阅读说明：本技术 用于多重影像系统的pet主机及其安装方法 (PET host for multiple image system and installation method thereof ) 是由 于庆泽 于 2021-08-26 设计创作，主要内容包括：本发明涉及一种用于多重影像系统的PET主机,该PET主机为无导轨系统的PET主机,无导轨系统的PET主机配置有用于实现PET主机与多重影像系统的其余主机定位安装的安装结构,安装结构用于无导轨系统的PET主机朝向其余主机移动时,使PET主机的轴线与其余主机的轴线重合。还提供了一种该无导轨系统PET主机的安装方法,在该PET主机朝向多重影像系统的其余主机移动以定位安装时,安装结构使PET主机的轴线始终与其余主机的轴线重合。本发明提供的PET主机无需设置导轨系统,同时还实现了该无导轨系统的PET主机在多重影像系统中的直接、快速安装。(The invention relates to a PET (positron emission tomography) host for a multi-image system, which is a PET host without a guide rail system, wherein the PET host without the guide rail system is provided with an installation structure for realizing the positioning and installation of the PET host and other hosts of the multi-image system, and the installation structure is used for enabling the axis of the PET host to coincide with the axes of the other hosts when the PET host without the guide rail system moves towards the other hosts. When the PET host moves towards the rest hosts of the multi-image system to be positioned and installed, the axis of the PET host is always coincided with the axes of the rest hosts by the installation structure. The PET host provided by the invention does not need to be provided with a guide rail system, and simultaneously, the direct and rapid installation of the PET host without the guide rail system in a multiple image system is realized.)

1. The PET host machine is a PET host machine without a guide rail system, and is provided with a mounting structure for positioning and mounting the PET host machine and other host machines of the multiple image system, wherein the mounting structure is used for enabling the axis of the PET host machine to coincide with the axes of the other host machines when the PET host machine without the guide rail system moves towards the other host machines.

2. The PET host of claim 1, wherein the mounting structure of the PET host configuration comprises:

the first positioning piece is arranged on the PET host machine;

and the second positioning piece is matched with the first positioning piece to realize the installation on the PET host, and is provided with a central axis, and when the second positioning piece is installed on the PET host, the central axis is superposed with the axis of the PET host.

3. The PET host of claim 2,

the second positioning piece is provided with a positioning surface vertical to the axis of the PET host machine, so that when the second positioning piece is matched with the first positioning piece, the central axis coincides with the axis of the PET host machine.

4. The PET host of claim 2,

the second positioning part is also provided with a calibration part which can ensure that the central axis is basically coincident with the axis of the rest main machine when the PET main machine moves towards the rest main machine.

5. The PET host of claim 4,

the calibration piece is detachably arranged on the second positioning piece;

the calibration piece is a columnar structure, and the cross-sectional area of the far end of the calibration piece is smaller than that of the near end of the calibration piece.

6. The PET host of claim 2,

the first positioning piece is a positioning hole or a positioning pin arranged on the PET host;

and the second positioning part is provided with a positioning pin or a positioning hole corresponding to the positioning hole or the positioning pin.

7. The PET host of claim 2,

the mounting structure is characterized by further comprising a first connecting piece and a second connecting piece, wherein the first connecting piece and the second connecting piece are arranged on the PET host, and the first connecting piece and the second connecting piece are detachably connected in the installation process of the PET host.

8. The method for mounting a non-rail system PET host of a multi-imaging system as claimed in any one of claims 1 to 7,

when the PET host of the guide-rail-free system moves towards the rest hosts of the multi-image system to be positioned and installed, the installation structure enables the axis of the PET host of the guide-rail-free system to be always coincident with the axes of the rest hosts.

9. The mounting method of claim 8,

the mounting structure comprises a first positioning piece arranged on the PET host machine and a second positioning piece matched with the first positioning piece;

the method comprises the following steps:

installing a second positioning piece of the installation structure, and matching the second positioning piece with the first positioning piece to realize that the central axis of the second positioning piece is superposed with the axis of the PET host;

moving the PET host computer, and moving the PET host computer towards the rest host computers of the multi-image system to the installation initial position of the PET host computer;

calibrating the mounting structure to enable the central axis of the second positioning piece to be basically coincident with the axes of the rest of the main machines;

and continuously moving the PET host until the PET host reaches the installation termination position, wherein the central axis and the axes of the rest hosts are kept basically coincident in the continuous moving process.

