WO2014037251A1 - Method for operating a computer tomography system and computer tomography system - Google Patents

Method for operating a computer tomography system and computer tomography system Download PDF

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WO2014037251A1
WO2014037251A1 PCT/EP2013/067758 EP2013067758W WO2014037251A1 WO 2014037251 A1 WO2014037251 A1 WO 2014037251A1 EP 2013067758 W EP2013067758 W EP 2013067758W WO 2014037251 A1 WO2014037251 A1 WO 2014037251A1
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ray source
ray
operating mode
tomography system
operating
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PCT/EP2013/067758
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German (de)
French (fr)
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Herbert Bruder
Bernhard Krauss
Rainer Raupach
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Siemens Aktiengesellschaft
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Priority to CN201380038621.2A priority Critical patent/CN104487000B/en
Publication of WO2014037251A1 publication Critical patent/WO2014037251A1/en

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    • 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
    • A61B6/06—Diaphragms
    • 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
    • A61B6/40—Arrangements for generating radiation specially adapted for radiation diagnosis
    • A61B6/405—Source units specially adapted to modify characteristics of the beam during the data acquisition process
    • 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
    • A61B6/48—Diagnostic techniques
    • A61B6/482—Diagnostic techniques involving multiple energy imaging

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  • the invention relates to a method for operating a computer tomography system comprising an X-ray source with a first operating mode and with a second mode of operation, wherein the X-ray source rotates to investigate an object on a circular path around the object and wherein generated at several positions along the orbit projection images of the object become.
  • the invention relates to a corresponding computed tomography system.
  • Some computed tomography techniques do not use monochromatic (to a good approximation monochromatic) X-ray radiation, but multi-chromatic X-ray radiation to obtain information about an examination subject.
  • the object of the invention is to specify an improved method for operating a computer tomography system and a corresponding computer tomography system.
  • the object is achieved according to the invention by a method having the features of claim 1.
  • the method is used to operate a computer tomography system, which comprises an X-ray source with a first operating mode and a second operating mode, wherein the X-ray source rotates for examination or in the context of an examination of an object on a circular path around the object and wherein at several positions along the circular path projection images of Object to be generated.
  • the computed tomography system is set up in such a way that, after a half rotation of the X-ray source, it is changed between the operating modes, with a mobile filter either being moved in or out of a radiation field of the X-radiation source.
  • X-radiation with different intensity and / or different wavelength is preferably generated in the two operating modes. Accordingly, it is thus provided that the X-ray source, which typically comprises an X-ray tube, is initially operated in the first operating mode and during which a half-turn is performed and that the
  • X-ray source subsequently changes to the second operating mode and then performs another half-turn.
  • the X-ray source is either returned during the second half-rotation or the X-ray source leads in the sum of a complete encircling of the object to be examined.
  • the switching between the operating modes therefore does not take place between individual projection recordings, but after a multi-projection scan of the object, whereby a substantially redundant multi-projection scan of the object is made, but during which the X-ray source is in another, the second operating mode. is operated, so that the second multi-projection scanning, for example, by means of X-radiation of a different wavelength is made.
  • the second multi-projection scanning for example, by means of X-radiation of a different wavelength is made.
  • the X-ray source also comprises a drivable filter or aperture filter, for example made of tin, which is used in an operating mode for generating the X-ray radiation and is driven into a radiation field of the X-ray source, which is preferably generated by means of an X-ray tube. If the operating mode subsequently changes, the filter or aperture filter is preferably moved out again and thus not further used to generate the X-ray radiation.
  • the corresponding filter or diaphragm filter thus supplements, in particular, an X-ray tube and is introduced into the X-ray field generated by the X-ray tube in order to generate a predetermined X-ray cone in order to modify it.
  • the intensity distribution of the X-ray radiation and the absolute intensity of the X-radiation are predetermined with the aid of such a filter or aperture filter.
  • a frequency or wavelength-dependent filtering of the generated X-ray radiation can be carried out with the aid of a corresponding filter.
  • the introduction of the filter or the removal of the filter from the radiation field by means of a controllable mechanism which can be kept relatively simple, since the filter is to be moved only at each operating mode change, so twice per shift scan.
