EP3020049B1 - X-ray inspection system with beam shutter - Google Patents

Description

Field of the invention

The invention generally relates to an X-ray inspection system with a device for closing or releasing the beam path. In particular, the invention relates to an X-ray inspection system with a closure device having a rotatable closure body with an axis of rotation arranged essentially transversely to a beam path.

Background of the invention

DE 34 30 348 A shows an X-ray shutter for terminating the X-ray exposure of an object in the event that the capacity of power supply cables to an X-ray tube still provide power or power to the X-ray tube even after a programmed exposure time. For this purpose, an exposure control is connected to a first solenoid which pulls a radiopaque slide made of lead, tungsten or uranium against the pulling force of a spring in an open position before or during the excitation of the X-ray tube, in which the closure is held by a holding pawl of a second relaxed solenoid , In the open position, a radiation window in the shutter allows X-rays to pass through. After a controller initiates X-ray generation, and as soon as a sensor detects a preset exposure threshold, the controller energizes the unstressed solenoid, which removes the retainer from the closure. The mass of the shutter and the force of the spring are selected so that the shutter can be moved from the open position to a closed position in about 1/5000 second in order to quickly interrupt the X-ray radiation.

A problem with the known closure devices, in which the closure of the beam path is effected by means of a slider which is introduced in a direction transverse to the beam path, is that the spring responsible for the required rapid actuation of the shutter can become fatigued or break over time. Furthermore, the arrangement of spring, slide, retaining pawl complex and claimed due to the linear movement of the slide relatively much installation space. In order to keep the size of the slider and thus its mass small, a close arrangement of the radiation source is required because there to be closed cross-sectional area of the Radiation is small. Finally, in the spring-actuated linear movement of the slider, a damping means to avoid rebounding of the slider at the end position necessary, ultimately the sizing of spring, slide and damping element will always represent a compromise solution.

US 5 107 530 A shows a rotary closure which is between a first position in which an X-ray path is blocked, and a second position in which the X-ray path is opened, according to the preamble of claim 1. At the known rotary closure, a closure position display with optical sensors is provided to a reliably detect rotation of the rotary closure by means of a magnetic drive in one of the first or second position. The known rotary shutter and the control of the position of the shutter are complex.

US 5,384,661 A shows a closure flap for a visual instrument of a spacecraft, wherein the closure flap is pivotable about a hinge axis between an open position and a closed position. Similar shows US 4 286 856 A a shutter rotatable about a rotary shaft for a photographic lens. In both devices, the closure flap is biased into a stable closed position by means of a spring element and can be rotated by means of a drive in an unstable open position.

US 5 054 041 A shows an X-ray collimator with a plurality of radially extending longitudinal slots of different clear height in a rotary cylinder. The width of the collimated X-ray beam is controlled by rotating the rotary cylinder with a servomotor about the longitudinal axis, by controlling over the effective for the longitudinal X-ray through the longitudinal slot effective clear height of the longitudinal slot. The inlet opening of each longitudinal slot is larger than its outlet opening.

US 4 071 771 A As the closest prior art, a rotational security shutter mechanism for use with computerized tomographic x-ray scanners of the type having a radiation source and detector mounted for movement on opposite sides of a medium such that the radiation passes through successive sections of the medium is attenuated and detected as an output , The safety lock mechanism is disposed adjacent to the exit port of the radiation source to selectively block the exit upon the occurrence of a predetermined condition. The mechanism has a housing which is attached adjacent to the outlet opening and a Passage through which the radiation can pass. A cylindrical closure member is disposed in the housing transversely of the passageway and adapted for rotational movement between a first position permitting the passage of the radiation and a second position blocking the passageway. The closure member biased to the second position may be directly moved from the second to the first position by a linear solenoid indirectly via a crank or rotary solenoid.

Summary of the invention

It is a possible object of the invention to propose an X-ray inspection system with a closure device and a method for releasing or closing the beam path of the X-ray inspection system, which has a simple construction.

This object is achieved at least in part with the features of the independent claims. Further features and details of the invention will become apparent from the dependent claims, the description and the drawings.

