Laser positioning device and PET-CT equipment

Abstract

The present invention discloses a laser positioning device and a PET-CT device. The device includes a first collimator and a second collimator. The first collimator includes a first substrate, a first bottom plate, a first adjustment frame and a first laser. The first substrate and the first adjustment frame are respectively arranged at two opposite ends of the first bottom plate. First substrate mounting holes are arranged at two ends of the first substrate. The first substrate is provided with a first substrate hole. The first adjustment frame is provided with a first laser. The light outlet of the first laser corresponds to the first substrate hole. The second collimator is provided with a second substrate hole. The second substrate hole and the first substrate hole are located on the same straight line after installation. The PET-CT device includes a laser positioning device. The first collimator is installed on the CT device, and the second collimator is installed on the PET device. The present invention has a simple structure, low cost, high alignment accuracy, and convenient operation. It can significantly improve the alignment of the central axis of the PET-CT scanning hole and improve the detection quality of the PET-CT.

Description

Technical Field

[0001] The present invention relates to a positioning device, and more specifically to a laser positioning device and a PET-CT device in the field of medical devices. Background Art

[0002] PET-CT is a new type of medical examination equipment, which organically combines PET (positron emission tomography) equipment and CT (computer tomography) equipment. Through the back-end image processing workstation, PET images and CT images are organically fused to form PET-CT images. Since CT can display the cross-sectional or three-dimensional images of the examined part of the object being examined, PET images can obtain the dynamic physiological metabolic changes of each organ or tissue of the object being examined. Therefore, PET-CT provides much more prediction and treatment information than single PET and CT. It surpasses the existing fields of single PET and single CT, and can complete all the functions of ultra-high-end CT and PET. It is more efficient than simple PET by more than 60%, and can also provide more accurate and faster myocardial and cerebral blood perfusion functional images than CT. PET-CT fusion images can well describe the effect of diseases on biochemical processes, distinguish physiological and pathological uptake, detect early signs of disease before anatomical evidence is obtained, and provide the best treatment plan and screen the most effective treatment drugs for the clinic to correctly determine the planned target area of ​​radiotherapy, detect drugs and radiotherapy effects during treatment.

[0003] Since the CT device and the PET device in the PET-CT device are usually placed side by side, the aperture centers of the PET device and the CT device should be kept consistent. During the scanning examination, the medical examination bed is used to first send the subject to the CT device for CT scanning to obtain CT images, and then the same medical examination bed is used to send the subject to the PET device for PET scanning to obtain PET images. During this process, if the center of the device cannot be kept consistent, there will be a large error in the PET-CT image fusion. Therefore, the PET-CT device has a very high requirement for the center alignment of the device aperture.

[0004] However, the alignment devices in the prior art often fail to meet the above requirements and have problems such as complex devices, high costs, insufficient alignment accuracy, and inconvenient alignment operations, which affect the detection quality of PET-CT. Summary of the invention

[0005] The object of the present invention is to provide a laser positioning device to solve at least one of the above problems.

[0006] The laser positioning device provided by the present invention comprises a first collimator and a second collimator, wherein the first collimator comprises a first substrate, a first bottom plate, a first adjustment frame and a first laser, wherein the first substrate and the first adjustment frame are respectively arranged at opposite ends of the first bottom plate, first substrate mounting holes are arranged at both ends of the first substrate, a first substrate hole is arranged on the first substrate, a first laser is arranged on the first adjustment frame, and a light outlet of the first laser corresponds to the first substrate hole; second substrate mounting holes are arranged at both ends of the second collimator, a second substrate hole is arranged on the second collimator, and the second substrate hole and the first substrate hole are located on the same straight line after installation and adjustment.

[0007] According to one embodiment of the present invention, a first bottom plate is provided with a first bottom plate scribe line, the extension direction of which is perpendicular to the plane where the first substrate is located, and the extension direction of which is parallel to the extension direction of the first substrate hole.

[0008] According to one embodiment of the present invention, two first side panels arranged parallel to each other are further provided on the first bottom plate, the first side panels are respectively connected to the first substrate and the first bottom plate, the planes where the first side panels are located are respectively perpendicular to the planes where the first substrate and the first bottom plate are located, and the first side panel is provided with a first side panel engraving line parallel to the extension direction of the first substrate hole.

[0009] According to an embodiment of the present invention, the height of the first side plate scribe line is the same as the height of the center of the first substrate hole.

