A radioactive source storage and positioning device for a positron emission tomography system

Abstract

The present application relates to the technical field of nuclear medicine, in particular to a radioactive source storage and positioning device for a positron emission imaging system, comprising a support body and a storage box body, the support body is flush with the front end of the storage box body, and a blocking front door is slidingly installed on a first sliding rail. The inner cavity of the storage box body is provided with a radioactive source body, the radioactive source body extends outward from the opening of the storage box body to a specified position, and the center axis of the positioning mark of the blocking front door coincides with the axis of the radioactive source body. The blocking front door seals the radioactive source for sealed storage; when the blocking front door is opened, the radioactive source can be placed in the specified position. The positioning mark is arranged on the blocking front door, when the blocking front door slides to the first position along the first sliding rail, the storage box body containing the radioactive source body is blocked, so that the operator does not need to directly contact the radioactive source body, and the radiation of the radioactive source when the operator calibrates the position of the radioactive source body is avoided.

Description

Technical Field

[0001] This invention relates to the field of nuclear medicine technology, and in particular to a device for storing and positioning radioactive sources for positron emission tomography (PET) imaging systems. Background Technology

[0002] In the field of medical imaging, positron emission tomography (PET) is playing an increasingly important role as a functional imaging device. PET is a non-invasive imaging technology that displays the function and metabolism of human organs. Its working principle involves injecting substances essential for biological metabolism, such as glucose, proteins, nucleic acids, and fatty acids, labeled with short-lived radioactive isotopes (such as 18F and 11C), into the human body. Utilizing the different metabolic states of different tissues—for example, in highly metabolic malignant tumor tissues where glucose metabolism is vigorous and accumulates in large quantities—these characteristics reflecting metabolic activities are reflected in the images, thereby achieving the goal of early diagnosis of diseases such as tumors.

[0003] Positron emission tomography (PET) systems are typically ring-shaped detection systems containing tens of thousands of detector elements. Due to the "drift" in the performance of electronic components caused by temperature and humidity variations, daily quality control and periodic parameter adjustments of the PET system are crucial to ensuring satisfactory image quality. Therefore, before using a PET system, a cylinder containing a uniform radiation source needs to be placed in a designated location. The PET scans the uniform radiation source, and observing the uniformity of the image afterward is the most direct method of quality control. If the image quality meets the requirements, patient scanning can begin directly. If the image quality does not meet the standards, the PET system parameters need to be adjusted to meet the patient's scanning quality requirements.

[0004] In other words, both routine quality control and periodic parameter adjustment processes require the radiation source to be moved from its storage location (source library) to the center of the equipment. This center location must be a designated location, which has certain requirements. Ideally, the designated location should coincide with the axis of the detector ring and cover the entire axial field of view. During this process, it is unavoidable that operators will be exposed to radiation, and they need to manually hang the radiation source. Although the number of times an operator is exposed to radiation is small, the cumulative radiation exposure over the year will be relatively high.

[0005] In particular, the process of adjusting parameters using a radiation source requires high precision in the position of the radiation source. Generally, the deviation of the radiation source relative to the detector ring in the X and Y directions should not exceed 2 mm. After the position is determined, the radiation source is installed on the bracket for fixing the radiation source. Therefore, during the parameter adjustment process, it may be necessary to adjust the position of the radiation source relative to the bracket multiple times to meet the requirements. Currently, each adjustment requires the operator to be directly exposed to radiation, which is time-consuming and laborious, and inevitably exposes the operator to radiation. Summary of the Invention

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a radiation source storage and positioning device for a positron emission tomography system, which solves the technical problem of operators being irradiated by radiation.

[0007] To achieve the above objectives, the main technical solutions adopted by the present invention include: This invention provides a radiation source storage and placement device for a positron emission tomography (PET) imaging system, including a support body and a storage box disposed on the support body. The front end of the support body and the storage box are flush to form an installation end face for laying a first slide rail. A sealing front door for sealing the storage box is slidably installed on the first slide rail. The inner cavity of the storage box is provided with a radioactive source body, which can extend outward from the opening of the storage box to a designated position. The sealing front door has a positioning mark, and the central axis of the positioning mark of the sealing front door coincides with the axis of the radioactive source body.

