EP0396795B1 - Installation de radiodiagnostic - Google Patents

Installation de radiodiagnostic Download PDF

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Publication number
EP0396795B1
EP0396795B1 EP89108405A EP89108405A EP0396795B1 EP 0396795 B1 EP0396795 B1 EP 0396795B1 EP 89108405 A EP89108405 A EP 89108405A EP 89108405 A EP89108405 A EP 89108405A EP 0396795 B1 EP0396795 B1 EP 0396795B1
Authority
EP
European Patent Office
Prior art keywords
optical
ray diagnostic
ray
diagnostic device
optical device
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.)
Expired - Lifetime
Application number
EP89108405A
Other languages
German (de)
English (en)
Other versions
EP0396795A1 (fr
Inventor
Rainer Dipl.-Ing. Beierlein (Fh)
Gernhard Dipl.-Ing. Kütterer (FH)
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to DE89108405T priority Critical patent/DE58905397D1/de
Priority to EP89108405A priority patent/EP0396795B1/fr
Priority to JP1990047605U priority patent/JP2587049Y2/ja
Priority to US07/522,159 priority patent/US5042057A/en
Publication of EP0396795A1 publication Critical patent/EP0396795A1/fr
Application granted granted Critical
Publication of EP0396795B1 publication Critical patent/EP0396795B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05G—X-RAY TECHNIQUE
    • H05G1/00—X-ray apparatus involving X-ray tubes; Circuits therefor
    • H05G1/08—Electrical details
    • H05G1/64—Circuit arrangements for X-ray apparatus incorporating image intensifiers

Definitions

  • the invention relates to an X-ray diagnostic device with a transmission chain with imaging errors, which has an X-ray image intensifier and an optical device for imaging the output image of the X-ray image amplifier on an image recording device of the transmission chain coupled to the optical device.
  • Devices of this type are used, for example, to display X-ray images on television.
  • Such an X-ray diagnostic device is described in DE-A-31 27 648, in which the output image of the X-ray image intensifier is imaged by a basic lens coupled to the X-ray image intensifier and a camera lens on a coupled image recording device. In this case, the image is generated on the target of a television camera.
  • the X-ray image intensifier in particular, but also the television chain, have pincushion distortions. These distortions and the distance between the camera lens and the base lens result in an uneven distribution of brightness ("vignetting") in the image, which decreases concentrically from the center of the image to the edge of the image.
  • vignetting uneven distribution of brightness
  • the video signal was previously amplified differently, with the signal at the edge of the image being amplified more than that in the center of the image.
  • an X-ray diagnostic device is described in US Pat. No. 4,736,399, in which distortions of the recording device are subsequently corrected electronically. Undesired distortions, for example of the X-ray image intensifier, the optics and the television camera, are recorded, stored and then eliminated purely by calculation. However, this results in a lower signal-to-noise ratio at the edge of the picture, so that smoking increases disruptively.
  • this type of generation of a more uniform brightness distribution is only effective in the television camera, but not in other image recording devices such as a cinema camera or a medium format camera.
  • the invention is based on the object of creating an X-ray diagnostic device of the type mentioned at the outset by which a simple, effective and trouble-free correction of imaging errors (distortion, vignetting) is achieved.
  • the optical device has such a distortion that is opposite to the total aberration of the other links in the transmission chain, so that the entire aberration of the transmission chain is eliminated. This ensures that the imaging errors of the x-ray image intensifier, in particular the distortion and different brightness distribution in the image, are corrected by the optics.
  • Optical distortion corrections can be achieved by spherical or aspherical curvatures of individual elements of the optical devices, by changing the spacing of the elements of the optical devices or by selecting glass.
  • both and only one of these lenses can be provided with a barrel-shaped distortion for correction.
  • corrective measures can also be taken if the screen support and / or the end plate of the X-ray image intensifier and / or the stray light trap cause the distortion to be corrected.
  • An adaptation to different input fields of a switchable X-ray image intensifier can be achieved if different distortion corrections can be set. This can be done by actuators for changing the optical property of the optical device if they are connected to individual elements of the optical device.
  • a variable distortion correction can also be achieved if A plurality of optical elements are arranged on a turret arrangement and can be pivoted optionally into the beam path of the optical device.
  • FIG. 1 shows an X-ray tube 1, which is operated by a high-voltage generator 2 and emits a beam of rays that passes through a patient 3 and throws a radiation image onto the fluorescent screen of the X-ray image intensifier 4.
  • the X-ray image intensifier 4 converts the radiation image into a visible image on the exit fluorescent screen.
  • a tandem optical system 5, which contains a basic objective 6 and a camera objective 7, is coupled to the X-ray image intensifier 4. Through these lenses 6 and 7, the output image of the X-ray image intensifier 4 is imaged on the target of a television camera 8.
  • the output signal of the television camera 8 is amplified in a video amplifier 9 and reproduced as a visible image on a monitor 10.
  • Such transmission devices 4 to 10 have many aberrations. This also includes pillow-shaped distortion errors, which, for example, produce an image exaggerated in FIG. At the same time, the image shows a decrease in brightness towards the edge. This is shown in FIG. 5 using curve a, for example. In this representation, the intensity I of the brightness is plotted against the distance r from the center of the image.
  • the lenses 6 and 7 can have the construction shown in FIG. In this example, they consist of seven elements 11 to 17, some of which are arranged in groups.
  • the distortion is corrected as a partial or full correction by designing the elements 11 to 17, which together have an optical, barrel-shaped distortion, so that the pillow-shaped distortion, in particular of the X-ray image intensifier 4, but also of the transmission chain 8 to 10, is corrected.
  • the image When the distortion is fully corrected, the image has the desired straight course of the lines shown in FIG. 4. As a result of the complete elimination or at least the reduction in the distortion-related brightness drop, the brightness distribution in the image shows the significantly more favorable curve shown in FIG. 5 using curve b.
  • a partial correction can be carried out for the largest x-ray image intensifier format to be set, which has less pincushion distortion than before.
  • the smallest RBV format can be over-corrected by a medium, barrel-shaped distortion.
  • Such a correction would be of interest, for example, for medium to large-format image intensifiers 4 for limb angiography.
  • the barrel distortion correction can also be designed in this way be that a certain input field of a switchable X-ray image intensifier 4, which is preferably used, for example, for measurements (cardiac volume, vessel diameter), is optimally corrected, while the larger and / or smaller input fields are under- or over-corrected.
  • the corrective measures can take place within only one objective 6 or 7 of the tandem optics 5 or can be divided between both objectives 6 and 7 of the tandem optics 5.
  • the optically effective components of the X-ray image intensifier 4 such as the faceplate, the end plate and the stray light trap, can also be included in the consideration of the distortion correction, so that the overall length of the X-ray image intensifier can be shortened and / or additional degrees of freedom for the calculation of the Receives electron optics.

