • the functional relationship between tube voltage and mAs product known for setting technology based on so-called X-ray light values is used for different object thicknesses or object transparencies with a specific relative hardness value (H. Beger, TuR X-ray generators with the setting technology after X-ray light values, medical technology, H. 5, 1966).
  • the programmed tube voltage is automatically increased to a higher programmed value in order to determine the object transparency during this first recording phase and if necessary, the programmed dose is simultaneously switched to a lower, programmed value if the measured dose after a predetermined limit time is lower than an also programmed dose value assigned to this limit time.
  • the tube current or both sizes instead of the tube voltage. This measure ensures that the duration of the first acquisition phase, in which the object transparency is determined, remains short in relation to the duration of the second acquisition phase with the optimized imaging parameters kV, mAs.
  • an X-ray diagnostic device for producing X-ray images according to the inventive method is shown schematically.
  • the x-ray diagnostic device consists of an x-ray generator 1, an application device 2 with an x-ray emitter 3 and an x-ray image recording system 4, a dose measuring device 5 with an internal device for time measurement and output of time-specific signals, an operating device 6 and a microprocessor system 7 with peripheral digital / analog converters and Input / output units.
  • a three-phase network 8 is used to supply the X-ray diagnostic device.
  • a film cassette with a film / amplifier film combination there is a radiation filter 9, an aperture 10, a e.g. patient 11 fixed on a positioning table, if necessary a scattered radiation grid 12 and an ionization chamber as radiation detector 13.
  • buttons on the operating device 6 is selected in accordance with the selected image character (soft, normal, hard), i.e. the selected relative hardness value H, is actuated.
  • the actuating and switching elements in the X-ray generator 1 which are not shown in detail in the drawing, are controlled via a line 14 in such a way that a predetermined tube voltage U T1 and a predetermined tube current I T1 are set for a first phase of the X-ray exposure.
  • a certain value of the sensitivity is set via a line 15 by means of actuating and switching elements, also not shown in detail, in the dose moss device 5.
  • the ROM (PROM) areas of the microprocessor system 7 are activated with the stored programs for obtaining the manipulated variables for the imaging parameters of a second recording phase, specifically for the tube voltage U and the mAs product Q and the blackening S.
  • the other switching and adjustment processes required for preparing an X-ray image are also started in the X-ray diagnostic device.
  • the X-ray recording is triggered by a circuit breaker 19 which is switched on via a line 20 after a specific delay time with the aid of an internal switching element in the X-ray generator 1.
  • a likewise predetermined dose value D limit measured with the aid of the X-ray shadow-free radiation detector 13 is reached, then the first phase of the x-ray recording with the programmed tube voltage U T1 and the programmed tube current I T1 continues. If a further predetermined dose value D Test 1 is finally reached, the circuit breaker 19 is supplied with a signal by the dose measuring device 5 via a line 21 and the first phase of the x-ray is completed.
  • the circuit breaker 19 first receives a signal via line 21 to interrupt the first recording phase and secondly the corresponding switching or Actuator in the X-ray generator 1 via a line 22 a signal for switching to a higher, also preprogrammed tube voltage U T2 .
  • the relevant ROM (PROM) area in the microprocessor system 7 is simultaneously activated via a line 23, the coding unit 17 and the data input unit 18 in order to obtain the manipulated variables for the imaging parameters of the second recording phase.
  • the internal switch or actuator in the dose measuring device 5 is used to switch to a predetermined higher sensitivity value at this time.
  • a signal proportional to the measured time t which has elapsed until the dose value D 1 is reached or, in the case of automatic tube voltage increase during the first recording phase, until the dose value D 2 is reached, is formed in the dose measuring device 5 and sent to the microprocessor system 7 via a line 24 and a data input unit 25 is supplied.
  • this signal and the stored function U f (t) associated with the tube voltage U T1 or U T2 and the tube current I T in the ROM (PROM) for the respective tube voltage U T1 and the tube current I T become one of the tube voltage U for the second Recording phase proportional signal formed by the microprocessor system 7 is fed via a data output device 26, a digital-to-analog converter 27 and via a line 28 to the actuator for the tube voltage U in the X-ray generator 1.
  • This signal is finally fed via a data output unit 35, a digital / analog converter 36 and a line 37 to an actuator for the blackening S in the dose measuring device 5.
  • This signal is corrected by the density-specific signal, a higher density value S resulting in a larger mAs product Q, and via a data output unit 38 and a digital / analog converter 39 and a line 40 to an actuator for the mAs Product Q fed into the X-ray generator 1,
  • the circuit breaker 19 is switched on again via the line 20 and thus triggered the second phase of the X-ray exposure with the optimized imaging parameters.
  • the two-phase x-ray exposure is finally ended after the dose D, which is measured in the dose measuring device 5 and is optimal for image recording, is ended after the circuit breaker 19 has been supplied with the switch-off signal via the line 21.