[0010] According to an embodiment of the present invention, the second collimator further comprises a second substrate, the second substrate mounting holes are arranged at two ends of the second substrate, and the second substrate hole is located at the center of the second substrate.

[0011] According to one embodiment of the present invention, the second collimator further includes a second base plate and a second adjustment frame, the second adjustment frame and the second substrate are respectively arranged at opposite ends of the second base plate, the second adjustment frame is provided with a second laser, and the light outlet of the second laser corresponds to the second substrate hole.

[0012] According to one embodiment of the present invention, a second bottom plate is provided with a second bottom plate scribe line, the extension direction of which is perpendicular to the plane where the second substrate is located, and the extension direction of which is parallel to the extension direction of the second substrate hole.

[0013] According to one embodiment of the present invention, two second side panels arranged parallel to each other are further provided on the second bottom plate, the second side panels are respectively connected to the second substrate and the second bottom plate, the planes where the second side panels are located are respectively perpendicular to the planes where the second substrate and the second bottom plate are located, and the second side panel is provided with a second side panel engraving line parallel to the extension direction of the second substrate hole.

[0014] According to an embodiment of the present invention, the height of the second side plate scribe line is the same as the height of the center of the second substrate hole.

[0015] According to an embodiment of the present invention, an observation window is provided on the first substrate, the first bottom plate or the second substrate, the second bottom plate.

[0016] According to an embodiment of the present invention, the laser positioning device further includes a third collimator, and a third substrate hole is arranged on the central axis of the third collimator.

[0017] According to an embodiment of the present invention, the laser positioning device further includes a fourth collimator, and a fourth substrate hole is arranged on the central axis of the fourth collimator.

[0018] The present invention also provides a PET-CT device, which includes a CT device and a PET device arranged side by side. The PET-CT device includes the laser positioning device described in any one of the above embodiments, the first collimator is installed on the CT device through the first substrate mounting hole, and the second collimator is installed on the PET device through the second substrate mounting hole.

[0019] The laser positioning device provided by the present invention has a simple structure, low cost, high alignment accuracy, convenient alignment operation, and is easy to disassemble. When the laser positioning device is applied to PET-CT, it can significantly improve the alignment of the central axis of the PET-CT scanning hole, and at the same time improve the alignment of the object to be measured installed on the scanning bed and the central axis of the PET-CT scanning hole, which is indirectly beneficial to improving the detection quality of PET-CT. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 is a schematic diagram of the spatial arrangement of a laser positioning device according to a preferred embodiment of the present invention;

[0022] Figure 2 is based on Figure 1 A three-dimensional schematic diagram of a first collimator of a laser positioning device;

[0023] Figure 3 is based on Figure 1 A three-dimensional schematic diagram of a second collimator of a laser positioning device;

[0024] Figure 4 is based on Figure 1 A three-dimensional schematic diagram of a third collimator of a laser positioning device;

[0025] Figure 5 is based on Figure 1 A three-dimensional schematic diagram of a fourth collimator of a laser positioning device;

[0026] Figure 6 is based on Figure 1 Schematic diagram of the use of the laser positioning device. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with specific examples. It should be understood that the following examples are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0028] It should be noted that when a component / part is referred to as being "set on" another component / part, it may be directly set on the other component / part or there may also be an intermediate component / part. When a component / part is referred to as being "connected / coupled" to another component / part, it may be directly connected / coupled to the other component / part or there may be an intermediate component / part at the same time. The term "connection / coupling" as used herein may include electrical and / or mechanical physical connections / couplings. The term "includes / comprising" as used herein refers to the presence of a feature, step or component / part, but does not exclude the presence or addition of one or more other features, steps or components / parts. The term "and / or" as used herein includes any and all combinations of one or more relevant listed items.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0030] In addition, in the description of this application, the terms "first", "second", etc. are only used for descriptive purposes and to distinguish similar objects. There is no order of precedence between the two, and they cannot be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "plurality" is two or more.