The core idea of the invention is to provide a rotatable closure body instead of a linearly to be moved in the beam path slider with a bistable magnetic drive as a drive means for the rotation of the closure body between a closing rotational position in which the beam path is closed, and an open-rotational position the beam path is released for the radiation to use; "Released" here means in principle that the closure body in the open rotational position for the radiation coming into use in this position transparent so at least for a certain frequency or wavelength range of the radiation is transparent, i. It may in principle continue to be material of the closure body in the beam path, which is then transparent or permeable to the radiation or at least a portion thereof.

The invention relates to an X-ray inspection system having a device for closing or releasing an X-ray path, wherein the device has a closure body which is permanently arranged in the beam path and rotatable about a longitudinal axis arranged essentially transversely to the beam path, with a material which is dense for X-ray radiation and which is in a closed position -Rotation closes the beam path, and a transparent in an open rotational position for the radiation passage; ie, compared to known slider or Blende arrangements, in which one (or more) closure element (s) translationally one (or different) direction (s) is (or) in the beam path is moved, the shutter member is in the invention permanently in the beam path, wherein there are two rotational positions, namely the closed rotational position in which it closes the beam path or ., seals against the radiation or blocks the radiation, and the open rotational position, in which the radiation or at least a part thereof can pass through the closure body substantially unhindered. Furthermore, the closure device has a drive means, which is coupled to the closure body for its rotation about the longitudinal axis between the two rotational positions. As drive means an electrical bistable magnetic drive is provided, which is adapted to move the closure body between the two rotational positions. Each of the two rotational positions corresponds to a stable position of the magnetic drive, which can keep the magnetic drive de-energized (beibe-).

• Drehen des im Strahlengang permanent angeordneten und um die im Wesentlichen quer zum Strahlengang angeordnete Längsachse drehbaren Teils des Verschlusskörpers aus dem für die Röntgenstrahlung dichten Material in eine Offen-Drehstellung, sodass der in dem Verschlusskörper ausgebildete für die Strahlung transparente Durchgang mit dem Strahlengang zur Deckung gebracht wird.
• Drehen des im Strahlengang angeordneten Verschlusskörpers in eine Geschlossen-Drehstellung, sodass der Strahlengang durch das für die Strahlung dichte Material des Verschlusskörpers verschlossen wird.
• Ausführen der jeweiligen Drehbewegungen des Verschlusskörpers zwischen den Drehstellungen mittels eines elektrischen Magnetantriebs, und stromloses Halten der jeweiligen Drehstellungen des bistabilen Magnetantriebs mittels eines dieser Drehstellung zugeordneten Permanentmagneten.

A method for enabling and sealing the X-ray path in the X-ray inspection system comprises the following steps:

• Rotating the permanently arranged in the beam path and about the longitudinal axis arranged substantially transverse to the beam rotatable part of the closure body from the dense for X-ray material in an open rotational position, so that formed in the closure body formed transparent to the radiation passage with the beam path to cover becomes.
• Rotating the closure body arranged in the beam path into a closed rotational position so that the beam path is closed by the material of the closure body that is impervious to the radiation.
• Executing the respective rotational movements of the closure body between the rotational positions by means of an electric magnetic drive, and currentless holding the respective rotational positions of the bistable magnetic drive by means of a permanent magnet associated with this rotational position.

Particularly advantageous in the device according to the invention or the method according to the invention is that particularly short switching times between the two closure states can be achieved with a combination of a rotationally actuated closure body and an electric magnetic drive.

Features and details that are described below in connection with the closure device for closing or releasing the beam path, of course, also apply in connection with the above method according to the invention and in each case vice versa, so that with respect to the disclosure of the individual invention features mutually referred to or can be.

In the closure device the drive means is a bistable electric magnetic drive, i.e. it has two stable positions. The closure device is configured such that each of the two (functional) rotational positions of the closure body corresponds in each case to one of the two stable positions of the magnetic drive, which the magnetic drive can de-energize (hold).

In other words, in the bistable embodiment, the magnetic drive can in each case hold one of two predetermined end positions, for example in each case by means of a permanent magnet installed therefor, de-energized. There may be an unstable equilibrium point between the structurally related stable end positions, with the drive being automatically moved out of the equilibrium point into the nearest stable end position upon appropriate control or deflection.

It is particularly advantageous here that this closure device has no appreciable power requirement, since the electric magnetic drive only has to be always supplied with electrical energy for rotating the closure means. Due to the only short working phases for the electric magnetic drive, this can be operated in the overload area in order to achieve maximum acceleration. It has been found that the time between movement phases is sufficient for cooling the magnetic drive, that is to say the drive warms up during the short-term overload in the working phase, but remains below the specified upper limit of the temperature. Therefore, there are substantially no particular restrictions on the heat dissipation to be ensured with respect to the installation site.

