CN113693614A

CN113693614A - PETCT system alignment device and alignment method thereof

Info

Publication number: CN113693614A
Application number: CN202111000103.4A
Authority: CN
Inventors: 于庆泽
Original assignee: Sinounion Healthcare Inc
Current assignee: Sinounion Healthcare Inc
Priority date: 2021-08-26
Filing date: 2021-08-26
Publication date: 2021-11-26
Anticipated expiration: 2041-08-26
Also published as: CN113693614B

Abstract

A PETCT system alignment device, comprising: a first positioning member having: a first surface perpendicular to a central axis of the subsystem when the first locator is secured to one of the PET subsystem or the CT subsystem; the first positioning structure is arranged on the first positioning piece and extends perpendicular to the first surface, the first positioning structure is provided with a first axis, and the first positioning structure is configured in such a way that when the first positioning piece is fixed on the rack, the first axis of the first positioning structure is superposed with the central axes of the PET subsystem and the CT subsystem; a second positioning member having a second axis representing the central axis, the second positioning member cooperating with the first positioning structure to align the PET subsystem with the CT subsystem. Methods of aligning a PETCT system are also provided. The aligning device and the aligning method of the invention abandon the use of a laser, directly finish the aligning and mounting of the PETCT system under the state that an operator can be identified by naked eyes, have simple structure and are easy to process.

Description

PETCT system alignment device and alignment method thereof

Technical Field

The invention relates to the field of medical equipment, in particular to a PETCT system alignment device and an alignment method thereof.

Background

At present, 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 perfectly integrates PET and CT, the PET provides detailed function, metabolism and other molecular information of the focus, and the CT provides precise anatomical positioning of the focus, so that the diagnosis accuracy is obviously improved.

In practical application, in order to ensure perfect fusion of the PET scan image and the CT scan image, the axes of the PET system and the CT system need to be coincident. To achieve this, in the prior art, alignment is usually performed by simulating an axis with a laser beam emitted by a laser, and then complicated manual adjustment is performed, for example, chinese patent application No. CN 201310095902.3. However, the laser is adopted to emit a laser beam for adjustment, so that a laser beam fitting the CT axis can be found only by repeatedly adjusting the laser beam for many times, and meanwhile, in the installation process, an engineer is required to observe the laser with naked eyes, which is easy to cause harm to eyes of the engineer.

Therefore, chinese patent application No. CN202010073246.7 proposes a calibration device, which abandons the use of the above laser, however, a plurality of through holes with high requirements for position accuracy need to be formed on the frame of the imaging system, and in the installation and calibration process, the through holes need to be completely aligned, which is tedious in process and long in time.

The above problems need to be solved.

Disclosure of Invention

Technical problem to be solved

In order to solve the above problems in the prior art, the present invention provides an aligning device for a PETCT system, which can quickly and simply achieve the aligning installation of PET and CT racks while discarding the laser that may harm human body in the prior art. The alignment device is easy to process, has few parts and low cost; meanwhile, the invention also provides a PETCT system alignment method.

(II) technical scheme

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

in a first aspect, a PETCT system alignment apparatus includes a PET subsystem and a CT subsystem, each having a central axis; the alignment device includes:

a first positioning member having: a first surface perpendicular to the central axis when the first positioning member is secured to one of the PET subsystem gantry or the CT subsystem gantry; the first positioning structure is arranged on the first positioning piece and extends perpendicular to the first surface, the first positioning structure is provided with a first axis, and the first positioning structure is configured in such a way that when the first positioning piece is fixed on the rack, the first axis of the first positioning structure is superposed with the central axes of the PET subsystem and the CT subsystem;

a second positioning member having a second axis characterizing the central axis, the second positioning member cooperating with the first positioning member to align the PET subsystem with the CT subsystem.

Preferably, the first positioning structure is a hollow cylindrical structure;

the first locating formations have the same inner diameter in the direction of their first axes; or

The inner diameter of the two end portions of the first positioning structure is smaller than the inner diameter of the rest parts except the two end portions.

Preferably, the second positioning element is a positioning rod capable of penetrating through the first positioning structure, and the positioning rod and the first positioning structure are in clearance fit.