[0031] Figure 1 is a schematic diagram of the spatial arrangement of a laser positioning device according to an embodiment of the present invention, Figure 1 It can be seen that the laser positioning device provided by the present invention includes a first collimator 50, a second collimator 60, a third collimator 70 and a fourth collimator 80, wherein the first collimator 50 is located between the second collimator 60 and the third collimator 70, and the third collimator 70 is located between the first collimator 50 and the fourth collimator 80; the first collimator 50 is provided with a first substrate hole 511 and a first laser 55, the first substrate hole 511 and the first laser 55 are arranged spaced apart and opposite to each other, and the light outlet of the first laser 55 corresponds to the first substrate hole 511; the second collimator 60 is provided with a second substrate hole 611 and a first substrate hole 611. 11 and the second laser 66, the second substrate hole 611 and the second laser 66 are arranged to be spaced apart and opposite to each other, and the light outlet of the second laser 66 corresponds to the second substrate hole 611; the third collimator 70 is provided with a third substrate hole 711; the fourth collimator is provided with a fourth substrate hole 811; the first substrate hole 511, the second substrate hole 611, the third substrate hole 711 and the fourth substrate hole 811 are located on the same straight line, and the first collimator 50 and the second collimator 60 are arranged opposite to each other, that is, the first substrate hole 511 and the second substrate hole 611 are located between the first laser 55 and the second laser 66.

[0032] More specifically, Figure 2 is based on Figure 1 A three-dimensional schematic diagram of a first collimator 50 of a laser positioning device, Figure 2It can be seen that the first collimator 50 also includes a first substrate 51, a first bottom plate 52, a first side plate 53 and a first adjustment frame 54, wherein the first substrate 51 is in the shape of a long plate, a first substrate hole 511 is provided at the center of the first substrate 51, the size of the first substrate hole 511 is preferably such that the laser beam can be just transmitted, and symmetrically arranged first substrate mounting holes 512 are provided at both ends of the first substrate 51, and the first substrate mounting holes 512 cooperate with bolts to mount the first substrate 51 on a device that needs to be aligned; the first bottom plate 52 is in the shape of a flat plate and is vertically fixed to the first substrate 51, a first bottom plate engraved line 521 is provided on the first bottom plate 52, the extension direction of the first bottom plate engraved line 521 is perpendicular to the length direction of the first substrate 51, and the plane formed by the first bottom plate engraved line 521 and the first substrate hole 511 is perpendicular to the plane where the first substrate 51 is located, that is, the first bottom plate engraved line 5 21 is parallel to the extension direction of the first substrate hole 511; two flat-plate-shaped first side plates 53 are arranged in parallel with each other, and the planes where the first side plates 53 are located are respectively perpendicular to the planes where the first substrate 51 and the first bottom plate 52 are located, and the first side plate is provided with a first side plate engraved line 531 extending along its own length direction, and the first side plate engraved line 531 is parallel to the first bottom plate engraved line 521, and the height of the first side plate engraved line 531 is the same as the height of the first substrate hole 511; the first adjustment frame 54 is fixed on the first bottom plate 52, and the first adjustment frame 54 and the first substrate 51 are respectively located at opposite ends of the first bottom plate 52, and the first adjustment frame 54 is provided with a first laser 55, and the first adjustment frame 54 can adjust the position of the light outlet of the first laser 55 from different dimensions, so that the laser emitted by the first laser 55 can pass through the first substrate hole 511.

[0033] Further, Figure 3 is based on Figure 1 A three-dimensional schematic diagram of a second collimator 60 of a laser positioning device, Figure 3It can be seen that the second collimator 60 also includes a second substrate 61, a second bottom plate 62, a second pair of plates 63, a second side plate 64 and a second adjustment frame 65, wherein the second substrate 61 is in the shape of a long plate, a second substrate hole 611 is provided at the center of the second substrate 61, and the size of the second substrate hole 611 is preferably such that the laser beam can pass through, and symmetrically arranged second substrate mounting holes are also provided at both ends of the second substrate 61, and the second substrate mounting holes cooperate with bolts 612 to mount the second substrate 61 on the equipment that needs to be aligned; the second bottom plate 62 is in the shape of a flat plate and is aligned with the second substrate The second bottom plate 61 is vertically fixed, and a second bottom plate scribed line 621 is arranged on the second bottom plate 62, and the extension direction of the second bottom plate scribed line 621 is perpendicular to the length direction of the second substrate 61, and the plane formed by the second bottom plate scribed line 621 and the second substrate hole 611 is perpendicular to the plane where the second substrate 61 is located, that is, the extension direction of the second bottom plate scribed line 621 is parallel to the extension direction of the second substrate hole 611; the second pair of plates 63 in a flat plate shape is arranged on the second bottom plate 62, and the plane where the second pair of plates 63 is located is perpendicular to the plane where the second bottom plate 62 is located and parallel to the plane where the second substrate 61 is located, and the second The pair of plates 62 is provided with a second pair of plate holes 631, the connecting line between the second pair of plate holes 631 and the first substrate hole 611 is parallel to the second bottom plate engraved line 621, and the height of the second pair of plate holes 631 is the same as the height of the first substrate hole 611; two flat second side plates 64 are arranged parallel to each other, the planes where the second side plates 64 are located are respectively perpendicular to the planes where the second substrate 61 is located and the planes where the first bottom plate 62 is located, the second side plates 64 are located between the second substrate 61 and the second pair of plates 63, and the second side plates 64 are provided with second side plate engraved lines extending along their own length direction 641, the second side plate engraved line 641 is parallel to the second bottom plate engraved line 621, and the height of the second side plate engraved line 641 is the same as the height of the second substrate hole 611; the second adjustment frame 65 is fixed on the second bottom plate 62, and the second adjustment frame 65 and the second substrate 61 are respectively located at two opposite ends of the second bottom plate 62, and the second adjustment frame 65 is provided with a second laser 66, and the second adjustment frame 65 can adjust the position of the light outlet of the second laser 66 from different dimensions, so that the laser emitted by the second laser 66 can pass through the second pair of plate holes 631 and the second substrate hole 611.

