CN109091160B

CN109091160B - Dehumidifying device for positron emission tomography system

Info

Publication number: CN109091160B
Application number: CN201810739558.XA
Authority: CN
Inventors: 于庆泽
Original assignee: Sinounion Healthcare Inc
Current assignee: Sinounion Healthcare Inc
Priority date: 2018-07-06
Filing date: 2018-07-06
Publication date: 2022-03-08
Anticipated expiration: 2038-07-06
Also published as: CN109091160A

Abstract

The invention relates to a dehumidifying device for a positron emission tomography system, which can have a dehumidifying function without adding an active dehumidifier and a corresponding pipeline. The dehumidifying device comprises a shell for sealing the detector, wherein the shell comprises an annular peripheral surface and an end surface matched with the annular peripheral surface, the annular peripheral surface is formed by splicing a plurality of substructures such as plane plates, and each substructure is provided with a through hole; one surface of each substructure, which is far away from the detector, is provided with a dehumidifying component with a built-in desiccant, and the dehumidifying component comprises a first state which is communicated with the through hole to adsorb water vapor in the shell; and a second state of discharging the water vapor adsorbed by the desiccant in the dehumidification assembly outside the housing.

Description

Dehumidifying device for positron emission tomography system

Technical Field

The invention relates to a dehumidifying device for a positron emission tomography system, the positron emission tomography system and a control method of the dehumidifying device.

Background

In the field of medical imaging, a Positron Emission Tomography (PET) system is playing an increasingly important role as a functional imaging device. PET is an imaging technology for non-invasively displaying the functions and metabolism of human organs, and the working principle of PET is to convert substances necessary for the metabolism of biological life, such as: glucose, protein, nucleic acid, fatty acid, labeled short-lived radionuclides (such as 18F, 11C and the like) are injected into a human body, and the characteristics of reflecting the metabolic activity of life are reflected through images by utilizing the fact that the metabolic states of different tissues of the human body are different, such as vigorous glucose metabolism and more accumulation in hypermetabolic malignant tumor tissues, so that the purpose of early diagnosing diseases such as tumors and the like is achieved. The most core component in the PET system is a detector, a signal amplifying device used by the traditional PET detector is photomultiplier tubes (PMT for short), temperature drift is the basic characteristic of the PMT, the PET based on the photomultiplier tubes has low requirements on the absolute temperature of work, and the main requirements are the balance and stability of the internal temperature of the system. With the development of the technology, Silicon photons (referred to as SiPM for short) are a brand new high-sensitivity Silicon photoelectric detector, and the SiPM, as a novel semiconductor detector, has many advantages compared with the conventional photomultiplier tube (PMT), such as higher detection efficiency, working at low voltage rather than the conventional high voltage, and insensitivity to magnetic field, which are all beneficial to obtaining higher-quality detection signals, thereby improving the image quality. From the structure and price, the system has the advantages of small volume and compact structure, the price is lower, the SiPM technology is applied to represent the development direction of the PET technology, and domestic and foreign manufacturers research and develop the PET detector and the PET system based on the SiPM technology.

The PET system based on the traditional photomultiplier has low requirements on the working temperature, the main requirement is the stability of the temperature inside the system, and the PET based on the traditional photomultiplier in the existing commercial equipment adopts an air cooling heat dissipation mode. However, for the SiPM-based PET system, due to the self characteristics of the SiPM, the light output of the SiPM-based PET system is determined to be more sensitive under the low temperature condition, so that the performance of the SiPM detector can be improved by reducing the working temperature of the SiPM chip, so that the existing SiPM-based PET system mostly adopts a water cooling mode to dissipate heat, the greatest challenge of the cooling system lies in the problem of condensation of water vapor at low temperature, namely the so-called condensation problem, and the moisture can be reduced to reduce the condensation risk, in the existing method, when the water cooling system is used, the system simultaneously uses an active professional dehumidifier, so that the system is reduced to a certain corresponding moisture through the dehumidifier, and then the water cooler is ensured to work at a lower temperature of about 1-4 ℃. The dewing problem of the system is solved through the action of the dehumidifier. The disadvantages of this are: firstly, a dehumidifier and a dehumidifier pipeline are added, so that the cost and complexity of the system are increased; secondly, the dehumidifier is an independent active device, needs to occupy a certain area, and is provided with an outdoor unit, so that the occupied space and the installation complexity of the device are increased.

Disclosure of Invention

Technical problem to be solved

The invention provides a dehumidifying device for a positron emission tomography system, which can have a dehumidifying function without adding an active dehumidifier and a corresponding pipeline.

(II) technical scheme

A first object of the present invention is to provide a dehumidifying apparatus for a positron emission tomography system, comprising: the shell of the sealed detector comprises an annular peripheral surface and an end surface matched with the annular peripheral surface, wherein the annular peripheral surface is formed by splicing a plurality of substructures, and each substructure is provided with a through hole;

each substructure is provided with a dehumidifying component with a built-in desiccant, and the dehumidifying component comprises a first state which is communicated with the through hole to adsorb water vapor in the shell; and a second state of discharging water vapor adsorbed by the desiccant inside the dehumidifying component out of the housing.

Optionally, all the substructures of the annular outer peripheral surface are the same, and each substructure is a planar plate, and a side of each planar plate facing away from the detector is provided with the dehumidifying component.

Optionally, the dehumidification assembly enters a first state when the PET is in a scanning state and enters a second state when the PET is in a non-scanning state.

Optionally, the dehumidification assembly comprises: the dehumidifying device comprises a dehumidifying shell, an upper sealing cover, a lower sealing cover, a partition net, a first electromagnetic pull rod connected with a controller, a second electromagnetic pull rod connected with the controller and a heating assembly;

wherein the dehumidifying case, the upper sealing cover and the lower sealing cover form a sealed dehumidifying box;

the partition net divides the dehumidifying box into two independent spaces for accommodating a desiccant;

a first electromagnetic pull rod matched with the upper sealing cover is arranged in the first space, and a second electromagnetic pull rod matched with the lower sealing cover is arranged in the second space, so that the first space and the second space are respectively communicated with the inside and the outside of the shell of the sealing detector;

and a heating component for heating the drying agent in each space is arranged on the partition plate net.

Optionally, the desiccant is reversible hygroscopic silica gel msio2.nh2 o; m and n are natural numbers;

and/or, the color of the hygroscopic silica gel changes with the increase of the hygroscopic amount;

or the drying agent is a cobalt-free allochroic silica gel drying agent;

or the drying agent is a drying agent mixed by cobalt-free allochroic silica gel drying agent and fine-pore silica gel.

Optionally, a sealing strip is adopted to seal between each plane plate and a mounting base plate for bearing the detector in the positron emission tomography system PET,

the end face comprises a polygonal outer edge which is adjacent to each plane plate of the annular outer peripheral surface, and a sealing strip is used for sealing between each edge of the polygonal outer edge and each plane plate.

Optionally, each planar plate of the annular outer peripheral surface is of a rectangular parallelepiped structure;

and/or each plane plate is of a cuboid structure made of an aluminum plate;

and/or the length of each plane plate is 321.5mm, the width of each plane plate is 260mm, and the diameter of an inscribed circle formed by splicing all the plane plates is 1200 mm;

and/or the diameter of the through hole on each plane plate is 160 mm.

Optionally, the number of the plane plates is 12, 8 or 6.

Optionally, the end face is formed by splicing a plurality of rear cover plates of the same structure, and each rear cover plate is provided with one side of the polygonal outer edge of the end face.

It is a second object of the present invention to provide a positron emission tomography system comprising: a housing, and a dehumidifying apparatus as described above located within the housing.

A third object of the present invention is to provide a control method of a dehumidifying apparatus, comprising:

judging the state of the PET;

if the state is a scanning state, the first electromagnetic pull rod is powered on, the second electromagnetic pull rod is powered off, the lower sealing cover is in an opening position, and the upper sealing cover is in a closing sealing position; the drying agents of the first space and the second space are respectively communicated with the inner space of the shell of the closed detector;

if the state is a non-scanning state, the first electromagnetic pull rod is powered off, the second electromagnetic pull rod is powered on, the upper sealing cover is in an open position, the lower sealing cover is in a closed sealing position, and the drying agents in the first space and the second space are respectively communicated with the space outside the shell of the closed detector.

(III) advantageous effects

The dehumidifying device for the positron emission tomography system can reduce the humidity of the inner ring space, reduce the cost of the system, reduce the installation space requirement of the system, reduce the complexity of the system and improve the running stability of the system under the condition of completely not using an active industrial dehumidifier.

Drawings

FIG. 1 is a schematic partial structural diagram of a dehumidifying apparatus for a positron emission tomography system according to an embodiment of the present invention;

FIG. 2 is a schematic front view of the dehumidification apparatus of FIG. 1 with end surfaces removed to better illustrate the inner annular space;

FIG. 3 is a simplified schematic diagram of a dehumidification assembly of the dehumidification apparatus of FIG. 1;

FIG. 4 is a schematic structural view of a rear cover plate in the dehumidifying apparatus of FIG. 1;

FIG. 5 is a schematic view of a D-seal used in the dehumidification apparatus of FIG. 1;

FIG. 6 is a schematic view of a cylindrical inner wall;

FIG. 7 is a schematic representation of PET in an embodiment of the invention.

[ description of reference ]

1: installing a foundation plate; 2: a dehumidification assembly; 3: a flat plate; 4: a sealing strip; 5: a rear cover plate; 6: a cylindrical inner wall; 7: a central bore; 8: a detector; 9: an inner annular space; 10: a dehumidification shell; 11: an upper sealing cover; 12: a lower sealing cover; 13: a spacer mesh; 14: a first electromagnetic pull rod; 15: a second electromagnetic pull rod; 16: a housing.

Detailed Description

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

Referring to fig. 1 and 2, in the present embodiment, there is provided a dehumidifying apparatus for a positron emission tomography system, the dehumidifying apparatus including: a shell for sealing the detector 8, wherein the shell comprises an annular peripheral surface, the annular peripheral surface is formed by splicing a plurality of plane plates 3, and each plane plate 3 is provided with a through hole (not shown in the figure);

the dehumidification component 2 with the built-in desiccant is installed on one side of each plane plate 3, which is far away from the detector 8, and the dehumidification component 2 comprises: the dehumidification assembly comprises a first state which is communicated with the through hole to adsorb water vapor in the shell under low-temperature environment (low-temperature environment where the detector is located), and a second state which is used for discharging the water vapor adsorbed by the desiccant in the dehumidification assembly out of the shell.

The annular outer peripheral surface shown in fig. 1 and 2 is formed by splicing a plurality of flat plates, because the flat plates are easier to manufacture and better fit with the dehumidifying module for easy sealing. In a specific implementation process, the annular outer peripheral surface may also be spliced by other substructures, for example, an arc surface, or an arc surface and a plane plate appear alternately to form an annular outer peripheral surface by splicing, and the like.

In a specific application, more than two dehumidification assemblies can be arranged on each plane plate, and accordingly, each dehumidification assembly corresponds to one through hole in the plane plate. Further, the dehumidification assemblies shown in fig. 1 of this embodiment are all located on a side of the plane plate away from the detector, in other embodiments, the dehumidification assemblies may also be located on a side of the plane plate close to the detector, and this embodiment is adjusted according to actual needs.

The number of the flat plates shown in fig. 1 and 2 is 12, that is, the annular outer circumferential surface in fig. 1 and 2 is formed by splicing 12 flat plates. The number of the plane plates is not limited in this embodiment, and may be, for example, 6, 8, 4, 5, etc. according to the actual requirement.

As shown in fig. 1, the housing of the seal detector 8 in the present embodiment further includes an end face; the end face comprises a polygonal outer edge and a circular inner edge, each side of the polygonal outer edge is abutted with each plane plate 3 of the annular outer peripheral surface, and the circular inner edge is abutted with, i.e. hermetically connected with, one end of a cylindrical inner wall 6 of the PET for forming a scanning space;

as shown in fig. 6, the other end of the cylindrical inner wall 6 is connected to a central hole wall (a central hole 7 shown in fig. 1) of a mounting base plate 1 of the PET for carrying the detector, and each of the planar plates 3 of the annular outer peripheral surface is fixed to the mounting base plate 1.

