Temperature self-regulating PET detector device

Abstract

The invention provides a temperature self-regulation PET detector device which comprises a submodule assembly, the submodule assembly comprises a base, a support and a submodule carrier plate fixed to the base through the support, and the submodule carrier plate is connected with a bimetallic strip structure; the cold plate assembly is in contact with the sub-module carrier plate through the bimetallic strip structure, when the temperature of the sub-module carrier plate rises, the contact area of the bimetallic strip structure and the cold plate assembly is increased, and when the temperature of the sub-module carrier plate drops, the contact area of the bimetallic strip structure and the cold plate assembly is reduced. According to the invention, the temperature between the PET detectors and the temperature between the sub-modules in the detectors can be stabilized in a certain temperature range, and the temperature difference is reduced, so that the image quality of the PET detectors is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the medical field, and in particular to a PET detector device with self-regulated temperature. BACKGROUND

[0002] A positron emission tomography (PET) system requires tens of PET detectors to be arranged in a ring array within an effective field of view, and each detector is composed of multiple sub-modules. According to the use requirements, the PET detector needs to be maintained within a certain temperature range, and the temperature uniformity between the detectors and the sub-modules needs to be as consistent as possible.

[0003] The existing thermal management schemes mainly include two routes of air cooling and liquid cooling. The air cooling system drives air to flow over the heat dissipation fins through an axial flow or centrifugal fan, takes the average temperature of the module as the feedback quantity, adjusts the fan speed to realize overall temperature control; the liquid cooling system uses liquid medium, exchanges heat with the detector sub-module back plate through the cold plate or microchannel, also takes the single-point temperature as the feedback quantity, adjusts the flow rate through the frequency conversion pump. The above schemes take the whole ring or board as the control object, and cannot independently set the temperature for a single sub-module, resulting in temperature difference between the edge and center modules under the action of natural convection and stacking thermal resistance. In addition, the speed regulation of the fan or pump belongs to the typical "measurement-comparison-execution" feedback control, and the thermal-electric-mechanical transmission mode is easy to lag, which is difficult to quickly compensate for thermal disturbance when the scanning protocol is switched, the count rate is suddenly changed or the room temperature fluctuates, resulting in image quality degradation.

[0004] With the development of whole-body dynamic PET and ultra-long axial coverage technology, the total power consumption of the detector increases linearly, and the number of sub-modules increases exponentially. The traditional centralized heat dissipation architecture is difficult to guarantee in terms of heat flux density, temperature difference control and response speed, and a new technology of parallel and independent sub-module level precise thermal management is urgently needed. SUMMARY

[0005] In order to overcome the above technical defects, the purpose of the present application is to provide a PET detector device with self-regulated temperature, which automatically regulates the temperature of the PET detector through a bimetallic strip structure and an adaptive liquid cooling structure, and realizes the temperature uniformity between the sub-modules and between the detectors.

[0006] The present application discloses a PET detector device with self-regulated temperature, comprising: a sub-module assembly, the sub-module assembly comprising a base, a support and a sub-module carrier plate fixed to the base through the support, and a bimetallic strip structure connected to the sub-module carrier plate; and a cold plate assembly in contact with the bimetallic structure and the sub-module carrier plate, the contact area between the bimetallic structure and the cold plate assembly increases when the temperature of the sub-module carrier plate rises, and the contact area between the bimetallic structure and the cold plate assembly decreases when the temperature of the sub-module carrier plate falls.

[0007] Preferably, the bimetallic structure comprises a base plate and a plurality of spring plates connected to the base plate, the spring plates deform to a convex state when the temperature of the sub-module carrier plate rises, and the contact area between the end of the spring plates not connected to the base plate and the cold plate assembly increases, the spring plates retract to a flat state when the temperature of the sub-module carrier plate falls, and the contact area between the end of the spring plates not connected to the base plate and the cold plate assembly decreases.

[0008] Preferably, the cold plate assembly is internally provided with a liquid cooling flow channel and a self-adjusting valve core structure connected to the liquid cooling flow channel, the self-adjusting valve core structure controls the flow rate of the liquid cooling flow channel, the opening of the self-adjusting valve core structure increases when the temperature of the liquid cooling medium in the liquid cooling flow channel rises, and the flow rate of the liquid cooling flow channel increases, and the opening of the self-adjusting valve core structure decreases when the temperature of the liquid cooling medium in the liquid cooling flow channel falls, and the flow rate of the liquid cooling flow channel decreases.