Technical Field

The invention relates to the field of medical equipment, in particular to a PET (positron emission tomography) host of a multi-image system and an installation method thereof.

Background

The PETCT system is widely used in daily human health examination and disease diagnosis. Among them, PET is an imaging technique that non-invasively shows functions and metabolism of organs of a human body, and can be used for diagnosis of diseases such as early tumors and the like; CT scans the body with X-ray beams to provide an image of the body's organs and tissues. The PETCT system provides detailed information of a focus by PET, and provides accurate anatomical positioning of the focus by CT, thereby obviously improving the accuracy of diagnosis.

Currently, PET is composed of a PET host and a rail system, see CN201410388361.8, wherein the rail system includes a main rail, sometimes also called a main support (referred to as a main support adjusting unit in the literature), and a maintenance rail, and in a normal state, the PET host is supported on the main rail or the main support. When a core component slip ring of the CT needs to be repaired or maintained, the PET needs to be pulled out, the maintenance guide rail is connected to the main guide rail or the main support, and then the PET host is pulled out along the guide rail system; after the maintenance is finished, the PET is reset along the guide rail system.

Document CN201320080820.7 also describes an imaging device with a rail arrangement, which includes a linear main rail, a linear maintenance rail and a slider. When the image equipment needs to be maintained, the maintenance guide rail is connected to the main guide rail, and the PET slides to the maintenance guide rail along with the sliding block from the main guide rail, so that the required operation distance for maintenance is achieved. After maintenance is finished, the PET slides to the working position in the reverse direction, and the maintenance guide rail is detached after positioning.

The existing design brings certain disadvantages while bringing the benefits. In order to ensure the separable design of the main guide rail and the maintenance guide rail, the processing precision of the guide rail system and the support thereof must meet the requirements of rigidity and precision, and the cost is high; all the guide rails are arranged along a straight line, so that the pulling direction of the image equipment is fixed, and the pulling direction is limited; thirdly, for the PET host computer with the guide rail, the position of the guide rail must be adjusted firstly in the installation process, and then the PET host computer on the guide rail is adjusted, so that the workload of the first installation is increased.

Disclosure of Invention

Technical problem to be solved

The invention aims to provide a PET host for a multi-image system, wherein the PET host is a PET host without a guide rail system, so that the arrangement of the guide rail system in the prior art is omitted, and the multi-image system can be directly and quickly installed in place. Meanwhile, the invention also provides an installation method of the guide rail-free system PET host of the multi-image system.

(II) technical scheme

In order to achieve the purpose, the invention adopts the main technical scheme that:

the utility model provides a PET host computer for multiple image system, the PET host computer is the PET host computer of no guide rail system, the PET host computer of no guide rail system disposes the mounting structure who is used for realizing PET host computer and the other host computers location installation of multiple image system, mounting structure is used for when the PET host computer of no guide rail system moves towards other host computers, make the axis of PET host computer with the axis coincidence of other host computers.

Preferably, the mounting structure of the PET host configuration comprises:

the first positioning piece is arranged on the PET host machine;

and the second positioning piece is matched with the first positioning piece to realize the installation on the PET host, and is provided with a central axis, and when the second positioning piece is installed on the PET host, the central axis is superposed with the axis of the PET host.

Preferably, the second positioning part has a positioning surface perpendicular to an axis of the PET host, so that when the second positioning part is matched with the first positioning part, the central axis coincides with the axis of the PET host.

Preferably, the second positioning member further has a calibration member, and the calibration member can ensure that the central axis of the PET main unit is substantially coincident with the axis of the rest of the main unit when the PET main unit moves towards the rest of the main unit.

Preferably, the calibration member is detachably disposed on the second positioning member;

the calibration piece is a columnar structure, and the cross-sectional area of the far end of the calibration piece is smaller than that of the near end of the calibration piece.

