GB2005514A - Method of and apparatus for examining objects by the use of radiation - Google Patents

Method of and apparatus for examining objects by the use of radiation

Info

Publication number
GB2005514A
GB2005514A GB7838963A GB7838963A GB2005514A GB 2005514 A GB2005514 A GB 2005514A GB 7838963 A GB7838963 A GB 7838963A GB 7838963 A GB7838963 A GB 7838963A GB 2005514 A GB2005514 A GB 2005514A
Authority
GB
United Kingdom
Prior art keywords
data
coordinate system
fan
produce
ray source
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
GB7838963A
Other versions
GB2005514B (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 GB2005514A publication Critical patent/GB2005514A/en
Application granted granted Critical
Publication of GB2005514B publication Critical patent/GB2005514B/en
Expired legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
    • A61B6/42—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for detecting radiation specially adapted for radiation diagnosis
    • A61B6/4275—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with 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 for radiation diagnosis, e.g. combined with radiation therapy equipment
    • A61B6/02—Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
    • A61B6/03—Computerised tomographs
    • 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]

Abstract

A method and apparatus for processing attenuation data to produce a tomographic image requires only that each point within a patient scan circle 20 be viewed from 180 DEG in order to produce a full set of data. Data from views beyond 180 DEG are redundant and do not improve the image quality. Scanning is effected by an X-ray source and detector arrangement in which the X-ray source 16 provides a fan-shaped beam or swath of X-rays and the detectors 12 are arranged about the scan circle 20 for 180 DEG plus approximately the angle 22 of the fan-shaped beam. A back projector 44 back projects data from a polar coordinate system into a rectangular coordinate system in which the matrix points in the rectangular coordinate system can be loaded sequentially with the appropriate density value from a data line expressed in the polar coordinate system. <IMAGE>
GB7838963A 1977-09-30 1978-10-02 Methods of and apparatus for examining objects by the use of radiation Expired GB2005514B (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
GB2005514A true GB2005514A (en) 1979-04-19
GB2005514B GB2005514B (en) 1982-03-17

Family

ID=25276216

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7838963A Expired GB2005514B (en) 1977-09-30 1978-10-02 Methods of and apparatus for examining objects by the use of radiation

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)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0018181A1 (en) * 1979-04-13 1980-10-29 Technicare Corporation Computerized tomographic scanner with shaped radiation filter
EP0109205A2 (en) * 1982-11-15 1984-05-23 Picker International, Inc. Method and apparatus for computed tomography imaging
EP0147055A2 (en) * 1983-11-23 1985-07-03 Kabushiki Kaisha Toshiba A data disc system for a computed tomography X-ray scanner
WO2009063353A2 (en) * 2007-11-15 2009-05-22 Koninklijke Philips Electronics N.V. Movable wedge for improved image quality in 3d x-ray imaging

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1283915A (en) * 1968-08-23 1972-08-02 Emi Ltd A method of and apparatus for examination of a body by radiation such as x or gamma radiation
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
US3965353A (en) * 1974-12-06 1976-06-22 Albert Macovski Cross-sectional X-ray emission imaging system
GB1537487A (en) * 1975-03-18 1978-12-29 Emi Ltd Radiography
GB1571509A (en) * 1976-03-03 1980-07-16 Emi Ltd Radiography
JPS52106698A (en) * 1977-03-03 1977-09-07 Emi Ltd Radiation photograph

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0018181A1 (en) * 1979-04-13 1980-10-29 Technicare Corporation Computerized tomographic scanner with shaped radiation filter
EP0109205A2 (en) * 1982-11-15 1984-05-23 Picker International, Inc. Method and apparatus for computed tomography imaging
EP0109205A3 (en) * 1982-11-15 1985-07-31 Picker International, Inc. Method and apparatus for computed tomography imaging
EP0147055A2 (en) * 1983-11-23 1985-07-03 Kabushiki Kaisha Toshiba A data disc system for a computed tomography X-ray scanner
EP0147055A3 (en) * 1983-11-23 1987-08-26 Kabushiki Kaisha Toshiba A data disc system for a computed tomography x-ray scanner
WO2009063353A2 (en) * 2007-11-15 2009-05-22 Koninklijke Philips Electronics N.V. Movable wedge for improved image quality in 3d x-ray imaging
WO2009063353A3 (en) * 2007-11-15 2009-07-02 Koninkl Philips Electronics Nv Movable wedge for improved image quality in 3d x-ray imaging
US8483363B2 (en) 2007-11-15 2013-07-09 Koninklijke Philips Electronics N.V. Movable wedge for improved image quality in 3D X-ray imaging

Also Published As

Publication number Publication date
FR2433927B1 (en) 1984-06-29
JPS5466791A (en) 1979-05-29
DE2842518A1 (en) 1979-04-05
GB2005514B (en) 1982-03-17
AU3845378A (en) 1980-01-31
AU522916B2 (en) 1982-07-01
FR2433927A1 (en) 1980-03-21

Similar Documents

Publication Publication Date Title
JP2525162B2 (en) X-ray equipment
US4600998A (en) System for the non-destructive testing of the internal structure of objects
US3867634A (en) Body portion support for use with penetrating radiation examination apparatus
US4229651A (en) Radiation scanning method and apparatus
US3924131A (en) Method of and apparatus for examining a body by radiation such as X or gamma radiation
JPH11253442A (en) X-ray diagnostic device having computed tomograph
GB1526765A (en) Method and apparatus for x-ray or ypsilon-ray 3-d tomography using a fan beam
US4984159A (en) Method and apparatus for estimating elliptical body contours in fan beam computed tomographic systems
US4193001A (en) Tomographic apparatus for producing transverse layer images
GB2005514A (en) Method of and apparatus for examining objects by the use of radiation
GB2169180A (en) Ct apparatus and operating method therefor
GB1577615A (en) Radiography
GB2170980A (en) Ct scanner and detector therefor
Kotre et al. A simulator-based CT system for radiotherapy treatment planning
SE8100606L (en) CT
US4206359A (en) Radiography
US4126787A (en) Radiography
Hounsfield Method of an apparatus for examining a body by radiation such as x or gamma radiation
Ning et al. Image-intensifier-based volume tomographic angiography imaging system: geometric distortion correction
US4126785A (en) Radiography
Spencer Computer tomography—an overview
EP0333857B1 (en) Radiation ct
US20230404496A1 (en) Computed tomography apparatus, manufacturing method thereof and operating method thereof
GB1603593A (en) Device for computed tomography
JPS628740A (en) Tomographic examination apparatus

Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee