DE102013227060B4 - Rotating frame for the gantry of a computer tomograph, as well as gantry and computer tomograph with such a rotating frame - Google Patents

Abstract

Rotary frame (4) for the gantry (1) of a computer tomograph, comprising a cylindrical base body (14) with a central axis of rotation (5), and comprising a reinforcement frame with at least two annular reinforcing elements (15), the reinforcing elements (15) outside the base body (14) and are arranged concentrically to the central axis of rotation (5), the reinforcing elements (15) being connected to the base body (14) in such a way that the reinforcing elements (15) are designed to absorb centrifugal forces acting on the base body (14) are.

Description

The invention relates to a rotating frame for the gantry of a computer tomograph, a gantry for a computer tomograph and a computer tomograph. A computer tomograph is designed for the X-ray generation of images, in particular sectional images. Computer tomographs are mainly used in medical imaging, but are also used in non-destructive material testing and other technical areas. The images are reconstructed from measurement data, the measurement data comprising projections from a large number of different projection directions. To record the projections from different projection directions, an X-ray source and an X-ray detector interacting with the X-ray source rotate around a recording area. When setting up a computer tomograph, all components that are to be rotatable are used in a so-called rotating frame, in particular the X-ray source and the X-ray detector. Such a rotating frame is also referred to as a “drum” or rotatable part of the gantry of a computer tomograph. This rotating frame is rotatably mounted in a gantry housing. The gantry housing also has a fixed support frame to which cladding elements or flow plates are attached. The rotating frame is in turn rotatably mounted in this support frame, for example by means of a roller bearing or by means of a magnetic bearing.

In order to avoid movement artifacts in the reconstructed image, which can arise due to movements in the recording area, efforts are made to select the time window for recording the projections required for reconstruction as small as possible through high rotation speeds. The current computed tomography devices reach speeds of 240 rpm. In the future, however, the speeds are to be increased to at least 300 rpm. Due to the combination of high speed, large rotation radius and high rotational mass, the rotating frame is a mechanically highly stressed component which, in addition to absorbing the stresses that occur, also has to guarantee that the positions of the X-ray source and X-ray detector are maintained, since position shifts of the components in the sub-millimeter range already lead to significant impairment the picture quality. Essential requirements for the rotating frame are accordingly high stability, in particular high strength and rigidity, in order to keep deformations of the rotating frame and thus the positional shifts of the components for recording the projections as low as possible.

The rotating frame is therefore regularly manufactured as a cast metal, in particular as a cast aluminum. The increase in the stability of the rotating frame through a more massive construction of the rotating frame, however, also results in a higher cost of materials and a higher weight. Then components for driving the rotor as well as the gantry housing would have to be adapted to the greater weight forces and the resulting greater centrifugal forces. In DE 10 2008 036 019 A1 it is therefore proposed to manufacture the rotating frame from a composite material reinforced with particles with a metal matrix.

Out US 8 101 933 B2 A medical device is known, having a rotating frame mounted rotatably about a substantially horizontal axis of rotation and a support frame mounted rotatably about a substantially vertical axis of rotation.

Out JP 2000 140 134 A is a rotating frame for a gantry of a radiation therapy device, comprising a reinforcing frame with a central axis of rotation, the reinforcing frame having at least two annular reinforcing elements arranged concentrically to the central axis of rotation and cross members oriented along the central axis of rotation.

It is therefore the object of the present invention to specify how the rotating frame of the gantry of a computer tomograph can be designed in a technically simple manner. This object is achieved by a rotating frame according to claim 1 and also according to claim 2, by a gantry according to claim 8, and by a computer tomograph according to claim 11.

The invention is based on the knowledge that a rotating frame must be designed to be stable, especially in the direction of the centrifugal forces acting during rotation. Furthermore, the inventors have recognized that with a sufficiently firm and stiff annular or cylindrical reinforcement frame, the centrifugal forces can bring about a stabilization of components which are attached to the inside of the reinforcement frame. Therefore, according to a first variant, the inventors propose to build the rotating frame for the gantry of a computer tomograph on a cylindrical base body with a central axis of rotation. The stability of this base body is increased by a reinforcement frame with at least two ring-shaped reinforcement elements, the reinforcement elements being arranged outside the base body and concentrically to the central axis of rotation. The reinforcement elements are connected to the base body in such a way that the reinforcement elements are used to hold onto the base body acting centrifugal forces are designed. The first variant of the solution according to the invention is technically particularly easy to implement.