Preferably, the first positioning piece is a positioning hole or a positioning pin arranged on the PET host;

and the second positioning part is provided with a positioning pin or a positioning hole corresponding to the positioning hole or the positioning pin.

Preferably, the mounting structure further comprises a first connecting piece arranged on the PET host and a second connecting piece arranged on the second positioning piece, and the first connecting piece and the second connecting piece are detachably connected in the installation process of the PET host.

In a second aspect, the present invention further provides an installation method of the PET host without the rail system in the multiple imaging system, where when the PET host without the rail system moves toward the rest of the multiple imaging system to be installed in a positioning manner, the installation structure makes an axis of the PET host without the rail system coincide with axes of the rest of the multiple imaging system all the time.

Preferably, the mounting structure comprises a first positioning piece arranged on the PET host machine and a second positioning piece matched with the first positioning piece;

the method comprises the following steps:

installing a second positioning piece of the installation structure, and matching the second positioning piece with the first positioning piece to realize that the central axis of the second positioning piece is superposed with the axis of the PET host;

moving the PET host computer, and moving the PET host computer towards the rest host computers of the multi-image system to the installation initial position of the PET host computer;

calibrating the mounting structure to enable the central axis of the second positioning piece to be basically coincident with the axes of the rest of the main machines;

and continuously moving the PET host until the PET host reaches the installation termination position, wherein the central axis and the axes of the rest hosts are kept basically coincident in the continuous moving process.

(III) advantageous effects

The PET host for the multiple image system provided by the invention omits the existing guide rail system, and simultaneously can ensure that the PET host can be directly and quickly installed in place with other hosts of the multiple image system.

The invention aims to remove a supporting device at the lower part of a PET (polyethylene terephthalate) host machine, which comprises a main guide rail and a maintenance guide rail; meanwhile, the installation device with a simple structure is adopted, so that the multiple image system can be installed in place in an aligned mode without any guide rail or supporting device when being installed for the first time or being installed again after later maintenance. And can directly use the frock dolly that has the wheel to remove the PET host computer to any position, after the equipment maintenance, adopt this installation device, can accurately reset the PET host computer to the position before, guarantee the reliability in position.

And the maintenance of the guide rail system is not needed, so that the cost is effectively reduced.

Drawings

FIG. 1 is a schematic structural diagram of a PETCT system provided by the present invention;

FIG. 2 is a schematic structural diagram of a non-rail PET host according to the present invention;

FIG. 3 is a schematic structural diagram of a second positioning element according to the present invention;

FIG. 4 is a schematic structural view of a calibration member provided in the present invention;

FIG. 5 is a schematic partial cross-sectional view of the calibration member after being inserted into the second positioning member;

FIG. 6 is an enlarged schematic view of a portion of the structure of FIG. 5;

FIG. 7 is a schematic structural view of another second positioning element according to the present invention;

FIG. 8 is a schematic structural diagram of a CT host according to the present invention;

FIG. 9 is a flow chart of a PETCT system installation method provided by the invention.

[ description of reference ]

10: a PET host machine; 20: a CT host; 30: transporting the tooling trolley;

1: a first positioning member;

2: a second positioning member; 21: a plate-like member; 22: a central sleeve; 23: positioning the surface; 24: positioning holes; 25: a through hole;

3: a calibration piece; 31: an installation end; 32: a CT mounting part; 33: a PET mounting section; 34: an introduction section; 35: marking lines; 36: introducing the cone;

AA': an axis; BB': a rotation axis; aa': a central axis.

Detailed Description

The core of the invention is that the arrangement of a guide rail system in a PET host in the prior art is omitted, and the multiple image equipment can be quickly and accurately installed in place through the installation device with simple structure when being installed for the first time or being installed again after maintenance.

Therefore, the invention provides a PET host for a multiple imaging system, wherein the PET host is a PET host without a guide rail system, the PET host without the guide rail system is provided with a mounting structure for realizing the positioning and mounting of the PET host and the rest hosts of the multiple imaging system, and the mounting structure is used for enabling the axis of the PET host to coincide with the axes of the rest hosts when the PET host without the guide rail system moves towards the rest hosts.