[0009] Preferably, the cold plate assembly comprises a cold plate main body, the liquid cooling flow channel is internally installed in the cold plate main body, and the cold plate main body is further internally provided with a valve core cavity accommodating the self-adjusting valve core structure, and the self-adjusting valve core structure is connected to the flow channel main outlet of the liquid cooling flow channel.

[0010] Preferably, the self-adjusting valve core structure comprises a regulating knob, a first spring, a valve core body and a second spring in sequence, the regulating knob is arranged at the opening of the valve core cavity, the first spring is a shape memory alloy spring, and the second spring is a common spring, the initial pre-tightening force of the first spring and the second spring is adjusted by the regulating knob to determine the initial position of the valve core body, the first spring deforms according to the heat transferred by the liquid cooling flow channel, the first spring elongates when the first spring is heated and rises, the first spring pushes the valve core body to move towards the second spring to increase the opening of the liquid cooling flow channel, and the second spring pushes the valve core body to move towards the first spring when the first spring is heated and falls.

[0011] Preferably, the cold plate assembly further comprises a cover plate, a sealing structure and a quick release joint, the cover plate is detachably connected to the cold plate main body, the sealing structure is arranged between the cover plate and the cold plate main body and covers the liquid cooling flow channel, and the quick release joint is arranged at one end of the cold plate assembly and connected to the liquid cooling flow channel.

[0012] Preferably, the sub-module assembly further comprises an adhesive layer connected to the sub-module carrier plate and the bimetallic structure, respectively. Preferably, one sub-module assembly comprises a base, a plurality of supports, and a pair of sub-module carrier plates, the two sub-module carrier plates are connected with the base through the plurality of supports, the two sub-module carrier plates are placed face to face according to the bimetallic spring structure, the cold plate assembly is arranged between the pair of sub-module carrier plates, and a set of heat-conducting silica gel is further connected outside the cold plate assembly, and the heat-conducting silica gel is arranged between the cold plate assembly and the sub-module carrier plate.

[0013] Preferably, the device further comprises a front end plate and a detector shell, a plurality of sub-module assemblies are arranged in the detector shell, and the front end plate is connected to the cold plate assembly.

[0014] Preferably, the cold plate assembly further comprises a fastening screw, screw holes are arranged on the cover plate and the cold plate body, and the fastening screw is matched with the screw holes to fixedly connect the cover plate and the cold plate body.

[0015] After the above technical scheme is adopted, compared with the prior art, the following beneficial effects are obtained: 1. The detector sub-module disclosed by the application can adjust the heat dissipation contact area according to the temperature, that is, the contact area of the bimetallic spring structure and the cold plate assembly is adaptively adjusted to realize self temperature regulation, thereby reducing the temperature difference between the detector sub-modules, and independent and accurate temperature control of each sub-module can be realized. 2. The whole detector disclosed by the application can realize flow regulation according to the temperature of the liquid cooling medium to reduce the temperature difference between the detectors, effectively avoid the problems of response lag and limited regulation accuracy caused by traditional feedback control, and thus the purpose of rapid and active temperature control is achieved. 3. The application realizes self heat dissipation of the detector sub-module by adaptively contacting the cold plate assembly through the bimetallic spring structure, and realizes temperature control of the whole detector by self regulation of the flow of the liquid cooling medium of the cold plate assembly, and finally realizes that the multiple PET detectors arranged in a ring array have consistent temperatures, including the temperature between each PET detector sub-module and the temperature between the PET detectors. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 FIG. 1 is a structural schematic diagram of a PET detector device with self-regulating temperature disclosed by an embodiment of the application; Figure 2 FIG. 2 is a structural schematic diagram of a sub-module assembly disclosed by an embodiment of the application; Figure 3 FIG. 3 is a split structure diagram of the sub-module assembly disclosed by an embodiment of the application; Figure 4 FIG. 4 is a front view of a bimetallic spring structure in a spring protruding state disclosed by an embodiment of the application; Figure 5A side view of the bimetallic structure in the raised state of the spring sheet according to an embodiment of the present application is disclosed. Figure 6 A front view of the bimetallic structure in the flat state of the spring sheet according to an embodiment of the present application is disclosed. Figure 7 A side view of the bimetallic structure in the flat state of the spring sheet according to an embodiment of the present application is disclosed. Figure 8 An exploded view of the cold plate assembly according to an embodiment of the present application is disclosed. Figure 9 A planar cross-sectional view of the cold plate assembly according to an embodiment of the present application is disclosed. Figure 10 A state transition diagram of the self-adjusting valve core structure according to an embodiment of the present application is disclosed. Figure 11 A general structure diagram of the PET detector device according to a preferred embodiment of the present application is disclosed. Figure 12 A planar structure diagram of the PET detector device according to a preferred embodiment of the present application is disclosed. Figure 13 A structure diagram of the PET detector device according to another preferred embodiment of the present application is disclosed. Figure 14 A structure diagram of the detector housing according to a preferred embodiment of the present application is disclosed.