In practice, the end face shown in fig. 1 may be composed of a plurality of identically configured back cover plates 5, each back cover plate 5 having one side of the polygonal outer edge of the end face, as shown in fig. 4.

In fig. 1, the number of the back cover plates 5 is the same as the number of the plane plates 3, that is, one back cover plate is matched with one plane plate, and in other embodiments, the number of the back cover plates may not be the same as the number of the plane plates and may be determined according to an actual manufacturing process. In this embodiment, a detachable structure having an end face composed of a back cover plate is provided for the post-maintenance of PET, the back cover plate of this embodiment is made of plastic material by suction molding, and of course, the back cover plate may be made of aluminum material or steel material by stamping. In this embodiment, the sealing between the adjacent back cover plates can be realized by using a sealing tape.

In a specific application, a sealing strip 4 (e.g., a D-shaped sealing strip shown in fig. 5) is used for sealing between each flat plate 3 shown in fig. 1 and the installation base plate 1, and similarly, a sealing strip (e.g., a D-shaped sealing strip) is used for sealing between each flat plate 3 and each side of the polygonal outer edge.

That is, all the connections of the housing of the sealed detector need to be sealed, for example, sealing strips can be used to seal the respective connection areas, so as to ensure the low temperature of the space where the detector is located and the moisture absorption capacity of the dehumidification assembly. That is to say, the space at detector place belongs to the space of liquid cooling operation, needs the strict control humidity, when adopting the water-cooling mode to cool down the detector, when the space at detector place was the confined space, and outside vapor can't get into, and then dehumidification subassembly can guarantee the dehumidification effect.

In this embodiment, the structures of all the above-mentioned plane plates are the same, and each plane plate is a rectangular parallelepiped structure; for example, each of the flat panels may be a rectangular parallelepiped structure made of aluminum plate; the length of the plate is 321.5mm, the width of the plate is 260mm, and the diameter of an inscribed circle formed by splicing all the plane plates is 1200 mm; and the diameter of the through hole on the plane plate may be 160 mm. In this embodiment, the flat plate is provided to facilitate the sealing connection of the dehumidification assembly and the flat plate.

In other embodiments, the size of the flat panel can be set according to needs, and the structure of all the flat panels is not necessarily the same.

In addition, it will be appreciated that the dehumidification assembly 2 in this embodiment enters a first state when the PET is in the scanning state and a second state when the PET is in the non-scanning state. Fig. 3 is a schematic diagram illustrating only one dehumidifying module, and the specific structure of the dehumidifying module is not limited in this embodiment, and may be adjusted according to actual needs.

As shown in fig. 3, the dehumidifying assembly includes: a dehumidifying shell 10, an upper sealing cover 11, a lower sealing cover 12, a partition net 13, a first electromagnetic pull rod 14 connected with a controller, a second electromagnetic pull rod 15 connected with the controller and a heating assembly (not shown in the figure);

wherein the dehumidifying case 10, the upper sealing cover 11 and the lower sealing cover 12 form a sealed dehumidifying box;

the partition net 13 divides the dehumidifying box into two independent spaces for accommodating a desiccant; the spacer mesh may be referred to as a mesh-like structure.

A first electromagnetic pull rod 14 matched with the upper sealing cover 11 is arranged in the first space, and a second electromagnetic pull rod 15 matched with the lower sealing cover 12 is arranged in the second space, so that the first space and the second space are respectively communicated with the inside and the outside of the shell of the closed detector;

the partition net 13 is provided with a heating means for heating the desiccant in each space.

That is, in a specific application, the first electromagnetic pull rod 14 is powered on, the second electromagnetic pull rod 15 is powered off, the lower sealing cover 12 can be in the open position, and the upper sealing cover 11 is in the closed sealing position; the drying agents of the first space and the second space are respectively communicated with the inner space of the shell of the closed detector; if the first electromagnetic pull rod 14 is powered off, the second electromagnetic pull rod 15 is powered on, the upper sealing cover 11 is in an open position, the lower sealing cover 12 is in a closed sealing position, and the drying agents in the first space and the second space are respectively communicated with the space outside the shell of the closed detector.

The lower sealing cover 12 of the dehumidifying module 2 may correspond to the through hole of the planar plate 3 after being opened.

In practical application, the dehumidification box can be connected with the plane plate 3 in a threaded connection mode, and the edge of the dehumidification box 10 is sealed with the plane plate through a sealing strip; the dehumidifying box 10 in this embodiment may be made of a transparent material so as to facilitate observation of the state of the desiccant therein.

The first electromagnetic pull rod and the second electromagnetic pull rod of the dehumidification assembly can be electrically connected with the controller of the PET, the heating assembly is connected with the power supply, accordingly, the occupied space of the PET can be better reduced, the installation complexity can be reduced, and meanwhile, the detector of the PET can work at a lower temperature (about 1-4 ℃).

The drying agent in the dehumidification assembly is under the normal temperature environment: when the relative humidity of the environment is 20% RH, the moisture absorption rate is more than or equal to 25%. The desiccant used in each dehumidification module in the PET of this embodiment weighs 0.2kg, and the total desiccant weight of all dehumidification modules is 2.4 kg.

The drying agent of the embodiment can be reversible hygroscopic silica gel mSiO2.nH 2O; m and n are natural numbers; and/or, the color of the hygroscopic silica gel changes with the increase of the hygroscopic amount;

or the drying agent is a cobalt-free allochroic silica gel drying agent; or the drying agent is a drying agent mixed by cobalt-free allochroic silica gel drying agent and fine-pore silica gel.

The silica gel desiccant is a high-activity adsorbing material, and is usually prepared by reacting sodium silicate with sulfuric acid, and performing a series of post-treatment processes such as aging, acid soaking and the like. Silica gel is an amorphous substance and has a chemical molecular formula of mSiO2.nH 2O. Insoluble in water and any solvent, non-toxic, odorless, stable in chemical property, and non-reactive with any substance except strong alkali and hydrofluoric acid. The chemical composition and physical structure of silica gel determine that it has the characteristic of difficult substitution of many other similar materials. The silica gel drying agent has high adsorption performance, good thermal stability, stable chemical property, higher mechanical strength and the like.

In addition, the cobalt-free allochroic silica gel desiccant is orange or semitransparent glass-like granules in appearance, has strong moisture absorption capacity, and generates obvious color change along with the increase of moisture absorption amount in the moisture absorption process. The cobalt-free allochroic silica gel desiccant can be used alone or in combination with fine-pored silica gel (5% or more). When the fabric is not wetted, the fabric is orange yellow, gradually turns into light green after moisture absorption, and continuously absorbs moisture to turn into dark green, and then the fabric needs to be replaced by new silica gel or regenerated for use. The cobalt-free allochroic silica gel drying agent is environment-friendly without cobalt chloride and is a substitute of blue silica gel.

Furthermore, by utilizing the reversible characteristic of silica gel after moisture absorption, the moisture absorption silica gel absorbs moisture in the inner ring space where the PET detector is positioned during PET scanning, so that the humidity in the detector space is reduced. When the PET stops scanning, for example, at night, the hygroscopic silica gel is heated to restore the absorption characteristic. Moisture generated in the reversible process is vented to the outer annular space of the detector. Thereby achieving lower humidity in the inner annular space than in the scanning room, and usually, in the case of 50% humidity in the system room, the humidity in the inner annular space can be controlled to be lower than 20%. When PET does not scan, reversible silica gel is heated to evaporate water vapor, so that the humidity of the inner ring space of the system (namely the inside of the shell of the closed detector) is not influenced, and in addition, the outer ring space (the outside space of the shell) and the room are not completely sealed, so when the humidity of the outer ring space exceeds the humidity of the room, a dehumidifier in the room works to ensure that the humidity of the outer ring space and the room are basically kept at the same humidity.

Based on the dehumidification assembly shown in fig. 3, the present embodiment provides a control method, including the following steps:

s1, judging the state of the PET;

s2, if the state is a scanning state, the first electromagnetic pull rod is powered on, the second electromagnetic pull rod is powered off, the lower sealing cover is in an opening position, and the upper sealing cover is in a closing sealing position; the drying agents of the first space and the second space are respectively communicated with the inner space of the shell of the closed detector;

and S3, if the state is a non-scanning state, the first electromagnetic pull rod is powered off, the second electromagnetic pull rod is powered on, the upper sealing cover is in an open position, the lower sealing cover is in a closed sealing position, and the drying agents in the first space and the second space are respectively communicated with the space outside the shell of the closed detector.