Preferably, the positioning rod is of a stepped shaft structure and comprises a positioning end, a CT positioning section, a PET positioning section and a guiding-in section which are sequentially arranged; the diameters of the positioning end, the CT positioning section, the PET positioning section and the leading-in section are from large to small;

and one end of the PET positioning section, which is close to the leading-in section, is provided with a positioning marking line for marking the machine frame of the PET subsystem in place.

Preferably, the introduction section includes: a first introduction part, a second introduction part, and an introduction tapered part;

the first lead-in part and the second lead-in part respectively have the same diameter, and the diameter of the second lead-in part is larger than that of the first lead-in part;

the second guiding part is connected with the PET positioning segment through the guiding taper part, and the diameter of the guiding taper part is gradually increased from one end of the second guiding part to one end of the PET positioning segment.

Preferably, the first positioning piece is further provided with positioning pin holes or positioning pins at two ends thereof;

and the rack of the PET subsystem and the rack of the CT subsystem are both provided with positioning pins or positioning pin holes matched with the positioning pin holes or the positioning pins.

Preferably, the first positioning member is further provided with through holes at both ends thereof so as to detachably connect the first positioning member to the frame.

Preferably, the first positioning member is made of aluminum; the second positioning piece is made of steel.

In a second aspect, an alignment method based on the alignment device of the PETCT system includes the following steps:

s1, mounting a first positioning piece, and respectively mounting the first positioning piece to the rack of the PET subsystem and the rack of the CT subsystem;

s2, installing a second positioning piece, and installing the second positioning piece in a first positioning structure of the first positioning piece in a penetrating way, wherein the first positioning piece is a first positioning piece installed on the CT subsystem;

s3, translating the PET subsystem towards the CT subsystem until the second positioning piece passes through and extends out of the first positioning piece on the PET subsystem.

Preferably, the following step is further included after the step of S3:

s4, adjusting the ground feet of the PET subsystem to realize stable support of the PET subsystem; and disassembling the first positioning piece and the second positioning piece.

(III) advantageous effects

The aligning device provided by the invention abandons the use of a laser, directly completes the aligning and mounting of the PETCT system under the condition that an operator can recognize by naked eyes, and has the advantages of less parts, simple structure and easy processing.

In addition, compared with the method for generating the laser line to simulate the axis by using the laser in the prior art, the alignment method provided by the invention is a direct alignment method, avoids the complex process of laser line adjustment, can check the installation alignment condition in the whole process and after installation, and has the advantages of direct convenience, simplicity and reliability.

Because the whole alignment installation process does not need to use an expensive laser and the laser is accurately calibrated, the cost of the auxiliary installation device is effectively reduced.

Drawings

FIG. 1 is a schematic structural view of a PETCT system after alignment installation using the alignment apparatus of the present invention;

fig. 2 is a schematic structural diagram of a first positioning element according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a CT subsystem with a first positioning element mounted thereon according to the present invention;

fig. 4 is a schematic structural diagram of a first positioning element according to another embodiment of the present invention;

FIG. 5 is a schematic structural view of a PET subsystem provided with a first positioning member;

FIG. 6 is a schematic structural view of a second positioning element according to the present invention;

FIG. 7 is a schematic partial cross-sectional view of the second positioning element after being inserted into the first positioning element;

FIG. 8 is an enlarged view of a portion of the structure of FIG. 6;

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

[ description of reference ]

1: a first positioning member; 11: a first surface; 12: a first positioning structure; 13 round hole:

2: a second positioning member; 21: a positioning end; 22: a CT positioning section; 23: a PET positioning section; 24: a lead-in section; 25: positioning the marked line;

241: a first introduction part; 242: a second introduction part; 243: introducing the cone;

3: positioning pins; 4: a positioning pin hole; 5: a through hole;

10: a CT subsystem; 20: a PET subsystem.

Detailed Description

Before the PETCT system is used, in order to ensure that a PET scanning image and a CT scanning image are fused perfectly, the axes of the PET subsystem and the sub-CT system are required to be coincided. In order to achieve the purpose, in the prior art, the alignment of the system is completed by adopting a laser beam emitted by a laser to simulate an axis and matching with complicated manual adjustment; or a plurality of through holes with high requirements on position accuracy need to be formed in a frame of the imaging system, and the through holes need to be completely aligned in the installation and calibration process. The prior art has the disadvantages of complex process, complex alignment process and long time consumption, and the use of the laser is easy to cause harm to eyes of operators.