[0017] The reference signs: sub-module carrier plate-1; bimetallic structure-11; bottom plate-111; spring sheet-112; cold plate assembly-2; liquid cooling channel-21; adjusting knob-22; first spring-23; valve core body-24; second spring-25; cover plate-26; sealing structure-27; quick release connector-28; fastening screw-29; adhesive layer-3; front end plate-4; heat-conducting silicone-5; detector housing-6; base-7. DETAILED DESCRIPTION

[0018] The advantages of the present application are further described below in conjunction with the accompanying drawings and specific embodiments.

[0019] The exemplary embodiments will be described in detail herein below with reference to the accompanying drawings. In the following description, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments are not meant to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0020] The terminology used in the disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in the description of the disclosure and the appended claims, the singular forms "a temperature self-regulating PET detector device", "the" and "the" are also intended to include the plural forms, unless the context clearly indicates otherwise. It will also be understood that the term "and / or" as used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0021] It should be understood that, although the terms first, second, third, etc. can be employed in this disclosure to describe various information, these information should not be limited to these terms. These terms are only used to distinguish one type of information from another type of information. For example, without departing from the scope of the disclosure, first information can also be referred to as second information, and similarly, second information can also be referred to as first information. Depending on the context, the word "if" as used herein can be interpreted as "when" or "upon determination" or "in response to determining".

[0022] In the description of the present application, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0023] In the description of the present application, unless otherwise specified and limited, it should be noted that the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be mechanical connection or electrical connection, it can be the communication between two elements, it can be direct connection or indirect connection through intermediate medium, and the specific meaning of the above terms can be understood by those skilled in the art according to the specific circumstances.

[0024] In the subsequent description, the suffix such as "module", "component" or "unit" used to represent elements is only for the convenience of the description of the present application, and has no specific meaning in itself. Therefore, "module" and "component" can be used interchangeably.

[0025] As Figures 1-3 To achieve the above-mentioned purpose, the temperature self-regulating PET detector device disclosed by the present application comprises: A sub-module assembly, which comprises a base 7, a support and a sub-module carrier plate 1 fixed with the base 7 through the support, and a bimetallic strip structure 11 connected to the sub-module carrier plate 1; and a cold plate assembly 2, which is in contact with the bimetallic strip structure 11, when the temperature of the sub-module carrier plate 1 increases, the contact area between the bimetallic strip structure 11 and the cold plate assembly 2 increases, when the temperature of the sub-module carrier plate decreases, the contact area between the bimetallic strip structure 11 and the cold plate assembly 2 decreases.

[0026] Specifically, the sub-module carrier plate 1 is used for detecting gamma rays and photoelectric conversion, and has a heating element, which is the main heat source of the sub-module. According to the present application, a special bimetallic strip is designed on each sub-module of the PET detector, which deforms with temperature change; the heat of the sub-module is conducted to the cold plate assembly 2 through the bimetallic strip, when the temperature of the sub-module is high, the contact area between the bimetallic strip and the cold plate increases, when the temperature of the sub-module is low, the contact area between the bimetallic strip and the cold plate decreases, so that the sub-module is stabilized at a certain temperature, and the temperature difference between the sub-modules is reduced. Through this thermal-mechanical transmission mode, the response is faster, and the temperature of the internal sub-modules of the PET detector and the temperature difference between the sub-modules can be stabilized in a certain temperature range, so as to improve the image quality.