Fig. 3 illustrates a structure of the dehumidifying assembly, in other embodiments, the upper sealing cover and the lower sealing cover may further be provided with a water vapor exchange window, and the dehumidifying assembly is communicated with the inner space and the outer space of the housing by controlling the opening and closing of the water vapor exchange window on the upper sealing cover and the lower sealing cover. In specific application, after heating for a certain time, the hygroscopic silica gel can stop heating after the water vapor is completely discharged, and meanwhile, the dehumidifying component is isolated from the outer space of the shell. The structure of the dehumidifying module in this embodiment is only an example, and the dehumidifying module capable of realizing the above-mentioned functions can be used.

As shown in fig. 7, another aspect of the present invention also provides a Positron Emission Tomography (PET) system, which may include: an enclosure 16 and a dehumidifying apparatus as described in any of the above located within the enclosure 16.

In fig. 7, the dehumidifying device is a sealed whole with respect to the scanning space of the patient, the space between the housing and the dehumidifying device constitutes an outer annular space, and the space formed in the dehumidifying device can be referred to as an inner annular space 9.

The outer annular space is isolated from the room by the enclosure system. The power supply and the electric wires of the system are usually arranged in the outer annular space. The inner ring space arrangement detector unit belongs to a core part, is a liquid cooling operation space and needs to strictly control humidity. When the humidity of the inner ring space is about 50% of relative humidity, the control mode of the dehumidification assembly is adopted, the humidity of the inner ring space can be controlled to be 20% of loudness and humidity, and the water temperature of the water cooling system can be controlled to be 1-4 ℃ without condensation.

It can be understood that, in this embodiment, the dehumidification assemblies described in any of the above embodiments are disposed on the outer circumferential surface of the inner ring space and the outer circumferential surface of the outer ring space of the PET, and the inner ring space of the PET is controlled by the controller to maintain a lower humidity (the lower humidity is generally understood to be not higher than 20% RH), so that the detector of the PET operates in a low temperature environment (the low temperature environment generally understood in the PET that the water temperature of the cooling water reaches 1 to 4 ℃, and at this time, the detector of the PET is located at 1 to 5 ℃ in the low temperature environment).

Typically, PET is located in a separate room in a hospital, for which the humidity in the outer annular space is substantially the same as the humidity in the room. The inner ring space keeps the leakproofness, and the inside drier that adopts high moisture absorption of dehumidification subassembly this moment can reduce the maintenance cost of PET equipment.

The outer annular space of the PET in fig. 7 is isolated from the room by a housing, the power supply, wires and the like of the detector and the like are generally arranged in the outer annular space, and the core components of the PET, such as the detector and the liquid cooling component, are arranged in the inner annular space.

In this embodiment, the spatial volume of the inner ring space of PET is:

π(R²-r²) xD ═ pi (0.6 × 0.6 to 0.38 × 0.38) × 0.26 ═ 0.176 cubic meters;

the water content of the saturated humid air is 17.68 g/cubic meter under the condition of 20 ℃;

the moisture content of the inner annular space is 17.68x0.176 ═ 3.11g, and the moisture absorption of the silica gel desiccant in the case of a relative humidity of 50 is > -20% according to the GB10455-89 standard, so that the moisture absorption calculated for 2.4kg of silica gel desiccant is 480g, which is much greater than the moisture content of the inner annular space of the detector.

In the specific implementation process, the inner ring space and the outer ring space are both of a closed structure, so that the inner ring can be kept dry well, and a water cooling system of the detector can work at a low temperature to avoid condensation. The color of the reversible silica gel can be seen through the observation window on the outer cover, the moisture absorption capacity of the silica gel is reduced after the reversible process is carried out for a plurality of times, and the reversible silica gel is still colored after the reversible silica gel is observed and needs to be replaced. From the practical test situation, when the temperature between scans can be controlled between RH 40-RH 60, the method needs about 6 months to replace the silica gel.