Furthermore, the annular reinforcing elements do not extend over the entire extent of the cylindrical base body along the axis of rotation. Therefore, material is saved compared to a conventional solid construction, so that the rotating frame according to the invention has a particularly low weight. A rotating frame according to the invention can therefore be designed in such a way that it can achieve particularly high speeds due to its particularly high stability and comparatively low weight.

The stability of the rotating frame, in particular with respect to forces which can cause the rotating frame to twist, is further increased by arranging cross members at least partially between the base body and the reinforcing elements, the cross members being oriented along the central axis of rotation. The cross members serve on the one hand to distribute centrifugal forces acting on the base body to the reinforcing elements, but on the other hand also to absorb forces which, without the cross members, could lead to twisting of the rotating frame.

In a second variant of the invention, the cylindrical base body of the rotating frame can be dispensed with. In this case, the reinforcement frame comprises at least two ring-shaped reinforcement elements arranged concentrically to a central axis of rotation and cross members oriented along the central axis of rotation. The reinforcement elements are connected to the cross members in such a way that the reinforcement elements are designed to absorb centrifugal forces acting on the cross members. Due to the lattice-like structure, which is formed by the reinforcement elements and the cross members, the reinforcement frame has sufficient stability even without a cylindrical base body. This second variant of the solution according to the invention is also technically simple to implement and allows a rotating frame to be produced with a particularly low weight.

The reinforcement frame is designed in such a way that the reinforcement elements are positively connected to the cross members. As a result, the reinforcement frame and thus also the rotating frame have a particularly high level of stability.

Furthermore, the crossbeams each have first cutouts on the side facing the reinforcement elements, the reinforcement elements having second cutouts at connection points to the crossbeams, so that a plug connection is formed between the reinforcement elements and the crossbeams. Such a plug connection is technically simple to implement and offers in particular the advantage of simple assembly of the rotating frame with high stability at the same time.

It is further provided that the rotating frame can have at least one adapter for integrating electronic components within the reinforcing frame. Such an adapter allows an electronic component required for a tomographic recording, such as an X-ray source or an X-ray detector, to be integrated into the rotating frame in a technically simple manner.

According to a further aspect of the invention, at least one reinforcement element is designed as a rotor of an electric motor. This results in a further weight advantage, since a drive component, namely the rotor, simultaneously fulfills the function of stabilizing the rotating frame as part of the reinforcement frame.

The invention further comprises a gantry for a computer tomograph with a rotating frame according to the invention and a support frame, the rotating frame being rotatably mounted on the support frame via an external bearing. Alternatively, the rotating frame can be rotatably mounted on the support frame via an inner bearing. With both types of storage, the low weight of the rotating frame according to the invention has an advantageous effect on the design of the gantry and in particular of the support frame. Because of the low weight of the rotating frame, the forces acting on the support frame are lower, so that the support frame of a gantry according to the invention can also be manufactured with less material expenditure than a conventional support frame.

One aspect of the invention relates to a gantry with drive elements, the drive elements being designed to set the rotating frame in a rotational movement about the central axis of rotation by means of a belt drive. Such a belt drive is particularly easy to implement technically. This embodiment of a gantry thus represents a technically particularly simple and at the same time stable, reliable and cost-effective solution.

If the rotating frame is designed in such a way that it achieves particularly high speeds due to its particularly high stability and comparatively low weight, then this enables the computer tomograph to record images with a higher time resolution.

The invention is described and explained in more detail below using the exemplary embodiments shown in the figures.

• 1 einen erfindungsgemäßen Computertomographen,
• 2 einen Drehrahmen gemäß der ersten Variante der Erfindung,
• 3 einen Drehrahmen gemäß der zweiten Variante der Erfindung,
• 4 einen Verstärkungselement im Querschnitt,
• 5 einen Drehrahmen mit einem Querträger im Längsschnitt,
• 6 einen Drehrahmen ohne Querträger im Längsschnitt,
• 7 einen Drehrahmen mit einem Querträger und mit zentral angeordnetem Außenlager im Längsschnitt,
• 8 einen Drehrahmen mit einem Querträger und mit seitlich angeordnetem Außenlager im Längsschnitt,
• 9 einen Drehrahmen mit einem Querträger und mit einem Innenlager im Längsschnitt,
• 10 einen Drehrahmen mit einem Querträger und mit einem Adapter zur Integration von elektronischen Komponenten im Längsschnitt,
• 11 ein Verstärkungselement mit umwickelten Kupferleitungen im Querschnitt, und
• 12 einen Drehrahmen mit Querträger sowie mit einem elektromotorischen Antrieb im Längsschnitt.