[0034] It should be understood by those skilled in the art that, in the above-mentioned first collimator and the second collimator, the positions of the first substrate mounting hole, the second substrate mounting hole, and the first substrate hole and the second substrate hole are preferably symmetrically arranged about the central axis. In fact, the first substrate mounting hole and the second substrate mounting hole are arranged symmetrically for the convenience of installation and positioning. Those skilled in the art can install the first substrate and the second substrate on the PET device or the CT device by other means, as long as the first substrate hole and the second substrate hole can be located at the center of the scanning hole respectively, which will not be repeated here. It is worth noting that in order to reduce the weight of the equipment and facilitate observation of whether the laser beam is parallel to the scribed line, the second substrate observation holes 613, 622, 642, etc. are respectively arranged on the second substrate 61, the second bottom plate 62 and the second side plate 64, which will not be repeated here. In addition, it should be understood by those skilled in the art that the design of the above-mentioned observation hole is also applicable to the first collimator 50, which will not be repeated here.

[0035] Figure 4 is based on Figure 1 A three-dimensional schematic diagram of a third collimator 70 of a laser positioning device, Figure 4 It can be seen that the third collimator 70 includes a third substrate 71 and a third bottom plate 72, both of which are flat and vertically connected to each other, wherein bolt holes 712 are provided at both ends of the third substrate 71, and the bolt holes 712 can be used to fix the object to be tested, and a third substrate hole 711 is provided on the center line of the third substrate 71. It is worth noting that the third substrate hole 711 can be a narrow through hole; a bolt hole 721 is provided on the third bottom plate 72, and the bolt hole 721 can be used to fix the third collimator 70; in order to enhance the strength and load-bearing capacity of the third collimator 70, the third collimator 70 also includes a third rib plate 73, which is arranged relatively and perpendicular to the planes where the third substrate 71 and the third bottom plate 72 are located. The third collimator 70 can be used as a mounting tool for a prosthesis. When in use, the positioning mark on the prosthesis can be aligned with the positioning mark of the third substrate hole 711, which will not be repeated here.

[0036] Figure 5 is based on Figure 1 A three-dimensional schematic diagram of a fourth collimator 80 of a laser positioning device, Figure 5 It can be seen that the fourth collimator 80 includes a fourth substrate 81 and a fourth bottom plate 82, both of which are flat and vertically connected to each other, wherein a fourth substrate hole 811 is arranged on the center line of the fourth substrate 81, and the fourth substrate hole 811 can be a narrow through hole; a bolt hole is arranged on the fourth bottom plate 82, and the bolt hole can be used to fix the fourth collimator 80.

