CN104735891A - Rotating frame, related rack, computer fault imaging instrument - Google Patents

Abstract

The invention relates to a rotating frame (4) for a gantry (1) of a computed tomography apparatus, the rotating frame must be designed to be stable mainly in the direction of the centrifugal force acting upon rotation. Furthermore, in an annular or cylindrical reinforcing frame of sufficient strength and rigidity, centrifugal forces can contribute to the stabilization of the components mounted on the inner side of the reinforcing frame. The inventors therefore propose, according to a first variant, that the rotating frame of a gantry for a computed tomography apparatus be fitted with a cylindrical base body ( 14 ) having a central axis of rotation. The stability of the base body is increased by a reinforcement frame having at least two annular reinforcement elements (15), wherein the reinforcement elements (15) are arranged outside the base body (14) and coaxially to the central axis of rotation. In this case, a reinforcing element ( 15 ) is connected to the base body ( 14 ), which reinforcement element ( 15 ) is designed to absorb centrifugal forces acting on the base body ( 14 ).

Description

Rotating frame and associated gantry and computed tomography

technical field

The invention relates to a rotating frame for a gantry of a computer tomograph, a gantry for a computer tomograph and a computer tomograph. Computed tomography machines are designed to produce X-ray images, especially cutaway images. Computed tomography is mainly used in medical imaging, but can also be used in non-destructive testing of materials and other technical areas. An image is reconstructed from measurement data, wherein the measurement data includes projections from a plurality of different projection directions. In order to record projections from different projection directions, the x-ray source and the x-ray detector interacting with the x-ray source are rotated around the recording area. In the construction of a computed tomography apparatus, all components which are intended to be rotatable, in particular the x-ray source and the x-ray detector, are mounted in a so-called swivel frame. Such a rotating frame is also referred to as the "drum" or rotatable part of the gantry of a computed tomography machine. The rotating frame is rotatably supported in the frame housing. The frame housing also has a fixed support frame, to which the panel element or the wind deflector part is fastened. The rotating frame is again rotatably mounted in this carrier, for example by means of roller bearings or by means of magnetic bearings.

Background technique

In order to avoid motion artifacts that may form in the reconstructed image due to motion in the acquisition area, it is aimed at selecting the smallest possible time range for detecting the projections required for the reconstruction due to high rotational speeds. In current computed tomography devices, a rotational speed of 240 rpm is achieved. But in the future, the speed should be raised to at least 300 rpm. Through the combination of high rotational speed, large rotational radius and high rotational mass, the rotating frame is a mechanically highly loaded component which, in addition to absorbing the occurring stresses, also ensures the positioning of the x-ray source and x-ray detector Keep, as component position shifts in the sub-millimeter range can already cause significant damage to image quality. Therefore, the essential requirement for the swivel frame is high stability, especially high strength and rigidity, in order to keep the deformation of the swivel frame and thus the positional displacement of the parts used to record the projection as small as possible.

Therefore, rotating frames are generally manufactured as metal castings, especially aluminum castings. Of course, the increased stability of the swivel frame due to the solid construction of the swivel frame also results in a higher material expenditure and greater weight. The components for driving the rotor as well as the machine housing must therefore also be adapted to the greater gravitational force and the resulting greater centrifugal force. Therefore, it is proposed in DE 102008036019 A1 to produce the revolving frame from a particle-reinforced composite material with a metal matrix.

Contents of the invention

The technical problem underlying the invention is therefore to be able to construct the rotating frame of the gantry of a computed tomography apparatus in the technically simple manner possible. The technical problem is solved by a rotating frame for a gantry of a computed tomography apparatus, comprising a cylindrical base body with a central axis of rotation, and a reinforcing frame with at least two annular reinforcing elements, wherein the reinforcing The element is arranged outside the base body and coaxially to the central axis of rotation, wherein the reinforcement element is connected to the base body in such a way that the reinforcement element is designed to absorb centrifugal forces acting on the base body.

The invention is based on the recognition that the rotating frame must be designed to be stable primarily in the direction of the centrifugal force acting upon rotation. Furthermore, the present inventors have realized that in an annular or cylindrical reinforcement frame of sufficient strength and stiffness, centrifugal forces can lead to stabilization of components mounted on the inner side of the reinforcement frame. Accordingly, the inventors propose, according to a first variant, to construct a rotating frame for a gantry of a computed tomography apparatus on a cylindrical base body with a central axis of rotation. The stability of the base body is increased by a reinforcement frame having at least two annular reinforcement elements, wherein the reinforcement elements are arranged on the outside of the base body and coaxially to the central axis of rotation. In this case, the reinforcement element is connected to the base body in such a way that the reinforcement element is designed to absorb centrifugal forces acting on the base body. The first variant of the solution according to the invention is technically particularly simple to convert.

Furthermore, the annular reinforcing element does not extend over the entire dimension of the cylindrical base body along the axis of rotation. Material is thus saved compared to conventional solid structures, so that the revolving frame according to the invention has a particularly low weight. That is to say, the revolving frame according to the invention can be designed in such a way that it achieves particularly high rotational speeds with a particularly high stability at a comparatively low weight.

The stability of the rotating frame, in particular against forces which can cause torsion of the rotating frame, is further increased in that a cross member is arranged at least partially between the basic body and the reinforcement element, the cross member being oriented along the central rotation axis. The crossbeams serve, on the one hand, to dissipate the centrifugal forces acting on the base body to the reinforcement elements, but, on the other hand, they also serve to absorb forces which, without the crossbeams, would cause the rotating frame to twist.

In a second variant of the invention, the cylindrical base of the rotating frame can be omitted. In this case, the stiffening frame comprises at least two annular stiffening elements arranged coaxially to the central axis of rotation and transverse beams oriented along the central axis of rotation. The reinforcement element is connected to the cross member in such a way that the reinforcement element is designed to absorb centrifugal forces acting on the cross member. Due to the grid-like structure of stiffening elements and beams, the stiffening frame has sufficient stability even without a cylindrical base body. The second variant of the solution according to the invention is also technically simple to convert and enables the swivel frame to be produced with a particularly low weight.

The reinforcement frame can be designed in particular such that the reinforcement elements are positively connected to the cross member. As a result, the frame is reinforced and thus the swivel frame has a particularly high stability.

According to another aspect of the invention, the crossbeam distribution can have a first recess on the side facing the reinforcement element, wherein the reinforcement element has a second recess at the connection point with the crossbeam, thereby forming a gap between the reinforcement element and the crossbeam. plug-in connections between them. Such a plug-in connection is technically simple to implement and has the advantage that a simple mounting of the swivel frame is achieved, in particular with a high degree of stability.

Furthermore, it is proposed that the swivel frame has at least one adapter within the reinforcing frame for integrating the electronic components. Such an adapter allows a simple integration of the electronic components required for the tomographic recording, such as an x-ray source or an x-ray detector, into the rotating frame.

According to a further aspect of the invention, at least one reinforcing element is designed as a rotor of an electric motor. Hereby, a further weight advantage is achieved, since the drive part, ie the rotor, simultaneously has the function of stabilizing the rotating frame as part of the reinforcing frame.

Furthermore, the invention includes a gantry for a computed tomography apparatus, which has a swivel frame according to the invention and a support frame, wherein the swivel frame is rotatably mounted on the support frame via an outer bearing. Alternatively, the rotating frame may be rotatably supported on the support frame via inner bearings. For both types of bearings, the low weight of the swivel frame according to the invention has a favorable effect on the structural shape of the machine frame and in particular of the supporting frame. Since the lower weight of the swivel frame exerts less force on the support frame, the support frame of the stand according to the invention requires less material to produce than conventional support frames.

One aspect of the invention relates to a stand with a drive element, wherein the drive element is designed to cause a swivel movement of the rotating frame about a central axis of rotation by means of a belt drive. Such a belt drive is technically particularly simple to realize. This embodiment of the rack is therefore a technically particularly simple and at the same time stable and reliable as well as cost-effective solution.

If the rotating frame is designed such that it achieves particularly high rotational speeds with relatively low weight due to its particularly high stability, this enables the computed tomograph to record images with a higher temporal resolution.

Description of drawings

The invention is further described and illustrated below on the basis of the exemplary embodiments shown in the drawings. In the attached picture:

Fig. 1 is a computed tomography apparatus according to the present invention,

Figure 2 is a rotating frame according to a first variant of the invention,

Fig. 3 is a rotating frame according to a second variant of the present invention,

Figure 4 is a cross-section of the reinforcing element,

Fig. 5 is the vertical section of the revolving frame with beam,

Fig. 6 is the longitudinal section of the revolving frame without crossbeam,

Fig. 7 is the longitudinal section of the revolving frame with the crossbeam and the middle outer bearing,

Fig. 8 is the longitudinal section of the revolving frame with the cross beam and the outer bearing on the side,

Figure 9 is a longitudinal section of a rotating frame with beams and inner bearings,

Figure 10 is a longitudinal section of the revolving frame with beams and adapters for integrated electronics,

Figure 11 is a cross-section of a strength member wound with copper wire, and

Figure 12 is a longitudinal section of the revolving frame with beams and electromagnetic drives.