Show it:

• 1 a computer tomograph according to the invention,
• 2 a rotating frame according to the first variant of the invention,
• 3 a rotating frame according to the second variant of the invention,
• 4th a reinforcement element in cross section,
• 5 a rotating frame with a cross member in longitudinal section,
• 6th a rotating frame without crossbeams in longitudinal section,
• 7th a rotating frame with a cross member and a centrally located external bearing in longitudinal section,
• 8th a rotating frame with a cross member and a side bearing in a longitudinal section,
• 9 a rotating frame with a cross member and an inner bearing in longitudinal section,
• 10 a rotating frame with a cross member and an adapter for integrating electronic components in a longitudinal section,
• 11 a reinforcement element with wrapped copper lines in cross section, and
• 12th a rotating frame with cross member and with an electric motor drive in longitudinal section.

1 shows a computer tomograph according to the invention. The computer tomograph includes a gantry 1 with a rotating frame 4th . In the rotating frame 4th are an X-ray source in the example shown here 8th and one with the x-ray source 8th cooperating X-ray detector 9 integrated. The rotating frame 8th rotates around a longitudinal axis while recording X-ray projections 5 , and the X-ray source 8th emits X-rays during exposure 2 in the form of an X-ray beam. In particular, the x-ray beam can be shaped as a fan or a cone. The computer tomograph can also have more than just one X-ray source 8th and more than just an X-ray detector 9 have to enable recordings in the so-called dual energy process. At the X-ray source 8th In the example shown here, it is an X-ray tube. With the X-ray detector 9 In the example shown here, it is a line detector with several lines, for example with 128 lines or with 256 lines.

When rotating the rotating frame 4th X-ray projections can be recorded from different directions, which can be reconstructed into a high-resolution, three-dimensional image. In the example shown here, a patient is lying when the X-ray projections are recorded 3 on a patient couch 6th that is connected to a bed base in such a way that it supports the patient bed 6th with the patient 3 wearing.

The patient couch 6th is designed for the patient 3 along a receiving direction through the opening 10 the gantry 1 proceed. The recording direction is usually through the axis of rotation 5 of the rotating frame 4th given. However, the axis of rotation can 5 also opposite the direction of exposure along which the patient is 3 is moved during the recording, be tilted, for example by the rotating frame 4th is designed as part of a tiltable gantry.

In the example shown here, the computed tomograph also includes a computer 12th , which is designed, for example, to control the computer tomograph and to store and process a large number of X-ray projections. The computer 12th is with an output unit 11 , for example connected to the graphic output of tomographic images. At the output unit 11 it is, for example, an LCD, plasma or OLED screen. Furthermore is the computer 12th with an input unit 13th connected. With the input unit 13th it is, for example, a keyboard, a mouse, a so-called touchscreen or a microphone for voice input. Interfaces 7th enable the computer 12th with the computer tomograph as well as with the input unit 13th or an output unit 11 to be able to communicate. With the interfaces 7th it concerns generally known hardware or software interfaces, for example the hardware interfaces PCI bus, USB or Firewire.

2 shows a rotating frame according to the first variant of the invention. In the embodiment of the first variant of the invention shown here, the rotating frame comprises 4th a cylindrical body 4th as well as three annular reinforcing elements 15th which are concentric to the axis of rotation 5 of the main body 4th are arranged. Furthermore, the reinforcing elements 15th the same outer radius and essentially the same inner radius. The inner radius of the reinforcement elements 15th only know about the connection points to the cross members 16 deviations from a fixed value due to internal recesses. The reinforcement elements 16 can like here shown, elongated and provided with flat, straight surfaces. In various embodiments of the invention, the reinforcement elements are 16 essentially cuboid, with deviations from the cuboid shape due to recesses at the connection points to the reinforcement elements 15th or a slightly curved and attached to the outer surface of the base body 14th adapted contour can be justified. The two reinforcement elements 15th shape together with those in the direction of the axis of rotation 5 oriented cross members 16 a reinforcement frame, which is outside the body 14th is arranged. The cross members 16 are in that sense in the direction of the axis of rotation 5 oriented that the axis of its longest extension is in the direction of the axis of rotation 5 are oriented, in particular this longest axis can be oriented parallel to the axis of rotation. This reinforcement frame forms a grid-like structure and stands with the base body 14th connected in such a way that upon rotation about the axis of rotation 5 on the main body 14th acting centrifugal forces can be transmitted at least partially to the reinforcement frame. The cross members 16 can be firmly attached to the base body using joining techniques such as welding or gluing 14th be connected.