In order to solve the technical problem and simplify the alignment process of the PETCT system, the invention provides an alignment device of the PETCT system, the PETCT system comprises a PET subsystem and a CT subsystem, and the PET subsystem and the CT subsystem are respectively provided with a central axis; the alignment device includes:

a second positioning member having a second axis characterizing the central axis, the second positioning member cooperating with the first positioning structure to align the PET subsystem and the CT subsystem. In the invention, the first positioning structure can be a positioning sleeve with a hollow inner part, and the second positioning part can adopt a positioning rod structure, so that the PETCT system can be simply and quickly aligned and installed in a mode that the positioning rod penetrates through the positioning sleeve.

For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings. Wherein like parts in different embodiments bear like reference numerals.

Example 1

As shown in fig. 1, in the present embodiment, the alignment device includes a first positioning member 1 and a second positioning member 2. Wherein the first positioning element 1 has a first surface 11 and a first positioning structure 12. When the first positioning member 1 is fixed to the frame of the CT-subsystem, the first surface 11 is perpendicular to the rotation axis of the CT-subsystem, i.e. the central axis AA' of the CT-subsystem.

Wherein, the rotation axis of the CT is the rotation central axis of the bearing, the rotation part of the CT is arranged on the inner ring of the bearing, and the X-ray tube, the high-voltage device and the detector part are arranged on the inner ring. An alignment device for mounting the CT frame is fixed on the rotary inner ring. The alignment device is an auxiliary tool in the installation process, is disassembled after the installation is finished, and then is opened for normal work by CT.

The first positioning structure 12 is disposed on the first surface 11 and extends perpendicular to the first surface 11, the first positioning structure 12 has a first axis, and the first positioning structure 12 is configured such that, when the first positioning member 1 is fixed to the CT gantry, the first axis of the first positioning structure 12 coincides with the central axis AA 'of the CT subsystem, so that the first axis of the first positioning structure 12 can represent the central axis AA' of the CT subsystem.

The first positioning structure 12 is disposed on the first surface 11, including but not limited to, the first positioning structure 12 is integrally formed on the first surface 11 of the first positioning member 1, or the first positioning structure 12 may be detachable, such as screwed to the first positioning member 1, and no matter how the arrangement manner is, the first axis of the first positioning structure 12 needs to be perpendicular to the first surface 11.

In the present embodiment, the first positioning member 1 may be, but not limited to, in the form of a positioning plate, which may be rectangular, a strip having a uniform width, a strip having a wide center, and two narrow ends, or the like. The first locator form 12 may be a cylindrical structure, such as a locator sleeve, that is hollow on the inside.

Optionally, the positioning sleeve has the same inner diameter in the direction of its first axis. The positioning sleeve can be arranged at the center of the positioning plate, and as mentioned above, the positioning sleeve can be integrally formed with the positioning plate, or can be connected to the positioning plate through a screw. When the positioning plate is connected with the positioning plate through the screws, in order to ensure the connection reliability, a flange can be arranged at the connecting end of the positioning sleeve, and the positioning sleeve is tightly connected with the positioning plate through the flange and the screws.

On the positioning plate, a round hole 13 is precisely machined corresponding to the position of the positioning sleeve, and the size of the round hole 13 is basically consistent with the inner diameter of the positioning sleeve, for example, the size of the round hole 13 can be 50-60mm, and more preferably can be 55 mm; the tolerance of the circular hole 13 is H7, where "H" represents a basic tolerance of the base hole system with a lower deviation of 0. And "7" represents a tolerance rating.

In this embodiment, the overall length of the positioning plate may be 880mm, but it is understood that the overall length of the positioning plate only needs to be slightly larger than the inner diameter of the physical aperture of the CT subsystem to which it is to be mounted, and generally, the physical aperture of the CT subsystem is 760 mm. The flatness requirement for the first surface 11 of the positioning plate is high, less than 0.10mm, which ensures that the first surface 11 of the positioning plate is perpendicular to the axis of rotation of the CT after mounting.