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Apparatus For Radiation Diagnosis (AREA)
  • X-Ray Techniques (AREA)
EP19810110313 1981-04-23 1981-12-10 Procédé de prises de vues radiographiques Expired EP0063644B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DD22943381A DD158307A1 (de) 1981-04-23 1981-04-23 Verfahren zur herstellung von roentgenaufnahmen
DD229433 1981-04-23

Publications (2)

Publication Number Publication Date
EP0063644A1 true EP0063644A1 (fr) 1982-11-03
EP0063644B1 EP0063644B1 (fr) 1985-04-10

Family

ID=5530508

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810110313 Expired EP0063644B1 (fr) 1981-04-23 1981-12-10 Procédé de prises de vues radiographiques

Country Status (3)

Country Link
EP (1) EP0063644B1 (fr)
DD (1) DD158307A1 (fr)
DE (1) DE3169905D1 (fr)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0200272A2 (fr) * 1985-04-29 1986-11-05 Koninklijke Philips Electronics N.V. Appareil d'examen à rayons X et procédé de contrôle d'exposition
FR2585917A1 (fr) * 1985-08-02 1987-02-06 Thomson Cgr Procede de reglage d'un dispositif de radiologie
EP0228648A2 (fr) * 1985-12-30 1987-07-15 General Electric Company Contrôle automatique de la brillance d'une image à rayons X
EP0234603A2 (fr) * 1986-01-10 1987-09-02 Philips Patentverwaltung GmbH Générateur de rayons X avec asservissement de la dose d'exposition
US4773087A (en) * 1986-04-14 1988-09-20 University Of Rochester Quality of shadowgraphic x-ray images
US4803714A (en) * 1983-09-13 1989-02-07 B. V. Optische Industrie "De Oude Delft" Method for forming a radiogram using slit-scanning radiographic techniques
EP0325120A1 (fr) * 1988-01-18 1989-07-26 Siemens Aktiengesellschaft Appareil de diagnostic par rayons X
EP0346530A1 (fr) * 1988-06-16 1989-12-20 Nicola Elias Yanaki Procédé et dispositif pour optimiser la qualité radiographique par contrôle de la tension, du courant, de la dimension du foyer et du temps d'exposition d'un tube à rayons X
EP0362427A1 (fr) * 1988-10-05 1990-04-11 Siemens Aktiengesellschaft Installation de radiodiagnostic comportant un détecteur de brillance moyenne d'image
EP0455001A2 (fr) * 1990-04-28 1991-11-06 Klaus-Peter Bork Arrangement de circuit pour des générateurs de rayons X, en particulier en vue d'applications diagnostiques
US5150393A (en) * 1990-09-29 1992-09-22 Siemens Aktiengesellschaft X-ray diagnostics installation for mammography
US5164977A (en) * 1983-09-13 1992-11-17 B.V. Optische Industrie, "De Oude Delft" Process and apparatus for effecting slit radiography
WO1995025990A2 (fr) * 1994-03-21 1995-09-28 Siemens Aktiengesellschaft Systeme de regulation a logique floue, notamment pour reguler la puissance de dosage d'un appareil radiographique de diagnostic
WO1998021625A3 (fr) * 1996-11-10 1998-11-05 Smartlight Limited Film a latitude etendue
US6243440B1 (en) * 1998-04-28 2001-06-05 Shimadzu Corporation Radiographic apparatus
FR2819677A1 (fr) * 2000-12-28 2002-07-19 Ge Med Sys Global Tech Co Llc Reglage et optimisation automatiques de l'exposition en radiographie numerique par rayons x
FR2823970A1 (fr) * 2001-04-30 2002-10-31 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
EP1257155A2 (fr) * 2001-05-07 2002-11-13 Philips Corporate Intellectual Property GmbH Procedé et dispositif d'exposition des radiographies
CN1296009C (zh) * 2002-07-19 2007-01-24 株式会社东芝 X－射线ct设备