The basic body 14th is typically made from sheet metal, for example sheet steel. Alternatively, the base body 14th can also be made from a semi-finished product. The thickness of a body 14th may vary between less than one millimeter and several millimeters in various embodiments. According to one aspect of the invention, the thickness of the base body is 14th one to two millimeters. With the established aluminum casting process, a comparable cylindrical element of a conventional rotating frame is many times thicker. For technical reasons, an aluminum casting is usually at least 15 millimeters thick. Even taking into account the low density of aluminum compared to sheet steel, the construction according to the invention has a considerable weight advantage. The basic body 14th can, as in 2 shown forming a complete cylinder; in further embodiments, the base body 14th however, have recesses and / or holes in its cylindrical basic shape, for example in order to be able to attach power lines, coolant lines and further supply channels between elements attached inside and outside of the base body in a simple manner.

The basic body 14th can furthermore be made of a non-metallic material, for example carbon fiber, composite material or plastic. The basic body 14th must have sufficient stability so that it does not operate during the operation of the rotating frame 4th tears or deforms so badly that it results in artifacts in the imaging process. The exact stability of the main body 14th , especially the exact strength and stiffness, depends on the design of the reinforcement frame. The material of the base body 14th and its thickness also depend on the diameter of the base body 14th with a large diameter typically associated with a particularly stable material and / or a high thickness. In the field of medical imaging, the diameter of the base body is 15th and the reinforcement frame in about 1 to 1.6 meters, with both larger and smaller diameters can be realized in further embodiments of the invention.

The reinforcement elements 15th have a higher stability than the main body 14th on. That is why the reinforcing elements 15th preferably made in one piece, i.e. without welding, gluing or any other joining technique. However, several one-piece reinforcing elements can also be used 15th be connected to each other, see for example 12th . The reinforcement elements 15th can be made from a cast metal, for example cast aluminum, or by a milling process. The typical expansion of a reinforcement element 15th along the axis of rotation 5 is about one to two centimeters. If a particularly high level of stability is required, the expansion of the reinforcing elements 15th along the axis of rotation 5 also be bigger. The reinforcing elements carry in the radial direction 15th typically a few centimeters. In a particularly stable embodiment of the invention, the reinforcing elements carry 15th more than 10 centimeters.

3 shows a rotating frame according to the second variant of the invention. In this second variant of the invention, a cylindrical base body is used 14th waived. The rotating frame 4th then has a reinforcement frame with at least two reinforcement elements 15th and several cross members 16 , the reinforcing elements 15th such with the cross members 16 connected that the reinforcing elements 15th to accommodate on the cross member 16 acting centrifugal forces are designed. For this purpose, there is at least a part of the cross member 16 on the inside of the reinforcement elements 15th .

In a typical embodiment of the second variant of the invention, the reinforcing elements have 15th the same outside diameter and essentially the same inside diameter. Will be more than two reinforcement elements 15th used, these can be along the axis of rotation 5 have the same distance from one another, so that the centrifugal forces are transferred as uniformly as possible from the base body 14th or from the Cross members 16 on the reinforcement elements 16 is guaranteed. Furthermore, the cross members 16 and the reinforcement elements 15th be firmly connected to one another by joining techniques such as welding or gluing in order to ensure the stability of the reinforcement frame and thus of the rotating frame 4th to increase.

The cross members 16 can as well as the reinforcement elements 15th be made of a cast metal and must have a high stability. The cross members 16 typically extend over the entire extent of the base body 14th along the axis of rotation 5 . Regardless of whether the rotating frame 4th a base body 14th has or not, the cross members can 16 the same extent along the axis of rotation 5 have or even be designed essentially identically, so that the most uniform possible power transmission from the cross members 16 on the reinforcement elements 15th is made possible.