  • a separate filter or diaphragm filter is provided for each operating mode, so that a corresponding filter change takes place when the operating mode is changed.
  • the filters are then moved with, for example, the X-ray tube of the X-ray source and alternately introduced into the X-ray field generated by the X-ray tube.
  • the X-ray source orbits the object for examination several times on the circular path and there is a change between the operating modes after each half turn.
  • the object is linearly displaced relative to the X-ray source during the examination, so that the object is scanned, for example, in layers as part of a so-called spiral scan.
  • the projection images of the object of two consecutive half revolutions are redundant with respect to the scanning of the object in different operating modes of the X-ray source, so that each layer of the object is scanned twice, wherein the X-ray source during the scanning of each layer performs a half turn once in the first operating mode and once in the second operating mode performs a half turn.
  • one of the layers of the volume of the object is then alternated twice between the modes of operation.
  • the computed tomography system comprises an X-radiation source and a control unit which is set up to carry out a method according to one of the preceding claims.
  • the computed tomography system is thus designed in particular as a "single-source dual-energy" computer tomography system.
  • FIG. 1 shows a sectional view of a computer tomography system.
  • the computer tomography system 2 described below and illustrated in FIG. 1 comprises a so-called gantry 4, in which an x-ray radiation source 6 is integrated, a patient table 8 which can be displaced linearly and a control unit 10.
  • the x-ray source 6 rotates on a circular path 14 about the object 12, whereby projection images of the object 12 are generated at several positions along the circular path 14.
  • the movement of the X-ray source 6 takes place either in steps or continuously and the corresponding relative movement between the X-ray source 6 and the patient table 8 is also a linear motion superimposed perpendicular to the circular path plane, for which purpose the patient table 8 is gradually or continuously linearly moved.
  • the X-ray source 6 as well as an unillustrated but this oppositely disposed X-ray detector um- During a test, the object 12 revolves several times and after every half turn in which the x-ray source 6 covers an angular range of 180 °, switching between two operating modes for the x-ray source 6 takes place.
  • the X-ray source 6 which comprises an X-ray tube 16 and a movable diaphragm filter 18, is operated with a tube voltage of 70 kV, and the diaphragm filter 18 is in a ready position in which it is positioned outside the radiation cone generated by the X-ray tube 16 is.
  • the x-ray tube 16 is operated with a tube voltage of 140 kV and the aperture filter 18 is in an insertion position in which it is positioned in the radiation cone generated by the x-ray tube 16.
  • each slice of the volume of the object 12 is scanned by means of x-ray radiation and the scans of two consecutive half-turns in which the x-ray source 6 is operated in different operating modes are redundant in terms of scanning.
  • each layer is scanned twice, but each of the two scans is X-rayed at different wavelengths.

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Abstract

The invention relates to a method for operating a computer tomography system (2) comprising an X-ray source (6) with a first operating mode and with a second operating mode, wherein the X-ray source (6) rotates on a circular path (14) about an object (12) in order to examine the object (12). Projection recordings of the object (12) are generated at a plurality of positions along the circular path (14). There is a switch between operating modes of the X-ray source (6) after a semi-rotation, and a movable filter (18) is moved into or out of a radiation field of the X-ray source (6) when the operating mode is switched.

Description

Beschreibung description
Verfahren zum Betrieb einer Computertomographieanlage und Computertomographieanlage Method for operating a computer tomography system and computer tomography system
Die Erfindung betrifft ein Verfahren zum Betrieb einer Computertomographieanlage umfassend eine Röntgenstrahlungsquelle mit einem ersten Betriebsmodus und mit einem zweiten Betriebsmodus, wobei die Röntgenstrahlungsquelle zur Untersu- chung eines Objektes auf einer Kreisbahn um das Objekt rotiert und wobei an mehreren Positionen entlang der Kreisbahn Projektionsaufnahmen vom Objekt generiert werden. Darüber hinaus betrifft die Erfindung eine entsprechende Computertomographieanlage . The invention relates to a method for operating a computer tomography system comprising an X-ray source with a first operating mode and with a second mode of operation, wherein the X-ray source rotates to investigate an object on a circular path around the object and wherein generated at several positions along the orbit projection images of the object become. In addition, the invention relates to a corresponding computed tomography system.
