Device for accommodating an optical path component for X-ray radiation and method for providing position information

Abstract

The invention relates to a device (1) for accommodating an optical path component (K) for X-ray radiation (27), comprising: a housing (G); a linear guide (L); a slide system (W), which is arranged to accommodate the optical path component (K) and is movably mounted relative to the housing (G) by means of the linear guide (L); a coil (N), which is fixedly arranged relative to the housing (G); and a coil core (Q), which is fixedly arranged relative to the slide system (W), so that the coil core (Q) can be guided into the coil (N) by a first translation movement of the slide system (W) relative to the housing (G) and can be guided out of the coil (N) by a second translation movement of the slide system (W) relative to the housing (G).

Description

Technical Field

[0001] The invention relates to a device for accommodating a beam path component of an X-ray radiation. The invention also relates to a computer tomography device and a method for providing position information. Background Art

[0002] In a computed tomography device, the optical path components can be used, for example, for collimation, offset compensation and / or filtering, in particular to improve the image quality and / or reduce the X-ray dose. In order to determine the position, in particular the end position, of the optical path components, mechanical limit switches (which are in particular in the form of micro switches, momentary switches or relays), gratings, integrated Hall effect circuits or linear voltage differential transformers can be used, for example. However, it is problematic for conventional integrated circuits used in the region of the optical path components to determine their position, which are in particular in the form of limit and / or proximity switches, that radiation loads are caused by scattered radiation of the X-ray radiation.

[0003] DE 10 2020 214 314 B3 discloses a device for accommodating beam path components of X-ray radiation. Summary of the invention

[0004] The object of the invention is to be able to determine the position of a beam path component which is resistant to X-ray radiation. This problem is solved by the respective subject matter of the independent claims. Further advantageous aspects of the invention are considered in the dependent claims.

[0005] The invention relates to a device for accommodating a beam path component for X-ray radiation, comprising:

[0006] -case,

[0007] - linear guides,

[0008] a carriage system which is provided to receive the optical path component and which is mounted displaceably relative to the housing by means of a linear guide,

[0009] a coil which is arranged fixedly relative to the housing, and

[0010] A coil core which is arranged fixedly relative to the carriage system so that the coil core can be introduced into the coil by a first translational movement of the carriage system relative to the housing and can be removed from the coil by a second translational movement of the carriage system relative to the housing.

[0011] For example, the optical path component can be a collimator and / or an optical filter. The optical path component can, for example, have a supporting structure, and a slit plate and / or a filter plate, wherein the slit plate and / or the filter plate are detachably connected to the supporting structure of the optical path component, in particular threaded. In particular, the slide system can be arranged to accommodate the supporting structure of the optical path component. In particular, the coil core can be connected to the supporting structure of the optical path component, so that the slit plate and / or the filter plate can be connected to the supporting structure of the optical path component and / or can be loosened from the supporting structure of the optical path component when the coil core is connected to the supporting structure of the optical path component.

[0012] The coil and the coil core can be arranged in particular inside the housing and / or each designed to resist scattered radiation of X-ray radiation. Radiation-sensitive electronic components connected to the coil can be arranged, for example, outside the housing, in particular arranged to shield them from scattered radiation of X-ray radiation. It can also be provided that the electronic components connected to the coil, for example passive electronic components (in particular in the form of capacitors), are designed to be radiation-resistant and arranged inside the housing.

[0013] In particular, the second translational movement of the slide system relative to the housing can be opposite to the first translational movement of the slide system relative to the housing. In particular, the coil core can be guided into the coil so that there is no mechanical contact between the coil and the coil core. Wear can thereby be avoided.

[0014] One embodiment proposes that the shell has a first shell side, which extends flat in a first side plane located between the coil and the coil connection area, wherein the first shell side is configured to shield the coil connection area from scattered radiation of X-ray radiation from an area of ​​the slide system and directed toward the coil connection area.

[0015] In particular, it can be provided that the first housing side is provided to shield the coil connection area from scattered radiation of X-ray radiation from an area of ​​the slide system directed toward the coil connection area. In particular, the device can have a coil connection area. The coil connection area can, for example, have an interface for electrical connection, in particular for electrical plug connection, and / or can be provided for connecting electronic components, in particular electronic components of a measuring device, to the coil.

[0016] According to one embodiment, the device further comprises an electrical connection between the coil and the coil connection region, wherein the electrical connection is led through the housing, in particular through the first housing side.