The outer diameter of the positioning sleeve may likewise be 50-60mm, more preferably 55mm, with a tolerance of h 7. The overall length of the positioning sleeve may be 150mm to 250mm, and more preferably may be 200 mm. The internal bore of the positioning sleeve may be dimensioned to correspond to its external diameter, for example 40-50mm, optionally 45mm, to a tolerance of H7. Therefore, after the positioning plate is arranged on the CT frame and matched with the second positioning piece, the axis of the positioning sleeve can be always matched with the axis of the rotating shaft of the CT, and the accuracy of the alignment process is ensured.

When the locating sleeve is in threaded connection with the locating plate, one end of the locating sleeve can be provided with a flange, the end face of the flange is perpendicular to the inner ring and the outer ring of the locating sleeve, namely the end face of the flange is perpendicular to the first axis of the locating sleeve, and the tolerance of the flange is smaller than 0.05 mm. The positioning sleeve and the positioning plate are in threaded connection, so that the positioning sleeve and the positioning plate are conveniently machined in a standardized mode, meanwhile, the maintenance is convenient, and the maintenance cost is reduced.

As shown in fig. 2, the positioning plate may further have positioning pin holes 4 and through holes 5 at both ends thereof. The positioning pin holes 4 are used for being conveniently matched with positioning pins on the CT rack when the positioning plate is installed on the CT rack, so that an operator can install the positioning plate in place at the first time; the through hole 5 is used for fastening and connecting the positioning plate on the CT frame after positioning, and therefore, the through hole 5 can also be a threaded hole. In this embodiment, the number of the positioning pin holes 4 and the through holes 5 is not limited, and may be 2 positioning pin holes and 2 to 4 through holes.

The first axis of the positioning sleeve can be indicative of the axis of rotation of the CT when the first positioner is mounted to the CT gantry. In contrast, in this embodiment, since there are specific accuracy requirements and rigidity requirements for the materials for preparing the positioning plate and the positioning sleeve, the positioning plate and the positioning sleeve may be made of metal materials, and in this embodiment, both the positioning plate and the positioning sleeve may be made of steel materials, such as steel materials with a material code of 45.

In this embodiment, with the second setting element complex, specifically be locating sleeve's first location structure, because adopt clearance fit with the second setting element, and the cooperation clearance is preferred to be less than 0.01mm, and simultaneously, cooperation between them all is comprehensive cooperation on whole locating sleeve's length, after can guaranteeing the installation of second setting element like this, this second setting element still is in a horizontally state, the one end that the second setting element stretches out first location structure has been decided to complex clearance and fitting surface length, the deformation volume that receives the influence of gravity, in this embodiment, can guarantee that this deformation volume is less than the system in half of the ascending permissible error of Y side, with this assembly effect of ensureing the PETCT system.

Example 2

In this embodiment, the same structure and arrangement as those in embodiment 1 are not described again.

As shown in fig. 3 and 4, the present embodiment provides another specific structure of the first positioning member 1.

Fig. 4 shows a schematic view of the first positioning element 1 mounted on the gantry of the PET subsystem. For the PET host, the PET detector is installed on a PET installation plate, the PET installation plate is a metal aluminum plate or a metal steel plate which is processed regularly, so the axis of the PET installation plate is the axis of the metal plate, and the detector is accurately installed on the metal plate, so the axis of the detector is coincident with the axis of the metal plate.

In this embodiment, as shown in fig. 3, the first positioning member 1 is selected as a rectangular positioning plate, and the length thereof should be larger than the minimum aperture of the PET mounting plate, and in this embodiment, may be 980 mm. The positioning plate also has a first surface 11 with a high flatness requirement, and the flatness of the first surface 11 is less than 0.10mm, so that the first surface 11 can be perpendicular to the central axis of the PET after the positioning plate is installed on the PET rack. More preferably, the positioning plate may have a second surface disposed opposite and parallel to the first surface 11.

The center position of the positioning plate is accurately provided with a round hole 13 corresponding to the positioning sleeve, the size of the round hole is 45-55mm, more preferably 50mm, and the tolerance is H7.

In the present embodiment, the first positioning structure 12 may also be a positioning sleeve, and the inner diameter of the two end portions of the positioning sleeve is smaller than that of the rest portions except the two end portions, as shown in fig. 8, unlike in embodiment 1.

