Noise reduction and temperature control static CT equipment and system

Abstract

The invention discloses a noise reduction and temperature control static CT device and system. The static CT equipment comprises an outer cover, a detector ring, a radiation source ring, an inverter ring, a fan and a fan. The outer cover is defined by a front cover plate, a rear cover plate and two side cover plates, and the detector ring, the radiation source ring, the inverter ring, the fan and the fan are all installed in a hollow inner cavity of the outer cover; an air inlet area is formed in an area between the front cover plate and the radiation source ring; the area where the detector ring is located forms a first heat dissipation area; the area where the inverter ring is located forms a second heat dissipation area; an air exhaust area is formed in an area between the rear cover plate and the detector ring as well as the inverter ring; a first air duct is formed from the air inlet area to the fan; a second air channel is formed from the air inlet area to the fan through the first heat dissipation area and the second heat dissipation area; and the air passes through the first heat dissipation area and the second heat dissipation area from the air inlet area, is converged to the air exhaust area and then reaches the fan to form a third air duct. Therefore, external cold air enters all the parts through the multiple air channels, and partitioned cooling control is achieved.

Description

Technical Field

[0001] The present invention relates to a static CT device with noise reduction and temperature control, and also relates to a static CT system including the static CT device, belonging to the technical field of medical devices. Background Art

[0002] CT (Computed Tomography) is a large-scale imaging device widely used in the medical field. It is mainly composed of key components such as X-ray tubes, detectors, racks, beds, and data acquisition and processing systems. During the operation of the CT equipment, the exposure of the X-ray tube will generate a lot of heat, causing the temperature inside the rack to rise rapidly. Since the gain of the detector is very sensitive to temperature changes, the temperature of the detector must be accurately controlled during the scanning process to ensure the stability of the sampling and image quality.

[0003] With the continuous advancement of CT technology, the power of X-ray tubes continues to increase. At the same time, the crystal materials of the new generation of photon counting detectors are more sensitive to temperature, which requires that the working state of the detector must be maintained in a constant low-temperature environment.

[0004] At present, CT equipment mainly adopts the following temperature control methods:

[0005] The first method is to install a large fan on the top of the rack to extract the hot air inside the cavity and suck in cold air from the bottom to achieve the purpose of cooling. However, this structural design can only allow the gas to flow at the edge of the cavity to cool the surface of the component, but cannot penetrate into the interior of the component, so the cooling effect on the interior of the component is not ideal.

[0006] The second method is to equip the CT equipment with a refrigeration unit outside and send the refrigerant into the rack through a pipeline for cooling. For example, patent CN1541619A discloses a cooling method for cooling a barrel rack. In this method, an external refrigeration device generates high-pressure cold air and delivers it to the inside of the rack through a pipeline. However, since this method requires the use of an external refrigeration unit, it is not only costly, but also not conducive to the installation and deployment of CT equipment in hospitals. Summary of the invention

[0007] The primary technical problem to be solved by the present invention is to provide a static CT device with noise reduction and temperature control.

[0008] Another technical problem to be solved by the present invention is to provide a static CT system including the static CT device.

[0009] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0010] According to a first aspect of an embodiment of the present invention, a static CT device with noise reduction and temperature control is provided, comprising:

[0011] An outer cover is formed by a front cover plate, a rear cover plate and side cover plates and has a hollow inner cavity, and a center hole is formed at the center of the outer cover;

[0012] A detector ring is disposed in the hollow inner cavity, wherein the central axis of the detector ring coincides with the central axis of the central hole;

[0013] A ray source ring is arranged outside the detector ring, and the central axis of the ray source ring coincides with the central axis of the central hole, so that each ray source can emit X-rays toward the detector ring;

[0014] An inverter ring is arranged around the outside of the detector ring, the central axis of the inverter ring coincides with the central axis of the central hole; and in the axial direction of the central hole, the inverter ring is located on one side of the radiation source ring;

[0015] A fan is disposed in the hollow inner cavity of the outer cover and is located on the inner bottom surface of the outer cover;