4th shows a reinforcement element in cross section, that is to say with a section through a plane perpendicular to the axis of rotation 5 . In the embodiment shown here, the reinforcing element 15th on its inside rectangular recesses in a regular arrangement. The recesses are dimensioned in such a way that a perfectly fitting arrangement of a cross member 16 in a recess of the reinforcement element 15th is possible. Such a reinforcement element 15th can in a further development of the rotating frame according to the invention 4th used with the cross member 16 each on the reinforcement elements 15th facing side have first recesses, so that a form-fitting plug connection between the reinforcement elements 15th and the cross members 16 can be formed. Such a form-fitting plug connection is technically particularly easy to implement and enables the rotating frame 4th to be particularly stable.

The recesses can in further embodiments of the reinforcement element 15th also have shapes other than rectangular, for example they can be trapezoidal in cross-section. Furthermore, the recesses can be arranged irregularly, for example because in a certain area of the rotating frame 4th higher centrifugal forces are to be expected than in other areas, so that in the specific area a higher density of plug connections with cross members 16 is desirable. Higher centrifugal forces are to be expected, for example, if a particularly heavy electronic component is integrated in a certain area.

5 shows a rotating frame with a cross member in longitudinal section. Both the in 2 dashed line V as well as the central axis of rotation 5 in the cutting plane. In the example shown here, the reinforcement elements carry 15th - measured against the distance from the axis of rotation 5 - just as high as the cross members 16 . In further embodiments, the reinforcing elements 15th and the cross members 16 also apply different heights, in principle both the reinforcement elements 15th as well as the cross members 16 can apply higher. Higher-rise reinforcement elements 15th can be beneficial if the reinforcing elements 15th are designed as part of a bearing, as shown in in 7th to 9 the examples described is the case. In the in 5 The illustrated example are the reinforcement elements 15th as well as the cross members 16 connected by plug connections. Furthermore are the cross members 16 firmly to the main body 14th connected so that the plug connections are formed positively.

6th shows a rotating frame without cross member in longitudinal section. Both the in 2 dashed line VI as well as the central axis of rotation 5 in the cutting plane. In the embodiment shown here, the reinforcement elements are 15th firmly to the main body 15th connected, making the rotating frame 4th receives a particularly high stability. In further embodiments, between the base body 4th and the reinforcement elements 15th a connecting element can also be attached, in particular for connecting the reinforcing element 15th with the main body 14th .

7th shows a rotating frame with a cross member and with a centrally arranged outer bearing in longitudinal section. The outer bearing shown here is a wire roller bearing, the spherical roller bodies 23 such between the central reinforcement element 15th and the central frame 25a , which is firmly attached to the support frame of the gantry 1 is connected, are arranged so that the rolling elements 23 a rotation of the rotating frame 4th around the axis of rotation 5 enable. The wires 26th extend along the central reinforcement element 15th around the axis of rotation 5 and form a cage in which the rolling elements 23 to run. The construction shown here is lightweight and very inexpensive.

8th shows a rotating frame without cross member and with a laterally arranged external bearing in longitudinal section. The outer bearing comprises two wire race bearings with the rolling elements 23 and the wires 26th each showing the rotation of two decentralized reinforcement elements 15th and thus the rotating frame 4th around the axis of rotation 5 enable. The decentralized frame is here 25b firmly to the support frame of the gantry 1 connected. The construction shown here has the advantage of a particularly great stability of the rotational movement. In further embodiments, more than two wire roller bearings can also be used.

9 shows a rotating frame with a cross member and with an inner bearing in longitudinal section. The inner reinforcement element 15th is in the example shown here by means of a rolling bearing with rolling elements 23 and the inner frame 25c for rotation around the axis of rotation 5 designed. The rotational movement is brought about by a belt drive, the bearing surface for the belt through the surface of the inner reinforcing element, which is profiled transversely to the sectional plane shown here 15th is shown. Such a surface is particularly suitable for interacting with a V-belt. The V-belt transmits the rotational movement of a motor to the rotating frame 4th . Alternatively, the surface of the inner reinforcing element 15th have transverse ribs along the sectional plane shown here, whereby the reinforcing element 15th can interact particularly well with a toothed belt for transmitting the rotational movement. Furthermore, the and other types of mounting shown here, such as magnetic mounting, can basically be combined with one another with different drive types such as belt drive or an electric motor drive. In particular, the various forms of storage and drive can be combined with a rotating frame 4th with base body 14th as well as without a body 14th realize.

10 shows a rotating frame with a cross member and with an adapter for integrating electronic components.