[0017] According to one embodiment, the device also has a threaded shaft, a screw drive and a motor, wherein the threaded shaft is rotatably mounted relative to the housing around the spindle rotation axis, wherein the slide system is movably mounted relative to the housing parallel to the spindle rotation axis by means of a linear guide, wherein the screw drive is configured to convert a first rotational movement of the threaded shaft around the spindle rotation axis into a first translational movement of the slide system relative to the housing parallel to the spindle rotation axis, and wherein the motor is configured to drive the first rotational movement of the threaded shaft.

[0018] The screw drive can also be configured to convert a second rotational movement of the threaded shaft about the spindle rotation axis into a second translational movement of the slide system relative to the housing parallel to the spindle rotation axis. In particular, the motor can also be configured to drive the second rotational movement of the threaded shaft. In particular, it can be provided that a first side plane in which the first housing side extends flatly is substantially perpendicular to the spindle rotation axis and is located between the motor and the slide system relative to the spindle rotation axis.

[0019] Furthermore, it can be provided that the arrangement has a common connection region (for example in the form of a connector), wherein the connections for the coil are arranged next to the connections for the electric motor.

[0020] One embodiment provides that the coil is a cylindrical coil. The coil axis of the coil (eg in the form of the cylinder axis of the coil) can in particular be parallel to the linear guide and / or parallel to the spindle rotation axis. For example, the coil can be in the form of an air-core coil.

[0021] One embodiment provides that the coil core is cylindrical. The coil core can be designed, for example, in the form of a piston corresponding to a cylindrical coil. The longitudinal axis of the coil core (for example in the form of a cylindrical axis of the coil core) can in particular be parallel to the coil axis of the coil and / or to the linear guide and / or to the spindle rotation axis. In particular, the coil core can be introduced axially into the coil.

[0022] The coil core can be, for example, a magnetic core, in particular a ferrite core. The magnetic core can be made of, for example, a ferromagnetic metal alloy and / or an oxide ceramic ferrimagnetic material.

[0023] According to one embodiment, the device further comprises a measuring device which is configured to detect a measurement result which is dependent on the coil inductance.

[0024] In particular, it can be provided that the inductance of the coil depends on the position of the coil core relative to the coil. In particular, it can be provided that position information relating to the position of the slide system relative to the housing can be calculated based on the measurement results. For example, it can be provided that it can be inferred from the measurement results whether the slide system is in a reference position relative to the housing. The reference position can be, for example, an end position or adjacent to an end position, wherein the first translational movement of the slide system relative to the housing is limited beyond the end position by a collision of the slide system with a first collision region of the housing.

[0025] The device may further comprise a position information calculation unit for calculating position information based on the measurement results and / or a position information provision unit for providing position information.

[0026] One embodiment provides that the measuring device has an electrical resonant circuit, wherein the electrical resonant circuit has a coil. The resonant circuit can, for example, have an oscillating electrical circuit, in particular a series oscillating circuit or a parallel oscillating circuit. In particular, it can be provided that the resonant frequency of the electrical resonant circuit depends on the inductance of the coil and / or the measurement result depends on the resonant frequency of the electrical resonant circuit.

[0027] One embodiment provides that the measuring device has a bridge circuit, wherein the bridge circuit has a coil. The bridge circuit can in particular be a resonant bridge circuit and / or have an AC voltage bridge (for example in the form of a Maxwell bridge or a Hay bridge), wherein the AC voltage bridge has a coil.

[0028] One embodiment provides that the measuring device has an oscillation generating unit, which is configured to generate an amplitude modulated electrical oscillation, such that the amplitude of the amplitude modulated electrical oscillation depends on the inductance of the coil, wherein the measuring device has a demodulation unit, which is configured to demodulate the amplitude of the amplitude modulated electrical oscillation, such that the measurement result depends on the amplitude of the amplitude modulated electrical oscillation. The oscillation generating unit may, for example, have an electric resonant circuit and / or a bridge circuit.

[0029] One embodiment provides that the demodulation unit has a peak voltage detector. The demodulation unit may be, for example, an envelope demodulator and / or may be configured to detect peak values ​​and / or peak-to-peak values ​​of an amplitude modulated electrical oscillation.

[0030] One specific embodiment provides that the measuring device has a threshold value circuit for comparing the amplitude of the amplitude-modulated electrical oscillation with a first threshold value and / or a second threshold value, wherein the measurement result depends on the result of the comparison.

[0031] The threshold value circuit can, for example, have a comparator, in particular a comparator with a double edge, and / or a Schmitt trigger. The measurement result can, in particular, be binary and / or the measurement result can indicate, for example, whether the amplitude of the amplitude-modulated electrical oscillation has exceeded the larger of two threshold values ​​or has fallen below the smaller of two threshold values. In particular, it can be provided that the first threshold value and / or the second threshold value are selected such that the measurement result can be used to deduce whether the carriage system is in a reference position relative to the housing.

[0032] Also disclosed herein is a device for accommodating a beam path component for X-ray radiation, comprising:

[0033] -case,

[0034] - linear guides,

[0035] a carriage system which is provided to receive the optical path component and which is mounted displaceably relative to the housing by means of a linear guide,

[0036] a coil core which is arranged fixedly relative to the housing, and

[0037] - a coil which is arranged fixedly relative to the carriage system so that the coil core can be guided into the coil by a first translational movement of the carriage system relative to the housing and can be guided out of the coil by a second translational movement of the carriage system relative to the housing. The device can be designed according to one or more of the aspects described in conjunction with the device according to the invention.

[0038] The present invention also relates to a computer tomography device having:

[0039] - a radiation source for generating X-rays,

[0040] - detectors, and

[0041] - a device according to the invention for accommodating a beam path component for X-ray radiation,

[0042] wherein the housing of the device is arranged immovably relative to the radiation source and the detector and between the radiation source and the detector.

[0043] Furthermore, it can be provided that the computed tomography device has a beam path component for the x-ray radiation, wherein the beam path component is accommodated, in particular detachably accommodated, in a slide system of the device.

[0044] Furthermore, it can be proposed that the computed tomography device has a computing unit which is arranged to control and / or adjust a motor of the device based on position information relating to a target position of the optical path component relative to the radiation source and / or relative to the detector, so that a first translational movement of the slide system relative to the housing parallel to the spindle rotation axis causes the optical path component to be positioned at a target position relative to the radiation source and / or relative to the detector.

[0045] In particular, the center plane of the fan beam of X-ray radiation can be substantially perpendicular to the main shaft rotation axis. In particular, the housing can be stably arranged relative to the fan beam of X-ray radiation. When the optical path component is accommodated in the slide system, the first translational movement of the slide system relative to the housing parallel to the main shaft rotation axis can especially cause the optical path component to perform a first translational movement parallel to the main shaft rotation axis and relative to the fan jet of X-ray radiation. When the optical path component is accommodated in the slide system, the second translational movement of the slide system relative to the housing parallel to the main shaft rotation axis can especially cause the optical path component to perform a second translational movement parallel to the main shaft rotation axis and relative to the fan jet of X-ray radiation.

[0046] The invention also relates to a method for providing position information about the position of a carriage system relative to a housing of an apparatus according to the invention, the apparatus having a measuring device which is arranged to detect a measurement result dependent on the inductance of a coil, the method comprising:

[0047] - detecting a measurement result dependent on the coil inductance by means of a measuring device,

[0048] - calculate the position information based on the measurement results,

[0049] -Provide location information.

[0050] One embodiment provides that the generating unit generates an amplitude-modulated electrical oscillation, in particular by means of an oscillation, such that the amplitude of the amplitude-modulated electrical oscillation depends on the inductance of the coil.

[0051] - wherein the amplitude modulated electrical oscillation is amplitude demodulated, in particular by means of a demodulation unit, so that the measurement result depends on the amplitude of the amplitude modulated electrical oscillation.

[0052] Furthermore, it can be provided that the amplitude of the amplitude-modulated electrical oscillation is compared with a first threshold value and / or a second threshold value, in particular by means of a threshold value circuit and / or after amplitude demodulation, wherein the measurement result depends on the result of the comparison.

[0053] The position information can be calculated based on the measurement results, for example by means of a position information calculation unit. The position information can be provided, for example, by means of a position information provision unit. The computed tomography apparatus can in particular have a position information calculation unit and / or a position information provision unit.

[0054] The position information may relate in particular to the actual position of the carriage system relative to the housing. The position information may indicate, for example in binary form, whether the carriage system is in a reference position relative to the housing. The position information may be used in particular to determine the position of an optical path component. Compared to conventional solutions for position determination, the solution according to the invention allows for improved radiation resistance and cost savings.

[0055] Data, such as position information, may be provided, for example, by transmitting a signal carrying the data, and / or by writing the data on a computer-readable storage medium, and / or by displaying the data on a screen.

[0056] Within the scope of the present invention, features described with respect to different embodiments of the present invention and / or different claim categories (method, use, device, system, arrangement, etc.) may be combined to form further embodiments of the present invention.

[0057] For example, a claim relating to an apparatus may also be improved with features described or claimed in conjunction with a method, and vice versa. The functional features of a method may be realized by correspondingly designed physical components. The use of the indefinite article "a" or "an" does not exclude the possibility that the feature in question may also appear more than once. In the context of the present application, the expression "based on" may be understood in particular in the sense of the expression "using". In particular, the wording that a first feature is calculated (or: determined, generated, etc.) based on a second feature does not exclude that the first feature may also be calculated (or: determined, generated, etc.) based on a third feature. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] The present invention will be described in detail below in conjunction with embodiments with reference to the accompanying drawings, wherein the illustrations in the accompanying drawings are schematic, extremely simplified and not necessarily to scale.

[0059] Figure 1 The arrangement for receiving beam path components for x-ray radiation is shown in a top view.

[0060] Figure 2 An arrangement for receiving beam path components for X-ray radiation is shown in a cross-sectional view.

[0061] Figure 3 Display computer tomography equipment.

[0062] Figure 4 A flow chart of a method of providing location information is shown. DETAILED DESCRIPTION

[0063] Figure 1 A top view of a device 1 for receiving a beam path component K for receiving X-ray radiation 27 is shown, which has:

[0064] - housing G,

[0065] - Linear guide L,

[0066] a carriage system W which is provided to receive the optical path component K and which is movably mounted relative to the housing G by means of a linear guide L,

[0067] a coil N which is arranged fixedly relative to the housing G, and

[0068] a coil core Q which is arranged fixedly relative to the carriage system W so that the coil core Q can be guided into the coil N by a first translational movement of the carriage system W relative to the housing G and can be guided out of the coil N by a second translational movement of the carriage system W relative to the housing G.

[0069] The shell G has a first shell side G1, which extends flat in a first side plane E1 located between the coil N and the coil connection area N8, wherein the first shell side G1 is arranged to shield the coil connection area N8 from scattered rays of X-ray radiation 27, which come from an area of ​​the slide system W and are directed to the coil connection area N8.

[0070] The device also has an electrical connection NG in the form of a wire between the coil N and the coil connection region N8 , wherein the electrical connection NG is guided through the housing G.

[0071] The device 1 also has a threaded shaft S, a threaded shaft transmission device T, and a motor M, wherein the threaded shaft S is arranged to be rotatable relative to the housing G around the spindle rotation axis AS, wherein the slide system W is movably arranged relative to the housing G parallel to the spindle rotation axis AS by means of a linear guide L, wherein the screw transmission device T is configured to convert a first rotational movement of the threaded shaft S around the spindle rotation axis AS into a first translational movement of the slide system W relative to the housing G parallel to the spindle rotation axis AS, and wherein the motor M is configured to drive the first rotational movement of the threaded shaft S.

[0072] The coil N is a cylindrical coil. The coil core Q is cylindrical and can be introduced into a groove NQ of the coil N. The coil core Q is arranged fixedly relative to the slide system W and fixedly relative to the optical path component K by means of a coil core holder KQ. An opening in the form of a gap KF transparent to the X-ray radiation 27 is provided in the optical path component K.

[0073] The device 1 has a measuring device 8 which is configured to detect a measurement result which is dependent on the inductance of the coil N, wherein the measuring device 8 has an electrical resonant circuit with the coil N and / or a bridge circuit N with the coil N.

[0074] The measuring device 8 has an oscillation generating unit 81, which is configured to generate an amplitude modulated electrical oscillation, such that the amplitude of the amplitude modulated electrical oscillation depends on the inductance of the coil N. The measuring device 8 has a demodulation unit 82, which is configured to amplitude demodulate the amplitude modulated electrical oscillation, such that the measurement result depends on the amplitude of the amplitude modulated electrical oscillation. The measuring device 8 has a threshold circuit 83, which is configured to compare the amplitude of the amplitude modulated electrical oscillation with a first threshold value and / or a second threshold value, wherein the measurement result depends on the result of the comparison.

[0075] The housing G has a second housing side surface G2, which extends flatly in a second side plane E2, which is substantially perpendicular to the spindle rotation axis AS. With respect to the spindle rotation axis AS, the slide system W is located between the first side plane E1 and the second side plane E2. The linear guide L is a rail guide. The rail guide has a pair of guide rails that are respectively fixedly connected to the housing G. The slide system W has a sliding seat frame WL that slides along the guide rails. The motor M is arranged coaxially with the threaded shaft S. The coil core Q can be connected to the sliding seat frame WL of the slide system W and / or the optical path component K, for example, by means of a coil core holder KQ. In particular, the coil core Q can be connected to the slide system W so that the optical path component K can be accommodated in the slide system W and / or can be loosened from the slide system W when the coil core Q is connected to the slide system W.

