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FR2368760A1 - METHOD AND DEVICE FOR REDUCING THE INFLUENCE OF DETECTION ERRORS WHEN USING X-RAY EXAMINATION DEVICES - Google Patents

METHOD AND DEVICE FOR REDUCING THE INFLUENCE OF DETECTION ERRORS WHEN USING X-RAY EXAMINATION DEVICES

Info

Publication number
FR2368760A1
FR2368760A1 FR7731903A FR7731903A FR2368760A1 FR 2368760 A1 FR2368760 A1 FR 2368760A1 FR 7731903 A FR7731903 A FR 7731903A FR 7731903 A FR7731903 A FR 7731903A FR 2368760 A1 FR2368760 A1 FR 2368760A1
Authority
FR
France
Prior art keywords
memory
supplied
influence
reducing
ray examination
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.)
Withdrawn
Application number
FR7731903A
Other languages
French (fr)
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of FR2368760A1 publication Critical patent/FR2368760A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G06T12/10—
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/02—Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
    • A61B6/03—Computed tomography [CT]
    • A61B6/032—Transmission computed tomography [CT]
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T1/00—General purpose image data processing
    • G06T1/0007—Image acquisition

Landscapes

  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Medical Informatics (AREA)
  • Pathology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Pulmonology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Radiology & Medical Imaging (AREA)
  • Biomedical Technology (AREA)
  • Biophysics (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Apparatus For Radiation Diagnosis (AREA)
  • Image Processing (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)

Abstract

Procédé qui permet de réduire l'influence d'erreurs de détection lors de l'emploi de dispositifs d'examen par rayons X et suivant lequel le rayonnement diaphragmé de façon à devenir divergent, traverse le plan d'un corps à examiner et est mesuré par plusieurs détecteurs placés suivant un arc de cercle dans ledit plan l'ensemble source-détecteurs étant tourné par rapport au corps pour le soumettre au rayonnement dans différentes directions de mesure, les signaux de sortie appartenant à une direction de mesure déterminée, réunis de façon à former un jeu d'éléments d'information et fournis par le groupe de détecteurs, sont emmagasinés dans une première mémoire. Pour chaque détecteur le dispositif forme la valeur moyenne des signaux de sortie, ensuite les valeurs moyennes formées de la sorte sont fournies à un circuit de calcul en vue d'être soumises à un filtrage passe-haut, les valeurs filtrées étant ensuite emmagasinées dans une deuxième mémoire, après quoi le contenu de la première mémoire et le contenu de la deuxième mémoire sont fournis à un circuit de soustraction. Application à la tomographie.A method of reducing the influence of detection errors in the use of x-ray examination devices and whereby radiation diaphragm so as to become divergent passes through the plane of a body to be examined and is measured by several detectors placed in an arc of a circle in said plane, the source-detector assembly being rotated relative to the body to subject it to radiation in different measurement directions, the output signals belonging to a determined measurement direction, brought together in such a way to form a set of information elements and supplied by the group of detectors, are stored in a first memory. For each detector the device forms the average value of the output signals, then the average values formed in this way are supplied to a calculation circuit with a view to being subjected to a high pass filtering, the filtered values then being stored in a second memory, after which the contents of the first memory and the contents of the second memory are supplied to a subtraction circuit. Application to tomography.

FR7731903A 1976-10-23 1977-10-24 METHOD AND DEVICE FOR REDUCING THE INFLUENCE OF DETECTION ERRORS WHEN USING X-RAY EXAMINATION DEVICES Withdrawn FR2368760A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19762648132 DE2648132A1 (en) 1976-10-23 1976-10-23 PROCEDURE AND ARRANGEMENT TO REDUCE THE INFLUENCE OF DETECTOR FAULTS IN ROENTGEN SCANNERS

Publications (1)

Publication Number Publication Date
FR2368760A1 true FR2368760A1 (en) 1978-05-19

Family

ID=5991278

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7731903A Withdrawn FR2368760A1 (en) 1976-10-23 1977-10-24 METHOD AND DEVICE FOR REDUCING THE INFLUENCE OF DETECTION ERRORS WHEN USING X-RAY EXAMINATION DEVICES