Through the installation structure, the PET host and the rest hosts of the multi-image system can be quickly aligned and installed without any guide rail or supporting device in the installation process of the multi-image system. And the mounting structure has the advantages of less parts, simple structure and easy processing.

For better explaining the present invention, the first imaging device is CT and the second imaging device is PET, and the present invention will be described in detail by embodiments with reference to the attached drawings. It is to be understood that the multiple imaging system exemplified by PET and CT below is only for the purpose of enabling a clearer and more thorough understanding of the present invention and is capable of fully conveying the scope of the present invention to those skilled in the art, and is not intended to limit the scope of the present invention. Wherein like parts in different embodiments bear like reference numerals.

Example 1

Fig. 1 illustrates a PETCT system comprising a PET host 10 and a CT host 20, wherein the PET host 10 does not require support from a rail system, but rather the PET host 10 is moved to any desired location using a wheeled transport tooling cart 30. A mounting structure, which will be described in detail below, is provided on the PET mainframe 10 such that when the PET mainframe 10 is moved toward the CT mainframe 20 for mounting, the axis AA 'of the PET mainframe 10 can be easily aligned with the rotation axis BB' of the CT mainframe 20.

Fig. 2 further preferably shows the PET mainframe 10 of the rail-less system provided by the present embodiment. For the PET host 10, the PET detector is mounted on a PET mounting plate, which is a machined metal aluminum plate or a metal steel plate, so that the axis thereof is the axis of the metal plate, and the detector is precisely mounted on the metal plate so that the axis of the detector coincides with the axis of the metal plate, which will be hereinafter referred to as axis AA'.

The mounting structure configured to the PET host 10 includes a first positioning member 1 disposed on the PET host 10, and the first positioning member 1 may have a plurality of different structures, and in this embodiment, the first positioning member 1 is preferably a positioning hole or a positioning pin. The mounting structure further comprises a second positioning member 2 capable of cooperating with the first positioning member 1 to realize the mounting on the PET host 10, as exemplarily shown in fig. 3, wherein the second positioning member 2 has a central axis AA ', and the central axis AA ' coincides with an axis AA ' of the PET host 10 when the second positioning member 2 is mounted on the PET host 10. The second positioning member 2 has a positioning surface 23 perpendicular to an axis AA ' of the PET host 10, so that the central axis AA ' coincides with the axis AA ' of the PET host 10 when the second positioning member 2 is mated with the first positioning member 1.

In this embodiment, as shown in fig. 3, the second positioning member 2 includes an elongated plate-like member 21 and a center sleeve 22 provided on the plate-like member 21 and extending perpendicularly thereto. Preferably, the second positioning member 2 further has a calibration member 3 as exemplarily shown in fig. 4, and the calibration member 3 can ensure that the central axis aa 'is kept substantially coincident with the axis BB' of the CT main machine 20 when the PET main machine 10 moves toward the CT main machine 20. Wherein a central sleeve 22 provided on the plate 21 is intended for detachable connection with the calibration member 3. The detachable connection in this embodiment includes a case where the calibration member 3 is removed from the center sleeve 22 after use by inserting the calibration member 3 into and through the center sleeve 22 when necessary, but it is not limited to the above case for those skilled in the art. The central sleeve 22 has a central axis aa'. The length of the plate 21 should be greater than the smallest aperture of the PET mounting plate, and may be 980 mm. In order to ensure that the positioning surface 23 of the second positioning element 2, which is connected to the PET host after being mounted to the PET host, can be perpendicular to the axis AA' of the PET host, the requirement for the flatness of the positioning surface 23 is preferably less than 0.10mm in this embodiment, which helps ensure that the PET host without the rail system provided in this embodiment can be easily aligned and mounted to the CT host by means of the mounting structure.

In order to match the arrangement of the central sleeve 22 on the plate-shaped element 21, a circular hole is precisely cut in the central position of the plate-shaped element 21 corresponding to the central sleeve 22, and the size of the circular hole is preferably 45-55mm, more preferably 50mm, and the tolerance is H7. In this case, "H" represents a basic deviation of 0 in the base hole system. And "7" represents a tolerance rating.