Detailed ways

FIG. 1 shows a computed tomography apparatus according to the invention. The computed tomography apparatus includes a gantry 1 with a rotating frame 4 . In the exemplary embodiment shown here, an x-ray source 8 and an x-ray detector 9 interacting with the x-ray source 8 are integrated in the rotating frame 4 . The rotating frame 8 rotates about the longitudinal axis 5 during the recording of the x-ray projections, during which the x-ray source 8 emits the x-rays 2 in the form of an x-ray beam. In particular the X-ray beam can be fan-shaped or cone-shaped. A computed tomograph can also have more than just one x-ray source 8 and more than just one x-ray detector 9 in order to be able to record with the so-called dual-energy method. In the exemplary embodiment shown here, the x-ray source 8 is an x-ray tube. In the exemplary embodiment shown here, the x-ray detector 9 is a line detector with several lines, for example 128 or 256 lines.

When the rotating frame 4 rotates, X-ray projections can be photographed from various directions, and these X-ray projections can be reconstructed into high-resolution three-dimensional spatial images. During the recording of the x-ray projections, in the exemplary embodiment shown here, the patient 3 lies on a patient couch 6 which is connected to the couch base in such a way that it carries the patient couch 6 with the patient 3 . The patient couch 6 is designed to move the patient 3 through the opening 10 of the gantry 1 in the imaging direction. The recording direction is generally given by the axis of rotation 5 of the rotating frame 4 . Of course, the axis of rotation 5 can also be inclined with respect to the imaging direction along which the patient 3 is moved during the imaging, for example in that the swivel frame 4 is designed as part of a tiltable gantry.

In the exemplary embodiment shown here, the computer tomograph also includes a computer 12 , which is designed, for example, to control the computer tomograph and to store and process a plurality of x-ray projections. A computer 12 is connected to the output unit 11, for example for image output of X-ray tomographic pictures. The output unit 11 is, for example, an LCD, plasma or OLED screen. Furthermore, a computer 12 is connected to an input unit 13 . The input unit 13 is, for example, a keyboard, a mouse, a so-called touch screen or a microphone for speech input. The interface 7 enables the computer 12 to communicate with the computer tomograph and with the input unit 13 or the output unit 11 . The interface 7 is a well-known hardware or software interface, such as a hardware interface PCI bus, USB or Firewire.

FIG. 2 shows a rotating frame according to a first variant of the invention. In the embodiment of the first variant of the invention shown here, the revolving frame 4 comprises a cylindrical base body 4 and three annular stiffening elements 15 arranged coaxially to the axis of rotation 5 of the base body 4 . Furthermore, the reinforcing elements 15 have the same outer diameter and substantially the same inner diameter. The inner diameter of the reinforcing element 15 deviates from a fixed value only at the point of connection to the cross member 16 via an inner recess. The stiffening element 16 can, as shown here, be of elongated configuration and be provided with a flat rectilinear surface. In a different embodiment of the invention, the reinforcement element 16 is designed substantially square, wherein the deviation from the square shape is based on a recess or a slight curvature at the connection point to the reinforcement element 15 and an adaptation to the outer surface of the base body 14 Outline. The two reinforcement elements 15 form together with the transverse beam 16 oriented in the direction of the axis of rotation 5 a reinforcement frame which is arranged on the outside of the base body 14 . The transverse beam 16 is oriented in the direction of the axis of rotation 5 in such a way that the axis of its longest dimension is oriented in the direction of the axis of rotation 5 , in particular the longest axis can be oriented parallel to the axis of rotation. The reinforcing frame forms a grid-like structure and is connected to the basic body 14 in such a way that, during rotation about the axis of rotation 5 , centrifugal forces acting on the basic body 14 can be at least partially transmitted to the reinforcing frame. The beam 16 can be fixedly connected to the base 14 by a connection technique, such as welding or bonding.

The base body 14 is generally produced from a sheet metal part, for example a steel sheet. Alternatively, the base body 14 can also be produced from a semi-finished product. In various embodiments, the thickness of the base body 14 can vary within a smaller range between 1 millimeter and a few millimeters. According to one aspect of the invention, the base body 14 has a thickness of 1 to 2 mm. For the established cast aluminum method, the similar cylindrical elements of a conventional rotating frame are many times thicker. For technical reasons, aluminum castings generally have a thickness of at least 15 mm. Even taking into account the lower density of aluminum compared to sheet steel, the construction according to the invention has a considerable weight advantage. Base body 14 can form a complete cylinder as shown in FIG. 2 ; , coolant pipes and other supply channels are arranged between elements disposed inside and outside the base body.

The base body 14 can also be made of non-metallic materials, such as carbon fibers, composite materials or plastics. The basic body 14 must have sufficient stability so that it does not break or become severely deformed during the operation of the rotating frame 4 , so that artifacts in the imaging are thereby caused. The precise stability, especially the precise strength and rigidity, of the basic body 14 depends on the structural shape of the reinforcing frame. The material of the base body 14 and its thickness also depend on the diameter of the base body 14 , wherein generally large diameters lead to particularly stable materials and/or greater thicknesses. In the area of medical imaging, the diameter of the base body 15 and of the reinforcing frame is approximately 1 to 1.6 meters, wherein larger and smaller diameters are possible in other embodiments of the invention.

The reinforcing element 15 has greater stability than the base body 14 . The reinforcement element 15 is therefore preferably produced in one piece, that is to say without welding, gluing or other joining techniques. However, it is also possible to connect several one-piece reinforcing elements 15 to one another, see eg FIG. 12 . The reinforcement element 15 can be produced from a metal casting, for example an aluminum casting, or by a milling method. The typical dimension of the stiffening element 15 along the axis of rotation 5 is approximately 1 to 2 centimeters. If particularly high stability is desired, the dimensions of the reinforcing element 15 along the axis of rotation 5 can be larger. The reinforcing element 15 generally has a diameter of a few centimeters in the radial direction. In a particularly stable configuration of the invention, the stiffening element 15 is larger than 10 cm in the radial direction.

FIG. 3 shows a rotating frame according to a second variant of the invention. In a second variant of the invention, the cylindrical base body 14 is omitted. The revolving frame 4 thus has a stiffening frame with at least two stiffening elements 15 and a plurality of crossbeams 16, wherein the stiffening elements 15 are connected to the crossbeams 16 in such a way that the stiffening elements 15 are designed to absorb the effects on the crossbeams 16 centrifugal force. To this end, at least a portion of the crossbeam 16 is located inside the reinforcing element 15 .

In a typical configuration of the second variant of the invention, the reinforcing elements 15 have the same outer diameter and substantially the same inner diameter. If more than two reinforcing elements 15 are used, they can have the same distance from one another along the axis of rotation 5 in order to ensure that the centrifugal forces are transmitted as uniformly as possible from the base body 14 or the transverse beam 16 to the reinforcing elements 16 . Furthermore, the crossbeams 16 and the reinforcement elements 15 can also be fixedly connected to each other by connection techniques such as welding or gluing in order to increase the stability of the reinforcement frame and thus the stability of the rotating frame 4 .

The crossbeams 16 can be produced like the reinforcing elements 15 from metal castings and must have a high degree of stability. The transverse beam 16 extends in the usual way over the entire dimension of the base body 14 along the axis of rotation 5 . Irrespective of whether the rotating frame 4 has a base body 14 or not, the transverse beams 16 can have the same dimensions or even substantially the same configuration along the axis of rotation 5 in order to achieve as uniform a force transmission as possible from the transverse beams 16 to the reinforcement elements 15 .

FIG. 4 shows a cross section of the reinforcing element, that is to say a section through a plane perpendicular to the axis of rotation 5 . In the embodiment shown here, the reinforcement element 15 has uniformly arranged rectangular recesses on its inner side. The recess is dimensioned such that a cross member 16 can be arranged in the recess of the stiffening element 15 in an exact fit. This kind of reinforcement element 15 can be used in the expansion design of the revolving frame 4 according to the present invention, and wherein, crossbeam 16 has first notch on the side facing reinforcement element 15 respectively, thereby can be in reinforcement element 15 and crossbeam 16 A form-fitting plug-in connection is formed between them. Such a form-fitting plug connection is technically particularly simple to implement and enables a particularly stable construction of the swivel frame 4 .