[0008] Optionally, right-angled grooves are provided on the left and right ends of the front door near the first slide rail. A front door slider is fixedly installed in the right-angled groove. The front door slider is slidably installed on the first slide rail. A mounting pin hole is provided on the front end face of the front door. A through-hole is provided on the front side face of the front door. When the front door is in the first position on the first slide rail, the pin passes through the pin hole and is locked to the mounting pin hole.

[0009] Optionally, the storage box includes a left side wall, a top wall, a right side wall, and a rear wall; The left side wall, top wall and right side wall are integrally formed to form an inverted "U" shape, and the inverted "U" shape is fastened to the support platform to form a square tube structure, and the rear wall is set at one end of the square tube structure.

[0010] Optionally, the support platform, the left side wall, the top wall, the right side wall, and the rear wall are all in a nested plate structure, with the outer layer of the support platform being made of steel plate and the inner layer being made of lead.

[0011] Optionally, a second slide rail is symmetrically and fixedly installed on the top end face of the support platform. The longitudinal direction of the second slide rail is parallel to the axis of the radioactive source body. A slider is slidably installed on each of the second slide rails, and the radioactive source body is fixedly installed between two sliders.

[0012] Optionally, the main body of the radioactive source includes a barrel source mounting frame, a barrel source, and a barrel source push rod; The barrel source mounting bracket is arranged parallel to the rear wall, and the side of the barrel source mounting bracket away from the rear wall is detachably connected to one end face of the barrel source through a U-shaped hanging bracket opening; One end of the barrel source push rod is fixedly installed on the barrel source mounting bracket, and the other end extends through the rear wall to the outside.

[0013] Optionally, the barrel source push rod includes a fixing part that is fixedly installed with the barrel source mounting bracket and a folding part that is hinged to the fixing part, wherein the hinge point between the fixing part and the folding part is located outside the storage box.

[0014] Optionally, the first slide rail is a cylindrical slide rail.

[0015] Optionally, when the front door is in the first position, the central axis of the positioning mark of the front door coincides with the axis of the radioactive source body, so as to align the radioactive source body in the inner cavity of the storage box.

[0016] Optionally, a handle is provided on the upper surface.

[0017] The beneficial effects of this invention are as follows: The radioactive source storage and positioning device for a positron emission tomography (PET) imaging system primarily utilizes a front door that can be selectively opened or closed to seal and store the radioactive source in a container or place it in a designated location for operation. Furthermore, a positioning marker is provided on the front door. When the front door slides along a first slide rail to a first position, it seals the storage container containing the radioactive source. At this point, the central axis of the radioactive source coincides with the center line of the positioning marker, effectively aligning the center of the radioactive source with the front door. This eliminates the need for direct manual contact with the radioactive source, preventing operators from being exposed to radiation during the calibration of the source's position. In other words, this radioactive source storage device serves as part of the calibration process when the radioactive source is being calibrated, and when not in use, it acts as a storage and shielding device for the radioactive source. One device serves two purposes, saving resources. Moreover, the device is placed on a support structure and is easily movable.

[0018] During the positioning process of the radioactive source, the main body of the radioactive source is kept inside the storage box throughout the entire positioning process. After positioning is completed, the main body of the radioactive source is pushed to the designated usage position. This process greatly reduces the radiation exposure of operators to the radioactive source. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the main structure of the radiation source storage and positioning device for a positron emission tomography system of the present invention (second position of the front door blocked). Figure 2 This is a front-view perspective view of the radiation source storage and positioning device for a positron emission tomography system of the present invention (first position of the front door blocked). Figure 3 This is a front view schematic diagram of the radiation source storage and positioning device for a positron emission tomography system of the present invention (first position of the front door blocked). Figure 4 for Figure 3 A schematic diagram of the left-side cross-sectional structure; Figure 5 This is a top view of the sealing structure of the front door of the radiation source storage and positioning device for a positron emission tomography system according to the present invention.