Further preferably, as shown in the enlarged view of fig. 6, in the present embodiment, the inner diameters of both end portions of the center sleeve 22 are smaller than the inner diameters of the remaining portions except the both end portions, so as to form a fit with a large fit clearance, preferably about 0.10mm, between the remaining portions except the both end portions of the center sleeve 22 and the calibration piece 3, thereby facilitating the installation and positioning. Only the parts at the two ends are matched, so that the positioning effect is ensured, the installation difficulty is reduced, and the cost is reduced.

Further, in this embodiment, the outer diameter of the center sleeve 22 may be 45-55mm, and more preferably, may be 50mm with a tolerance of h 7. The overall length of the center sleeve 22 may be 150mm to 250mm, and more preferably may be 200 mm. The internal bore dimension of the center sleeve 22 may be set to correspond to its outer diameter dimension, such as 35-45mm, or alternatively 40mm, with a tolerance of H7. Therefore, the central sleeve 22 can be accurately matched with the calibration piece 3 after the second positioning piece 2 is installed on the PET host, so that the central axis AA 'of the second positioning piece 2 is always fitted with the axis AA' of the PET host without a guide rail system, and the accuracy of the alignment process is ensured.

Optionally, the positioning holes 24 and the through holes 25 are respectively disposed at both ends of the second positioning member 2, so as to quickly and conveniently accurately position and mount the second positioning member 2 on the PET mainframe. The PET host machine 10 is provided with a threaded hole corresponding to the through hole 25, and the threaded hole and the through hole 25 are matched to facilitate positioning and then fasten the second positioning piece 2 on the PET host machine 10 in a threaded manner.

In the present embodiment, there are certain requirements for precision and rigidity of the materials of the second positioning member 2 and the calibration member 3, and in the present embodiment, the plate-shaped member 21 and the central sleeve 22 are preferably made of aluminum materials, such as aluminum material with material number 6061; the calibration member 3 is preferably made of steel since it has a certain length.

The calibration member 3 detachably disposed on the second positioning member 2 preferably has a cylindrical structure with a distal end and a proximal end, and the cross-sectional area of the distal end is smaller than that of the proximal end, so that the central axis aa 'of the second positioning member 2 can easily coincide with the rotation axis BB' of the CT mainframe 20 in the initial installation position of the PET mainframe 10. In the present invention, the end close to the CT main body 20 is a proximal end, and the end far from the CT main body 20 is a distal end, which is also a free end of the calibration member 3. Of course, the calibration piece 3 can have a different configuration, such as the stepped cylindrical part exemplarily shown in the present embodiment, which is precisely machined so that its axis has a straightness of less than 0.50 mm. Further, the calibration piece 3 comprises a mounting end 31, a CT mounting part 32, a PET mounting part 33 and an introduction part 34 which are arranged in sequence from the proximal end to the distal end; the diameters of the mounting end 31, the CT mounting portion 32, the PET mounting portion 33, and the introduction portion 34 are reduced from large to small. In this embodiment, the calibration piece 3 may further include an introduction taper portion 36, one end of the introduction taper portion 36 being connected to the PET mounting portion 33 and having the same diameter as the PET mounting portion 33; the other end of the introduction tapered part 36 is connected to the introduction part 34, and has the same diameter as the introduction part 34, and as shown in fig. 4, the diameter of the introduction tapered part 36 is gradually changed from one end to the other end to guide the second positioning member 2 on the PET main unit 10 to rapidly reach the PET mounting part 33. In order to confirm whether the PET main unit is mounted in place, it is preferable that a marking 35 for marking the mounting of the PET main unit 10 is provided at one end of the PET mounting portion 33 near the introduction tapered portion 36. The marking 35 indicates that the PET main unit is already in position in the Z direction when the end face of the free end of the second positioning element 2 coincides with said marking 35.

Further, the length of the introduction part 34 may be set to 50 to 150mm, and more preferably, may be 100mm, and may have a constant diameter throughout the length thereof, such as 25mm, 30mm, or 35 mm.