[0037] Figure 6 is a schematic diagram of the installation and use of a laser positioning device according to a preferred embodiment of the present invention, comprising Figure 6 Combination Figure 1 It can be known that the PET-CT device usually includes a CT device 10 and a PET device 20 arranged side by side, the CT device 10 and the PET device 20 respectively have a cylindrical CT scanning hole and a PET scanning hole, the CT device 10 and the PET device 20 are respectively installed on a bracket 30, and a scanning bed 40 is arranged on a side close to the CT device 10, and a bed board 41 is arranged on the top of the scanning bed 40. When the PET-CT is in use, the patient or the prosthesis is first sent into the scanning hole of the CT device 10 using the examination bed 40 for CT scanning, and then the patient or the prosthesis is sent into the scanning hole of the PET device 20 for PET scanning. In order to improve the quality of the fusion of PET images and CT images, it is required that the scanning holes of the CT device and the PET device should be aligned when they are installed, that is, the central axis of the scanning hole should be located on the same straight line. At this time, the laser positioning device provided by the present invention can be used for alignment. To this end, firstly, the first collimator 50 is installed on the frame of the CT device 10 through the first substrate mounting hole 512 and the bolts. Since the CT device 10 can reserve a corresponding mounting position and the first substrate hole 511 is located at the center of the first substrate 51, when the first collimator 50 is installed, the first substrate hole 511 is located on the central axis of the CT scanning hole; further, the light outlet of the first laser 55 is adjusted by the first adjustment frame 54 so that the laser emitted by the first laser 55 passes through the first substrate hole 511; after the laser passes through the first substrate hole 511, it is also possible to determine whether the laser beam coincides with the center of the CT scanning hole by rotating the CT device to check the change of the laser spot. When the CT device rotates, when the spot corresponding to the laser beam is basically at the same point, it can be determined that the laser beam coincides with the central axis of the CT scanning hole.

[0038] It is worth noting that a horizontal laser and a vertical laser are installed at the horizontal center position and the vertical center position of the scanning hole of the CT device or the PET device, respectively. When the first collimator or the second collimator is installed, the horizontal laser can be adjusted to correspond to the first side plate engraving line or the second horizontal engraving line, and the vertical laser can be further adjusted to correspond to the first bottom plate engraving line or the second bottom plate engraving line, so as to calibrate the position of the central axis of the scanning hole. When the patient or prosthesis needs to be positioned during scanning, the positioning can be completed by the horizontal laser and the vertical laser to ensure that the position of the patient or the prosthesis is consistent with the central axis during scanning.

[0039] After the first collimator 50 is adjusted, the second collimator 60 is further installed on the frame of the PET device. Since the PET device 20 can also reserve a corresponding installation position and the second substrate hole 611 is located at the center of the second substrate 61, after the second collimator 60 is installed, the second substrate hole 611 is also located on the central axis of the PET scanning hole. At this time, it can be judged whether the frame of the PET device is installed in place by observing whether the laser beam emitted by the first laser 55 passes through the first substrate hole 511, the second substrate hole 611 and the second pair of plate holes 631 at the same time; when the laser beam emitted by the first laser 55 can pass through the first substrate hole 511, the second substrate hole 611 and the second pair of plate holes 631 at the same time, it means that the central axes of the CT device and the PET device coincide.

[0040] Furthermore, after the above steps are completed, it is necessary to determine whether the central axis of the prosthesis coincides with the central axis of the CT device and the PET device. At this time, the light outlet of the second laser 66 is adjusted by the second adjustment frame 65 so that the laser emitted by the second laser 66 passes through the second substrate hole 611 and the second pair of plate holes 631. Since the third collimator 70 and the fourth collimator 80 are respectively installed at the head and tail ends of the bed plate 41, and the first laser 55 is located between the second laser 66 and the third collimator 70, the first laser 55 blocks the laser beam emitted by the second laser 66. Therefore, it is necessary to remove the first collimator, and then use the laser beam emitted by the aligned second laser 66 to observe whether the laser beam passes through the third substrate hole 711 of the third collimator 70 and the fourth substrate hole 811 of the fourth collimator 80 to determine whether the central axis of the prosthesis is aligned. If not aligned, the motion mechanism on the scanning bed can be further adjusted to adjust until the final alignment operation is completed, which will not be repeated here.

[0041] Those skilled in the art should note that, since the weight of the CT device is much greater than that of the PET device, for the convenience of adjustment, in this application, the first collimator is preferably installed on the CT device, and the second collimator is installed on the PET device after the CT device is installed and fixed, and the central axis of the scanning hole of the PET device and the CT device is finally aligned by adjusting the frame of the PET device. In fact, those skilled in the art may also first install the second collimator on the PET device, and then install the first collimator on the CT device and adjust the CT device to complete the alignment, which will not be repeated here.

