EP0981766B1 - Procede dispositif pour la lecture et le traitement d'une image radiologique - Google Patents

Procede dispositif pour la lecture et le traitement d'une image radiologique Download PDF

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Publication number
EP0981766B1
EP0981766B1 EP98925555A EP98925555A EP0981766B1 EP 0981766 B1 EP0981766 B1 EP 0981766B1 EP 98925555 A EP98925555 A EP 98925555A EP 98925555 A EP98925555 A EP 98925555A EP 0981766 B1 EP0981766 B1 EP 0981766B1
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EP
European Patent Office
Prior art keywords
image
matrix
correction
correction matrix
process according
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Expired - Lifetime
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EP98925555A
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German (de)
English (en)
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EP0981766A1 (fr
Inventor
Christof Steiner
Rainer Ochs
Christoph Burmester
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
    • H01J31/58—Tubes for storage of image or information pattern or for conversion of definition of television or like images, i.e. having electrical input and electrical output
    • H01J31/60—Tubes for storage of image or information pattern or for conversion of definition of television or like images, i.e. having electrical input and electrical output having means for deflecting, either selectively or sequentially, an electron ray on to separate surface elements of the screen
    • H01J31/62—Tubes for storage of image or information pattern or for conversion of definition of television or like images, i.e. having electrical input and electrical output having means for deflecting, either selectively or sequentially, an electron ray on to separate surface elements of the screen with separate reading and writing rays