Landscapes

  • Apparatus For Radiation Diagnosis (AREA)
  • Transforming Light Signals Into Electric Signals (AREA)
  • X-Ray Techniques (AREA)

Claims (7)

  1. Appareil de radiodiagnostic comportant une chaîne de transmission (4 à 10) affectée de défauts d'image et qui comporte un amplificateur de brillance radiologique (4) et un dispositif optique (5) servant à représenter l'image de sortie de l'amplificateur de brillance radiologique (4) sur un dispositif d'enregistrement d'image (8) de la chaîne de transmission (4 à 10)
       couplé au dispositif optique (5), caractérisé par le fait que le dispositif optique (5) produit une distorsion d'image, qui est opposée à l'ensemble du défaut d'image des autres éléments de la chaîne de transmission et est telle que le défaut d'image, dans son ensemble, produit par la chaîne de transmission (4 à 10), est éliminé.
  2. Appareil de radiodiagnostic suivant la revendication 1, comportant un système optique tandem (5) en tant que dispositif optique qui possède un objectif de base (6) et un objectif d'appareil de prise de vues (7), caractérisé par le fait que les deux objectifs (6,7) sont affectés de distorsions d'image, pour la correction.
  3. Appareil de radiodiagnostic suivant la revendication 1, comportant un système optique tandem (5) en tant que dispositif optique qui possède un objectif de base (6) et un objectif d'appareil de prise de vues (7), caractérisé par le fait que seul l'un des objectifs (6 et 7) du système optique tandem (5) est affecté de distorsions d'image, pour la correction.
  4. Appareil de radiodiagnostic suivant l'une des revendications 1 à 3, caractérisé par le fait que des supports de blindage et/ou la plaque terminale de l'amplificateur de brillance radiologique (4) et/ou le puits absorbant la lumière diffuse réalisent une correction des distorsions d'image.
  5. Appareil de radiodiagnostic suivant les revendications 1 à 4, caractérisé par le fait qu'on peut établir des corrections différentes de distorsion d'image.
  6. Appareil de radiodiagnostic suivant la revendication 5, caractérisé par le fait que des éléments de réglage (18) servant à modifier la caractéristique optique du dispositif optique (5) sont reliés à des éléments (13) du dispositif optique (5).
  7. Appareil de radiodiagnostic suivant la revendication 5, caractérisé par le fait que plusieurs éléments optiques, que l'on peut faire basculer au choix, dans le trajet de rayonnement du dispositif optique (5), sont montés sur un dispositif revolver.
EP89108405A 1989-05-10 1989-05-10 Installation de radiodiagnostic Expired - Lifetime EP0396795B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE89108405T DE58905397D1 (de) 1989-05-10 1989-05-10 Röntgendiagnostikeinrichtung.
EP89108405A EP0396795B1 (fr) 1989-05-10 1989-05-10 Installation de radiodiagnostic
JP1990047605U JP2587049Y2 (ja) 1989-05-10 1990-05-07 Ｘ線診断装置
US07/522,159 US5042057A (en) 1989-05-10 1990-05-10 X-ray diagnostics installation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP89108405A EP0396795B1 (fr) 1989-05-10 1989-05-10 Installation de radiodiagnostic