The drive means may be an electric rotary magnetic drive, but also a linear magnetic drive; if a linear magnet drive is used, the linear movement can be implemented, for example via a lever mechanism in the required rotational movement for the required movement, ie rotation of the closure body.

The electric magnet drives which are preferred for the closure device can be based essentially on the following fundamental design principle. A coil wound, for example, from copper wire forms, together with an open iron core, an electric magnet capable of performing mechanical work in the form of motion or of generating a holding force when electric current flows through the coil. As a linear drive of the magnetic drive is designed so that an anchor performs a rectilinear lifting movement in current flow. Depending on the design, the lifting movement of the armature can push or pull current flow, or both from a central position. As a rotary drive of the magnetic drive is configured so that the armature when current flows through the coil generates a purely rotational movement, similar to an electric motor on the drive shaft. In contrast to the electric motor, the armature of the rotary magnet drive can not rotate continuously, but only over a predetermined angle of rotation; the rotational movement can take place in a clockwise, counterclockwise or even in both directions, then starting from a central position.

The closure body can be installed, for example, in a device for forming the radiation. Such a forming device may be a collimator. The closure body can also be arranged as a closure directly on the housing of a device for generating the radiation. Such a radiation-generating device may be, for example, an X-ray tube for generating X-rays.

The closure body may be shaped so that in the open rotational position to the beam path directed inner surfaces of the passage are formed or extend so that they are substantially with inner the beam path bounding housing surfaces, ie housing inner surfaces, aligned or not limit the clear cross section of the beam path , Alternatively, the desired clear cross-section of the beam path can also be defined with the passage, ie the inner surfaces facing the beam path or, in the case of the closure body made of different materials, a partial area with dense material for the radiation and a partial area with at least one part the radiation transparent material, the defined interfaces determine the effective cross section of the beam path.

In certain embodiments, the closure body, at least in the region or part which is permanently in the beam path, substantially or approximately have the shape of a half-cylinder or cylinder portion.

In certain embodiments, the closure body may have substantially or approximately the shape of a solid cylinder at least in the area or part which is located in the beam path, wherein the passage may be in the closure body as a slot or window extending transversely to the longitudinal axis.

The passage may in a particularly simple case be defined by the absence of any material in the closure body, i.e. the passage in the closure body may be made free of material.

Alternatively, the passage in the closure body may be defined or formed by a correspondingly shaped material integrated into the closure body, which is transparent to the radiation. In this variant, the closure body can be inserted into a device defining the beam path so that the shutter additionally hermetically seals the beam path.

The above embodiment can be developed advantageously by the passage in the closure body is defined or formed by a correspondingly shaped and integrated into the closure body filter material, wherein the filter material is selected so that the continuous X-rays are selectively filtered.

For example, the filter material can be chosen so that the x-ray radiation is hardened defined. "Hardened" here means that low-energy X-ray quanta are absorbed by the filter material and those with high energy are transmitted as much as possible. In other words, the softer, ie longer-wavelength and less penetratable X-rays are filtered out; As a filter material can be used here, for example, aluminum, copper or the like. Furthermore, it is also possible to additionally filter out certain hard X-rays, ie short-wave and thus high-energy components of the X-ray spectrum of the X-ray radiation; as filter material For this example, a material with higher atomic number, such as zirconium, molybdenum, rhodium or the like.

The closure body and / or the drive means may be mechanically configured so that only a movement in a predetermined range is possible. For example, the two (functional) rotational positions (open / close rotational position) associated end stops can be provided on the closure body and / or the drive means, so that the closure body and the drive means is mechanically movable only in an area defined by the end stops range. As a result, the respective rotational position of the closure body can be ensured particularly precisely. In addition, elastic end stops can be provided which absorb the kinetic energy of the closure body when taking one of the (functional) rotational positions.

The closure device is configured bistable, wherein in each case the closing position and the open position of the closure device is a stable position in which the closure body is automatically held. Here, in each case for rotating the closure body of one of the two positions in the other a corresponding power supply, such as a current pulse, necessary.