Of course, when the second positioning element 2 to which the PET host 10 translates is about to contact the calibration element 3, in order to reduce the requirement for the accuracy of the initial position of the PET host 10, and facilitate the calibration element 3 to be easily aligned and pass through the second positioning element 2 on the PET host, a smaller diameter introduction part is added at the end of the introduction part 34 which first contacts the second positioning element 2 on the PET host 10, and the diameter of the introduction part is 15mm, 20mm or 25mm, the length of the introduction part can also be 50-150mm, and more preferably the length of the introduction part can be 100 mm.

In addition, the second positioning element 2 is further provided with a positioning pin or a positioning hole corresponding to the positioning hole or the positioning pin, so that the second positioning element 2 can be accurately positioned on the PET host 10 and/or the CT host 20.

Preferably, the mounting structure further comprises a first connecting piece arranged on the PET host 10 and a second connecting piece arranged on the second positioning piece 2, and the first connecting piece and the second connecting piece are detachably connected in the mounting process of the PET host 10. The connector may be a threaded fastener as is common in the art.

The PET host machine without the guide rail system provided by the embodiment 1 omits the existing guide rail system, and by means of the installation structure, the PET host machine can be directly and quickly installed in place with other host machines of a multiple image system, so that the floor area is reduced, and the use cost is reduced.

Example 2

In order to achieve the aligned installation of the PET mainframe 10 and the CT mainframe 20 of the rail-less system and facilitate the disassembly of the two for maintenance, the present embodiment describes the installation structure on the CT mainframe 20. Referring to fig. 7 and 8, in the present embodiment, another structure of the second positioning member 2 is provided, and the second positioning member 2 is detachably mounted on the CT mainframe 20 when necessary, so as to facilitate the alignment and installation of the PET mainframe 10 of the rail-less system and the CT mainframe 20.

Fig. 8 shows a CT mainframe 20 with the second positioning element 2 installed thereon, wherein the CT mainframe 20 has a slip ring installation plane perpendicular to the rotation axis BB 'and a rotation axis BB'. The rotating part of the CT mainframe 20 is mounted on the inner ring of the bearing, on which the X-ray tube, the high voltage device and the detector part are also mounted. And the rotating inner ring is also fixedly connected with a mounting structure for mounting the non-guide rail system PET host 10 and the CT host 20.

In this embodiment, the mounting structure is substantially the same as that in embodiment 1, and the same structure will not be described in detail below. The mounting structure comprises a first positioning piece 1 arranged on the CT host 20, a second positioning piece 2 which is accurately positioned through the first positioning piece 1 and detachably connected to the CT host 20, and a calibration piece 3 which is detachably connected to the second positioning piece 2 in a penetrating mode. As shown in fig. 8, the second positioning member 2 can be accurately positioned on the CT mainframe 20 by a first positioning member 1, such as a positioning pin, disposed on the CT gantry.

As shown by way of example in fig. 7, the second positioning element 2 also comprises an elongated plate-like element 21 and a central sleeve 22 arranged on the plate-like element 21 and extending perpendicularly thereto. In the present embodiment, the length of the plate-shaped member 21 connected to the CT main unit 20 only needs to be slightly larger than the inner diameter of the physical aperture of the CT main unit 20, and generally, the physical aperture is 760mm, that is, the length of the plate-shaped member 21 is preferably 880 mm. The flatness of the positioning surface 23 of the second positioning element 2 should preferably be less than 0.10mm, ensuring that the positioning surface 23 is perpendicular to the axis of rotation BB' of the CT mainframe 20 after installation. Meanwhile, the through hole of the second positioning member 2 has a diameter substantially the same as the inner diameter of the central sleeve 22, such as 50-60mm, and more preferably, 55 mm; the through hole has a tolerance of H7, where "H" represents a basic hole fit with a basic deviation of 0 below. And "7" represents a tolerance rating.

In addition, after the second positioning member 2 is positioned on the CT main unit 20, in order to fasten the second positioning member 2 on the CT main unit 20 and prevent the second positioning member 2 from being displaced or falling off to affect the subsequent installation of the imaging device, through holes 25 may be respectively formed at both ends of the second positioning member 2, so that the second positioning member 2 can be detachably connected to the CT main unit 20 by screw fasteners such as screws after being positioned at the correct position on the CT main unit 20.