[0076] The device also has a rotation angle transmitter M1 in the form of an encoder for acquiring rotation angle transmitter measurement data, which are related to the rotation angle and / or rotation angle change of the threaded shaft S around the spindle rotation axis AS, wherein the motor M is located between the rotation angle transmitter M1 and the first side plane E1 with respect to the spindle rotation axis AS, wherein the first housing side G1 is also configured to shield the rotation angle transmitter M1 from scattered rays of X-ray radiation from the region of the slide system W directed toward the rotation angle transmitter M1.

[0077] For example, in addition to the position information calculated from the measurement results, the rotary encoder measurement data can also be used to determine the position associated with the carriage system W and / or the optical path component K, in particular if the position information indicates in binary form whether the carriage system W is in a reference position relative to the housing G. In another embodiment, for a large number of possible positions of the carriage system W along the linear guide L, the position information indicates the position of the carriage system W relative to the housing G, so that the rotary encoder M1 can be omitted. To this end, for example, a calibration of the measuring device 8 can be performed to obtain a correlation between different amplitude values ​​of the amplitude modulated electrical oscillation and the corresponding position of the carriage system W along the linear guide L.

[0078] Figure 2The device 1 for accommodating a beam path component K of an X-ray radiation 27 is shown in a cross-sectional view. The beam path component K is accommodated in a carriage system W. The housing G has a housing bottom G0 extending flat in a base surface E0 substantially parallel to the spindle axis of rotation AS, wherein an opening G0 in the form of a gap transparent to the X-rays 27 is formed in the housing bottom. The housing G of the device 1 is arranged firmly relative to the fan beam F of the X-ray radiation 27.

[0079] The first translational movement of the slide system W relative to the housing G parallel to the spindle rotation axis AS can in particular cause a first translational movement of the optical path component K relative to the fan beam F of the X-ray radiation 27 parallel to the spindle rotation axis AS. The second translational movement of the slide system W relative to the housing G parallel to the spindle rotation axis AS can in particular cause a second translational movement of the optical path component K relative to the fan beam F of the X-ray radiation 27 parallel to the spindle rotation axis AS.

[0080] Figure 3 A computer tomography device 2 is shown, which has:

[0081] a radiation source 26 for generating X-ray radiation 27,

[0082] - detector 28, and

[0083] - a device 1 for receiving a beam path component K of an X-ray radiation 27,

[0084] wherein the housing G of the device 1 is arranged immovably relative to the radiation source 26 and the detector 28 between the radiation source 26 and the detector 28 .

[0085] The computer tomography device 2 also has a computing unit 35, which is configured to: control and / or adjust the motor M of the device 1 based on the position information related to the target position of the optical path component K relative to the radiation source 26 and / or relative to the detector 28, so that the second translation movement of the slide system W relative to the housing G parallel to the spindle rotation axis AS causes the optical path component K to be positioned at the target position relative to the radiation source 26 and / or relative to the detector 28. The computing unit 35 is formed by a computer 30, which has a processing system 34, a storage system 32, a data transmission interface 36, an input unit 38 and a display unit 39 in the form of a screen. The computing unit 35 can, for example, have a position information computing unit.

[0086] The computer tomography device 2 has a patient positioning device 10 for positioning a patient 13. The patient positioning device 10 has a positioning base 11 and a positioning plate 12. By means of the relative movement of the positioning plate 12 and the gantry 20, the examination region 19 of the patient 13 can be positioned in the acquisition region 4 located in the channel-shaped opening 9 of the gantry 20. The gantry has a support frame 21, a tilting frame 22 tiltably mounted relative to the support frame 21, and a rotator 24 rotatably mounted relative to the tilting frame 22. The rotator has a radiation source 26, a detector 28 and the device 1.

[0087] Figure 4 A flow chart showing a method for providing position information relating to the position of a carriage system W relative to a housing G of a device 1 is shown, the method comprising:

[0088] - detecting the V1 measurement result by means of the measuring device 8, which measurement result depends on the inductance of the coil N, - calculating the V2 position information based on the measurement result,

[0089] -Provide V3 location information.