Definitions

  • the invention relates to a method and an arrangement for Reading and processing of on an erasable image carrier, especially one with a crystalline storage substance coated image plate, individually recorded radiation images 13 according to the preamble of claim 1.
  • the image plates used which are also called phosphor storage disks, in the beam path of a recording device, in particular one Electron microscope or x-ray apparatus, by high-energy Radiation "exposed".
  • the one in the crystalline storage layer radiation image information stored latently on the image plate is then usually in a separate Readout device by scanning the image storage area under Luminescence excitation queried with spatial resolution, the Image information is deleted by reading and the Image plate can thus be used again for image acquisition.
  • Such optical discs have a large dynamic range, however, the picture quality is affected by various Noise sources impaired. With low radiation the noise due to the statistically incident photons generated by the signal itself. At higher photon flows on the other hand, those that are linearly dependent on the irradiance dominate Noise terms caused by manufacturing-related inhomogeneities originate in the storage layer of the optical disc and close lead to a location-dependent sensitivity.
  • the invention is based on the object a method and an arrangement of the type mentioned to improve that the image quality of the read Radiation picture especially with stronger radiation is increased.
  • the main idea of the invention lies in the read out Image matrix by a corresponding to the geometric relationship of the location - dependent noise sources ordered scheme of digital correction values arithmetically with regard to their signal / noise ratio to improve.
  • a correction value for each pixel as an element of a correction matrix to compensate for Inhomogeneities in the image storage area are determined to be the correction matrix in a storage means to the image carrier is assigned, and that the image matrix from below radiation images read out from the image carrier according to requirements the correction matrix is corrected pixel by pixel.
  • the correction values determined only once for any image recordings become.
  • the deviation of the fixing position of the image carrier from determined a target position in the readout device, so that the image matrix and the correction matrix assigned to the image carrier mapped to each other while compensating for the positional deviation can be.
  • the actual positions by at least two on the image carrier at a distance markings arranged from one another in the scanning device recorded and with determination of the position deviation with predetermined Target positions are compared.
  • the actual positions the markings can be made optically by means of the scanning beam detected and in the scanning coordinates of the scanning device be determined.
  • the elements of the Image and correction matrix by transforming the scanning coordinates, in particular a parallel shift and / or a rotation, mapping congruently to each other.
  • the correction matrix is made up of at least one by homogeneous Irradiation of the image storage area obtained correction image determined.
  • the correction values of the Correction matrix from the ratio of the medium intensity and determine the pixel intensity of the correction image.
  • image inhomogeneities by multiplying the elements the image matrix with the rows and columns assigned Elements of the correction matrix can be compensated.
  • the correction matrix and image matrix by interpolation in their line and / or the number of columns can be adapted to one another.
  • the correction matrix can be used to reduce the memory requirement as a curve network in the form of functional relationships to save.
  • the correction matrix is advantageously stored in a memory deposited directly or indirectly. It can the assignment to the image carrier used according to one arranged the image carrier, in particular by a Bar code formed coding take place.
  • the arrangement essentially consists of a readout device 10 and a processing device 12.
  • the reading device 10 includes one by means of motor 14 around it Longitudinal axis rotatable scanning roller 16 and a motor spindle drive 18 in the direction of the longitudinal axis of the scanning roller 16 movable scanning head 20, on which a laser 22 and a Photomultiplier 24 are arranged.
  • the processing facility 12 has one on the input side with the photomultiplier 24 connected signal amplifier 26, one with the output signals of the signal amplifier to which analog / digital converter can be applied 28 and one of the analog / digital converter downstream, coupled with a storage means 30 Image processing computer 32.
  • An image plate 34 serves to record a radiation image, which is generated by high-energy radiation, for example from an X-ray device, not shown, and is latently stored in the irradiated image storage area 36 of the image plate 34.
  • the flexible image plate is fixed on the outer surface 38 of the scanning roller 16 and optically scanned.
  • the scanning beam 40 of the laser 22 directed against the lateral surface 38 is guided over the image storage surface 26 in a scanning movement while rotating the scanning roller 16 and advancing the scanning head 20.
  • the scanning beam 40 stimulates a luminescence emission at the currently scanned pixel 42 on the image memory area 36, the intensity of which depends on the stored image information.
  • the emitted luminescent light 44 is detected by the photomultiplier 24 via an upstream optical system 46 and passed on to the processing unit 12 as a useful signal. Continuous digitization of the useful signal in the analog / digital converter 28 thus results in the course of the scanning movement in a raster-like digital image matrix B, the elements b ij of which are initially in scanning coordinates ⁇ , z over the respective angular position ⁇ of the scanning roller 16 and feed position z of the scanning head 20 can be detected.
  • the stored image information is "erased" by the luminescence emission, and the image carrier 34 can be reused to record a radiation image again.
  • the image matrix B is processed arithmetically.
  • the correction data are obtained by recording at least one correction image initially before the image carrier 34 is actually used.
  • the image storage area 36 is irradiated homogeneously and the correction image thus obtained is read out.
  • correction values c ij can then be obtained as an element of a correction matrix C:
  • the row and column indices i, j refer to the scanned coordinate grid of the scanning coordinates ⁇ , z.
  • the problem arises that the pixels 42 of the image memory area 36 to be superimposed have different scanning coordinates ⁇ , z, provided that a congruent fixation of the image carrier 34 during the readout process is not always guaranteed.
  • the individual matrices C k are mapped congruently on one another in accordance with the respective fixing position of the image carrier 34, so that correction values (c ij ) k with the same indices i, j, are also assigned to the same pixel 42.
  • the detection of the fixing position when reading out a correction image is carried out by scanning the actual positions of fluorescent markings 48 which are spaced apart on the image carrier 34 by means of the scanning device 10.
  • the matrices C k then correspond to one another in accordance with the differences between the actual positions and predetermined target positions superimposed congruently.
  • a simple coordinate transformation of the scanning coordinate grid in particular a parallel displacement and / or a rotation, is sufficient for this. If necessary, stretching or compressing the coordinate grid can also take into account possible distortion of the image carrier 34 clamped on the scanning roller 16.
  • correction characteristics can be recorded for each pixel, from which the correction matrix for a given parameter value can be interpolated if necessary is determined.
  • the possibly averaged correction matrix or the correction values of the characteristic points are stored as a data record in the storage means 32 in association with the image carrier 34.
  • each image carrier 34 has a coding 50 which is expediently embodied as a bar code and can be read out in the scanning device 10.
  • the correction matrix it is fundamentally possible for the correction matrix to be stored as a curve network in the form of functional relationships, in particular coefficients of polynomials, from which the individual correction values c ij can be recovered. It is also conceivable that the correction matrix is stored with a lower resolution than the image matrix B, the missing intermediate points being able to be determined by interpolation.
  • the stored correction data set or the correction matrix C derived therefrom With the stored correction data set or the correction matrix C derived therefrom, imaging or transmission errors due to image inhomogeneities in the image matrix B of radiation images subsequently recorded can be eliminated by calculation. For this too, it must first be ensured that the elements b ij , c ij of the image and correction matrix are each assigned the same pixel 42 with the same indices.
  • the deviation of the fixing position of the image carrier 34 from a target image position in the readout device 10 is determined in the manner described above in connection with the formation of the correction mean, and the image and correction matrix are mapped to one another point by point by means of a suitable transformation.
  • the image matrix B is multiplied by multiplying its elements b ij by the correction values c ij of the correction matrix C obtained according to equation (1), so as to produce an improved radiation image receive.
  • the invention relates to a method and an arrangement for reading and Processing of on an erasable image carrier 34, in particular one coated with a crystalline storage substance Image plate, individually recorded radiation images.
  • the image storage area is used to read out a radiation image 36 of the fixed in a reading device 10 Image carrier 34 by means of a scanning beam 40 of an excitation light source 22 scanned. That when scanning pixels 42 of the image storage area 36 emitted useful light 44 with respect to scanning coordinates ⁇ , z of the read-out device 10 detected and in a raster-like representation of the radiation image Image matrix implemented digitally.
  • the image storage area 36 is based on an initial Correction image recording a correction value for each pixel 42 determined as an element of a correction matrix.
  • the Image matrix subsequently recorded on the image carrier 34 and read radiation images is then in accordance with the Correction matrix corrected pixel by pixel.