Preferably, the central sleeve 22 and the plate 21 are integrally formed, and may be detachably connected to the plate 21 by means of a flange and screws. Whatever the arrangement, the central sleeve 22 extends perpendicularly to the plate-like element 21. Specifically, when the central sleeve 22 is screwed to the plate-like member 21, one end of the central sleeve 22 is provided with a flange, the end face of the flange is perpendicular to the inner and outer rings of the central sleeve 22, and the perpendicularity tolerance is less than 0.05 mm. Adopt detachable threaded connection, convenient standardized processing, convenient maintenance reduces the maintenance cost simultaneously.

Optionally, the central sleeve 22 has the same inner diameter along its length. In this embodiment, the outer diameter of the center sleeve 22 may be selected to be 50-60mm, and more preferably, 55mm with a tolerance of h 7. The overall length of the center sleeve 22 may be selected to be 150mm and 250mm, and more preferably, may be 200 mm. The internal bore dimension of the center sleeve 22 may be set to correspond to its outer diameter dimension, such as 40-50mm or 45mm, with a tolerance of H7. In this way, the center sleeve 22 can be kept perpendicular to the second positioning member 2 after the second positioning member 2 is installed on the CT mainframe 20, so as to ensure the accuracy of the alignment process.

Further, since it is necessary to ensure the accuracy of installation, there are specific precision requirements and rigidity requirements for the material for manufacturing the second positioning element 2, the installation structure may be made of a metal material, in this embodiment, the second positioning element 2 is made of an aluminum material, of course, it may also be made of a steel material, and the calibration element 3 is preferably made of a steel material, such as a steel material with a material code number of 45.

As shown in fig. 8, when the second positioning member 2 is mounted on the CT main machine 20, the calibration member 3 passes through the center sleeve 22, so that the central axis aa 'of the second positioning member 2 coincides with the rotation axis BB' of the CT.

In this embodiment, the calibration member 3 and the center sleeve 22 are in clearance fit, and the fit clearance is preferably less than 0.01mm, and meanwhile, the fit of the calibration member 3 and the center sleeve 22 is a full fit over the entire length of the center sleeve 22, so that it can be ensured that the center sleeve 22 is still in a horizontal state after the calibration member 3 is installed, and the deformation amount of the calibration member 3 extending out of the first positioning structure and influenced by gravity is determined by the length of the fit clearance and the fit surface. In the embodiment, the deformation amount can be ensured to be less than half of the allowable error of the system in the Y direction, so that the assembly effect of the PETCT system is ensured.

By adopting the installation structure provided by the embodiment, a support device or a guide rail system on the PET host machine 10 can be omitted, in the installation process and the maintenance process, the accurate installation with the CT host machine 20 can be realized by means of the transportation tool trolley 30 of the PET host machine 10 and the installation structure provided by the embodiment, and the whole process can be conveniently and controllably calibrated.

Example 3

In the present embodiment, the installation method of the above-mentioned PET mainframe without rail system is provided, still taking the PETCT system as an example, specifically, during the installation process, when the PET mainframe 10 without rail system moves towards the CT mainframe 20 for positioning installation, the installation structure in the above-mentioned embodiment makes the axis AA 'of the PET mainframe 10 without rail system always coincide with the rotation axis BB' of the CT mainframe. Therefore, a guide rail system or a similar supporting device arranged at the lower part of the PET host machine in the prior art is omitted, the preparation, use and maintenance costs of the imaging system are reduced, and meanwhile, the occupied area is also reduced.

Preferably, the installation method of the non-guide rail PET host specifically comprises the following steps:

and S10, installing the second positioning piece 2 of the installation structure, and matching the second positioning piece 2 with the first positioning piece 1 to realize that the central axis AA 'of the second positioning piece 2 coincides with the axis AA' of the PET host machine 10.

S20, moving the PET host 10, and moving the PET host 10 toward the CT host 20 to the initial installation position of the PET host 10.

The initial installation position is a position where the second positioning member 2 installed on the PET main unit 10 substantially contacts the distal end of the calibration member extending through the second positioning member 2 of the CT main unit 20. Before the initial installation position is reached, since the PET host 10 is moved to the CT host 20 by the transportation tool cart 30, the moving route of the PET host 10 is not limited to linear motion similar to that on the guide rails, and the PET host 10 can be moved to the CT host 20 relatively freely, and it is not necessary that the axis AA 'of the PET host 10 is aligned with or coincides with the rotation axis BB' of the CT host 20.