[0016] A fan is arranged in a fan mounting hole at the top of the outer cover;

[0017] The area between the front cover plate and the outer wall of the radiation source ring forms an air inlet area; the area where the detector ring is located forms a first heat dissipation area; the area where the inverter ring is located forms a second heat dissipation area; the area between the rear cover plate and the detector ring and the inverter ring forms an exhaust area; the air inlet area and the exhaust area are both connected to the fan mounting hole;

[0018] A first air duct is formed from the air inlet area to the fan mounting hole of the outer cover; a second air duct is formed from the air inlet area through the first heat dissipation area and the second heat dissipation area to the fan mounting hole of the outer cover; a third air duct is formed from the air inlet area through the first heat dissipation area and the second heat dissipation area and then converges to the exhaust area to reach the fan mounting hole of the outer cover.

[0019] Preferably, the detector ring includes a plurality of detector modules, and the plurality of detector modules are arranged together in a ring shape around the axis of the central hole;

[0020] Wherein, a detector air inlet is provided on a side of each detector module facing the front cover plate, and a detector fan is provided at each detector air inlet.

[0021] Preferably, the detector module comprises:

[0022] A detector housing, wherein the detector housing has a hollow detector cavity, the detector air inlet is connected to the detector cavity, and the detector cavity is also provided with a detector air outlet;

[0023] A detector chip, disposed in the detector cavity, for detecting X-rays;

[0024] A cooling plate, wherein the cold surface of the cooling plate is mounted on the detector chip, and the hot surface of the cooling plate is located in the detector cavity;

[0025] The cold surface of the refrigeration plate always maintains a preset temperature, and the external cold air dissipates heat from the hot surface of the refrigeration plate during the flow of the second air duct or the third air duct.

[0026] Preferably, the static CT device further comprises:

[0027] A controller connected to the fan to control the rotation speed of the fan;

[0028] A temperature control probe is arranged on the hot surface of the refrigeration plate and connected to the controller;

[0029] The fan is connected to the controller, which receives the current hot surface temperature fed back by the temperature control probe and controls the rotation speed of the fan so that the current hot surface temperature is not lower than the preset refrigeration plate condensation temperature.

[0030] Preferably, the inverter ring includes a plurality of inverters, and the plurality of inverters are arranged together in a ring shape around the axis of the central hole, so that each inverter corresponds to each detector module respectively;

[0031] Wherein, each inverter is provided with an inverter fan for blowing air from the second heat dissipation area to the exhaust area.

[0032] Preferably, noise reduction air ducts are provided at the air inlet and the air outlet of the fan.

[0033] Preferably, the inner surface of the front cover plate is provided with a plurality of air duct nozzles, the plurality of air duct nozzles are arranged in a ring shape around the central axis of the central hole, and correspond one by one to the plurality of detector air inlets respectively;

[0034] Among them, a front cover air duct is also formed on the inner surface of the front cover plate, and the front cover air duct is respectively connected with multiple air duct nozzles; the air outlet of the fan faces the front cover air duct, so that the external cold air can enter the air duct nozzle through the front cover air duct.

[0035] Preferably, the bottom of the rear cover plate and the bottom of the side cover plate are both provided with air inlet channels.

[0036] Preferably, a plurality of fan mounting holes are provided on the top of the outer cover, and the fan is installed in each of the fan mounting holes;

[0037] Among them, a part of the fans corresponds to the air inlet area, and another part of the fans corresponds to the air exhaust area.

[0038] According to a second aspect of an embodiment of the present invention, a static CT system is provided, comprising:

[0039] The above-mentioned static CT equipment;

[0040] A CT scanning bed is arranged at one side of the static CT device and can be moved close to or away from the static CT device in a horizontal direction to drive the patient to move in the central hole of the static CT device;

[0041] A control unit is connected to the static CT device to control the static CT device to perform CT scanning on the patient.

