FR2433927A1 - RADIOGRAPHIC TOMOGRAPHY APPARATUS AND IMAGE RECONSTITUTION METHOD - Google Patents

RADIOGRAPHIC TOMOGRAPHY APPARATUS AND IMAGE RECONSTITUTION METHOD

Info

Publication number
FR2433927A1
FR2433927A1 FR7823764A FR7823764A FR2433927A1 FR 2433927 A1 FR2433927 A1 FR 2433927A1 FR 7823764 A FR7823764 A FR 7823764A FR 7823764 A FR7823764 A FR 7823764A FR 2433927 A1 FR2433927 A1 FR 2433927A1
Authority
FR
France
Prior art keywords
degrees
tomography apparatus
detectors
radiographic tomography
over
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
FR7823764A
Other languages
French (fr)
Other versions
FR2433927B1 (en
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.)
Ohio Nuclear Inc
Original Assignee
Ohio Nuclear Inc
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 Ohio Nuclear Inc filed Critical Ohio Nuclear Inc
Publication of FR2433927A1 publication Critical patent/FR2433927A1/en
Application granted granted Critical
Publication of FR2433927B1 publication Critical patent/FR2433927B1/fr
Granted legal-status Critical Current

Links

Classifications

    • 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
    • A61B6/42—Arrangements for detecting radiation specially adapted for radiation diagnosis
    • A61B6/4275—Arrangements for detecting radiation specially adapted for radiation diagnosis using a detector unit almost surrounding the patient, e.g. more than 180°
    • 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; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T11/00—2D [Two Dimensional] image generation
    • G06T11/003—Reconstruction from projections, e.g. tomography
    • G06T11/006—Inverse problem, transformation from projection-space into object-space, e.g. transform methods, back-projection, algebraic methods
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2211/00—Image generation
    • G06T2211/40—Computed tomography
    • G06T2211/421—Filtered back projection [FBP]

Landscapes

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

Abstract

L'invention concerne les appareils de tomographie. Elle se rapporte à un procédé et un appareil dans lesquels les données ne sont relevées que sur un arc de cercle de 180 degrés . Un faisceau 22 de radiations en éventail est associé à un réseau de détecteurs 12 disposé concentriquement On élimine du traitement les données correspondant à ces trajets décalés de plus de 180 degrés , le balayage ayant lieu pratiquement sur 180 degrés plus l'angle d'éventail. Une fonction de pondération représentative d'une moyenne annule les différences de sensibilité entre les détecteurs. Application aux opérations de tomographie radiographique.The invention relates to tomography apparatus. It relates to a method and apparatus in which data is taken only over an arc of a circle of 180 degrees. A fan beam 22 of radiation is associated with an array of detectors 12 arranged concentrically. The data corresponding to these paths shifted by more than 180 degrees is eliminated from the processing, the scanning taking place almost over 180 degrees plus the fan angle. A weighting function representative of an average cancels out the differences in sensitivity between the detectors. Application to radiographic tomography operations.

FR7823764A 1977-09-30 1978-08-11 RADIOGRAPHIC TOMOGRAPHY APPARATUS AND IMAGE RECONSTITUTION METHOD Granted FR2433927A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US83808477A 1977-09-30 1977-09-30

Publications (2)

Publication Number Publication Date
FR2433927A1 true FR2433927A1 (en) 1980-03-21
FR2433927B1 FR2433927B1 (en) 1984-06-29

Family

ID=25276216

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7823764A Granted FR2433927A1 (en) 1977-09-30 1978-08-11 RADIOGRAPHIC TOMOGRAPHY APPARATUS AND IMAGE RECONSTITUTION METHOD

Country Status (5)

Country Link
JP (1) JPS5466791A (en)
AU (1) AU522916B2 (en)
DE (1) DE2842518A1 (en)
FR (1) FR2433927A1 (en)
GB (1) GB2005514B (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4288695A (en) * 1979-04-13 1981-09-08 Technicare Corporation Computerized tomographic scanner with shaped radiation filter
HU188200B (en) * 1982-09-03 1986-03-28 Medicor Muevek,Hu Convolver
NL8204086A (en) * 1982-10-22 1984-05-16 Philips Nv METHOD AND APPARATUS FOR DETERMINING A RADIATION ATTENUATION DISTRIBUTION IN A SURFACE OF A BODY
EP0109205A3 (en) * 1982-11-15 1985-07-31 Picker International, Inc. Method and apparatus for computed tomography imaging
US4570224A (en) * 1982-11-29 1986-02-11 Elscint, Inc. Combining rebinned and unrebinned parallel ray data with unequal lateral spacing to create tomograph images
JPS6089277A (en) * 1983-10-19 1985-05-20 Yokogawa Hokushin Electric Corp Back projection device
US4590559A (en) * 1983-11-23 1986-05-20 Tokyo Shibaura Denki Kabushiki Kaisha Data disc system for a computed tomography X-ray scanner
JP2011502679A (en) * 2007-11-15 2011-01-27 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 Movable wedge for improved image quality in 3D X-ray images

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3778614A (en) * 1968-08-23 1973-12-11 Emi Ltd Method and apparatus for measuring x- or {65 -radiation absorption or transmission at plural angles and analyzing the data
US3965353A (en) * 1974-12-06 1976-06-22 Albert Macovski Cross-sectional X-ray emission imaging system
NL7702320A (en) * 1976-03-03 1977-09-06 Emi Ltd ROENTGEN PHOTOGRAPHIC DEVICE.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3983398A (en) * 1974-11-29 1976-09-28 The Board Of Trustees Of Leland Stanford Junior University Method and apparatus for X-ray or γ-ray 3-D tomography using a fan beam
GB1537487A (en) * 1975-03-18 1978-12-29 Emi Ltd Radiography
JPS52106698A (en) * 1977-03-03 1977-09-07 Emi Ltd Radiation photograph

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3778614A (en) * 1968-08-23 1973-12-11 Emi Ltd Method and apparatus for measuring x- or {65 -radiation absorption or transmission at plural angles and analyzing the data
US3965353A (en) * 1974-12-06 1976-06-22 Albert Macovski Cross-sectional X-ray emission imaging system
NL7702320A (en) * 1976-03-03 1977-09-06 Emi Ltd ROENTGEN PHOTOGRAPHIC DEVICE.
FR2342707A1 (en) * 1976-03-03 1977-09-30 Emi Ltd AXIAL TOMOGRAPHY DEVICE

Also Published As

Publication number Publication date
FR2433927B1 (en) 1984-06-29
GB2005514B (en) 1982-03-17
GB2005514A (en) 1979-04-19
AU522916B2 (en) 1982-07-01
AU3845378A (en) 1980-01-31
DE2842518A1 (en) 1979-04-05
JPS5466791A (en) 1979-05-29

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Legal Events

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