Bei einigen Computertomographie-Verfahren wird keine monochromatische (in guter Näherung monochromatisch) Röntgenstrahlung, sondern multichromatische Röntgenstrahlung genutzt, um Informationen über ein Untersuchungsobjekt zu ge- winnen. Some computed tomography techniques do not use monochromatic (to a good approximation monochromatic) X-ray radiation, but multi-chromatic X-ray radiation to obtain information about an examination subject.
Verbreitet ist insbesondere die sogenannte „Dual -Energy" - Computertomographie, bei der entweder zwei Röntgenstrahlungs- quellen zum Einsatz kommen, mit denen jeweils monochromati - sehe Röntgenstrahlung generiert wird, wobei sich die Röntgenstrahlung der beiden Röntgenstrahlungsquellen hinsichtlich der Wellenlänge unterscheidet (,,Dual-Source"-CT) oder aber bei der eine Röntgenstrahlungsquelle zur Generierung von Röntgenstrahlung mit unterschiedlichen Wellenlängen genutzt wird (,,Single-Source"-CT) , wobei in diesem Fall zum Wechsel zwischen den Wellenlängen ein sogenanntes „kV-Switching" , also eine Änderung der Röhrenspannung einer Röntgenröhre, vorgenommen wird. Ausgehend hiervon liegt der Erfindung die Aufgabe zugrunde, ein verbessertes Verfahren zum Betrieb einer Computertomographieanlage und eine entsprechende Computertomographieanlage anzugeben . Bezüglich des Verfahrens wird die Aufgabe erfindungsgemäß durch ein Verfahren mit den Merkmalen des Anspruchs 1 gelöst. Die rückbezogenen Ansprüche beinhalten teilweise vorteilhafte und teilweise für sich selbst erfinderische Weiterbildungen dieser Erfindung. In particular, so-called "dual energy" computer tomography is used, in which either two x-ray sources are used, with which monochromatic x-ray radiation is generated in each case, the x-ray radiation of the two x-ray sources being different in terms of wavelength ("dual-emission"). Source "-CT) or in which an X-ray source for generating X-radiation with different wavelengths is used (" single-source "-CT), in which case the change between the wavelengths, a so-called" kV switching ", ie Changing the tube voltage of an X-ray tube is made. Proceeding from this, the object of the invention is to specify an improved method for operating a computer tomography system and a corresponding computer tomography system. With regard to the method, the object is achieved according to the invention by a method having the features of claim 1. The dependent claims include in part advantageous and in part self-inventive developments of this invention.
Das Verfahren dient zum Betrieb einer Computertomographieanlage, welche eine Röntgenstrahlungsquelle mit einem ersten Betriebsmodus und einem zweiten Betriebsmodus umfasst, wobei die Röntgenstrahlungsquelle zur Untersuchung oder im Rahmen einer Untersuchung eines Objektes auf einer Kreisbahn um das Objekt rotiert und wobei an mehreren Positionen entlang der Kreisbahn Projektionsaufnahmen vom Objekt generiert werden. Dabei ist die Computertomographieanlage derart eingerichtet, dass nach einer Halbdrehung der Röntgenstrahlungsquelle zwischen den Betriebsmodi gewechselt wird, wobei ein fahrbarer Filter entweder in ein Strahlungsfeld der Röntgenstrahlungs- quelle hinein- oder herausgefahren wird. Bevorzugt wird dabei in den beiden Betriebsmodi Röntgenstrahlung mit unterschiedlicher Intensität und/oder unterschiedlicher Wellenlänge generiert. Dementsprechend ist es also vorgesehen, dass die Röntgenstrahlungsquelle, welche typischerweise eine Röntgenröhre umfasst, zunächst im ersten Betriebsmodus betrieben wird und währenddessen eine Halbdrehung ausführt und dass dieThe method is used to operate a computer tomography system, which comprises an X-ray source with a first operating mode and a second operating mode, wherein the X-ray source rotates for examination or in the context of an examination of an object on a circular path around the object and wherein at several positions along the circular path projection images of Object to be generated. In this case, the computed tomography system is set up in such a way that, after a half rotation of the X-ray source, it is changed between the operating modes, with a mobile filter either being moved in or out of a radiation field of the X-radiation source. In this case, X-radiation with different intensity and / or different wavelength is preferably generated in the two operating modes. Accordingly, it is thus provided that the X-ray source, which typically comprises an X-ray tube, is initially operated in the first operating mode and during which a half-turn is performed and that the
Röntgenstrahlungsquelle nachfolgend in den zweiten Betriebsmodus wechselt und dann eine weitere Halbdrehung ausführt. Dabei wird die Röntgenstrahlungsquelle entweder während der zweiten Halbdrehung zurückgeführt oder aber die Röntgenstrah- lungsquelle führt in der Summe eine vollständige Umkreisung des zu untersuchenden Objektes aus. X-ray source subsequently changes to the second operating mode and then performs another half-turn. In this case, the X-ray source is either returned during the second half-rotation or the X-ray source leads in the sum of a complete encircling of the object to be examined.