[0020] Explanation of reference numerals in the attached figures 1. Support body; 11. Rectangular frame; 12. Support legs; 13. Support platform; 14. Casters; 141. Directional casters; 142. Universal casters; 15. Adjustable support block; 101. Opening; 2. Storage box; 21. Left side wall; 22. Top wall; 221. Mounting pin hole; 23. Right side wall; 24. Rear wall; 3. First slide rail; 4. Front door sealing; 41. Positioning mark; 401. Front side; 4011. Pin hole; 4 02. Rear side; 4021. Right-angled groove; 403. Left side; 404. Right side; 405. Top end face; 406. Bottom end face; 407. Front door slider; 408. Cylindrical slide groove; 409. Handle; 5. Radiation source body; 51. Barrel source mounting bracket; 511. U-shaped hanging bracket opening; 52. Barrel source; 53. Barrel source push rod; 531. Fixing part; 532. Folding part; 6. Second slide rail; 7. Slider; 8. Level. Detailed Implementation

[0021] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Example 1: See Figures 1-5As shown in the figure, an embodiment of the present invention proposes a radiation source storage and positioning device for a positron emission tomography (PET) imaging system, comprising a support body 1 and a storage box 2 disposed on the support body 1. The front end of the storage box 2 has an opening 101, and the support body 1 is flush with the front end of the storage box 2 to form an installation end face for laying a first slide rail 3. A sealing front door 4 for sealing the opening 101 is slidably mounted on the first slide rail 3. A radiation source body 5 is disposed in the inner cavity of the storage box 2, and the radiation source body 5 can extend outward from the opening 101 relative to the storage box 2 to a designated position. The sealing front door 4 has a positioning mark 41, and the central axis of the positioning mark 41 of the sealing front door 4 coincides with the axis of the radiation source body 5.

[0023] In this embodiment, a radioactive source storage and positioning device for a positron emission tomography (PET) system primarily utilizes a sealing door 4 to selectively open or close, allowing for sealed storage of the radioactive source body 52 in a container or placement in a designated location. A positioning marker 41 is provided on the sealing door 4. When the sealing door 4 slides along the first slide rail 3 to the first position, it seals the storage container 2 containing the radioactive source body 5. At this point, the central axis of the radioactive source body 5 coincides with the center line of the positioning marker, effectively placing the center of the radioactive source body 5 onto the sealing door 4. This eliminates the need for direct manual contact with the radioactive source body 5, preventing operators from being exposed to radiation during the calibration of the radioactive source body 5. In other words, this radioactive source storage device serves as part of the calibration process when the radioactive source body 5 is being calibrated, and when not in use, it acts as a storage and shielding device for the radioactive source body 5. One device serves two purposes, saving resources. Furthermore, the device is placed on a support body and is easily movable.

[0024] During the positioning process of the radioactive source, the main body of the radioactive source is kept inside the storage box throughout the entire positioning process. After positioning is completed, the main body of the radioactive source is pushed to the designated usage position. This process greatly reduces the radiation exposure of operators to the radioactive source.

[0025] In this embodiment, a movable device for a radioactive source is provided, which has the function of storing and positioning a uniform barrel source. Normally, it can be used to store a uniform radioactive source, so that the radioactive source is stored in a sealed lead protective device, which can also meet the storage requirements of the radioactive source in the source library.

[0026] When using the equipment, the storage box 2 containing the radiation source body 5 can be moved directly from the radiation source library to the corresponding position of the PET or PET / CT system to fix it in place for position calibration. After the position calibration is completed, the barrel source 52 in the radiation source body 5 remains within the protective shell of the storage box 2 throughout the entire process. Then, the operator opens the sealing front door 4 of the device (loosens the pin in the shaft hole, and then the sealing front door 4 slides down along the first slide rail 5 due to gravity, opening the opening 101), and manually pushes the barrel source push rod 53 to make the barrel source mounting bracket 51 of the radiation source body 5 slide forward along the second slide rail 6, thereby pushing the barrel source 52 of the radiation source body 5 out of the storage box 2 to the required working position, greatly reducing the time the operator is exposed to radiation.

[0027] Furthermore, the support body 1 includes a rectangular frame 11, four parallel support legs 12 located at the top four corners of the rectangular frame 11, and a support platform 13 located on top of the support legs 12. Each of the four bottom corners of the rectangular frame 11 is equipped with a caster wheel 14, and four height-adjustable support blocks 15 are arranged around the outer periphery of the rectangle formed by the four casters 14, passing through the rectangular frame 11. The support platform 13 serves as the base for storing the box 2. Both the rectangular frame 11 and the support legs 12 are welded from rectangular steel pipes.