Thus, when the positioning rod is matched with the positioning sleeve of the positioning plate on the PET rack, the fit with larger fit clearance, such as the fit clearance of about 0.10mm, can be adopted for convenient installation and positioning; meanwhile, the matching surfaces of the two parts are not matched in the full-length range, and as shown in fig. 8, only the two ends of the positioning sleeve are partially matched, so that the positioning effect is ensured, the installation difficulty is reduced, and the cost is reduced.

Furthermore, the outer diameter of the positioning sleeve may be 45-55mm, more preferably 50mm, with a tolerance of h 7. The overall length of the positioning sleeve may be 150mm to 250mm, and more preferably may be 200 mm. The internal bore of the positioning sleeve may be dimensioned to correspond to its external diameter, for example 35-45mm, optionally 40mm, to a tolerance of H7. Like this, can ensure that the locating plate is installed behind the PET frame to and after cooperating with the second setting element, can both make the axis of location sleeve remain throughout with the PET central axis fit, in order to ensure the accuracy of alignment process.

Two pin holes and four through holes are arranged at two ends of the positioning plate so as to quickly and conveniently accurately position and install the positioning plate on the PET rack.

In the present embodiment, the positioning plate and the positioning sleeve are made of the same material, which has the definite accuracy requirement and rigidity requirement, so in the present embodiment, the positioning plate and the positioning sleeve are preferably made of aluminum material, such as aluminum material with the material code 6061.

After the first positioning member of the present embodiment is installed, the first axis of the positioning sleeve can also represent the central axis of the PET.

Example 3

As shown in fig. 5, the second positioning member 2, which is used to pass through the first positioning member 1 and protrude, in the present embodiment, can be a positioning rod having a substantially cylindrical shape, the positioning rod having a second axis capable of representing the rotation axis of the CT subsystem and the detector axis of the PET subsystem, and the positioning rod and the first positioning structure 12 are in clearance fit. The locating rod is preferably a stepped shaft-like part which is precisely machined to have an axis with a straightness of less than 0.50 mm.

The positioning rod preferably adopts a stepped shaft structure and comprises a positioning end 21, a CT positioning section 22, a PET positioning section 23 and a guiding-in section 24 which are sequentially arranged; the diameters of the positioning end 21, the CT positioning section 22, the PET positioning section 23 and the guiding-in section 24 are from large to small.

One end of the PET positioning section 23, which is close to the leading-in section 24, is provided with a positioning marking line 25 for marking the positioning of the rack of the PET subsystem.

Wherein, the lead-in section 24 may further include: a first introduction part 241, a second introduction part 242, and an introduction tapered part 243; the lengths of the first and

second introduction parts

241 and 242 may be set to 50 to 150mm, and more preferably, may be 100 mm.

Alternatively, the first introduction part 241 has a constant diameter over its entire length, which may be 15mm, 20mm or 25 mm; the second introduction part 242 may also have the same diameter throughout its length, such as 25mm, 30mm or 35mm, and the diameter of the second introduction part 242 is greater than the diameter of the first introduction part 241; the diameters of the first and

second introduction portions

241 and 242 may be set in consideration of the fact that when the PET subsystem approaches the CT subsystem, the requirement for the initial position of the PET rack is low, and the positioning rod is convenient to align easily and pass through the first positioning structure 12 of the first positioning member 1 installed on the PET subsystem.

Further, the guiding taper portion 243 connects the second guiding portion 242 and the PET positioning segment 23, the guiding taper portion 243 gradually increases in diameter from one end of the second guiding portion 242 to one end of the PET positioning segment 23, the guiding taper portion 243 is arranged to guide the positioning sleeve of the positioning plate on the PET frame to quickly reach the PET positioning segment 23, and when the end surface of the free end of the positioning sleeve coincides with the positioning marked line 25, it indicates that the PET subsystem is in place in the Z direction.

Because the positioning rod is in a slender columnar structure and needs to meet certain strength and rigidity, the positioning rod is generally a metal rod piece, and steel is preferably adopted to prepare the positioning rod in the embodiment so as to meet the rigidity requirement in use.

By adopting the positioning plate and the positioning rod, the alignment and installation of the PETCT system can be directly completed under the state that the naked eyes of operators can recognize, and the alignment device has the advantages of small number of parts, simple structure and easy processing.

Example 4

In the present embodiment, an alignment method for aligning and installing the PETCT system using the alignment device of the above embodiments is provided.