Die Umschaltung zwischen den Betriebsmodi erfolgt also nicht zwischen einzelnen Projektionsaufnahmen, sondern nach einer Multi-Projektionsabtastung des Objektes, wobei in der Folge eine im Wesentlichen redundante Multi-Projektionsabtastung des Objektes vorgenommen wird, während derer jedoch die Röntgenstrahlungsquelle in einem anderen, dem zweiten Betriebsmo- dus betrieben wird, so dass die zweite Multi-Projektions- abtastung zum Beispiel mittels Röntgenstrahlung einer abweichenden Wellenlänge vorgenommen wird. Bei einer derart gestalteten Abtastung des Objektes mittels Röntgenstrahlung, wird lediglich einmal zwischen den Betriebsmodi gewechselt, so dass die technischen Anforderungen an die Computertomographieanlage bezüglich der Umschaltbarkeit zwischen den Betriebsmodi relativ gering gehalten wird. Die Röntgenstrahlungsquelle umfasst außerdem einen fahrbaren Filter oder Blendenfilter, beispielsweise aus Zinn, der bei einem Betriebsmodus zur Generierung der Röntgenstrahlung genutzt wird und dazu in ein Strahlungsfeld der Röntgenstrahlungsquelle, welches vorzugsweise mittels einer Röntgenröhre erzeugt wird, hineingefahren wird. Wechselt nachfolgend der Betriebsmodus, so wird der Filter bzw. Blendenfilter bevorzugt wieder herausgefahren und somit nicht weiter zur Generierung der Röntgenstrahlung genutzt. Der entsprechende Filter oder Blendenfilter ergänzt also insbesondere eine Rönt- genröhre und wird zur Generierung eines vorbestimmten Röntgenstrahlungskegels in das von der Röntgenröhre generierte Röntgenstrahlungsfeld eingebracht, um dieses zu modifizieren. Typischerweise wird mit Hilfe eines solchen Filters oder Blendenfilters die Intensitätsverteilung der Röntgenstrahlung sowie die absolute Intensität der Röntgenstrahlung vorgegeben. Zusätzlich oder alternativ lässt sich mit Hilfe eines entsprechenden Filters eine frequenz- oder wellenlängenabhängige Filterung der generierten Röntgenstrahlung vornehmen. Typischerweise erfolgt die Einbringung des Filters bzw. das Herausnehmen des Filters aus dem Strahlungsfeld mit Hilfe einer steuerbaren Mechanik, die relativ einfach gehalten werden kann, da der Filter nur bei jedem Betriebsmoduswechsel, also zweimal pro Schichtabtastung zu bewegen ist. In vorteilhafter Weiterbildung ist für jeden Betriebsmodus ein eigener Filter oder Blendenfilter vorgesehen, so dass bei einem Betriebsmoduswechsel auch ein entsprechender Filterwechsel erfolgt. Die Filter werden dann zum Beispiel mit der Röntgenröhre der Röntgenstrahlungsquelle mit bewegt und im Wechsel in das von der Röntgenröhre generierte Röntgenstrahlungsfeld eingebracht . The switching between the operating modes therefore does not take place between individual projection recordings, but after a multi-projection scan of the object, whereby a substantially redundant multi-projection scan of the object is made, but during which the X-ray source is in another, the second operating mode. is operated, so that the second multi-projection scanning, for example, by means of X-radiation of a different wavelength is made. In such a designed scanning of the object by means of X-rays, only once between the operating modes, so that the technical requirements for the CT system with respect to the switchability between the operating modes is kept relatively low. The X-ray source also comprises a drivable filter or aperture filter, for example made of tin, which is used in an operating mode for generating the X-ray radiation