[0028] Here, at the lower part of the rectangular frame 11 of the support body 1, there are four moving wheels 14, which consist of two omnidirectional wheels 142 and two directional wheels 141. The moving wheels 14 are mainly designed for convenient movement between the source storage and the equipment. Near each moving wheel 14, there are four adjustable support blocks 15 with adjustable height. The adjustable support blocks 15 are for the following reasons: First, to adapt to the ground conditions where the overall device is placed, they can be adjusted to achieve a level overall device (a level 8 is placed above the storage box 2); Second, when the radioactive source is working, the adjustable supports contact the ground instead of the moving wheels 14, ensuring the reliable positioning of the entire device and preventing it from moving during use, thus ensuring the precise position of the radioactive source.

[0029] Furthermore, the storage box 2 includes a left side wall 21, a top wall 22, a right side wall 23, and a rear wall 24. The left side wall 21, the top wall 22, and the right side wall 23 are integrally formed to form an inverted "U" shape, and the inverted "U" shape is fastened to the support platform 13 to form a square tube structure. The rear wall 24 is located at one end of the square tube structure.

[0030] Furthermore, the support platform 13, left side wall 21, top wall 22, right side wall 23 and rear wall 24 are all nested plate structures, with the outer layer of the support platform 13 made of steel plate and the inner layer made of lead.

[0031] In this embodiment, a support platform 13 is provided at the top of the support legs 12 of the support body 1. The support platform 13 has an outer steel plate and an inner lead structure. The inner lead can be a thin layer of lead laminated together or cast lead. The steel plate at the top of the support platform 13 is 8mm thick and its surface is precisely machined to ensure a flatness of 0.5mm. The support platform 13 is very important. First, it supports the radiation source and serves as the installation base for the moving device. Second, its lead structure also provides radiation protection. At the front end of the support body 1, a first slide rail 5 is arranged for the vertical movement of the front door 4. The first slide rail 5 extends to the left and right side walls of the front face of the storage box, facilitating the opening and closing of the front door 4.

[0032] In addition, the main function of the storage box 2 is to contain the solid barrel source 52. Its interior forms a box. For easy installation, the base of the storage box 2, the support platform 13, the front door 4, and the rear wall 24 are installed separately. The remaining left side wall 21, right side wall 23, and top wall 22 are a whole, with an outer steel plate and inner lead structure. The whole is fixed to the support platform 13 with screws. In addition, in order to ensure the opening and closing of the front door 4, cylindrical first slide rails 5 are installed on the front surfaces of the left side wall 21, right side wall 23, and support legs 12 of the storage box 2. The first slide rails 5 facilitate the closing of the front door 4 under normal conditions. The front door 4 is located at the front of the storage box 2. The front side 401 of the front door 4 and the front surface of the top wall 22 have corresponding pin holes 4011 and mounting pin holes 221, with a diameter of 10mm. The position of the front door 4 is secured by pins. When in use, pull out the pin, lower the sealing front door 4, and the solid barrel source 52 can be pushed to the working position.

[0033] Furthermore, a second slide rail 6 is symmetrically and fixedly installed on the top end face of the support platform 13. The longitudinal direction of the second slide rail 6 is parallel to the axis of the radioactive source body 5. A slider 7 is slidably installed on each second slide rail 6, and the radioactive source body 5 is fixedly installed between two sliders 7.

[0034] Furthermore, the radioactive source body 5 includes a barrel source mounting bracket 51, a barrel source 52, and a barrel source push rod 53. The barrel source mounting bracket 51 is arranged parallel to the rear wall 24, and the side of the barrel source mounting bracket 51 away from the rear wall 24 is detachably connected to one end face of the barrel source 52 through a U-shaped hanging bracket opening 511. One end of the barrel source push rod 53 is fixedly mounted on the barrel source mounting bracket 51, and the other end extends through the rear wall 24 to the outside.

[0035] Furthermore, the barrel source push rod 53 includes a fixing part 531 that is fixedly installed with the barrel source mounting bracket 51 and a folding part 532 that is hinged to the fixing part 531. The hinge point between the fixing part 531 and the folding part 532 is located outside the storage box 2.