[0027] Preferably, as shown in Figures 4-7 the bimetallic strip structure 11 includes a bottom plate 111 and a plurality of spring sheets 112 connected to the bottom plate 111, when the temperature of the sub-module carrier plate 1 increases, the spring sheet 112 deforms to a convex state, the end of the spring sheet 112 not connected to the bottom plate 111 increases the contact area with the cold plate assembly 2, when the temperature of the sub-module carrier plate 1 decreases, the spring sheet 112 retracts to a flat state, the end of the spring sheet 112 not connected to the bottom plate 111 reduces the contact area with the cold plate assembly 2. Specifically, a large number of spring sheets 112 that can deform with temperature change are arranged on the bimetallic strip structure 11, as shown in Figures 4-5 when the temperature increases, the spring sheet 112 can deform and protrude, increase the contact area with the heat dissipation cold plate and accelerate heat dissipation, as shown in Figures 6-7 when the temperature is low, the spring sheet 112 retracts to a flat state, reduces the contact area with the cold plate assembly 2 and slows down heat dissipation; and after the bimetallic strip structure 11 is connected to the sub-module carrier plate 1, the spring sheet 112 is in a gradual state around the heating element, that is, the temperature at the center of the heating element is high, the spring sheet 112 deforms greatly and fully contacts the heat dissipation cold plate, gradually away from the heating element, the temperature decreases, the spring sheet 112 deforms gradually and the contact area with the cold plate assembly 2 gradually decreases Preferably, as shown in Figures 8-9As shown, the cold plate assembly 2 is internally provided with a liquid cooling flow channel 21, and a self-regulating valve core structure connected with the liquid cooling flow channel 21, which controls the flow rate of the liquid cooling flow channel 21. When the temperature of the liquid cooling medium in the liquid cooling flow channel rises, the opening of the self-regulating valve core structure becomes larger, the flow rate of the liquid cooling flow channel increases, and when the temperature of the liquid cooling medium in the liquid cooling flow channel decreases, the opening of the self-regulating valve core structure becomes smaller, and the flow rate of the liquid cooling flow channel decreases. That is, when the temperature of the sub-module (multiple) carrier board inside the probe is relatively high, the temperature of the liquid cooling medium flowing through is increased, and then the opening size of the adjusting valve core is adjusted.

[0028] Further, as shown in the accompanying drawings, Figures 8-10 The cold plate assembly 2 includes a cold plate body, the liquid cooling flow channel 21 is installed inside the cold plate body, and the cold plate body is further provided with a valve core cavity accommodating the self-regulating valve core structure, and the self-regulating valve core structure is connected to the flow channel main outlet of the liquid cooling flow channel 21; the self-regulating valve core structure includes an adjusting knob 22, a first spring 23, a valve core body 24 and a second spring 25 which are in contact in sequence, the adjusting knob 22 is arranged at the opening of the valve core cavity, the first spring 23 is a shape memory alloy spring, and the second spring 25 is a common spring. The initial pre-tightening force of the first spring 23 and the second spring 25 is adjusted by the adjusting knob 22 to determine the initial position of the valve core body 24. The first spring 23 deforms according to the heat transferred by the liquid cooling flow channel 21. When the first spring 23 is heated and rises, the first spring 23 is elongated, the first spring 23 pushes the valve core body 24 to move towards the second spring 25, and the opening of the liquid cooling flow channel 21 is increased. When the first spring 23 is heated and reduced, the first spring 23 is shortened, and the second spring 25 pushes the valve core body 24 to move towards the first spring 23.

[0029] Specifically, the cold plate body is the main structure of the cold plate assembly 2, and the liquid cooling flow channel 21 and the related part mounting interface are installed thereon; the adjusting knob 22 is used to adjust the initial pre-tightening force of the first spring 23 and the second spring 25, so that they are in a balanced state, and can be used to adjust the initial position of the valve core body 24 at a specific temperature; the first spring 23 is preferably an SMA (shape memory alloy) spring, which has a shape memory effect. After being heated, the spring will immediately elongate to the original state, and after the temperature decreases, it will immediately shorten. That is, Figure 10 (a) for the state that the temperature of the liquid cooling medium in the liquid cooling flow channel is relatively low, when the temperature of the liquid cooling medium in the flow channel rises, the first spring 23 is heated and elongated, the elastic force increases, the elastic force of the first spring 23 is greater than that of the second spring 25, the valve core body 24 is pushed to move downward, the flow channel opening is increased, and Figure 10 (b) when the temperature of the liquid cooling medium in the flow channel decreases, the first spring 23 is cooled and shortened, the elastic force decreases, the elastic force of the first spring 23 is smaller than that of the second spring 25, the valve core body 24 is pushed to move upward, the flow channel opening is reduced, and returns toFigure 10 (a) state; the valve core body 24 is installed in the cold plate body and can move axially in it (up and down) Figure 10 The valve core body 24 is internally connected with the first spring 23, and the heat of the liquid cooling medium can be directly transmitted to the first spring 23; the second spring 25 is a common coil spring, which is used to balance the elastic force of the first spring 23 and can push the valve core body 24 to move when the elastic force of the first spring 23 is reduced.

[0030] Preferably, the cold plate assembly 2 further comprises a cover plate 26, a sealing structure 27 and a quick release connector 28, the cover plate 26 is detachably connected with the cold plate body, the sealing structure 27 is arranged between the cover plate 26 and the cold plate body and covers the liquid cooling flow channel 21, and the quick release connector 28 is arranged at one end of the cold plate assembly 2 and connected with the liquid cooling flow channel 21. The cold plate assembly 2 further comprises a fastening screw 29, screw holes are arranged on the cover plate 26 and the cold plate body, and the fastening screw 29 is matched with the screw holes to fixedly connect the cover plate 26 and the cold plate body.

[0031] Specifically, the cover plate 26 forms a liquid cooling flow channel together with the cold plate body, the sealing structure 27 is used for sealing between the cover plate 26 and the cold plate body to prevent leakage of the liquid cooling medium, and the sealing structure 27 is preferably a sealing strip, and the quick release connector 28 provides a quick release interface for the liquid cooling pipeline while maintaining the sealing property.

[0032] Preferably, the sub-module assembly further comprises an adhesive layer 3, which is connected with the sub-module carrier plate 1 and the bimetallic strip structure 11 respectively, and is used for fixing the bimetallic strip structure 11 to the sub-module carrier plate 1 (which can also be fixed by screws or other fixing methods) while ensuring good contact between the bimetallic strip structure 11 and the sub-module carrier plate 1.

[0033] Preferably, as shown in Figure 13 One sub-module assembly comprises a base 7, a plurality of supports, and a pair of sub-module carrier plates 1, the two sub-module carrier plates 1 are connected with the one base 7 through the plurality of supports, and the two sub-module carrier plates 1 are placed face to face according to the bimetallic strip structure 112, the cold plate assembly 2 is arranged between the pair of sub-module carrier plates 1, and a set of heat-conducting silica gel 5 is further connected outside the cold plate assembly 2, and the heat-conducting silica gel 5 is arranged between the cold plate assembly 2 and the sub-module carrier plate 1.

[0034] Preferably, as shown in Figures 11-14As shown, the device further comprises a front end plate 4 and a detector housing 6, the detector housing 6 is provided with a plurality of sub-module assemblies, the front end plate 4 is used for signal acquisition, amplification and other processing operations of the sub-module assembly, the front end plate 4 is connected to the cold plate assembly 2, and specifically connected to the upper part of the cold plate assembly 2. That is, the lower half of the cold plate assembly 2 can be in contact with the bimetallic structure, the upper half of the cold plate assembly 2 is attached to the front end plate 4, and the cold plate assembly 2 can be used for heat dissipation of the detector sub-module 1 and the front end plate 4 at the same time.

[0035] The PET detector device with temperature self-regulation disclosed by the embodiment of the application can stabilize the temperature of the PET detector and reduce the temperature difference between the sub-modules by designing a special bimetallic structure on each sub-module of the PET detector, conducting the heat of the sub-module carrier plate to the cold plate assembly through the bimetallic structure, increasing the contact area between the bimetallic structure and the cold plate assembly when the temperature of the sub-module carrier plate is high, reducing the contact area between the bimetallic structure and the cold plate assembly when the temperature of the sub-module carrier plate is low, and stabilizing the sub-module carrier plate at a certain temperature. At the same time, the cold plate assembly is designed with a liquid cooling flow channel, and a valve core that can self-regulate the flow is designed at the main outlet of the flow channel. When the temperature of the liquid at the outlet is too high, the opening of the valve core becomes larger, the liquid flow is increased, and the heat dissipation is accelerated. When the temperature of the liquid at the outlet is too low, the opening of the valve core is reduced, the liquid flow is reduced, and the heat dissipation is slowed down. Finally, the PET detector is stabilized at a certain temperature. Through this thermal-mechanical transmission mode, the response is faster, and the temperature of the PET detector and the sub-modules can be stabilized at a certain temperature range, the temperature difference is reduced, and the image quality is improved.

[0036] It should be noted that the embodiments of the application have better implementation, and do not limit the application in any form. Any skilled person in the art can change or modify the above disclosed technical content into equivalent effective embodiments, as long as the content of the technical scheme of the application is not deviated, and any modification or equivalent change and modification of the above embodiments according to the technical essence of the application are still within the scope of the technical scheme of the application.

Claims

1. A temperature-self-regulating PET detector device, characterized in that, The device includes: A submodule assembly, the submodule assembly including a base, a bracket and a submodule carrier plate fixed to the base via the bracket, the submodule carrier plate being connected to a bimetallic strip structure; And a cold plate assembly, wherein the cold plate assembly contacts the submodule carrier plate through the bimetallic strip structure. When the temperature of the submodule carrier plate increases, the contact area between the bimetallic strip structure and the cold plate assembly increases; when the temperature of the submodule carrier plate decreases, the contact area between the bimetallic strip structure and the cold plate assembly decreases.

2. The temperature-self-regulating PET detector device as described in claim 1, characterized in that, The bimetallic sheet structure includes a base plate and multiple spring sheets connected to the base plate. When the temperature of the submodule carrier plate rises, the spring sheets deform into a convex state, and the contact area between the end of the spring sheet not connected to the base plate and the cold plate assembly increases. When the temperature of the submodule carrier plate decreases, the spring sheets retract into a flat state, and the contact area between the end of the spring sheet not connected to the base plate and the cold plate assembly decreases.

3. The temperature-self-regulating PET detector device as described in claim 1, characterized in that, The cold plate assembly has a liquid cooling channel inside and a self-regulating valve core structure connected to the liquid cooling channel. The self-regulating valve core structure controls the flow rate of the liquid cooling channel. When the temperature of the liquid cooling medium in the liquid cooling channel increases, the opening of the self-regulating valve core structure increases, and the flow rate of the liquid cooling channel increases. When the temperature of the liquid cooling medium in the liquid cooling channel decreases, the opening of the self-regulating valve core structure decreases, and the flow rate of the liquid cooling channel decreases.

4. The temperature-self-regulating PET detector device as described in claim 3, characterized in that, The cold plate assembly includes a cold plate body, the liquid cooling channel is installed inside the cold plate body, and a valve core cavity for accommodating the self-adjusting valve core structure is also provided inside the cold plate body. The self-adjusting valve core structure is connected to the main outlet of the liquid cooling channel.

5. The temperature-self-regulating PET detector device as described in claim 4, characterized in that, The self-adjusting valve core structure includes an adjustment knob, a first spring, a valve core body, and a second spring that are sequentially contacted. The adjustment knob is located at the opening of the valve core cavity. The first spring is a shape memory alloy spring, and the second spring is a regular spring. The initial preload of the first spring and the second spring is adjusted by adjusting the adjustment knob to determine the initial position of the valve core body. The first spring deforms according to the heat transferred by the liquid cooling channel. When the first spring is heated and rises, it extends and pushes the valve core body towards the second spring, increasing the opening of the liquid cooling channel. When the first spring is heated and decreases, it shortens and pushes the valve core body towards the first spring.

6. The temperature-self-regulating PET detector device as described in claim 5, characterized in that, The cold plate assembly also includes a cover plate, a sealing structure, and a quick-release connector. The cover plate is detachably connected to the cold plate body. The sealing structure is located between the cover plate and the cold plate body and covers the liquid cooling channel. The quick-release connector is located at one end of the cold plate assembly and is connected to the liquid cooling channel.

7. The temperature-self-regulating PET detector device as described in claim 1, characterized in that, The submodule assembly also includes an adhesive layer, which is connected to the submodule carrier plate and the bimetallic sheet structure respectively.

8. A heat dissipation PET detector device as described in claim 1, characterized in that, A submodule assembly includes a base, multiple supports, and a pair of submodule carrier plates. The two submodule carrier plates are connected to the base via multiple supports. The two submodule carrier plates are placed face-to-face according to a bimetallic spring structure. A cold plate assembly is disposed between the pair of submodule carrier plates. A set of thermally conductive silicone is also connected to the outside of the cold plate assembly. The thermally conductive silicone is disposed between the cold plate assembly and the submodule carrier plates.

9. A temperature-self-regulating PET detector device as described in claim 1, characterized in that, The device also includes a front-end board and a detector housing, the detector housing having multiple sets of sub-module components, and the front-end board being connected to the cold plate assembly.

10. A temperature-self-regulating PET detector device as described in claim 6, characterized in that, The cold plate assembly also includes fastening screws. Both the cover plate and the cold plate body are provided with screw holes. The fastening screws cooperate with the screw holes to fix the cover plate and the cold plate body together.

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