and is driven into a radiation field of the X-ray source, which is preferably generated by means of an X-ray tube. If the operating mode subsequently changes, the filter or aperture filter is preferably moved out again and thus not further used to generate the X-ray radiation. The corresponding filter or diaphragm filter thus supplements, in particular, an X-ray tube and is introduced into the X-ray field generated by the X-ray tube in order to generate a predetermined X-ray cone in order to modify it. Typically, the intensity distribution of the X-ray radiation and the absolute intensity of the X-radiation are predetermined with the aid of such a filter or aperture filter. Additionally or alternatively, a frequency or wavelength-dependent filtering of the generated X-ray radiation can be carried out with the aid of a corresponding filter. Typically, the introduction of the filter or the removal of the filter from the radiation field by means of a controllable mechanism, which can be kept relatively simple, since the filter is to be moved only at each operating mode change, so twice per shift scan. In an advantageous refinement, a separate filter or diaphragm filter is provided for each operating mode, so that a corresponding filter change takes place when the operating mode is changed. The filters are then moved with, for example, the X-ray tube of the X-ray source and alternately introduced into the X-ray field generated by the X-ray tube.
Entsprechend einer bevorzugten Verfahrensvariante umrundet die Röntgenstrahlungsquelle das Objekt zur Untersuchung mehrmals auf der Kreisbahn und es erfolgt nach jeder Halbdrehung ein Wechsel zwischen den Betriebsmodi. Weiter bevorzugt wird zudem das Objekt während der Untersuchung relativ zur Röntgenstrahlungsquelle linear verschoben, so dass das Objekt zum Beispiel im Rahmen eines sogenannten Spiralscans schichtweise abgetastet wird. Vorteilhafterweise sind dabei die Projektionsaufnahmen vom Objekt zweier aufeinanderfolgender Halbumdrehungen bei unterschiedlichen Betriebsmodi der Röntgenstrahlungsquelle hinsichtlich der Abtastung des Objektes re- dundant, so dass jede Schicht des Objektes zweimal abgetastet wird, wobei die Röntgenstrahlungsquelle während der Abtastung jeder Schicht einmal im ersten Betriebmodus eine Halbdrehung ausführt und einmal im zweiten Betriebsmodus eine Halbdrehung ausführt. Infolgedessen wird dann für jede Abtastung einer der Schichten des Volumens des Objektes zweimal zwischen den Betriebsmodi gewechselt. According to a preferred variant of the method, the X-ray source orbits the object for examination several times on the circular path and there is a change between the operating modes after each half turn. Further preferably, the object is linearly displaced relative to the X-ray source during the examination, so that the object is scanned, for example, in layers as part of a so-called spiral scan. Advantageously, the projection images of the object of two consecutive half revolutions are redundant with respect to the scanning of the object in different operating modes of the X-ray source, so that each layer of the object is scanned twice, wherein the X-ray source during the scanning of each layer performs a half turn once in the first operating mode and once in the second operating mode performs a half turn. As a result, for each scan, one of the layers of the volume of the object is then alternated twice between the modes of operation.