Landscapes

  • Facsimile Scanning Arrangements (AREA)
  • Conversion Of X-Rays Into Visible Images (AREA)
  • Radiography Using Non-Light Waves (AREA)

Claims (13)

  1. Procédé pour la lecture et le traitement d'images radiologiques enregistrées individuellement sur un support d'image (34) effaçable, en particulier une plaque d'image enduite d'une substance d'enregistrement cristalline, pour lequel
    la surface d'enregistrement d'image (36) du support d'image (34) positionné dans un dispositif de lecture (10) est balayée par un faisceau explorateur (40) d'une source de lumière d'excitation (22),
    la lumière utile (44) émise lors du balayage des points de l'image (42) de la surface d'enregistrement d'image (36) est saisie du point de vue des coordonnées de balayage (ϕ, z) du dispositif de lecture (10) et est convertie numériquement en une matrice d'image (B) reproduisant par quadrillage l'image radiologique,
    pour chaque point de l'image (42), une valeur de correction (cij) est déterminée comme élément d'une matrice de correction (C) pour la compensation d'hétérogénéités de la surface d'enregistrement de l'image (36),
    la matrice de correction est enregistrée dans un moyen d'enregistrement (30) affecté au support d'image (34),
    la matrice d'image (B) des images radiologiques lues ultérieurement sur le support d'image (34) est corrigée point par point dans la mesure ou selon les indications de la matrice de correction (C),
       caractérisé en ce que
    l'écart de la position de positionnement du support d'image (34) par rapport à une position théorique ou de consigne dans le dispositif de lecture (10) est déterminé et
    en ce que la matrice d'image (B) et la matrice de correction (C) affectée au support d'image sont reproduites l'une sur l'autre moyennant compensation de l'écart de positionnement, de telle sorte que les éléments de matrice de la matrice d'image et de la matrice de correction se correspondant l'un à l'autre (bij, cij) soient affectés respectivement au même points de l'image (42).
  2. Procédé selon la revendication 1, caractérisé en ce que les positions réelles d'au moins deux repères (48) disposés à distance l'un de l'autre sur le support d'image (34) sont saisies dans le dispositif de lecture (10) et sont comparées à des positions prédéfinies moyennant la détermination de l'écart de positionnement.
  3. Procédé selon la revendication 2, caractérisé en ce que les positions réelles des repères (48) sont saisies optiquement au moyen du faisceau explorateur (40) et sont déterminées dans les coordonnées de balayage (ϕ, z).
  4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la matrice d'image (B) et la matrice de correction (C) sont reproduites l'une sur l'autre par une transformation des coordonnées de balayage (ϕ, z), en particulier par une translation parallèle et / ou par une rotation.
  5. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce que le support d'image (34) est maintenu dans le dispositif de lecture (10) dans une position de positionnement prédéfinie par un dispositif de maintien.
  6. Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce que la matrice de correction (C) est déterminée à partir d'au moins une image de correction obtenue par une exposition homogène en surface de la surface d'enregistrement d'image (36).
  7. Procédé selon la revendication 6, caractérisé en ce que les valeurs de correction (cij) de la matrice de correction (C) sont déterminées à partir du rapport de l'intensité moyenne (I) et de l'intensité du point d'image (Iij) de l'image de correction, et en ce que les éléments (bij) de la matrice d'image (B) d'une image radiologique sont multipliés par les éléments correspondants (cij) de la matrice de correction (C).
  8. Procédé selon la revendication 6 ou 7, caractérisé en ce que plusieurs images de correction sont lues et, moyennant la saisie et la compensation de positions de positionnement du support d'image (34) différentes les unes des autres, sont superposées en coïncidence les unes sur les autres pour former une matrice de correction moyenne (C and).
  9. Procédé selon l'une quelconque des revendications 1 à 8, caractérisé en ce que pour chaque point de l'image (42), une courbe caractéristique de correction est déterminée en fonction d'un paramètre d'image, en particulier de l'intensité moyenne ou de la durée d'enregistrement de l'image radiologique, et en ce que la matrice de correction (C) est déterminée le cas échéant par interpolation à partir des courbes caractéristiques enregistrées point par point.
  10. Procédé selon l'une quelconque des revendications 1 à 9, caractérisé en ce qu'en cas de différentes résolutions de l'image, la matrice de correction (C) et la matrice d'image (B) sont adaptées l'une à l'autre par interpolation.
  11. Procédé selon l'une quelconque des revendications 1 à 10, caractérisé en ce que la matrice de correction (C) est enregistrée comme réseau de courbes sous la forme de relations fonctionnelles.
  12. Procédé selon l'une quelconque des revendications 1 à 11, caractérisé en ce que la matrice de correction (C) est enregistrée directement ou indirectement dans un moyen d'enregistrement 32, et en ce que la matrice de correction (C) enregistrée est affectée au support d'image (34) utilisé conformément à un codage 50 disposé sur le support d'image (34), en particulier configuré comme code à barres.
  13. Dispositif pour la lecture et le traitement d'images radiologiques enregistrées individuellement sur un support d'image (34) effaçable, en particulier une plaque d'image enduite d'une substance d'enregistrement cristalline, avec un dispositif de lecture (10) pour le positionnement du support d'image (34) et le balayage de sa surface d'enregistrement d'image (36) au moyen d'un faisceau explorateur (40) d'une source de lumière d'excitation (22), dans lequel, la lumière utile (44) déterminée lors du balayage des points de l'image (42) de la surface d'enregistrement d'image (36) est saisie au moyen de photodétecteurs (24) et, par un convertisseur analogique/numérique (28), est convertie en une matrice d'image (B) reproduisant par quadrillage l'image radiologique, un moyen d'enregistrement (32) pour l'enregistrement d'une matrice de correction (C) destinée à la compensation des hétérogénéités de la surface d'enregistrement d'image (36), matrice dont les éléments (cij) sont affectés individuellement aux points de l'image (42), et un ordinateur de traitement d'image (30) pour la correction point par point des images radiologiques lues dans le support d'image (34) dans la mesure ou selon les indications de la matrice de correction (C), caractérisé par un sous-programme de transformation chargé sur l'ordinateur de traitement d'image (30) pour la superposition, corrigée en position, de la matrice de correction (C) et de la matrice d'image (B) en fonction d'un écart, saisi au moyen du dispositif de lecture (10), de la position de positionnement du support d'image (34) par rapport à une position théorique ou de consigne.
EP98925555A 1997-05-14 1998-05-07 Procede dispositif pour la lecture et le traitement d'une image radiologique Expired - Lifetime EP0981766B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19719954 1997-05-14
DE19719954A DE19719954A1 (de) 1997-05-14 1997-05-14 Verfahren und Anordnung zum Auslesen und Verarbeiten eines Strahlungsbildes
PCT/EP1998/002695 WO1998052070A1 (fr) 1997-05-14 1998-05-07 Procede dispositif pour la lecture et le traitement d'une image radiologique