Claims

1. A device (1) for accommodating a beam path component (K) for X-ray radiation (27), comprising: - a housing (G), - a linear guide (L), a carriage system (W) arranged to receive said optical path component (K) and to be movably mounted relative to said housing (G) by means of said linear guide (L), a coil (N) arranged fixedly relative to the housing (G) and connected to the radiation-sensitive electronic component, and a coil core (Q) arranged fixedly relative to the slide system (W) so that the coil core (Q) can be introduced into the coil (N) by a first translational movement of the slide system (W) relative to the housing (G) and can be guided out of the coil (N) by a second translational movement of the slide system (W) relative to the housing (G), The coil and the coil core are arranged inside the housing and are each designed to protect against scattered radiation from the x-ray radiation, while the radiation-sensitive electronic components are arranged outside the housing.

2. The device (1) according to claim 1, - wherein the housing (G) has a first housing side surface (G1) which extends flat in a first side plane (E1) between the coil (N) and a coil connection region (N8), - wherein the first housing side (G1) is configured to shield the coil connection area (N8) from scattered radiation of the X-ray radiation (27) from a region of the slide system (W) directed toward the coil connection area (N8).

3. The device (1) according to claim 2, further comprising an electrical connection (NG) between the coil (N) and the coil connection area (N8), wherein the electrical connection (NG) is led through the housing (G).

4. The device (1) according to any one of claims 1 to 3, further comprising a threaded shaft (S), a screw drive (T) and a motor (M), - wherein the threaded shaft (S) is rotatably mounted relative to the housing (G) about a spindle rotation axis (AS), - wherein the slide system (W) is mounted displaceably relative to the housing (G) parallel to the spindle rotation axis (AS) by means of the linear guide (L), - wherein the screw drive (T) is arranged to convert a first rotational movement of the threaded shaft (S) about the spindle rotation axis (AS) into a first translational movement of the slide system (W) relative to the housing (G) parallel to the spindle rotation axis (AS), - wherein said motor (M) is arranged to drive said first rotational movement of said threaded shaft (S).

5. The device (1) according to any one of claims 1 to 4, - wherein the coil (N) is a cylindrical coil.

6. The device (1) according to any one of claims 1 to 5, - wherein the coil core (Q) is cylindrical.

7. The device (1) according to any one of claims 1 to 6, further comprising a measuring device (8), which is an electronic component sensitive to radiation and is arranged to detect a measurement result that depends on the inductance of the coil (N).

8. The device (1) according to claim 7, - wherein the measuring device (8) has an electric resonant circuit, - wherein the electric resonance circuit has the coil (N).

9. The device (1) according to claim 7 or 8, - wherein the measuring device (8) has a bridge circuit, - wherein the bridge circuit comprises the coil (N).

10. The device (1) according to any one of claims 7 to 9, - wherein the measuring device (8) has an oscillation generating unit (81) which is configured to generate an amplitude modulated electrical oscillation such that the amplitude of the amplitude modulated electrical oscillation depends on the inductance of the coil (N), - wherein the measuring device (8) has a demodulation unit (82) which is configured to amplitude-demodulate the amplitude-modulated electrical oscillation so that the measurement result depends on the amplitude of the amplitude-modulated electrical oscillation.

11. The device (1) according to claim 10, - wherein the demodulation unit (82) has a peak voltage detector.

12. The device (1) according to claim 10 or 11, - wherein the measuring device (8) has a threshold circuit (83) for comparing the amplitude of the amplitude modulated electrical oscillation with a first threshold value and / or a second threshold value, - wherein the result of said measurement depends on the result of said comparison.

13. A computer tomography device (2) comprising: - a radiation source (26) for generating X-ray radiation (27); - a detector (28); and - a device (1) for accommodating a beam path component (K) for the X-ray radiation (27) according to any one of claims 1 to 12, - wherein the housing (G) of the device (1) is arranged immovably relative to the radiation source (26) and the detector (28) and between the radiation source (26) and the detector (28).

14. A method for providing position information relating to the position of a carriage system (W) relative to a housing (G) of a device (1) according to any one of claims 7 to 12, the method comprising: - detecting (V1) the measurement result by means of the measuring device (8), the measurement result being dependent on the inductance of the coil (N), - based on the measurement result, calculating (V2) the position information, -Providing (V3) said location information.

15. The method according to claim 14, - wherein an amplitude modulated electrical oscillation is generated such that the amplitude of the amplitude modulated electrical oscillation depends on the inductance of the coil (N), - wherein the amplitude modulated electrical oscillation is amplitude modulated such that the measurement result depends on the amplitude of the amplitude modulated electrical oscillation.

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