[0042] The laser positioning device provided by the present invention has a simple structure, low cost, high alignment accuracy, convenient alignment operation, and is easy to disassemble. When the laser positioning device is applied to PET-CT, it can significantly improve the alignment of the central axis of the PET-CT scanning hole, and at the same time improve the alignment of the object to be measured installed on the scanning bed and the central axis of the PET-CT scanning hole, which is indirectly beneficial to improving the detection quality of PET-CT.

[0043] The above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. The above embodiment of the present invention can also be modified in various ways. That is, all simple, equivalent changes and modifications made according to the claims and the description of the present invention fall within the scope of protection of the claims of the present invention. The contents not described in detail in the present invention are all conventional technical contents.

Claims

1. A laser positioning device, characterized in that: The laser positioning device comprises: A first collimator, the first collimator comprising a first substrate, a first bottom plate, a first adjustment frame and a first laser, the first substrate and the first adjustment frame are respectively arranged at two opposite ends of the first bottom plate, first substrate mounting holes are arranged at both ends of the first substrate, a first substrate hole is arranged on the first substrate, a first laser is arranged on the first adjustment frame, and a light outlet of the first laser corresponds to the first substrate hole; a second collimator, wherein second substrate mounting holes are provided at both ends of the second collimator, a second substrate hole is provided on the second collimator, and the second substrate hole and the first substrate hole are located on the same straight line after installation, the second collimator comprises a second adjustment frame, a second pair of plates and a second laser, a second pair of plate holes are provided on the second pair of plates, the second laser is provided on the second adjustment frame, and a light outlet of the second laser corresponds to the second substrate hole; a third collimator, wherein a third substrate hole is disposed on a central axis of the third collimator; and a fourth collimator, wherein a fourth substrate hole is arranged on a central axis of the fourth collimator; The first collimator is installed on the CT device, the second collimator is installed on the PET device, and the third collimator and the fourth collimator are installed on the front and rear ends of the bed board respectively.

2. The laser positioning device according to claim 1, characterized in that: The first bottom plate is provided with a first bottom plate scribe line, the extension direction of the first bottom plate scribe line is perpendicular to the plane where the first substrate is located, and the extension direction of the first bottom plate scribe line is also parallel to the extension direction of the first substrate hole.

3. The laser positioning device according to claim 1, characterized in that: Two first side panels arranged parallel to each other are also provided on the first bottom plate, the first side panels are respectively connected to the first substrate and the first bottom plate, the planes where the first side panels are located are respectively perpendicular to the planes where the first substrate and the first bottom plate are located, and the first side panel is provided with a first side panel engraved line parallel to the extension direction of the first substrate hole.

4. The laser positioning device according to claim 3, characterized in that: The height of the first side plate scribe line is the same as the height of the center of the first substrate hole.

5. The laser positioning device according to claim 1, characterized in that: The second collimator further includes a second substrate, the second substrate mounting holes are arranged at two ends of the second substrate, and the second substrate hole is located at the center of the second substrate.

6. The laser positioning device according to claim 5, characterized in that: The second collimator further includes a second bottom plate, and the second adjustment frame and the second substrate are respectively arranged at two opposite ends of the second bottom plate.

7. The laser positioning device according to claim 6, characterized in that: The second bottom plate is provided with a second bottom plate scribe line, the extension direction of the second bottom plate scribe line is perpendicular to the plane where the second substrate is located, and the extension direction of the second bottom plate scribe line is also parallel to the extension direction of the second substrate hole.

8. The laser positioning device according to claim 6, characterized in that: Two second side panels arranged parallel to each other are also provided on the second bottom plate, the second side panels are respectively connected to the second substrate and the second bottom plate, the planes where the second side panels are located are respectively perpendicular to the planes where the second substrate and the second bottom plate are located, and the second side panel is provided with a second side panel engraved line parallel to the extension direction of the second substrate hole.

9. The laser positioning device according to claim 8, characterized in that: The height of the second side plate scribe line is the same as the height of the center of the second substrate hole.

10. The laser positioning device according to claim 8, characterized in that: An observation window is provided on the first substrate, the first bottom plate or the second substrate, the second bottom plate.

11. A PET-CT device, comprising a CT device and a PET device arranged side by side, characterized in that: The PET-CT device comprises the laser positioning device according to any one of claims 1 to 10, the first collimator is mounted on the CT device through the first substrate mounting hole, and the second collimator is mounted on the PET device through the second substrate mounting hole.

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