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1946036A1 (de) * 1969-09-11 1971-03-18 Mueller C H F Gmbh Roentgenapparat,insbesondere fuer Schichtaufnahmen
FR2247047A1 (fr) * 1973-10-08 1975-05-02 Philips Nv
US3974385A (en) * 1972-12-06 1976-08-10 Siemens Aktiengesellschaft X-ray diagnostic apparatus
FR2315209A1 (fr) * 1975-06-16 1977-01-14 Siemens Ag Installation de radiodiagnostic pour prises de vues cinematographiques
FR2372570A1 (fr) * 1976-11-24 1978-06-23 Philips Nv Generateur utilise pour le radiodiagnostic et muni d'un dispositif pour mesurer le debit de rayonnement
FR2395669A1 (fr) * 1977-06-23 1979-01-19 Gen Electric Systeme de diagnostic pour rayons x programme sur base de l'anatomie
WO1980001420A1 (fr) * 1978-12-27 1980-07-10 Boeing Co Dispositif et procede de verification du temps d'exposition d'un film radiographique
FR2445088A2 (fr) * 1978-12-21 1980-07-18 Siemens Ag Appareil de radiodiagnostic pour la radioscopie et la radiographie

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1946036A1 (de) * 1969-09-11 1971-03-18 Mueller C H F Gmbh Roentgenapparat,insbesondere fuer Schichtaufnahmen
US3974385A (en) * 1972-12-06 1976-08-10 Siemens Aktiengesellschaft X-ray diagnostic apparatus
FR2247047A1 (fr) * 1973-10-08 1975-05-02 Philips Nv
FR2315209A1 (fr) * 1975-06-16 1977-01-14 Siemens Ag Installation de radiodiagnostic pour prises de vues cinematographiques
FR2372570A1 (fr) * 1976-11-24 1978-06-23 Philips Nv Generateur utilise pour le radiodiagnostic et muni d'un dispositif pour mesurer le debit de rayonnement
FR2395669A1 (fr) * 1977-06-23 1979-01-19 Gen Electric Systeme de diagnostic pour rayons x programme sur base de l'anatomie
FR2445088A2 (fr) * 1978-12-21 1980-07-18 Siemens Ag Appareil de radiodiagnostic pour la radioscopie et la radiographie
WO1980001420A1 (fr) * 1978-12-27 1980-07-10 Boeing Co Dispositif et procede de verification du temps d'exposition d'un film radiographique