Brief description of the drawing figures

Figur 1

zeigt eine Schnittansicht von oben auf reine Verschlusseinrichtung, die in einem Fächerstrahl-Kollimator integriert ist;

Figur 2a

zeigt eine Schnittansicht 2-2 der Figur 1, bei der das Verschlussmittel der Verschlusseinrichtung den Strahlengang freigibt;

Figur 2b

zeigt eine Schnittansicht 2-2 der Figur 1, bei der das Verschlussmittel der Verschlusseinrichtung den Strahlengang verschließt;

Figur 3a

zeigt eine perspektivische Ansicht eines Ausschnitts der Verschlusseinrichtung der Figur 1, in der sich der Verschlusskörper in der Offen-Drehstellung befindet; und

Figur 3b

zeigt eine perspektivische Ansicht eines Ausschnitts der Verschlusseinrichtung der Figur 1, in der sich der Verschlusskörper in der Verschließ-Drehstellung befindet.

Further advantages, features and details of the invention will become apparent from the following description in which, with reference to the drawings, embodiments of the invention are described in detail. Functionally similar or identical components or components are partially provided with the same reference numerals. The terms "left", "right", "top", "bottom" used in the description of the embodiments refer to the drawings in an orientation with normally legible figure designation or normal readable reference numerals. The embodiments shown and described are not to be understood as exhaustive enumeration, but rather have exemplary character for the description of the invention.

FIG. 1

shows a sectional view from above of pure closure device, which is integrated in a fan beam collimator;

FIG. 2a

shows a sectional view 2-2 of FIG. 1 in which the closure means of the closure device releases the beam path;

FIG. 2b

shows a sectional view 2-2 of FIG. 1 in which the closure means of the closure device closes the beam path;

FIG. 3a

shows a perspective view of a section of the closure device of FIG. 1 in which the closure body is in the open rotational position; and

FIG. 3b

shows a perspective view of a section of the closure device of FIG. 1 in which the closure body is in the closing rotational position.

Detailed description of an embodiment

The invention will be described in detail below with reference to the figures with reference to an embodiment. The detailed description is for the convenience of those skilled in the art and is not intended to be limiting. In the following For description, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be used without these specific details. Circuits, structures and methods known to those skilled in the art will not be discussed in detail here in order to avoid unnecessarily obscuring the understanding of the present description.

Terms "coupled" and "connected / connected" and terms derived from them are not used synonymously here. Rather, in specific embodiments, "connected / connected" may indicate that two or more elements are in direct physical or electrical contact with each other. "Coupled" may mean that two or more elements interact or influence each other, and they may be in direct as well as indirect physical or electrical contact with each other. Unless otherwise indicated, the use of the ordinal adjectives "first," "second," "third," etc. to denote a common object merely indicates that reference is made to various examples of like objects, and is not intended to imply that such designated objects must occur in a certain temporal, spatial, ranking or other order.

FIG. 1 shows a sectional view from above of a closure device 1, which is adjacent to a narrower end in a fan beam collimator 15 integrated to form a fan-shaped X-ray beam.

The fan-beam collimator 15 of the embodiment shown here consists essentially of two trapezoid congruent halves each having a small side 15a and a large side 15b. The halves, in the assembled state, form a beam path 3 for X-rays generated in an X-ray source (not shown) coupled to the small side 15a. The X-rays are irradiated into the beam path 3 on the small side 15a of the collimator 15 and leave it in an angular range defined by the collimator on its large side 15b.

It should be noted that the housing of the fan-beam collimator 15 does not necessarily have to be made up of two halves. For example, the housing can also be in one piece or formed integrally, ie, for example, be a one-piece casting, which has a correspondingly shaped and aligned recess, such as a matching hole for the closure body.

Adjacent to the small side 15 a, a part 5 of a closure body 9 is permanently arranged in the beam path 3. The closure body 9 is rotatably mounted in the collimator 15 at its longitudinal ends 9a, 9b about a longitudinal axis 7 extending essentially transversely to the beam path 3, by means of bearing means 16a, 16b known per se.

The closure body 9 itself, that is to say the part which serves to close the beam path 3, consists of a material which is dense for X-ray radiation, such as, for example, lead, tungsten, uranium or tantalum; Instead of tantalum, it is also possible to use niobium or zirconium or an alloy of 80% to 90% tantalum, niobium and zirconium. Alternatively, gold, ceramics, sintered materials of tungsten with copper, nickel and / or iron or the like, to name a few further examples are also suitable.