The PET does not need an active industrial dehumidifier in the center of the prior art, reduces the cost of the PET, reduces the installation space and the process complexity, and improves the running stability of the PET.

It should be noted that, the two connections of the shell space where the sealed detector in the current PET is located and the shell outer space are used, one is power connection, the power lines are connected with an external power supply through wire holes (which may be circular) on the installation base plate, the sealant is used between each power line to fill the gaps between the cables, and the sealant is used to fill the gaps to realize sealing after the power lines pass through the wire holes of the installation base plate; the other type is that the data line is connected with the data processing board, the data line is a flat line, so the data line is connected with the data processing board through a waist-shaped hole in the installation foundation board, after the data line is bundled, a gap between the lines is filled with sealant, and the gap of the waist-shaped hole in the installation foundation board is filled with the sealant to realize sealing. In this embodiment, the structure of the probe and the connection mode of the power line of the probe are not changed, and the implementation can be performed according to the prior art. Particularly, when the dehumidification assembly of this embodiment is located on one side of the planar plate facing the housing, the power line of the dehumidification assembly may be connected to the external power supply through the wire hole of the installation base plate, or the data line of the dehumidification assembly may be connected to the controller of the dehumidification assembly through the waist-shaped hole of the installation base plate.

It should be understood that the above description of specific embodiments of the present invention is only for the purpose of illustrating the technical lines and features of the present invention, and is intended to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, but the present invention is not limited to the above specific embodiments. It is intended that all such changes and modifications as fall within the scope of the appended claims be embraced therein.

Claims

1. A dehumidification apparatus for a positron emission tomography system, comprising: the shell is used for sealing the SiPM detector and comprises an annular peripheral surface and an end surface matched with the annular peripheral surface, the annular peripheral surface is formed by splicing a plurality of substructures, and each substructure is provided with a through hole; each substructure is a plane plate, and a dehumidification component with a built-in desiccant is arranged on one surface of each plane plate, which is far away from the detector;

the dehumidification assembly comprises a first state which is communicated with the through hole to adsorb water vapor in the shell under a low-temperature environment; and a second state in which water vapor adsorbed by the desiccant inside the dehumidifying component is discharged outside the housing;

the dehumidifying component enters a first state when the PET is in a scanning state and enters a second state when the PET is in a non-scanning state;

all connections of the shell of the sealed SiPM detector are sealed connections so as to ensure the low temperature of the space where the SiPM detector is located and the moisture absorption capacity of the dehumidification assembly;

the dehumidification assembly comprises: the dehumidifying device comprises a dehumidifying shell, an upper sealing cover, a lower sealing cover, a partition net, a first electromagnetic pull rod connected with a controller, a second electromagnetic pull rod connected with the controller and a heating assembly;

a first electromagnetic pull rod matched with the upper sealing cover is arranged in the first space, and a second electromagnetic pull rod matched with the lower sealing cover is arranged in the second space, so that the first space and the second space are respectively communicated with the inside and the outside of the shell of the sealed SiPM detector;

2. A dehumidifying device as claimed in claim 1,

all the substructures of the annular outer peripheral surface are the same.

3. A dehumidifying device as claimed in claim 1 wherein the desiccant is reversible hygroscopic silica gel msio2.nh2 o; m and n are natural numbers;

4. A dehumidifying device as claimed in any one of claims 2 or 3,

sealing the flat plates and a mounting base plate used for bearing the SiPM detector in the PET by adopting sealing strips,

5. A dehumidifying device as claimed in claim 2 or 3,

each plane plate of the annular outer peripheral surface is of a cuboid structure;

alternatively, the diameter of the through hole in each plane plate of the annular outer peripheral surface is 160 mm.

6. A dehumidifying device as claimed in claim 5,

the number of the plane plates is 12, 8 or 6.

7. A dehumidifying device as claimed in claim 4,

the end face is formed by splicing a plurality of rear cover plates with the same structure, and each rear cover plate is provided with one side of the polygonal outer edge of the end face.

8. A positron emission tomography system comprising: housing, further comprising a dehumidifying unit as claimed in any one of the preceding claims 1 to 7 located within the housing.