[0042] Compared with the prior art, the present invention has the following technical effects:

[0043] (1) In this static CT device, by optimizing the layout design of the outer cover and various components, the internal space of the hollow cavity is divided into four areas: air inlet area A, first heat dissipation area B, second heat dissipation area C, and exhaust area D; and three air ducts are formed according to the positional relationship of the four areas. When the external cold air is sent into the air inlet area A, it can flow into different areas from the three air ducts, thereby cooling down the components in each area, thereby improving the cooling effect of each component by managing the heat zone.

[0044] (2) A cooling plate is installed on the detector chip of the detector module, so that the detector chip is cooled by the cold surface of the cooling plate at a constant temperature, thereby avoiding temperature fluctuations of the detector chip and ensuring the working efficiency of the detector chip.

[0045] (3) By installing noise reduction ducts at the air inlet and outlet of the fan, the noise generated by the wind flow is reduced, and the impact on the wind flow rate is minimal.

[0046] (4) By setting a temperature control probe to detect the hot surface temperature of the cooling plate in real time, the controller is used to control the speed of the fan to prevent the hot surface temperature of the cooling plate from being lower than the condensation temperature of the cooling plate. As a result, condensation will not occur during the entire working process, avoiding affecting the normal operation of the detector chip. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1A schematic diagram of the front structure of a static CT device with noise reduction and temperature control provided by an embodiment of the present invention with the front cover omitted;

[0048] Figure 2 is a schematic diagram of the structure of the front cover;

[0049] Figure 3 A partial cross-sectional schematic diagram of a static CT device with noise reduction and temperature control provided by an embodiment of the present invention;

[0050] Figure 4 It is a schematic diagram of the partitioning of various components in the outer cover and the gas flow direction;

[0051] Figure 5 It is a structural schematic diagram of the detector module;

[0052] Figure 6 It is a schematic diagram of the matching structure of the detector module and the temperature control probe;

[0053] Figure 7 A schematic diagram of the back structure of a static CT device with noise reduction and temperature control provided by an embodiment of the present invention;

[0054] Figure 8 A schematic structural diagram of a static CT system provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0055] The technical content of the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0056] The core technical concept of the embodiment of the present invention is: to divide the area according to the layout of the outer cover and each component, so as to form multiple air flow channels based on the position of each partition. When the external cold air enters the inner part of the outer cover, it can enter the multiple partitions through the multiple air flow channels respectively, so as to cool down different components respectively, thereby greatly improving the temperature control efficiency.

[0057] like Figure 1 to Figure 3 As shown, a static CT device with noise reduction and temperature control provided by an embodiment of the present invention includes an outer cover 1, a detector ring 2, a ray source ring 3, an inverter ring 4, a blower 5 and a fan 6. The static CT device is mainly used to perform CT scans on patients. A large amount of heat will be generated during the CT scan. If the heat accumulates in the static CT device, it will cause various components to fail to work properly. Therefore, it is necessary to use the blower 5 and the fan 6 to perform zoned heat dissipation. The airflow formed in the zoned heat dissipation process will generate huge noise when flowing in the static CT device. Therefore, the noise problem can be solved by performing noise reduction processing on the blower 5.

[0058] Specifically, in this embodiment, Figure 1 and Figure 2As shown, the outer cover 1 is formed by a front cover plate 11, a rear cover plate 12 and two left and right side cover plates 13. The inner part of the outer cover 1 is hollow, forming a hollow cavity 101, so as to provide installation space for components such as the detector ring 2, the ray source ring 3, the inverter ring 4, the blower 5 and the fan 6. In addition, a center hole 102 is formed in the center of the outer cover 1 to perform a CT scan when the CT bed sends the patient into the center hole 102. Preferably, the outer cover 1 can be made of metal structural parts, so that the outer cover 1 has good mechanical strength, so that the outer cover 1 can better protect other components. Of course, the outer cover 1 can also be made of a structure combining plastic material, composite material and metal material. Metal material is used in the part of the outer cover 1 that has high mechanical strength requirements, and composite material or plastic material is used in the part of the outer cover 1 that has relatively low mechanical strength. The self-weight of the outer cover 1 can be reduced, and the self-weight of the static CT device of this embodiment can be reduced.