Von Vorteil ist dabei insbesondere eine Verfahrensvariante, bei der eine Röntgenröhre als Röntgenstrahlungsquelle zum Einsatz kommt und bei der beim Wechsel zwischen den Betriebsmodi ein Wechsel der Röhrenspannung erfolgt. Auf diese Weise lässt sich eine „Single-Source-Dual-Energy"-Computertomo- graphieanlage realisieren, bei der jede Schicht des Volumens des Objektes nacheinander mit Röntgenstrahlung zweier ver- schiedener Wellenlängen abgetastet wird. Das sogenannte „kV- Switching", also der Wechsel zwischen den Röhrenspannungen der beiden Betriebsmodi, erfolgt hierbei nur einmal während der Abtastung einer Schicht und nur zweimal pro Schicht bei der Abtastung des gesamten Volumens . Die Anforderungen an die Umschaltbarkeit der Röntgenstrahlungsquelle werden so relativ niedrig gehalten. Bezüglich der Computertomographieanlage wird die gestellte Aufgabe erfindungsgemäß durch eine Computertomographieanlage mit den Merkmalen des Anspruchs 8 gelöst. Die Computertomographieanlage umfasst eine Röntgenstrahlungs- quelle und eine Steuerungseinheit, welche zur Durchführung eines Verfahrens nach einem der vorherigen Ansprüche eingerichtet ist. Die Computertomographieanlage ist somit insbesondere als „Single-Source-Dual-Energy"-Computertomographie- anläge ausgeführt. Of particular advantage in this case is a method variant in which an X-ray tube is used as the X-ray source and in which a change in the tube voltage takes place when changing between the operating modes. In this way, a "single-source dual-energy" computer tomography system can be realized in which each layer of the volume of the object is sequentially scanned with X-radiation of two different wavelengths Switching between the tube voltages of the two operating modes, takes place only once during the scanning of a layer and only twice per layer in the scan of the entire volume. The requirements for the switchability of the X-ray source are kept relatively low. With regard to the computed tomography system, the stated object is achieved according to the invention by a computer tomography system having the features of claim 8. The computed tomography system comprises an X-radiation source and a control unit which is set up to carry out a method according to one of the preceding claims. The computed tomography system is thus designed in particular as a "single-source dual-energy" computer tomography system.
Ausführungsbeispiele der Erfindung werden nachfolgend anhand einer schematischen Zeichnung näher erläutert. Darin zeigt: FIG 1 in einer Schnittdarstellung eine Computertomographieanlage . Embodiments of the invention will be explained in more detail with reference to a schematic drawing. 1 shows a sectional view of a computer tomography system.
Die nachfolgend beschriebene und in FIG 1 dargestellte Computertomographieanlage 2 umfasst eine sogenannte Gantry 4, in welcher eine Röntgenstrahlungsquelle 6 integriert ist, einen linear verschiebbaren Patiententisch 8 sowie eine Steuerungseinheit 10. The computer tomography system 2 described below and illustrated in FIG. 1 comprises a so-called gantry 4, in which an x-ray radiation source 6 is integrated, a patient table 8 which can be displaced linearly and a control unit 10.
Zur Untersuchung eines Patienten oder Objektes 12 wird dieser bzw. dieses auf dem Patiententisch 8 positioniert und in der Folge rotiert die Röntgenstrahlungsquelle 6 auf einer Kreisbahn 14 um das Objekt 12, wobei an mehreren Positionen entlang der Kreisbahn 14 Projektionsaufnahmen vom Objekt 12 generiert werden. Die Bewegung der Röntgenstrahlungsquelle 6 erfolgt dabei entweder in Stufen oder kontinuierlich und der entsprechenden Relativbewegung zwischen der Röntgenstrahlungsquelle 6 und dem Patiententisch 8 ist zudem eine Linearbewegung senkrecht zur Kreisbahnebene überlagert, wobei hierzu der Patiententisch 8 schrittweise oder kontinuierlich li- near verschoben wird. To examine a patient or an object 12, this or this is positioned on the patient table 8, and as a result the x-ray source 6 rotates on a circular path 14 about the object 12, whereby projection images of the object 12 are generated at several positions along the circular path 14. The movement of the X-ray source 6 takes place either in steps or continuously and the corresponding relative movement between the X-ray source 6 and the patient table 8 is also a linear motion superimposed perpendicular to the circular path plane, for which purpose the patient table 8 is gradually or continuously linearly moved.