The material of the housing parts or of the housing of the collimator 15 also consists of a material that is dense for X-ray radiation, which may likewise be the elements mentioned in connection with the closure body 9 or, alternatively, steel or brass.

The closure body 9 is shaped such that by means of the closure body 9 in an open rotational position A ( FIG. 2a . 3a ) a transparent to the X-ray transmission 11 is defined. FIG. 2a shows a sectional view 2-2 of the FIG. 1 in which the closure means of the closure device releases the beam path. FIG. 3a shows a perspective view of a section of the closure device of FIG. 1 in which the closure body is in the open rotational position A.

More precisely, the part of the closure body 9, which consists of the material that is dense for X-ray radiation, substantially has the shape of a solid cylinder. The passage 11 extends with respect to the axis of rotation corresponding to the longitudinal axis 7 radially or centrally through the closure body 9. As partially based on the FIGS. 3a, 3b it can be seen that the passage 11 has a rectangular cross-section in the main direction of the beam path 3.

In the open rotational position A directed to the beam path 3 inner surfaces 17a, 17b, 17c, 17d of the passage 11 are aligned so that they are aligned with the beam path 3 bounding inner housing surfaces 19a, 19b, 19c, 19d of the fan beam collimator 15 (surfaces 17c , 17d) or define the clear cross section of the beam path 3 (surfaces 17a, 17b).

The closure body 9 is further shaped such that in a closed rotational position B (FIG. FIG. 2b . 3b ) of the closure body 9, the entire clear cross section of the beam path 3 is blocked by means of the dense for X-ray radiation material. FIG. 2b shows a sectional view 2-2 of the FIG. 1 in which the closure body 9 completely closes the beam path. FIG. 3b shows a perspective view of a section of the closure device of FIG. 1 in which the closure body is in the closing rotational position B.

A drive means 13 is coupled to the closure body 9 to rotate about the longitudinal axis 7 between the rotational positions A, B via a shaft 10. The drive means 13 is an electric bistable magnetic drive with two stable end positions, the magnetic drive in each case in the de-energized state, i. without supply of electric energy in the form of electric current, stably maintained. For example, for this purpose, at least two permanent magnets may be arranged in the magnetic drive, by means of which the magnetic drive can be kept de-energized in each case in a predetermined position. Each of the two rotational positions A, B of the closure body 9 is associated with one of these two stable positions of the magnetic drive.

In the embodiment shown, the drive means 13 is an electrical bistable rotary magnet. That is, the drive means 13 directly generates the rotational movement required for the actuation of the closure device 1. Bistable rotary magnets have fast reaction times and keep without current supply the respective predetermined stable position or end position. Since only for a short time the operation of the closure device electrical energy is needed, consuming bistable magnetic drives little energy and generate due to the short work phases only little heat loss.

On the shaft 10, which couples the rotor 1 3a of the drive means 1 3 with the closure body 9, a rotation stop element 12 is mounted in the form of a lever. On the housing of the drive means 13 are the two rotational positions A, B associated end stops 21a, 21b (the stop 21b is hidden in the illustration, but basically similar to the 21a running) so firmly arranged that the closure body 9 and the drive means 13 only in the can be moved by the two end stops 21a and 21b defined angular range, which corresponds essentially to a 90 ° rotation of the closure body 9. End stops 21a, 21b are provided with an elastic material, for example an elastomer, e.g. Material such as rubber or a rubber-like material, i. a material having elastic properties similar to rubber, provided, which absorbs the kinetic energy of the moving closure body 9 when taking one of the rotational positions A, B.

When de-energized, there is an unstable equilibrium point in the middle position between the two end stops 21a and 21b, each one of the stable operating points of the magnetic drive per direction of rotation, in which the rotor 13a automatically rotates, as soon as it is deflected from this central position in the respective direction , correspond. The torque required for this purpose is generated only for this purpose built into the magnetic drive permanent magnet. Since the end stops 21a and 21b are each located slightly in front of the stable end positions of the rotor 1 3a, the rotor 13a remains in these end positions until it is active, i. is deflected by means of power supply via the center position in the direction of the other end position.

The electric magnetic drive can be controlled, for example, via a bipolar amplifier, such as a bipolar stepper motor amplifier module. Preferably, the magnetic drive is controlled in each case between the rotational positions of the closure body 9 via a current pulse, wherein the pulse length of the current corresponds to the movement time in the respective other rotational position of the closure body 9.