[0036] Here, the support and movement mechanism of the solid source 52 includes a second slide rail 6. Two second slide rails 6 are precisely fixed to the support platform 13, with a spacing approximately equal to the diameter of the source 52 (200mm). A slider 7 is fixed to each second slide rail 6. The source mounting bracket 51 is fixed to the slider 7 of the source with screws. The source mounting bracket 51 has a U-shaped hanging opening 511. Because the source 52 has a cylindrical structure and a plastic outer wall, it is a universal hanging structure. When the source mounting bracket 51 is installed, the connection between the source mounting bracket 51 and the slider 7 creates an angle of approximately 1 degree, which allows the source 52 to operate at a basically horizontal position after being hung. The function of the source push rod 53 is to push the device to the designated position after the sealing door 7 is opened after the device is in place. The barrel source push rod 53 consists of two parts: the fixing part 531 is connected to the barrel source mounting bracket 51 by screws, and the fixing part 531 after connection is fitted with the opening on the rear wall 24 of the storage box 2 with clearance. The folding part 532 of the barrel source push rod 53 is connected to the fixing part 531 by a pin to ensure that it can be folded. The folding design is to save space in the device.

[0037] Furthermore, the first slide rail 3 is a cylindrical slide rail.

[0038] Furthermore, the front door 4 is equipped with a front side 401 and a rear side 402, a left side 403 and a right side 404, and an upper end 405 and a lower end 406, which are arranged opposite to each other. Right-angled grooves 4021 are formed inwards at both ends of the rear side 402. A front door slider 407 is fixedly installed within the right-angled groove 4021. An opening is formed on the side of the front door slider 407 away from the front side 401, and a cylindrical groove 408 communicating with the opening is formed within the front door slider 407, facilitating the installation and removal of the front door 4. A first slide rail 3 is provided on each of the left and right sides, and each first slide rail 3 is equipped with two front door sliders 407, ensuring the stability of the front door 4. Additionally, the side of the front door slider 407 closest to the front side 401 is a connecting plane, and this connecting plane is connected to the right-angled groove 4021 via connecting bolts. The front end face of the top wall 22 is provided with a mounting pin hole 221, and the front side 401 of the sealing front door 4 is provided with a through pin hole 4011. When the sealing front door 4 is in the first position on the first slide rail 3, the pin passes through the pin hole 4011 and is locked onto the mounting pin hole 221.

[0039] It should be noted that the design of the movable structure for blocking the front door 4 is a key and challenging aspect. Firstly, the integrity of the shielding structure must be considered. Secondly, because the positioning mark 41 is on the front door 4, its closing position needs to be precise. Taking all these factors into account, see [reference needed]. Figure 5As shown, the first slide rail 5 of the front door 4 is arranged in the right-angled grooves 4021 of the concave structure on both sides of the front door 4, which ensures the integrity of the shielding. In addition, the first slide rail 5 and the front door slider 407 adopt cylindrical slide rails with bottom support and open front door slider 407, which ensures the convenience and rationality of assembly. Then, the accuracy of the laser marking after the front door 4 is reset is ensured by pin control with precise positioning on the top of the front door 4 and the storage box 2. In order to ensure the convenience of opening and closing the door, a flat handle 409 is designed on the top surface 405 of the front door 4.

[0040] Normally, the entire device, used as a radioactive source storage unit, is placed in a dedicated source library. When the equipment (PET or PET / CT) needs to be used, it is moved from the source library to the equipment room and placed behind the equipment. The solid-state source 52 is positioned with the axis center of the PET or PET / CT to be placed and the field of view center of the detector ring. The radioactive source body 5 is pushed to the rear of the equipment, ensuring that the front moving wheels 14 are as close as possible to the rear cover and at equal distances. Then, the laser light on the equipment needs to be turned on. The laser light on the equipment usually has a crosshair laser light to mark the center position. Align the laser light with the positioning mark 41 on the front door 4 of the device. Adjust the four adjustable support blocks 15 to align the positioning mark 41 with the crosshair laser mark on the equipment. At the same time, the bubble level 8 on the top should also indicate a horizontal position. If not, first consider adjusting the two adjustable support blocks 15 on the rear side to make their positioning mark 41 coincide with the laser mark on the equipment, and at the same time, the bubble level 8 on the top should be in a horizontal state. After adjustment, remove the locking pin of the sealing front door 4 and gently lower the sealing front door 4; finally, straighten the source push rod 53 and place the solid source in the center of the PET or PETCT field of view. The operation is now complete. Related data acquisition and calibration can then be performed at the device's control terminal.

[0041] It should also be noted that the change in the position of the barrel source 52 actually changes the center of gravity of the entire device. The stability after the change in the center of gravity needs to be considered. In fact, the barrel source 52, with a diameter of 200mm and a length of 300mm, weighs about 10kg. The weight of the lead protection of the entire storage box 2 and the main body of the support 1 is more than 100kg. Therefore, the extension and retraction of the barrel source 52 and the change in the position of the barrel source 52 itself have little impact on the change in the center of gravity of the entire device and will not affect the stability of the device.

