EP0794536B1 - Appareil d'examen à rayons X avec une source à rayons X en association avec une unité de diaphragme - Google Patents

Appareil d'examen à rayons X avec une source à rayons X en association avec une unité de diaphragme Download PDF

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Publication number
EP0794536B1
EP0794536B1 EP97200651A EP97200651A EP0794536B1 EP 0794536 B1 EP0794536 B1 EP 0794536B1 EP 97200651 A EP97200651 A EP 97200651A EP 97200651 A EP97200651 A EP 97200651A EP 0794536 B1 EP0794536 B1 EP 0794536B1
Authority
EP
European Patent Office
Prior art keywords
ray
source
control unit
focal spot
shutters
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
EP97200651A
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German (de)
English (en)
Other versions
EP0794536A1 (fr
Inventor
Heinz-Peter Kunert
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.)
Philips Intellectual Property and Standards GmbH
Koninklijke Philips NV
Original Assignee
Philips Corporate Intellectual Property GmbH
Philips Patentverwaltung GmbH
Koninklijke Philips Electronics NV
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 Philips Corporate Intellectual Property GmbH, Philips Patentverwaltung GmbH, Koninklijke Philips Electronics NV filed Critical Philips Corporate Intellectual Property GmbH
Publication of EP0794536A1 publication Critical patent/EP0794536A1/fr
Application granted granted Critical
Publication of EP0794536B1 publication Critical patent/EP0794536B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • 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
    • G21K1/04—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators using variable diaphragms, shutters, choppers
    • 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

Definitions

  • the invention relates to an X-ray examination device with an X-ray source Generation of X-rays, an X-ray image recorder for recording X-rays, an aperture unit connected to the X-ray tube with adjustable diaphragm sliders for limitation from a first source or from a second source Beam and with a control unit controlling the drive arrangement.
  • Such an X-ray examination device is essentially from EP-OS 685 200 and known from GB-PS 1 313 296 - but without a drive arrangement for the diaphragm slide.
  • these X-ray examination devices is in the A light source unit is provided, which via a deflecting mirror Irradiated object.
  • the light source 's beam is emitted by the Aperture sliders limited, and the field illuminated in this way is intended to Examiners indicate which area of the patient is following X-ray image is shown, in which the shutter is in its respective Stay in position.
  • the Dimensions of the light source first source
  • Focal spots second source
  • This task will solved according to the invention in that the control of the drive arrangement by the control unit is designed so that the diaphragm slide when limiting the Beam of the first source a first and in limiting the Beams of the second source assume a second position, the first and the second position are such that the through the shutter hidden radiation fields of the sources in the plane of the X-ray image sensor each have the same size.
  • the invention is based on the consideration that the two sources are never at the same time are effective. If, for example, with the help of the light source, a certain field is illuminated at a predetermined position, then the shutter determined according to the invention on the basis of the predetermined geometry of the arrangement, like the position of the shutter on a subsequent X-ray must, so that exactly the previously illuminated field is penetrated by X-rays.
  • the control unit controls the drive arrangement for the diaphragm slide in such a way that at the transition from one source to the other, the diaphragm slides go from their first position to the calculated second position.
  • the A light source for illuminating the from an x-ray contains irradiated field and that the control unit is programmed so that the Transition to an x-ray of the shutter from the first one Light source assigned position in the second, a focal spot of the X-ray radiator assigned aperture position is transferred. Because here Transition to an x-ray open the diaphragm shutters until they are exactly the field previously illuminated by the light source is hit by the X-rays it is not important that the optical distance of the light source from the Aperture sliders is just as large as the distance of the focal spot from the Aperture sliders - as with the known devices. The light source can therefore be positioned within the panel unit as it is from a constructive Reasons is cheapest.
  • Another development of the invention which also in combination with the the aforementioned embodiment is applicable - provides that the X-ray source has at least two focal spots of different sizes, and that the Control unit is programmed so that the transition from the large to the small Focal spot the drive assembly is controlled so that the aperture slider to open.
  • This effort can be after a development of the invention thereby reduce that the control unit for calculating the positions of the Aperture slider is set up depending on geometric parameters and that at least one of the parameters is dependent on a test recording can be specified.
  • the deviations can be entered by software correct a parameter that can be derived from a test recording.
  • Fig. 1 is the focal spot of an X-ray tube 3, which is in a housing 4 is located.
  • the size of the focal spot 1 can be in a known manner switchable or continuously changeable.
  • a panel unit 5 attached mechanically adjustable in different levels coupled aperture slide 6 with perpendicular to the plane of the drawing Has diaphragm edges which in this direction that of the focal spot 1 limit outgoing X-ray beams.
  • the aperture unit further, not shown in Fig. 1 diaphragm valve available, the Limit rays parallel to the plane of the drawing.
  • the Aperture unit 5 is a light source 2, which is used for X-rays transparent or removable from the beam path of the X-ray tube 3
  • Deflecting mirror 7 can illuminate an examination object 8 and thereby the User displays the size of a subsequent x-ray.
  • the examination object 8 is located on a schematically represented Storage table 10, below which there is an image sensor 9 for example, a film in a cassette.
  • the distance of the object 8 from the X-ray emitter 3, 4 - and thus the distance of the focal spot 1 from the Image sensor 9 - can be adapted to the diagnostic requirements.
  • the dimensions of the focal spot 1 are significantly smaller than the light-emitting luminous area of the light source 2.
  • the effective focal spot of an X-ray tube has dimensions of 1 mm 2 or less, while the dimensions of the luminous area are considerably larger, especially if one Light source with high intensity and / or long life is used.
  • the marginal rays of the beam emanating from the light source 2, deflected by the deflecting mirror 7 and delimited by the diaphragm slide 6 are designated by 200 in FIG. 2.
  • the marginal rays 100 of the x-ray beam emitted by the focal spot 1, which would result if, as is generally customary, the diaphragm sliders 6 were not changed during the transition to an x-ray image, are indicated in FIG. 2 by the dash-dotted lines 100.
  • the distance of the focal spot 1 from the diaphragm slides 6 is denoted by d, while D is the distance of the focal spot 1 from the plane of the image sensor.
  • the x-ray field defined by the marginal rays 100 is smaller than the field defined by the marginal rays of the light source 200 if the path of the central beam 110 from the focal spot to the recording medium 9 is as long as the path that a light beam has from the center the light source 2 travels along the central beam 110.
  • the edge rays 101 identify an X-ray beam whose X-ray radiation field is the same size as the H-size field illuminated by the light source 2 on the film 9.
  • the opening is h 1 , which blocks the X-ray beam emanating from the focal spot 1 with the edge rays 101 would be larger than the opening h 2 of the diaphragm slide 6, through which the same field is illuminated by the light source 2 with the marginal rays 200.
  • the diaphragm slides are opened from position h 2 to position h 1 during the transition to an X-ray image, the field illuminated by light source 2 in one case and the field illuminated by X-ray image in the other case match.
  • the Aperture slide 6 are adjusted by a drive arrangement, the one Adjusting motor 11 comprises and a drive stage 12, which the motor 11 supplies required energy.
  • the drive stage 12 is controlled by a control unit 13 controlled, which calculates the required opening h of the diaphragm slide and controls the drive stage 12 accordingly.
  • the diaphragm slide 6 is a Position sensor 14 mechanically coupled, the one of the position of the shutter corresponding signal h returns to the control unit 13, this signal with compares its target value and, in the event of deviations, the drive stage 12 accordingly controls.
  • the control unit 13 contains a microcomputer, which in addition to the actual position value h a signal D is supplied, which is supplied by a distance sensor 14 which the respective distance of the focal spot 1 from the film plane 9 and a corresponding signal D is generated.
  • the control unit 13 is also a signal f supplied, which indicates the size of the focal spot 1 (e.g. larger or smaller Focus).
  • the operating state is a signal b of the control unit 13 signals, i.e. whether a recording is currently being switched or should be or whether the examination field is to be illuminated using the light source 2.
  • the aperture unit 13 is fed a signal H, which is the size of the Image sensor 9 indicates and a signal T, which signals whether the position of the Aperture should be determined by the film format or by a So-called object-oriented setting, in which the user uses a suitable input member can specify a smaller aperture than that Film format corresponds.
  • the control unit 13 calculates a target value h 2 for the position of the diaphragm sliders to limit the light bundle emanating from the light source 2 from the signals D, H, the size of the light source 2 and the optical distance d (Fig. 2) of the light source from the front shutter 6.
  • the control unit uses the signals f, H, D and d to calculate the position h 1 of the shutter which is required to expose the H format by means of the X-ray image.
  • the control unit 13 regulates the diaphragm slide either to the opening h 1 or to the opening h 2 .
  • the user specifies a smaller recording field than corresponds to the format of the image sensor.
  • a suitable recording field is initially specified with the aid of the light source, a specific value h 2 resulting for the opening of the diaphragm slide, which is registered by the control unit 13.
  • the control unit uses the value h 2 and the values d, D and f to calculate the position h 1 of the diaphragm slider, in which the x-ray field would have the same size as the illuminated field.
  • the signal b changes and the control unit 13 specifies the value h 1 for the position of the diaphragm slide instead of the value h 2 .
  • the Light source 2 is optically the same distance from the diaphragm slides 6 as that Focal spot 1 because the diaphragm slide 6 can always be controlled so that at a subsequent X-ray exposes exactly the previously illuminated field becomes.
  • the position of the light source 2 can therefore from a design point of view be specified.
  • Such a change can occur when the X-ray tube is replaced result because the position of the X-ray emitters of the same type X-ray tube in relation to the housing 4 and the position of the focal spot in relation on the x-ray tube can differ by mm.
  • FIG. 3 shows the geometric relationships in a test image, preferably taken with the smallest focal spot, in which the diaphragm slides are set to a predetermined value h and the image sensor is arranged at a defined distance D from the focal spot 1.
  • the focal spot 1 is located at the predetermined location, ie at a distance d from the diaphragm slides 6, then a radiation field results with the marginal rays shown in solid lines 103.
  • the given relationship for x is only a good approximation, the better the smaller the focal spot is.
  • the focal spot size comes in as an additive value, which is independent of the dimensions H of the X-ray imaging field. Too To correct this influence, two X-rays can be made in the same Distance d, but with different aperture opening can be made from which the influence of the focal spot size can be eliminated. - If the focal spot size the X-ray tube is known, this can also be done in the calculation the displacement x are taken into account.

Claims (4)

  1. Appareil de radiographie avec un générateur de rayons X (3,4) en vue de la production de rayons X, un enregistreur d'images radiographiques (9) en vue de l'enregistrement d'images radiographiques, une unité à diaphragme (5) reliée au générateur de rayons X (3, 4) avec des diaphragmes (6) réglables par un dispositif d'entraínement (11, 12) en vue de la limitation du faisceau de rayons X (100, 200) sortant d'une première source
    (1) ou d'une deuxième source (2) et avec une unité de commande (13) commandant le dispositif d'entraínement, caractérisé en ce que la commande du dispositif d'entraínement (11, 12) par l'unité de commande (13) est conçue de telle sorte que, lors de la limitation du faisceau de rayons X (101) de la première source (1), le diaphragme adopte une première position (h1) et, lors de la limitation du faisceau de rayons X (200) de la deuxième source
    (2) une deuxième position (h2), les première et deuxième positions étant telles que les champs de rayons des sources (1, 2) diffusés par les diaphragmes dans le plan de l'enregistreur d'images radiographiques (9) présentent respectivement la même grandeur (H).
  2. Appareil d'examen radiographique selon la revendication 1,
    caractérisé en ce que l'unité d'écran contient une source lumineuse (2) en vue de l'exposition du champ couvert par une radiographie et que l'unité de commande est programmée de telle sorte qu'en cas de passage à une radiographie, le diaphragme (6) est transformé de la première position affectée à la source lumineuse (2) à la deuxième position affectée à un foyer (1) du générateur de rayons X.
  3. Appareil d'examen radiographique selon la revendication 1,
    caractérisé en ce que le générateur de rayons X présente au moins deux foyers de taille différente et que l'unité de commande est programmée de telle sorte qu'en cas de passage du grand foyer au petit foyer le dispositif d'entraínement est commandé de telle sorte que les diaphragmes s'ouvrent.
  4. Appareil d'examen radiographique selon la revendication 1,
    caractérisé en ce que l'unité de commande (13) est agencée en vue du calcul des positions des diaphragmes en fonction des paramètres géométriques et qu'au moins l'un des paramètres (Ht, x) peut être préalablement déterminé en fonction d'un cliché de test.
EP97200651A 1996-03-07 1997-03-05 Appareil d'examen à rayons X avec une source à rayons X en association avec une unité de diaphragme Expired - Lifetime EP0794536B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19608862 1996-03-07
DE19608862A DE19608862A1 (de) 1996-03-07 1996-03-07 Röntgenuntersuchungsgerät mit einem Röntgenstrahler und einer damit verbundenen Blendeneinheit

Publications (2)

Publication Number Publication Date
EP0794536A1 EP0794536A1 (fr) 1997-09-10
EP0794536B1 true EP0794536B1 (fr) 2001-10-04

Family

ID=7787528

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97200651A Expired - Lifetime EP0794536B1 (fr) 1996-03-07 1997-03-05 Appareil d'examen à rayons X avec une source à rayons X en association avec une unité de diaphragme