Publications (2)

Publication Number Publication Date
EP0396795A1 EP0396795A1 (fr) 1990-11-14
EP0396795B1 true EP0396795B1 (fr) 1993-08-25

Family

ID=8201336

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89108405A Expired - Lifetime EP0396795B1 (fr) 1989-05-10 1989-05-10 Installation de radiodiagnostic

Country Status (4)

Country Link
US (1) US5042057A (fr)
EP (1) EP0396795B1 (fr)
JP (1) JP2587049Y2 (fr)
DE (1) DE58905397D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4438458C5 (de) * 1994-10-29 2008-04-17 Linos Photonics Gmbh & Co. Kg Optisches System mit einem Röntgenbildverstärker

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9215160U1 (de) * 1992-11-06 1993-12-09 Siemens AG, 80333 München Anordnung mit einem Bildverstärker und einem Bildempfänger

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3244878A (en) * 1963-09-19 1966-04-05 Stevenson Stereoscopic X-ray examination apparatus with light conductive rods to transmit the optical images
US4058833A (en) * 1974-12-31 1977-11-15 Picker Corporation Radiation imaging apparatus and method
NL7600142A (nl) * 1976-01-08 1977-07-12 Philips Nv Werkwijze en inrichting voor het afregelen van een beeldversterkerketen.
JPS55148354A (en) * 1979-05-08 1980-11-18 Toshiba Corp X-ray image multiplier
US4359759A (en) * 1980-04-21 1982-11-16 Technicare Corporation Bias lighting in a radiographic apparatus and method
NL8004727A (nl) * 1980-08-21 1982-03-16 Philips Nv Stralingsonderzoekapparaat met spleetvormige bundel.
JPS6135687A (ja) * 1984-07-27 1986-02-20 Toshiba Corp Ｘ線診断装置
JPS6145737A (ja) * 1984-08-08 1986-03-05 株式会社東芝 Ｘ線検査装置
FR2580827B1 (fr) * 1985-04-19 1987-05-22 Thomson Cgr Installation de radiologie
DE3626532A1 (de) * 1986-08-06 1988-02-11 Siemens Ag Roentgendiagnostikeinrichtung mit einer matrix optoelektronischer sensoren

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
FACHLEXIKON ABL PHYSIK, R. Lenk und W. Gilbert, VEB Edition, Leipzig, Verlag Harri Deutsch, Zürich, 1974, Seite 13 *
Handbook of Optics, 1978 by Mc Graw-Hill, Inc., USA, Seite 13-17 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4438458C5 (de) * 1994-10-29 2008-04-17 Linos Photonics Gmbh & Co. Kg Optisches System mit einem Röntgenbildverstärker

Also Published As

Publication number Publication date
JP2587049Y2 (ja) 1998-12-14
US5042057A (en) 1991-08-20
EP0396795A1 (fr) 1990-11-14
JPH02143879U (fr) 1990-12-06
DE58905397D1 (de) 1993-09-30

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