S30, calibrating the mounting structure so that the central axis aa 'of the second positioning member 2 substantially coincides with the rotation axis BB' of the CT mainframe.

As described in embodiments 1 and 2, the cross section of the distal end of the calibration member 3 is smaller, so that the distal end of the calibration member 3 can easily pass through the second positioning member 2 on the PET host 10 when the PET host 10 moves from the initial installation position to the CT host 20, and the axis AA ' of the PET host 10, the central axis AA ' of the second positioning member 2 on the PET host 10, and the rotation axis BB ' of the CT host 20 are substantially coincident with each other.

S40, continuing to move the PET host until the PET host reaches its mounting end position, wherein the central axis aa 'is substantially coincident with the rotation axis BB' of the CT host 20.

The installation method of the PET host machine without the guide rail system is not only suitable for first installation, but also suitable for the condition that the PET host machine needs to be removed for maintenance of the sliding ring, and the installation method matched with the installation structure can completely meet the condition of maintenance of the sliding ring and the resetting of the PET host machine without the guide rail system after the maintenance, and ensures the resetting precision.

Specifically, during installation, the position of the CT main machine 20 is adjusted, the horizontal position of the CT main machine is adjusted, the slip ring installation surface is vertical to the horizontal plane, the slip ring installation surface is fixed by using an expansion bolt, and then the calibration member 3 is inserted into the second positioning member 2 installed on the CT main machine 20 with the CT main machine 20 as a reference.

After the calibration piece 3 is installed, it can represent an axis, and this axis is an extension of the rotation axis BB' of the CT mainframe, so it is only necessary to move the PET mainframe 10 without the rail system toward and close to the CT mainframe 20 by means of the transportation tool cart 30, and then align the second positioning piece 2 installed on the PET mainframe 10 with the calibration piece 3 and continue to move the PET mainframe 10 toward the CT mainframe 20 to its installation position, which indicates that the axes of the PET mainframe 10 and the CT mainframe 20 are already coincident, and at this time, if the PET mainframe 10 is not horizontal, adjust it horizontally.

In the actual installation process, in order to facilitate the realizability of engineering, the calibration piece 3 is of a stepped shaft structure, and in such a design, when the PET host 10 is at the installation initial position, the requirement on the position of the PET host is low, after the calibration piece 3 enters the second positioning piece 2 on the PET host 10, the calibration piece slowly moves by adjusting the transport tool trolleys at the four corners, gradually enters the leading-in part 34 of the calibration piece 3, then continuously moves forwards, enters the leading-in conical part 36 of the calibration piece 3, finally enters the PET installation part 33, and when the end surface of the free end of the central sleeve 22 is superposed with the marked line 35, the fact that the Z direction is in place is indicated.

Then, the four feet of the PET main unit 10 are adjusted to effectively contact with the ground to form an effective and stable support, and then the calibration member 3, the second positioning member 2 on the CT main unit 20, and the second positioning member 2 on the PET main unit 10 are removed one by one. To this end, the entire installation alignment process of the PET mainframe without the rail system is completed.

It should be understood that in practical applications, the mechanical adjustment is a first step adjustment, and after a certain accuracy is met, the software compensation can be performed. Since for mechanical alignment mounting, typically the X, Y, Z direction translation is <2 mm; rotation in the XZ, YZ, XY plane <0.1 degrees. Through field implementation, the alignment method provided by the embodiment can well meet the precision requirement, and the scheme has better realizability.

The installation method of the PET host machine without the guide rail system, provided by the invention, can realize the alignment installation in place without any guide rail or supporting device no matter the PET host machine is installed for the first time or is installed again after later maintenance, the installation process is simple and efficient, the maintenance of the guide rail system is omitted, and the cost is effectively reduced.

Although embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are illustrative and not restrictive, and that those skilled in the art may make changes, modifications, substitutions and alterations to the above embodiments without departing from the scope of the present invention.