Country Status (4)

Country Link
US (1) US5844962A (fr)
EP (1) EP0794536B1 (fr)
JP (1) JPH1026805A (fr)
DE (2) DE19608862A1 (fr)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE9700277D0 (sv) * 1997-01-30 1997-01-30 Siemens Elema Ab Röntgenfotografeingsanordning
DE29710724U1 (de) * 1997-06-19 1997-09-25 Mueller Wulf Blendensteuerung für medizinisches Röntgendiagnostikgerät mit drehbaren Bedienelementen zur Veränderung der Größe der Blendenöffnung
DE19755764C2 (de) * 1997-12-16 2003-07-31 Instrumentarium Imaging Ziehm Verfahren zum Betrieb einer Röntgendiagnostikeinrichtung mit einer Röntgenbildwandler-Fernsehkette und Vorrichtung zur Durchführung eines solchen Verfahrens
DE19837512A1 (de) 1998-08-19 2000-02-24 Philips Corp Intellectual Pty Röntgenuntersuchungsgerät mit einer Blendeneinheit
FI981859A0 (fi) * 1998-08-31 1998-08-31 Heikkinen Jari Laite munuaistoiminnan gammakuvauksen kalibrointiin
WO2000064223A2 (fr) * 1999-04-17 2000-10-26 Edward Chen Appareil de projection combine a rayons x et laser
US6502985B1 (en) * 2000-05-05 2003-01-07 Canon Kabushiki Kaisha Auto-collimating digital X-ray system
DE10327293A1 (de) * 2003-06-17 2005-01-20 Siemens Ag Röntgenuntersuchungsverfahren mit automatischer Kollimation sowie zugehörige Vorrichtung
CN1888977B (zh) * 2005-06-29 2010-09-08 Ge医疗系统环球技术有限公司 X光照相系统
CN100454039C (zh) * 2005-09-22 2009-01-21 同方威视技术股份有限公司 一种射线发生器、导束盒和前、后准直器一体化结构
DE102008006620A1 (de) 2008-01-29 2009-08-06 Smiths Heimann Gmbh Röntgenstrahlerzeuger sowie dessen Verwendung in einem Röntgenuntersuchungs- oder Röntgenprüfgerät
US9566040B2 (en) * 2014-05-14 2017-02-14 Swissray Asia Healthcare Co., Ltd. Automatic collimator adjustment device with depth camera and method for medical treatment equipment
KR101798939B1 (ko) * 2015-09-08 2017-11-17 삼성전자주식회사 엑스선 영상 장치 및 그 제어방법
US10556129B2 (en) * 2015-10-02 2020-02-11 Varian Medical Systems, Inc. Systems and methods for treating a skin condition using radiation

Family Cites Families (9)

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Publication number Priority date Publication date Assignee Title
GB1313296A (en) * 1969-05-22 1973-04-11 Philips Electronic Associated X-ray apparatus
DE2124035A1 (de) * 1971-05-14 1972-11-23 Siemens AG, 1000 Berlin u. 8000 München Röntgenuntersuchungsgerät mit einer Meßeinrichtung zur Patientendosimetrie
DE3136806A1 (de) * 1981-09-16 1983-03-31 Siemens AG, 1000 Berlin und 8000 München Roentgenuntersuchungsgeraet
US4502147A (en) * 1982-08-09 1985-02-26 Charles Lescrenier Means for visually indicating an X-ray field
EP0142841A3 (fr) * 1983-11-18 1987-04-29 Kabushiki Kaisha Toshiba Dispositif limiteur de faisceau pour un appareil de radiodiagnostic
DE3568133D1 (en) * 1984-12-03 1989-03-16 Siemens Ag Diaphragm for primary radiation in an x-ray examination apparatus
FR2634094B1 (fr) * 1988-07-05 1992-04-10 Gen Electric Cgr Appareil a rayons x a visualisation de la geometrie du faisceau de rayons x
SE9401904D0 (sv) * 1994-06-02 1994-06-02 Siemens Elema Ab Röntgenundersökningsapparat
FR2721789A1 (fr) * 1994-06-24 1995-12-29 Ge Medical Syst Sa Appareil d'irradiation comprenant des moyens de mesure de l'exposition.

Also Published As

Publication number Publication date
JPH1026805A (ja) 1998-01-27
DE19608862A1 (de) 1997-09-11
EP0794536A1 (fr) 1997-09-10
US5844962A (en) 1998-12-01
DE59704742D1 (de) 2001-11-08

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