On the basis of the embodiment described above, a device 1 for closing or releasing the beam path 3 for X-radiation has been explained. The invention is not limited to the embodiment described, but rather the invention results from the following claims.

Claims (11)

1. An X-ray inspection system having a device (1) for closing and opening an X-ray beam path, the device (1) having at least one part (5) of a shutter body (9) which is permanently situated in the beam path (3) and rotatable about a longitudinal axis (7) situated transversely with respect to the beam path (3), and which contains a material that is opaque to the X-ray radiation and blocks the beam path (3) when the shutter body (9) is in a closed rotary position (B), and which defines a passage (11) that is transparent to the radiation when in an open rotary position (A); and having an electromagnetic drive, as drive means (13), that is coupled to the shutter body (9) for rotation of same about the longitudinal axis (7) between the rotary positions (A, B),
   characterized in that the electromagnetic drive is configured for moving the shutter body (9) between the rotary positions (A, B), wherein the electromagnetic drive is a bistable magnetic drive, and each of the two rotary positions (A, B) respectively corresponds to one of two stable positions of the magnetic drive that maintains the magnetic drive without current.
2. The X-ray inspection system according to Claim 1,
   wherein the drive means (13) is a solenoid drive or a linear magnetic drive.
3. The X-ray inspection system according to one of Claims 1 to 2, also containing a device for shaping the radiation, or a device for generating the radiation,
   wherein the shutter body (9) is situated in this device (15) for shaping the radiation, or is situated on this device for generating the radiation.
4. The X-ray inspection system according to Claim 3, wherein the device (15) for shaping the radiation is a collimator (15) .
5. The X-ray inspection system according to Claim 3, wherein the device for generating the radiation is an X-ray tube.
6. The X-ray inspection system according to one of Claims 1 to 5,
   wherein in the open rotary position (A), inner surfaces (17a, 17b, 17c, 17d) of the passage (11) which are directed toward the beam path (3) are designed in such a way that the inner surfaces (17a, 17b, 17c, 17d)

   - are aligned with housing surfaces (19a, 19b, 19c, 19d) which delimit the beam path (3), or

   - do not limit the free cross section of the beam path (3), or

   - define the free cross section of the beam path (3).
7. The X-ray inspection system according to one of Claims 1 to 6,
   wherein the shutter body (9), at least in the area that is permanently situated in the beam path (3),

   - has the shape of a half-cylinder or cylindrical section, or

   - has the shape of a solid cylinder, the passage (11) extending essentially radially through the shutter body (9) .
8. The X-ray inspection system according to one of Claims 1 to 6,
   wherein the shutter body (9), at least in the area permanently situated in the beam path (3), has the shape of a solid cylinder, and the passage (11) extending essentially radially through the shutter body (9) has a rectangular cross section.
9. The X-ray inspection system according to one of Claims 1 to 8,
   wherein end stops (21a, 21b) associated with the two rotary positions (A, B) are provided on the shutter body (9) or the drive means (13) in such a way that the shutter body (9) or the drive means (13) is movable only in a range defined by the stops (21a, 21b), which essentially corresponds to a 90° rotation of the shutter body (9).
10. A method for closing and opening an X-ray beam path (3) of an X-ray inspection system, the method having the steps:

    rotating a part of a shutter body (9) which is permanently situated in the beam path (3) and rotatable about a longitudinal axis (7) situated essentially transversely with respect to the beam path (3), and which is made of a material that is opaque to the X-ray radiation, into an open rotary position (A), so that a passage (11) which is formed in the shutter body (9) and is transparent to the radiation is brought into alignment with the beam path (3);

    rotating the shutter body (11 [sic; (9)] situated in the beam path (3) into a closed rotary position (B), so that the beam path (3) is closed by material of the shutter body (9) that is opaque to the radiation;

    carrying out the particular rotary motions of the shutter body (9) between the rotary positions (A, B) by means of a bistable magnetic drive as drive means (13), and holding each of the rotary positions (A, B) of the drive means (13) without current by means of a permanent magnet associated with the respective rotary position (A, B) .
11. The X-ray inspection system according to one of Claims 1 to 9, having an X-ray radiation source and a control device that is operatively connected to the shutter device (1) and configured for controlling the shutter device (1) using the method according to Claim 10.

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