Country Status (6)

Country Link
JP (1) JPS5368091A (en)
DE (1) DE2648132A1 (en)
FR (1) FR2368760A1 (en)
IL (1) IL53175A0 (en)
NL (1) NL7711391A (en)
SE (1) SE7711798L (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2411420A1 (en) * 1977-12-07 1979-07-06 Philips Nv METHOD AND DEVICE FOR REDUCING THE IMPORTANCE OF ERRORS IN FORMED TOMOGRAPHIC IMAGES USING A CALCULATOR
EP0366529A1 (en) * 1988-10-28 1990-05-02 General Electric Cgr S.A. Method and system for suppressing interferences in an X-ray scanner
EP0366528A1 (en) * 1988-10-28 1990-05-02 General Electric Cgr S.A. Method and device for calibrating an X-ray scanner by means of at least one phantom
US5225979A (en) * 1988-10-28 1993-07-06 General Electric Cgt Sa Method and system for calibrating an x-ray scanner from the image of at least one calibration standard

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2964915D1 (en) * 1978-10-24 1983-03-31 Emi Ltd Computerized tomographic apparatus
US4250387A (en) * 1979-10-12 1981-02-10 Emi Limited Medical radiographic apparatus and method
JPS6048731A (en) * 1983-08-29 1985-03-16 株式会社日立メディコ X-ray tomographic apparatus
JP3092127B2 (en) * 1989-09-08 2000-09-25 株式会社日立メディコ X-ray CT system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2260252A1 (en) * 1974-01-31 1975-08-29 Emi Ltd
FR2333253A1 (en) * 1975-11-25 1977-06-24 Philips Med Syst Inc METHOD AND DEVICE FOR PRACTICE TOMOGRAPHY USING A COMPUTER
FR2345733A1 (en) * 1976-03-26 1977-10-21 Siemens Ag TOMOGRAPHY DEVICE TO MAKE TRANSVERSAL TOMOGRAPHS

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2260252A1 (en) * 1974-01-31 1975-08-29 Emi Ltd
FR2333253A1 (en) * 1975-11-25 1977-06-24 Philips Med Syst Inc METHOD AND DEVICE FOR PRACTICE TOMOGRAPHY USING A COMPUTER
FR2345733A1 (en) * 1976-03-26 1977-10-21 Siemens Ag TOMOGRAPHY DEVICE TO MAKE TRANSVERSAL TOMOGRAPHS

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2411420A1 (en) * 1977-12-07 1979-07-06 Philips Nv METHOD AND DEVICE FOR REDUCING THE IMPORTANCE OF ERRORS IN FORMED TOMOGRAPHIC IMAGES USING A CALCULATOR
EP0366529A1 (en) * 1988-10-28 1990-05-02 General Electric Cgr S.A. Method and system for suppressing interferences in an X-ray scanner
EP0366528A1 (en) * 1988-10-28 1990-05-02 General Electric Cgr S.A. Method and device for calibrating an X-ray scanner by means of at least one phantom
FR2638535A1 (en) * 1988-10-28 1990-05-04 Gen Electric Cgr METHOD AND SYSTEM FOR CALIBRATING AN X-RAY SCANNER FROM THE IMAGE OF AT LEAST ONE STANDARD
FR2638534A1 (en) * 1988-10-28 1990-05-04 Gen Electric Cgr METHOD AND SYSTEM FOR ELIMINATING INTERFERENCE NOISE IN AN X-RAY SCANNER
US5216600A (en) * 1988-10-28 1993-06-01 General Electric Cgr Sa Method for eliminating parasitic noise in an x-ray scanner
US5225979A (en) * 1988-10-28 1993-07-06 General Electric Cgt Sa Method and system for calibrating an x-ray scanner from the image of at least one calibration standard

Also Published As

Publication number Publication date
SE7711798L (en) 1978-04-24
IL53175A0 (en) 1977-12-30
JPS5368091A (en) 1978-06-17
DE2648132A1 (en) 1978-04-27
NL7711391A (en) 1978-04-25

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Legal Events

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