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EP0981766A1 EP0981766A1 (fr) 2000-03-01
EP0981766B1 true EP0981766B1 (fr) 2004-07-14

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EP98925555A Expired - Lifetime EP0981766B1 (fr) 1997-05-14 1998-05-07 Procede dispositif pour la lecture et le traitement d'une image radiologique

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EP (1) EP0981766B1 (fr)
JP (1) JP2002501701A (fr)
DE (2) DE19719954A1 (fr)
WO (1) WO1998052070A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10332344A1 (de) 2003-07-16 2005-02-17 Siemens Ag Verfahren zum Herstellen eines korrigierten Röntgenbilddatensatzes
EP2527874B1 (fr) 2011-05-26 2017-10-11 Agfa HealthCare NV Système, dispositif et procédé destinés à l'extraction d'informations radiographiques stockées sur un disque fluorescent de mémoire
CN113551578B (zh) * 2021-08-01 2023-07-07 李里 条形位移码、条形位移码尺和位移检测装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0089665B2 (fr) * 1982-03-20 1992-09-02 Fuji Photo Film Co., Ltd. Système et appareil pour le traitement soustractif d'images radioactives
EP0152563B1 (fr) * 1983-12-02 1988-09-07 Fuji Photo Film Co., Ltd. Procédé et dispositif pour l'enregistrement et la reproduction d'images de rayonnement
JPS60234643A (ja) * 1984-05-09 1985-11-21 富士写真フイルム株式会社 放射線画像情報再生方法及び装置
US5260573A (en) * 1990-11-21 1993-11-09 Konica Corporation Radiographical image reading apparatus

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Publication number Publication date
DE19719954A1 (de) 1998-11-19
EP0981766A1 (fr) 2000-03-01
WO1998052070A1 (fr) 1998-11-19
DE59811675D1 (de) 2004-08-19
JP2002501701A (ja) 2002-01-15

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