In other embodiments of the reinforcement element 15 the recess can also have a different shape than the rectangular shape, for example the cross section of the recess can be designed as a trapezoid. Furthermore, the recesses can be arranged unevenly, for example because greater centrifugal forces are to be expected in a certain area of the rotating frame 4 than in other areas, so that a positive connection to the crossbeam 16 is expected in this certain area. higher density. For example, greater centrifugal forces are to be expected when particularly heavy electronic components are integrated in a defined area.

Figure 5 shows a longitudinal section of the revolving frame with cross beams. Both the dotted line V in FIG. 2 and the central axis of rotation 5 lie within the section. In the exemplary embodiment shown here, the reinforcement element 15 (measured as a distance from the axis of rotation 5 ) is arranged at the same height as the cross member 16 . In other embodiments, the reinforcement elements 15 and the crossbeams 16 can also be of different heights, wherein in principle both the reinforcement elements 15 and the crossbeams 16 can be higher. Taller reinforcing elements 15 are advantageous when the reinforcing elements 15 are designed as part of the bearing, as is the case with the embodiments described in FIGS. 7 to 9 . In the embodiment shown in FIG. 5 , the reinforcing element 15 and the crossbeam 16 are connected by means of a plug-in connection. Furthermore, the transverse beam 16 is fixedly connected to the base body 14 so that the plug connection is formed in a form-fitting manner.

FIG. 6 shows a longitudinal section of a revolving frame without transverse beams. In this case, the dotted line VI in FIG. 2 and the central axis of rotation 5 lie in the sectional plane. In the embodiment shown here, the reinforcement element 15 is fixedly connected to the base body 15 , whereby the swivel frame 4 achieves a particularly high degree of stability. In other embodiments, connecting elements can also be arranged between the base body 4 and the reinforcement element 15 , in particular for connecting the reinforcement element 15 to the base body 14 .

FIG. 7 shows a longitudinal section through a revolving frame with transverse beams and centrally arranged outer bearings. The outer bearings indicated here are steel wire rolling bearings In this case, the spherical rolling bodies 23 are arranged between the central reinforcement element 15 and the central support 25a, which is fixedly connected to the support frame of the machine frame 1, so that the rolling bodies 23 enable the rotating frame 4 to rotate around Axis 5 rotates. The steel wires 26 run along the central reinforcement element 15 around the axis of rotation 5 and form a cage in which the rolling bodies 23 run. The construction shown here has a low weight and is very inexpensive.

FIG. 8 shows a longitudinal section through a revolving frame without transverse beams and with laterally arranged outer bearings. The outer bearings comprise two wire rolling bearings with rolling bodies 23 and wires 26 , which in each case enable the two non-central reinforcement elements 15 and thus the rotation of the rotating frame 4 about the axis of rotation 5 . Here, the non-central support 25 b is fixedly connected to the support frame of the machine frame 1 . The advantage of the configuration shown here is a particularly high stability of the rotational movement. In other embodiments, more than two wire rolling bearings can also be used.

Figure 9 shows a longitudinal section of the revolving frame with cross beams and inner bearings. In the exemplary embodiment shown here, the inner reinforcing element 15 is designed for rotation about the axis of rotation 5 by means of a rolling bearing with rolling elements 23 and an inner carrier 25c. In this case, the rotational movement is carried out by means of a belt drive, wherein the bearing surface for the belt is indicated by the surface of the inner reinforcement element 15 which is profiled transversely to the sectional plane shown here. This surface is especially suitable for cooperating with V-belts. Here, the V-belt transmits the rotational movement of the electric motor to the rotating frame 4 . Alternatively, the surface of the inner reinforcing element 15 has transverse ribs transversely to the section plane shown here, whereby the reinforcing element 15 can cooperate particularly well with the toothed belt for the transmission of rotational movements. Furthermore, the types of bearing arrangements shown here and other types, such as magnetic bearing arrangements, can in principle be combined with different drive types, such as belt drives or electromagnetic drives. In particular, different bearing arrangements and forms of drive can be realized in combination with the rotary frame 4 with and without the base body 14 .