An electronic component can be an X-ray source 8th , an X-ray detector 9 or other components supplied with power, which are necessary for recording a tomographic image. The adapter 19th is designed so that on the one hand it is firmly attached to the base body 14th or the reinforcement frame, and that on the other hand, a certain electronic component in the rotating frame 4th can integrate. The adapter 19th at least partially comprise the electronic component and / or its shape can be adapted to the respective electronic component. In particular, the adapter 19th be firmly connectable to an electronic component. Furthermore, the adapter 19th be designed to provide a connection, for example for an electronic power supply, for the electronic component integrated in each case.

11 shows a reinforcement element with wrapped copper wires. The reinforcement element shown here 15th is with copper wires 26th wrapped around the reinforcing element 15th as a rotor 20th an electric motor can be used. Materials other than copper can also be used for wrapping the reinforcement element 15th are used, which are suitable for the reinforcement element 15th as a rotor 20th to train an electric motor.

12th shows a rotating frame with an electric motor drive. The electric motor drive is based on a stator 21 as well as a rotor 20th , with the rotor 20th several interconnected reinforcement elements 15th includes. The individual reinforcement elements 15th are made of so-called electrical sheet, which is soft magnetic and is usually made of steel. However, other suitable materials for the production of the individual sheets can also be used 27 come into use. Which become a reinforcing element 15th joined sheets 27 are, as in 10 shown with a wire 26th wrapped around. The design of a rotor 20th through several sheets 27 instead of going through a massive core with advantageous magnetic properties 20th of the rotor 20th hand in hand. In particular, by connecting several sheets 27 Eddy currents avoided. The stator 21 is fixed to the support frame of the gantry 1 connected.

The person skilled in the art understands that the various exemplary embodiments described here can in principle be combined with one another, provided that it appears technically sensible to the person skilled in the art.

Claims (11)

Rotary frame (4) for the gantry (1) of a computer tomograph, comprising a cylindrical base body (14) with a central axis of rotation (5), and comprising a reinforcement frame with at least two annular reinforcing elements (15), the reinforcing elements (15) outside the base body (14) and are arranged concentrically to the central axis of rotation (5), the reinforcing elements (15) being connected to the base body (14) in such a way that the reinforcing elements (15) are designed to absorb centrifugal forces acting on the base body (14) are. Rotating frame (4) for the gantry (1) of a computer tomograph, comprising a reinforcing frame with a central axis of rotation (5), the reinforcing frame having at least two annular reinforcing elements (15) arranged concentrically to the central axis of rotation (5) and along the central axis of rotation (5) oriented crossbeams (16), the reinforcing elements (15) being connected to the crossbeams (16) in such a way that the reinforcing elements (15) for receiving onto the crossbeams (16) acting centrifugal forces are designed, wherein the reinforcing elements (15) are positively connected to the crossbeams (16), the crossbeams (16) each having first recesses on the side facing the reinforcing elements (15), the reinforcing elements (15) having second recesses Have connection points to the cross members (16) so that a plug connection is formed between the reinforcing elements (15) and the cross members (16). Rotating frame (4) Claim 1 , further comprising cross members (16) arranged at least partially between the base body (14) and the reinforcing elements (15), the cross members (16) being oriented along the central axis of rotation (5). Rotating frame (4) Claim 3 , wherein the reinforcing elements (15) are positively connected to the cross members (16). Rotating frame (4) Claim 4 , the cross members (16) each having first recesses on the side facing the reinforcing elements (15), the reinforcing elements (15) having second recesses at connection points to the cross members (16) so that a plug-in connection between the reinforcing elements (15) and the cross members (16) is formed. Rotating frame (4) according to one of the Claims 1 to 5 comprising at least one adapter (19) mounted within the reinforcement frame for integrating electronic components. Rotating frame (4) according to one of the Claims 1 to 6th , wherein at least one reinforcing element (15) is designed as a rotor (20) of an electric motor. Gantry (1) for a computer tomograph, comprising a rotating frame (4) according to one of the Claims 1 to 7th and a support frame, the rotating frame (4) being rotatably mounted on the support frame via an external bearing. Gantry (1) for a computer tomograph, comprising a rotating frame (4) according to one of the Claims 1 to 7th and a support frame, the rotating frame (4) being rotatably mounted on the support frame via an inner bearing. Gantry (1) for a computer tomograph, comprising a rotating frame (4) according to one of the Claims 1 to 6th wherein the gantry has drive elements, the drive elements being designed to set the rotating frame (4) in a rotational movement about the central axis of rotation (5) by means of a belt drive. Computed tomograph with a gantry (1) according to one of the Claims 8 to 10 .

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