As shown in fig. 9, the alignment method includes the steps of:

s1, mounting a first positioning piece 1, and respectively mounting the first positioning piece 1 to a rack of the PET subsystem and a rack of the CT subsystem;

s2, installing a second positioning piece 2, and installing the second positioning piece 2 in a first positioning structure 12 of the first positioning piece 1 in a penetrating manner, wherein the first positioning piece 1 is the first positioning piece 1 installed on the CT subsystem;

and S3, translating the PET subsystem towards the CT subsystem, and extending the second positioning part 2 through the first positioning part 1 on the PET subsystem.

S4, adjusting the ground feet of the PET subsystem to realize stable support of the PET subsystem; and disassembling the first positioning piece 1 and the second positioning piece 2.

Compared with the method for generating the laser line to simulate the axis by using the laser in the prior art, the alignment method provided by the invention is a direct alignment method, avoids the complex process of laser line adjustment, can check the installation alignment condition in the whole process and after installation, and has the advantages of direct convenience, simplicity and reliability.

Specifically, during installation, the position of the CT subsystem is adjusted, the horizontal position of the CT subsystem is adjusted, the slip ring installation surface is vertical relative to the horizontal plane, the slip ring installation surface is fixed through expansion bolts, and then the positioning rod is inserted into a positioning sleeve of a positioning plate installed on the CT subsystem by taking the CT subsystem as a reference.

After the positioning rod is installed, the positioning rod can represent an axis which is an extension line of a CT rotation axis, so that the axes of the PET subsystem and the CT subsystem are overlapped only by approaching the PET subsystem and inserting the positioning sleeve of the positioning plate installed on the PET subsystem into the positioning rod, and at the moment, if the PET subsystem is not horizontal, the PET subsystem is adjusted to be horizontal.

In the actual installation process, in order to facilitate the realizability of engineering, the positioning rod is in a stepped shaft structure, the position requirement is low when the PET subsystem starts to approach, after the positioning rod enters the PET subsystem, the positioning rod slowly moves through the transportation tools for adjusting four corners, gradually enters the second guiding part 242 of the positioning rod, then continuously moves forwards to enable the positioning rod to enter the guiding cone part 243 of the positioning rod, finally enters the PET positioning section 23, and when the end surface of the free end of the positioning sleeve is overlapped with the positioning marked line 25, the Z direction is already in place.

Then, adjust four lower margins of PET subsystem, make its effectual and ground contact, form effective and stable support, then pull down the locating lever in proper order, first locating part 1 on the CT subsystem, first locating part 1 on the PET subsystem. At this point, the entire installation alignment process is complete.

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.

And because no expensive laser is needed in the whole alignment installation process and laser calibration is accurately carried out, the cost of the auxiliary installation device is effectively reduced.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; either as communication within the two elements or as an interactive relationship of the two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

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.

Claims

1. A PETCT system alignment device, the PETCT system comprising a PET subsystem and a CT subsystem, the PET subsystem and CT subsystem each having a central axis; characterized in that said alignment means comprise:

2. The alignment device of claim 1,

the first positioning structure is a hollow cylindrical structure;

3. The alignment device of claim 1,

the second positioning piece is a positioning rod capable of penetrating through the first positioning structure, and the positioning rod is in clearance fit with the first positioning structure.

4. The alignment device of claim 3,

the positioning rod is of a stepped shaft structure and comprises a positioning end, a CT positioning section, a PET positioning section and a guiding-in section which are sequentially arranged; the diameters of the positioning end, the CT positioning section, the PET positioning section and the leading-in section are from large to small;

5. The alignment device of claim 4,

the lead-in section includes: a first introduction part, a second introduction part, and an introduction tapered part;

6. The alignment device of claim 1,

the first positioning piece is also provided with positioning pin holes or positioning pins at two ends of the first positioning piece;

7. The alignment device of claim 6,

the first positioning piece is further provided with through holes at two ends of the first positioning piece, so that the first positioning piece can be detachably connected to the rack.

8. The alignment device of claim 1,

the first positioning piece is made of aluminum; the second positioning piece is made of steel.

9. An alignment method based on the PETCT system alignment device of any one of claims 1-8, comprising the following steps:

10. The alignment method as claimed in claim 9, further comprising the step of, after said S3: