EP0047780A1 - Tomographie transversale avec filtrage optique - Google Patents
Tomographie transversale avec filtrage optiqueInfo
- Publication number
- EP0047780A1 EP0047780A1 EP81900904A EP81900904A EP0047780A1 EP 0047780 A1 EP0047780 A1 EP 0047780A1 EP 81900904 A EP81900904 A EP 81900904A EP 81900904 A EP81900904 A EP 81900904A EP 0047780 A1 EP0047780 A1 EP 0047780A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- optical
- filtering
- light
- beams
- slice
- 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- Withdrawn
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 83
- 238000001914 filtration Methods 0.000 title claims abstract description 65
- 238000003325 tomography Methods 0.000 title abstract description 9
- 230000010287 polarization Effects 0.000 claims description 31
- 230000001360 synchronised effect Effects 0.000 claims description 13
- 230000007480 spreading Effects 0.000 claims description 3
- 230000006870 function Effects 0.000 abstract description 68
- 238000000034 method Methods 0.000 abstract description 52
- 238000001514 detection method Methods 0.000 abstract description 2
- 210000001747 pupil Anatomy 0.000 description 31
- 230000000694 effects Effects 0.000 description 9
- 238000012545 processing Methods 0.000 description 9
- 238000003384 imaging method Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 238000002834 transmittance Methods 0.000 description 5
- 229910021532 Calcite Inorganic materials 0.000 description 4
- 238000013459 approach Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 239000004973 liquid crystal related substance Substances 0.000 description 3
- 230000003362 replicative effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 210000000988 bone and bone Anatomy 0.000 description 2
- 230000014509 gene expression Effects 0.000 description 2
- 230000010363 phase shift Effects 0.000 description 2
- 239000012780 transparent material Substances 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000002591 computed tomography Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010252 digital analysis Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000002601 radiography Methods 0.000 description 1
- 238000001454 recorded image Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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
- A61B6/02—Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/03—Computed tomography [CT]
- A61B6/032—Transmission computed tomography [CT]
-
- 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
- A61B6/52—Devices using data or image processing specially adapted for radiation diagnosis
- A61B6/5205—Devices using data or image processing specially adapted for radiation diagnosis involving processing of raw data to produce diagnostic data
-
- 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
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/30—Transforming light or analogous information into electric information
- H04N5/32—Transforming X-rays
-
- 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]
Definitions
- the present invention is directed to an apparatus and method for generating a two-dimensional back- projected image of a slice of an object, and also to an optical filtering apparatus and method which, inter alia, is useful therein.
- means are provided for generating successive beams of light, each having a narrow elongated cross-section with an optical intensity that is a function of the density characteris ⁇ tic of the slice of the object as measured at a particu ⁇ lar relative rotational angle.
- the beams may be generated, for example, by successively illuminating individual one-dimensional optical projections, each having ai optical characteristic that is a function of the density characteristic of the slice of the object as measured at a' particular relative rotational angle.
- Electro- optical sensing means which may be, for example, a television camera or a photo-detector (depending upon the type of system in which this form of the invention is employed) , are provided to receive the filtered beam. Further means are provided for combining suc- cessive electronic outputs of the electro-optical sensing means. Finally, means synchronized with the interposing means are provided for controlling the polarity of the combining means.
- the first and second optical filtering means are electro-optically switch- able, and the interposing means includes means for controlling the electro-optical switching of the filtering means.
- passing through a particular row of ele- ments is designated by I with two subscripts, the first subscript indicating the reference angle at which the X-ray energy is passed through the slice 90 (a 0° refer ⁇ ence angle is shown in FIG. 5, so the first subscript is 0) , and the second subscript indicating the relative position of the particular beam or beam portion along the one-dimensional data coordinate (e.g. the x axis in FIGS 1 and 2) .
- the detected beams, or portions thereof, which have passed through the slice 90 are designated by primed versions of the input beams. Each output is equal to its corresponding input times a function of the elemental densities through which the beam or beam portion has passed.
- filtering can be used in conjunction with back-projection.
- the fil- tering can be visualized as a type of selective
- h__ (x) is a sampled version of h_ (x) is not surprising since sampling a function in the space domain corresponds to replicating that function in the frequency domain.
- the pupil function that led to h x) was a replicated version of the pupil function for _' (x) .
- the corresponding optical transfer functions which are the autocorrelations of the pupil functions, bear a similar replicative relationship.
- filter means 160 includes a polarizer 161 which polarizes the received beam of unpolarized light in a given direction, for example, to produce vertically polarized light.
- the element 162 is an electro-optical polarization rotator that is operative, when activated by a given polarity of
Landscapes
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Medical Informatics (AREA)
- General Physics & Mathematics (AREA)
- Molecular Biology (AREA)
- Radiology & Medical Imaging (AREA)
- Veterinary Medicine (AREA)
- Public Health (AREA)
- General Health & Medical Sciences (AREA)
- Biophysics (AREA)
- High Energy & Nuclear Physics (AREA)
- Animal Behavior & Ethology (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Optics & Photonics (AREA)
- Pathology (AREA)
- Surgery (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Algebra (AREA)
- Pure & Applied Mathematics (AREA)
- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- Mathematical Physics (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Pulmonology (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Image Processing (AREA)
Abstract
Dispositif et procede pour generer une image bidimensionnelle retroprojetee d'une tranche d'un objet, et dispositif et procede de filtrage optique utiles entre autres dans le procede de tomographie decrit. Des rayons de lumiere successifs sont generes, chacun possedant une section transversale etroite et allongee avec une intensite optique qui est fonction de la caracteristique de densite de la tranche de l'objet mesuree selon un angle de rotation relatif particulier. Les rayons sont filtres optiquement et diffuses dans une direction transversale par rapport a leur longueur. Un filtrage optique avec une fonction de filtre possedant des composants positifs et negatifs est executee de preference en utilisant une technique modulee dans le temps a canal simple. Une camera de television (280) recoit les rayons filtres diffuses. Une rotation relative est effectuee entre les rayons et la camera, la rotation etant fonction des angles de rotation relatifs de l'objet associe a la generation des rayons de lumiere successifs. Une memoire de sequence digitale (287) accumule les intensites detectees dans des zones elementaires des moyens de detection de l'image. Les intensites accumulees comprennent une image retroprojetee bidimensionnelle de la tranche de l'objet pouvant etre ensuite affichee sur un ecran de television (290). Dans une autre forme de la realisation, les images retroprojetees sont obtenues a l'aide d'un processeur de "boucles" optiques (140) utilisant une technique de filtrage modulee dans le temps a canal simple.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/132,562 US4331877A (en) | 1980-03-21 | 1980-03-21 | Transverse tomography with optical filtering |
| US132562 | 1980-03-21 | ||
| US06/132,563 US4329588A (en) | 1980-03-21 | 1980-03-21 | Polarization switched optical filtering for transverse tomography |
| US132563 | 1998-08-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0047780A1 true EP0047780A1 (fr) | 1982-03-24 |
Family
ID=26830496
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP81900904A Withdrawn EP0047780A1 (fr) | 1980-03-21 | 1981-03-16 | Tomographie transversale avec filtrage optique |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0047780A1 (fr) |
| WO (1) | WO1981002800A1 (fr) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2024475A1 (fr) * | 1989-11-27 | 1991-05-28 | Leopold Neumann | Systeme et methode de saisie et de transmission de donnees d'imagerie |
| EP0614645A4 (fr) * | 1992-08-31 | 1996-04-03 | Hitachi Ltd | Appareil de tomographie optique informatisee. |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE693374C (de) * | 1938-06-27 | 1940-07-12 | C H F Mueller Akt Ges | Verfahren zur Herstellung von Koerperschnittbildern mittels Roentgenstrahlen |
| US3027806A (en) * | 1957-03-14 | 1962-04-03 | Ibm | Electro-optical devices |
| US4081673A (en) * | 1976-04-12 | 1978-03-28 | University Patents, Inc. | Transverse tomography apparatus and method |
| US4023036A (en) * | 1975-06-16 | 1977-05-10 | University Patents, Inc. | Apparatus and method for transverse tomography |
| NL7605254A (nl) * | 1976-05-17 | 1977-11-21 | Optische Ind De Oude Delft Nv | Beeldconstructie. |
| NL7609963A (nl) * | 1976-09-08 | 1978-03-10 | Optische Ind De Oude Delft Nv | Signaalverwerkend stelsel. |
| US4135096A (en) * | 1977-11-23 | 1979-01-16 | Giordano Ames F | Electronic-optical system for X-ray object cross section image reconstruction |
| NL7804881A (nl) * | 1978-05-05 | 1979-11-07 | Optische Ind De Oude Delft Nv | Werkwijze en inrichting voor het elektro-optisch convo- lueren van een eendimensionaal signaal. |
-
1981
- 1981-03-16 WO PCT/US1981/000318 patent/WO1981002800A1/fr unknown
- 1981-03-16 EP EP81900904A patent/EP0047780A1/fr not_active Withdrawn
Non-Patent Citations (1)
| Title |
|---|
| See references of WO8102800A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO1981002800A1 (fr) | 1981-10-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Designated state(s): CH DE FR GB LU NL SE |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 19820524 |
|
| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: BARRET, HARRISON H. Inventor name: GORDON, SCOTT Inventor name: GREIVENKAMP, JOHN E., JR. Inventor name: SWINDELL, WILLIAM |