Die Röntgenstrahlungsquelle 6 sowie ein nicht dargestellter aber dieser gegenüberliegend angeordneter Röntgendetektor um- kreisen das Objekt 12 während einer Untersuchung mehrfach und nach jeder Halbdrehung, bei der die Röntgenstrahlungsquelle 6 einen Winkelbereich von 180° überstreicht, wird zwischen zwei Betriebsmodi für die Röntgenstrahlungsquelle 6 umgeschalten. The X-ray source 6 as well as an unillustrated but this oppositely disposed X-ray detector um- During a test, the object 12 revolves several times and after every half turn in which the x-ray source 6 covers an angular range of 180 °, switching between two operating modes for the x-ray source 6 takes place.
Im ersten Betriebsmodus wird die Röntgenstrahlungsquelle 6, welche eine Röntgenröhre 16 und einen verfahrbaren Blendenfilter 18 umfasst, mit einer Röhrenspannung von 70 kV betrieben und der Blendenfilter 18 befindet sich in einer Bereit- Schaftsstellung, in der dieser außerhalb des von der Röntgenröhre 16 generierten Strahlungskegels positioniert ist. Im zweiten Betriebsmodus hingegen wird die Röntgenröhre 16 mit einer Röhrenspannung von 140 kV betrieben und der Blendenfilter 18 befindet sich in einer Einsatzstellung, in der dieser im von der Röntgenröhre 16 generierten Strahlungskegel positioniert ist. In the first operating mode, the X-ray source 6, which comprises an X-ray tube 16 and a movable diaphragm filter 18, is operated with a tube voltage of 70 kV, and the diaphragm filter 18 is in a ready position in which it is positioned outside the radiation cone generated by the X-ray tube 16 is. In contrast, in the second operating mode, the x-ray tube 16 is operated with a tube voltage of 140 kV and the aperture filter 18 is in an insertion position in which it is positioned in the radiation cone generated by the x-ray tube 16.
Bei jeder Halbdrehung der Röntgenröhre 6 wird eine Schicht des Volumens des Objektes 12 mittels Röntgenstrahlung abge- tastet und die Abtastungen zweier aufeinander folgender Halbdrehungen, bei denen die Röntgenstrahlungsquelle 6 in unterschiedlichen Betriebsmodi betrieben wird, sind hinsichtlich der Abtastung redundant. Somit wird jede Schicht zweifach abgetastet, allerdings erfolgt jede der beiden Abtastungen mit Röntgenstrahlung unterschiedlicher Wellenlänge. With each half rotation of the x-ray tube 6, a slice of the volume of the object 12 is scanned by means of x-ray radiation and the scans of two consecutive half-turns in which the x-ray source 6 is operated in different operating modes are redundant in terms of scanning. Thus, each layer is scanned twice, but each of the two scans is X-rayed at different wavelengths.
Die Erfindung ist nicht auf das vorstehend beschriebene Ausführungsbeispiel beschränkt. Vielmehr können auch andere Varianten der Erfindung von dem Fachmann hieraus abgeleitet werden, ohne den Gegenstand der Erfindung zu verlassen. Insbesondere sind ferner alle im Zusammenhang mit dem Ausführungsbeispiel beschriebenen Einzelmerkmale auch auf andere Weise miteinander kombinierbar, ohne den Gegenstand der Erfindung zu verlassen. Bezugszeichenliste The invention is not limited to the embodiment described above. Rather, other variants of the invention can be derived therefrom by the person skilled in the art without departing from the subject matter of the invention. In particular, all the individual features described in connection with the exemplary embodiment can also be combined with each other in other ways, without departing from the subject matter of the invention. LIST OF REFERENCE NUMBERS
2 Computertomographieanlage2 computed tomography system
4 Gantry 4 gantry
6 Röntgenstrahlungsquelle 6 X-ray source
8 Patiententisch 8 patient table
10 Steuerungseinheit  10 control unit
12 Objekt  12 object
14 Kreisbahn  14 circular path
16 Röntgenröhre 16 x-ray tube
18 Fahrbarer Blendenfilter  18 Mobile diaphragm filter

Claims

Patentansprüche claims
1. Verfahren zum Betrieb einer Computertomographieanlage (2) umfassend eine Röntgenstrahlungsquelle (6) mit einem ersten Betriebsmodus und mit einem zweiten Betriebsmodus, wobei die Röntgenstrahlungsquelle (6) zur Untersuchung eines Objektes (12) auf einer Kreisbahn (14) um das Objekt (12) rotiert und wobei an mehreren Positionen entlang der Kreisbahn (14) Projektionsaufnahmen vom Objekt (12) generiert werden, A method for operating a computer tomography system (2) comprising an X-ray source (6) having a first operating mode and a second operating mode, wherein the X-ray source (6) for inspecting an object (12) on a circular path (14) around the object (12 ) and wherein at several positions along the circular path (14) projection images of the object (12) are generated,
dadurch gekennzeichnet, dass nach einer Halbdrehung zwischen den Betriebsmodi der Röntgenstrahlungsquelle (6) gewechselt wird, wobei ein fahrbarer Filter (18) entweder in ein Strahlungsfeld der Röntgenstrahlungsquelle (6) hinein- oder herausgefahren wird. characterized in that after a half-rotation between the operating modes of the X-ray source (6) is changed, wherein a movable filter (18) either in a radiation field of the X-ray source (6) is moved in or out.