Figure 10 shows the rotating frame with beams and adapters for integrating electronics. The electronic components can be the x-ray source 8 , the x-ray detector 9 or other electrically powered components which are required for recording tomographic images. The adapter 19 is designed such that at one end it can be fixedly connected to the base body 14 or the reinforcement frame, and at its other end certain electronic components can be integrated into the swivel frame 4 . For this purpose, the adapter 19 can at least partially comprise the electronic components and/or its shape can be adapted to the respective electronic components. In particular, the adapter 19 can be fixedly connected to the electronic component. Furthermore, the adapter 19 can be designed to provide, for example, an interface for supplying power to the integrated electronic components.

Figure 11 shows a reinforcing element with copper wires wrapped around it. The reinforcing element 15 shown here is wound with a copper wire 26 so that the reinforcing element 15 can be used as a rotor 20 of an electric motor. It is also possible to use other materials than copper for the winding of the reinforcement element 15 , which are suitable if the reinforcement element 15 is designed as a rotor 20 of an electric motor.

Figure 12 shows a rotating frame with an electromagnetic drive. The motor drive is based on a stator 21 and a rotor 20 , wherein the rotor 20 comprises a plurality of interconnected reinforcing elements 15 . The individual reinforcing elements 15 are made of so-called silicon steel sheets, which are soft magnetic and generally made of steel. However, other suitable materials can also be used for the production of the individual plate parts 27 . The plates 27 joined to form a reinforcing element 15 are wound with steel wires 26 as shown in FIG. 10 . The formation of the rotor 20 by a plurality of plates 27 rather than by a solid iron core makes the rotor 20 advantageously magnetic. In particular, eddy currents are avoided by the connection of the plurality of plate parts 27 . The stator 21 is fixedly connected to the supporting frame of the machine frame 1 .

It goes without saying for a person skilled in the art that the various exemplary embodiments described here can in principle be combined with one another as far as the person skilled in the art considers to be technically advisable.

Claims (11)

1. the rotating frame (4) of the frame for computed tomograph (1), comprise the columniform matrix (14) with central rotation axis (5), and comprise the reinforced frame with at least two annular reinforcing element (15), wherein, described reinforcing element (15) is arranged in the outside of described matrix (14) and coaxially arranged with central rotation axis (5), wherein, described reinforcing element (15) and described matrix (14) connect into, described reinforcing element (15) is made to be designed for absorption to the centrifugal force on described matrix (14).

2. the rotating frame (4) of the frame for computed tomograph (1), comprise the reinforced frame with central rotation axis (5), wherein, described reinforced frame has at least two annular reinforcing element (15) coaxially arranged with described central rotation axis (5) and along the directed crossbeam (16) of described central rotation axis (5), wherein, described reinforcing element (15) and described crossbeam (16) connect into, described reinforcing element (15) is made to be designed for absorption to the centrifugal force on described crossbeam (16).

3. by rotating frame according to claim 1 (4), also comprise the crossbeam (16) be arranged at least in part between described matrix (14) and described reinforcing element (15), wherein, described crossbeam (16) is directed along described central rotation axis (5).

4. by the rotating frame (4) described in Claims 2 or 3, wherein, described reinforcing element (15) is connected with described crossbeam (16) form fit formula ground.

5. by rotating frame according to claim 4 (4), wherein, described crossbeam (16) has the first recess respectively on the side facing described reinforcing element (15), wherein, described reinforcing element (15) has the second recess at the tie point place with described crossbeam (16), thus is formed in the socket connection between described reinforcing element (15) and described crossbeam (16).

6., by the rotating frame (4) that one of claim 1 to 5 is described, comprise at least one adapter (19) being installed in described reinforced frame inside for Integrated Electronic Component.

7., by the rotating frame (4) that one of claim 1 to 6 is described, wherein, at least one reinforcing element (15) is designed to the rotor (20) of motor.

8. the frame for computed tomograph (1), comprise by the rotating frame (4) one of claim 1 to 7 Suo Shu and bracing frame, wherein, described rotating frame (4) is pivotally bearing on support frame as described above by outer bearing.

9. the frame for computed tomograph (1), comprise by the rotating frame (4) one of claim 1 to 7 Suo Shu and bracing frame, wherein, rotating frame (4) is pivotally bearing on support frame as described above by inner bearing.

10. the frame for computed tomograph (1), comprise by the rotating frame (4) one of claim 1 to 6 Suo Shu, wherein, described frame has driving element, wherein, described driving element is designed to make described rotating frame (4) by belt transmission around central rotation axis (5) screw movement.

11. 1 kinds of computed tomographs, it has by the frame (1) one of claim 8 to 10 Suo Shu.