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5164977A (en) * 1983-09-13 1992-11-17 B.V. Optische Industrie, "De Oude Delft" Process and apparatus for effecting slit radiography
US4803714A (en) * 1983-09-13 1989-02-07 B. V. Optische Industrie "De Oude Delft" Method for forming a radiogram using slit-scanning radiographic techniques
EP0200272A2 (fr) * 1985-04-29 1986-11-05 Koninklijke Philips Electronics N.V. Appareil d'examen à rayons X et procédé de contrôle d'exposition
EP0200272A3 (fr) * 1985-04-29 1989-05-03 Koninklijke Philips Electronics N.V. Appareil d'examen à rayons X et procédé de contrôle d'exposition
US4774720A (en) * 1985-08-02 1988-09-27 Thomson-Cgr Method for adjusting an x-ray device
FR2585917A1 (fr) * 1985-08-02 1987-02-06 Thomson Cgr Procede de reglage d'un dispositif de radiologie
EP0214887A1 (fr) * 1985-08-02 1987-03-18 General Electric Cgr S.A. Procédé de réglage d'un dispositif de radiologie
EP0228648A2 (fr) * 1985-12-30 1987-07-15 General Electric Company Contrôle automatique de la brillance d'une image à rayons X
EP0228648A3 (fr) * 1985-12-30 1990-01-03 General Electric Company Contrôle automatique de la brillance d'une image à rayons X
EP0234603A3 (en) * 1986-01-10 1988-08-17 Philips Patentverwaltung Gmbh X-ray generator with control of dosing power
EP0234603A2 (fr) * 1986-01-10 1987-09-02 Philips Patentverwaltung GmbH Générateur de rayons X avec asservissement de la dose d'exposition
US4773087A (en) * 1986-04-14 1988-09-20 University Of Rochester Quality of shadowgraphic x-ray images
EP0325120A1 (fr) * 1988-01-18 1989-07-26 Siemens Aktiengesellschaft Appareil de diagnostic par rayons X
EP0346530A1 (fr) * 1988-06-16 1989-12-20 Nicola Elias Yanaki Procédé et dispositif pour optimiser la qualité radiographique par contrôle de la tension, du courant, de la dimension du foyer et du temps d'exposition d'un tube à rayons X
US4982418A (en) * 1988-10-05 1991-01-01 Siemens Aktiengesellschaft X-ray diagnostics installation having a mean image brightness detector
EP0362427A1 (fr) * 1988-10-05 1990-04-11 Siemens Aktiengesellschaft Installation de radiodiagnostic comportant un détecteur de brillance moyenne d'image
EP0455001A2 (fr) * 1990-04-28 1991-11-06 Klaus-Peter Bork Arrangement de circuit pour des générateurs de rayons X, en particulier en vue d'applications diagnostiques
EP0455001A3 (en) * 1990-04-28 1992-03-11 Klaus-Peter Bork Circuit arrangement for x-ray generators, especially for diagnostic applications
US5150393A (en) * 1990-09-29 1992-09-22 Siemens Aktiengesellschaft X-ray diagnostics installation for mammography
WO1995025990A2 (fr) * 1994-03-21 1995-09-28 Siemens Aktiengesellschaft Systeme de regulation a logique floue, notamment pour reguler la puissance de dosage d'un appareil radiographique de diagnostic
WO1995025990A3 (fr) * 1994-03-21 1995-11-16 Siemens Ag Systeme de regulation a logique floue, notamment pour reguler la puissance de dosage d'un appareil radiographique de diagnostic
US5845269A (en) * 1994-03-21 1998-12-01 Siemens Aktiengesellschaft Fuzzy control system, particularly for dose rate control in an X-ray diagnostics apparatus
WO1998021625A3 (fr) * 1996-11-10 1998-11-05 Smartlight Limited Film a latitude etendue
US6243440B1 (en) * 1998-04-28 2001-06-05 Shimadzu Corporation Radiographic apparatus
FR2819677A1 (fr) * 2000-12-28 2002-07-19 Ge Med Sys Global Tech Co Llc Reglage et optimisation automatiques de l'exposition en radiographie numerique par rayons x
FR2823970A1 (fr) * 2001-04-30 2002-10-31 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
US6771738B2 (en) 2001-04-30 2004-08-03 Ge Medical Systems Global Technology Company Llc Method and apparatus for obtaining an image by radiography with an anti-scatter grid
EP1257155A2 (fr) * 2001-05-07 2002-11-13 Philips Corporate Intellectual Property GmbH Procedé et dispositif d'exposition des radiographies
EP1257155A3 (fr) * 2001-05-07 2003-11-26 Philips Intellectual Property & Standards GmbH Procedé et dispositif d'exposition des radiographies
US6754307B2 (en) 2001-05-07 2004-06-22 Koninklijke Philips Electronics N.V. Method and device for X-ray exposure control
CN1296009C (zh) * 2002-07-19 2007-01-24 株式会社东芝 X－射线ct设备

Also Published As

Publication number Publication date
DE3169905D1 (en) 1985-05-15
DD158307A1 (de) 1983-01-05
EP0063644B1 (fr) 1985-04-10

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