2. Verfahren nach Anspruch 1, 2. The method according to claim 1,
dadurch gekennzeichnet, dass die Röntgenstrahlungsquelle (6) für jeden Betriebsmodus einen fahrbaren Filter (18) um- fasst, wobei jeder fahrbare Filter (18) für den entsprechen- den Betriebsmodus in das Strahlungsfeld der Röntgenstrahlungsquelle (6) hinein- und beim Wechsel in einen anderen Betriebsmodus herausgefahren wird. characterized in that the x-ray radiation source (6) comprises a mobile filter (18) for each operating mode, each mobile filter (18) for the corresponding operating mode into the radiation field of the x-ray source (6) and during the change into a other operating mode is moved out.
3. Verfahren nach Anspruch 1 oder 2 , 3. The method according to claim 1 or 2,
dadurch gekennzeichnet, dass die Röntgenstrahlungsquellecharacterized in that the X-ray source
(6) das Objekt (12) zur Untersuchung mehrmals auf der Kreisbahn (14) umrundet und dass nach jeder Halbdrehung zwischen den Betriebsmodi der Röntgenstrahlungsquelle (6) gewechselt wird . (6) the object (12) for investigation several times on the circular path (14) orbits and that after every half turn between the operating modes of the X-ray source (6) is changed.
4. Verfahren nach einem der Ansprüche 1 bis 3, 4. The method according to any one of claims 1 to 3,
dadurch gekennzeichnet, dass das Objekt (12) zur Untersuchung zusätzlich relativ zur Röntgenstrahlungsquelle (6) linear verschoben wird. characterized in that the object (12) is additionally displaced linearly relative to the X-ray source (6) for examination.
5. Verfahren nach einem der Ansprüche 1 bis 4, 5. The method according to any one of claims 1 to 4,
dadurch gekennzeichnet, dass die Projektionsaufnahmen vom Objekt (12) zweier aufeinander folgender Halbdrehungen redundant sind. characterized in that the projection recordings of the object (12) of two consecutive half-turns are redundant.
6. Verfahren nach einem der Ansprüche 1 bis 5, 6. The method according to any one of claims 1 to 5,
dadurch gekennzeichnet, dass die Röntgenstrahlungsquelle (6) eine Röntgenröhre (16) umfasst und dass bei jedem Betriebsmodus eine unterschiedliche Röhrenspannung vorgegeben wird. characterized in that the X-ray source (6) comprises an X-ray tube (16) and that in each operating mode, a different tube voltage is specified.
7. Computertomographieanlage (2) umfassend eine Röntgenstrahlungsquelle (6) und eine Steuerungseinheit (10) , welche zur Durchführung eines Verfahren nach einem der vorherigen Ansprüche eingerichtet ist. 7. Computed tomography system (2) comprising an X-ray source (6) and a control unit (10), which is adapted to carry out a method according to one of the preceding claims.
PCT/EP2013/067758 2012-09-04 2013-08-28 Method for operating a computer tomography system and computer tomography system WO2014037251A1 (en)

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