[0042] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0043] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0044] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0045] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A device for storing and positioning radioactive sources for a positron emission tomography (PET) imaging system, characterized in that: It includes a support body (1) and a storage box (2) disposed on the support body (1). The front end of the support body (1) and the storage box (2) are flush to form an installation end face for laying a first slide rail (3). A sealing front door (4) for sealing the storage box (2) is slidably installed on the first slide rail (3). The inner cavity of the storage box (2) is provided with a radioactive source body (5), which can extend outward from the opening (101) to a designated position relative to the storage box (2), and the sealing front door (4) has a positioning mark (41).

2. The radiation source storage and positioning device for a positron emission tomography (PET) imaging system as claimed in claim 1, characterized in that: The sealing front door (4) has right-angle grooves (4021) on both sides near the first slide rail (3). A front door slider (407) is fixedly installed in the right-angle groove (4021). The front door slider (407) is slidably installed on the first slide rail (3). The front end face of the sealing front door (4) has a mounting pin hole (221). The front side (401) of the sealing front door (4) has a through pin hole (4011). When the sealing front door (4) is in the first position on the first slide rail (3), the pin passes through the pin hole (4011) and is locked on the mounting pin hole (221).

3. The radiation source storage and positioning device for a positron emission tomography (PET) imaging system as claimed in claim 2, characterized in that: The storage box (2) includes a left side wall (21), a top wall (22), a right side wall (23), and a rear wall (24). The left side wall (21), top wall (22) and right side wall (23) are integrally formed to form an inverted "U" shape, and the inverted "U" shape is fastened to the support platform (13) of the support body (1) to form a square tube structure. The rear wall (24) is set at one end of the square tube structure.

4. The radiation source storage and positioning device for a positron emission tomography (PET) imaging system as claimed in claim 3, characterized in that: The support platform (13), the left side wall (21), the top wall (22), the right side wall (23) and the rear wall (24) are all in a nested plate structure. The outer layer of the support platform (13) is made of steel plate and the inner layer is made of lead.

5. The radiation source storage and positioning device for a positron emission tomography (PET) imaging system as claimed in claim 4, characterized in that: The top end face of the support platform (13) is symmetrically fixedly installed with a second slide rail (6). The longitudinal direction of the second slide rail (6) is parallel to the axis of the radioactive source body (5). A slider (7) is slidably installed on each of the second slide rails (6), and the radioactive source body (5) is fixedly installed between two sliders (7).

6. The radiation source storage and positioning device for a positron emission tomography (PET) imaging system as claimed in claim 5, characterized in that: The radioactive source body (5) includes a barrel source mounting bracket (51), a barrel source (52), and a barrel source push rod (53). The barrel source mounting bracket (51) is arranged parallel to the rear wall (24), and the side of the barrel source mounting bracket (51) away from the rear wall (24) is detachably connected to one end face of the barrel source (52) through a U-shaped hanging bracket opening (511); One end of the barrel source push rod (53) is fixedly installed on the barrel source mounting bracket (51), and the other end extends through the rear wall (24) to the outside.

7. The radiation source storage and positioning device for a positron emission tomography (PET) imaging system as claimed in claim 6, characterized in that: The barrel source push rod (53) includes a fixing part (531) fixedly installed with the barrel source mounting bracket (51) and a folding part (532) hinged to the fixing part (531). The hinge point between the fixing part (531) and the folding part (532) is located outside the storage box (2).

8. The radiation source storage and positioning device for a positron emission tomography (PET) imaging system as claimed in claim 7, characterized in that: The first slide rail (3) is a cylindrical slide rail.

9. The radiation source storage and positioning device for a positron emission tomography (PET) imaging system as claimed in claim 2, characterized in that: When the sealing front door (4) is in the first position, the central axis of the positioning mark (41) of the sealing front door (4) coincides with the axis of the radioactive source body (5) so as to align the radioactive source body (5) in the inner cavity of the storage box (2).

10. The radiation source storage and positioning device for a positron emission tomography (PET) imaging system as claimed in claim 9, characterized in that: A handle (409) is provided on the upper end face (405).

Images