EP0437650A1 - Installation de radiodiagnostic - Google Patents

Installation de radiodiagnostic Download PDF

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Publication number
EP0437650A1
EP0437650A1 EP90100756A EP90100756A EP0437650A1 EP 0437650 A1 EP0437650 A1 EP 0437650A1 EP 90100756 A EP90100756 A EP 90100756A EP 90100756 A EP90100756 A EP 90100756A EP 0437650 A1 EP0437650 A1 EP 0437650A1
Authority
EP
European Patent Office
Prior art keywords
diagnostic device
ray
ray diagnostic
roller
dominant
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Withdrawn
Application number
EP90100756A
Other languages
German (de)
English (en)
Inventor
Arthur Dipl.-Ing. Gall
Adelbert Dipl.-Ing. Kupfer (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 EP90100756A priority Critical patent/EP0437650A1/fr
Priority to JP1991003804U priority patent/JPH0491100U/ja
Priority to US07/641,787 priority patent/US5067142A/en
Publication of EP0437650A1 publication Critical patent/EP0437650A1/fr
Withdrawn legal-status Critical Current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
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
    • G21K1/00—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
    • G21K1/02—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators
    • 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
    • H05G1/26—Measuring, controlling or protecting
    • H05G1/30—Controlling
    • H05G1/38—Exposure time
    • H05G1/42—Exposure time using arrangements for switching when a predetermined dose of radiation has been applied, e.g. in which the switching instant is determined by measuring the electrical energy supplied to the tube
    • H05G1/44—Exposure time using arrangements for switching when a predetermined dose of radiation has been applied, e.g. in which the switching instant is determined by measuring the electrical energy supplied to the tube in which the switching instant is determined by measuring the amount of radiation directly

Definitions

  • the invention relates to an X-ray diagnostic device for generating X-ray images with an X-ray image intensifier and a detector for measuring the average image brightness in a dominant area of the output screen of the X-ray image intensifier, means being provided by means of which the size and position of the dominant area can be changed.
  • Devices of this type are used for television-type image reproduction and for producing individual images and series of images, the detector serving to keep the average image brightness constant in the dominant region.
  • Such an X-ray diagnostic device is described in DE-A-31 27 648, in which, in the parallel beam path of the optics arranged between the output fluorescent screen of the X-ray image intensifier and the television camera, a part is masked out by a mirror which is fed to a detector with a selectable dominant range. The selection is made using a dominant disc connected upstream of a photomultiplier. There are limits to the size, shape, position and size of the dominant area through the dominant disc.
  • the invention is based on the object of creating an X-ray diagnostic device of the type mentioned at the outset, in which the options for selecting the dominant area increase with only a small structural size.
  • the object is achieved in that the means have a roller conveyor made of opaque material, in which several openings are provided as measuring fields.
  • the result of this is that a large number of dominant areas of different sizes, different in position and shape, can be set in a simple manner in a small space.
  • a simple change in the measuring field for the detector is obtained if the roller belt is driven by a drive motor, the drive motor being connected to a transport roller. It has proven to be advantageous if the transport roller is connected to a torsion spring which generates a tensioning moment.
  • the transport of the roller belt can also be effected if the drive motor is provided with a toothed wheel which engages in a perforation provided in the roller belt for the transport. This also ensures that safe and slip-free control of the measuring fields can take place. It has proven to be advantageous if the transport roller is provided with counteracting tensioning devices.
  • a simple change of funds can be achieved if the roller conveyor is installed in a cassette. The control time can be shortened if the conveyor belt is an endless belt.
  • FIG. 1 shows an X-ray tube 1 which is operated by a high-voltage generator 2 and emits a beam of rays which passes through a patient 3 and throws a radiation image onto the fluorescent screen of an X-ray image intensifier 4.
  • the X-ray image intensifier 4 converts the radiation image into a visible image on the output fluorescent screen 18.
  • An optics 5 is coupled to the x-ray image intensifier 4, which contains a base lens 6 and a camera lens 7. Through these lenses 6 and 7, the output image of the X-ray image intensifier 4 is imaged on the target 19 of a television camera 8.
  • the output signal of the television camera 8 is amplified in a video amplifier 9 and reproduced on a monitor 10.
  • a mirror 12 is arranged in the telecentric beam path 11 between the base lens 6 and the camera lens 7, which deflects a part of the parallel rays laterally out of the telecentric beam path 11.
  • Another optical system 13 generates an image on a detector 14, for example a photomultiplier.
  • the detector 14 is connected to a measuring amplifier, not shown, arranged in a control device 15.
  • the control device 15 has an adjuster 16 for the setpoint value of the brightness and is connected to the high-voltage generator 2 for exposure control.
  • the base lens 6 shows the beam path of the base lens 6 and camera lens 7 in more detail.
  • the light diverging from a point on the exit fluorescent screen 18 of the X-ray image intensifier is captured by the base lens 6 and converted into the telecentric beam path 11 with parallel rays.
  • the camera lens 7 detects the beam path 11 and forms the point through its converging beam on the target 19 of the television camera 8.
  • the mirror 12 which can also be formed by a prism, is arranged in the telecentric beam path 11.
  • a first lens 20 of the optics 13 is arranged in front of the mirror surface.
  • a second lens 21 is arranged in front of the detector 14 at a distance behind the mirror 12 and forwards the image to the detector 14.
  • the optics 13 are set such that the output image of the X-ray image intensifier 4 can be completely imaged in the image plane on a roller belt 22 arranged in front of the lens 21 for the detector 14.
  • the roller belt 22 covers the dominant parts of the output image of the X-ray image intensifier 4 for determining the measuring field, so that only the remaining parts can contribute to the exposure control.
  • FIG. 3 shows such a roller belt 22 according to the invention, which is wound on two transport rollers 23 and 24.
  • a drive motor 25 for example a stepper motor, is attached to the transport roller 24 and is connected to setting means 17 for the selection of the dominant by a control (not shown).
  • the transport roller 23 can be connected to means for resetting or generating a tensioning moment, for example a torsion spring, so that the conveyor belt 22 is stretched between the transport rollers 23 and 24.
  • the roller belt 22 has a plurality of openings 26 to 28 of the most varied of shapes, positions and numbers. These openings 26 to 28 determine the respective dominant areas that are used for the measurement. 3, the beam path 29 of the lens 20 passes through the opening 27 and is limited thereby. The second lens 21 then images the residual rays on the detector 14, so that only the portion of the beam path penetrating through the opening 27 contributes to the measurement.
  • the roller belt 22 can be made of any opaque material.
  • a metal or plastic film can preferably be used.
  • FIG. 22 A further type of drive for the roller conveyor 22 is shown in FIG.
  • the drive motor 25 is connected to a gear 30 which engages in a perforation 31 for transport.
  • the transport rollers 23 and 24 are each provided with oppositely acting devices, not shown, for generating a restoring or tensioning torque. These can be torsion springs, for example.
  • the conveyor belt 22 is shown as an endless belt. This runs again via the transport rollers 23 and 24.
  • the gearwheel 30 of the drive motor 25 engages in a perforation 31, which, controlled by the control device, effects an adjustment of the dominant.
  • a mirror 32 can be arranged between the two strands of the roller conveyor 22, which causes the beam path 29 to be deflected onto the detector 14 (not shown in this figure).
  • the detector can also be arranged directly between the two strands.
  • the endless belt can be guided in a meandering manner by means of deflection rollers in the case of a large number of openings 26 to 28.
  • the tape can also be installed in cassettes, similar to roll film cassettes in cameras. In this case, a quick change is possible.
  • the inventive design of the masking of the dominant measuring fields by means of the conveyor belt 22 results in an X-ray diagnostic device in which any number of measuring fields in any size and position can be accommodated on the belt.
  • the measuring field figures and their arrangement can be adapted according to customer requirements.
  • These roller tapes 22 for determining the measuring field size of the dominant can be easily changed by the service if required.

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Apparatus For Radiation Diagnosis (AREA)
  • X-Ray Techniques (AREA)
EP90100756A 1990-01-15 1990-01-15 Installation de radiodiagnostic Withdrawn EP0437650A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP90100756A EP0437650A1 (fr) 1990-01-15 1990-01-15 Installation de radiodiagnostic
JP1991003804U JPH0491100U (fr) 1990-01-15 1991-01-11
US07/641,787 US5067142A (en) 1990-01-15 1991-01-16 X-ray diagnostics installation with a gating unit for the dominant image region

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP90100756A EP0437650A1 (fr) 1990-01-15 1990-01-15 Installation de radiodiagnostic

Publications (1)

Publication Number Publication Date
EP0437650A1 true EP0437650A1 (fr) 1991-07-24

Family

ID=8203500

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90100756A Withdrawn EP0437650A1 (fr) 1990-01-15 1990-01-15 Installation de radiodiagnostic

Country Status (3)

Country Link
US (1) US5067142A (fr)
EP (1) EP0437650A1 (fr)
JP (1) JPH0491100U (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4102445C1 (fr) * 1991-01-28 1992-03-05 Siemens Ag, 8000 Muenchen, De
US5218626A (en) * 1992-05-01 1993-06-08 Picker International, Inc. Solid state photo sensor with adjustable viewing means
US5537047A (en) * 1993-10-12 1996-07-16 Philips Electronics North America Corporation Video noise analyzer
CN107638185B (zh) * 2016-07-21 2024-03-22 瑞地玛医学科技有限公司 一种c臂影像系统

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3539813A (en) * 1967-11-24 1970-11-10 Varian Associates Beam width defining structure for linear accelerator radiotherapy devices
DE3127648A1 (de) * 1981-07-13 1983-01-20 Siemens AG, 1000 Berlin und 8000 München Roentgendiagnostikvorrichtung
EP0084738A2 (fr) * 1982-01-27 1983-08-03 Kabushiki Kaisha Toshiba Masque pour déterminer le champ de rayons-X
EP0087843A1 (fr) * 1982-03-03 1983-09-07 Koninklijke Philips Electronics N.V. Appareil d'examen à rayons X.
GB2132460A (en) * 1982-12-27 1984-07-04 John K Grady X-ray apparatus and method
DE3802351A1 (de) * 1988-01-27 1989-08-10 Siemens Ag Roentgendiagnostikanlage

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4335307A (en) * 1980-04-21 1982-06-15 Technicare Corporation Radiographic apparatus and method with automatic exposure control

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3539813A (en) * 1967-11-24 1970-11-10 Varian Associates Beam width defining structure for linear accelerator radiotherapy devices
DE3127648A1 (de) * 1981-07-13 1983-01-20 Siemens AG, 1000 Berlin und 8000 München Roentgendiagnostikvorrichtung
EP0084738A2 (fr) * 1982-01-27 1983-08-03 Kabushiki Kaisha Toshiba Masque pour déterminer le champ de rayons-X
EP0087843A1 (fr) * 1982-03-03 1983-09-07 Koninklijke Philips Electronics N.V. Appareil d'examen à rayons X.
GB2132460A (en) * 1982-12-27 1984-07-04 John K Grady X-ray apparatus and method
DE3802351A1 (de) * 1988-01-27 1989-08-10 Siemens Ag Roentgendiagnostikanlage

Also Published As

Publication number Publication date
JPH0491100U (fr) 1992-08-07
US5067142A (en) 1991-11-19

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