[0059] like Figure 1 As shown, the detector ring 2, the radiation source ring 3, the inverter ring 4, the blower 5 and the fan 6 and other components are installed in the hollow cavity 101 of the outer cover 1. Among them, the central axis of the detector ring 2, the radiation source ring 3, and the inverter ring 4 coincide with the central axis of the central hole 102. The detector ring 2 includes a plurality of detector modules 21 (such as Figure 3 As shown, a plurality of detector modules 21 are arranged in a ring around the axis of the central hole 102. A detector air inlet 201 is provided on one side of each detector module 21 facing the front cover plate 11, and a detector fan 202 is provided at each detector air inlet 201.

[0060] The ray source ring 3 and the inverter ring 4 are both arranged outside the detector ring 2, and the two are arranged side by side along the axis direction of the central hole 102. Figure 3 As shown, the ray source ring 3 is close to the front cover plate 11, and is formed into a ring shape by a plurality of ball tubes 31 around the axis of the central hole, so that each ball tube 31 can emit X-rays toward each detector module 21. The inverter ring 4 is close to the rear cover plate 12, and is formed into a ring shape by a plurality of inverters 41 around the axis of the central hole, so that each inverter 41 corresponds to each detector module 21. In addition, an inverter fan 411 is installed on each inverter 41.

[0061] The fan 5 is arranged on the inner bottom surface of the outer cover 1, and is used to introduce the external cold air into the hollow cavity 101, so as to cool down each component. The fan 6 is arranged in the fan mounting hole 103 at the top of the outer cover 1, and is used to discharge the gas in the hollow cavity 101 after heat exchange to the outside.

[0062] It is understandable that there is a certain gap between the outer cover 1 and each component, so as to form an air duct for gas to pass through. Figure 4As shown, the area between the front cover plate 11 and the outer wall of the radiation source ring 3 forms an air inlet area A; the area where the detector ring 2 is located forms a first heat dissipation area B; the area where the inverter ring 4 is located forms a second heat dissipation area C; and the area between the rear cover plate 12 and the detector ring 2 and the inverter ring 4 forms an exhaust area D. Thus, the internal space of the hollow cavity 101 is divided into four areas, and the air inlet area A and the exhaust area D are both connected to the fan 6.

[0063] like Figure 4 As shown, the air flows from the air inlet area A to the fan mounting hole 103 of the outer cover, forming a first air duct 110. The air flows from the air inlet area A through the first heat dissipation area B and the second heat dissipation area B to the fan mounting hole 103 of the outer cover, forming a second air duct 120. The air flows from the air inlet area A through the first heat dissipation area B and the second heat dissipation area C, and converges to the exhaust area D before reaching the fan mounting hole 103 of the outer cover, forming a third air duct 130.

[0064] Below, the working principle of zone cooling through multiple air ducts is explained in detail:

[0065] When the fan 5 is started, the fan 5 can introduce the external cold air (generally 25°C air in the CT scanning room) into the air inlet area A. When the fan 6 is started, a low-pressure area will be formed in the area where the fan 6 is located, so that the gas will flow to the fan 6, that is, the gas will flow in the first air duct 110. In this process, since the radiation source ring 3 (surrounded by multiple tubes in a ring shape) is located in the air inlet area A, the cold air flowing in the first air duct 110 will exchange heat with the radiation source ring 3, thereby cooling down the various tubes of the radiation source ring 3.

[0066] Since the detector ring 2 is provided with a detector fan 202, when the detector fan 202 is started, a low-pressure area will also be formed in the first heat dissipation area B where the detector ring 2 is located, so that a part of the cold air in the air inlet area A will be diverted into the first heat dissipation area B, thereby cooling the detector ring 2.

[0067] Furthermore, since the inverter ring 4 is equipped with an inverter fan 411, when the inverter fan 41 is started, a low-pressure area will also be formed in the second heat dissipation area C where the inverter ring 4 is located. A part of the gas flowing out of the first heat dissipation area B directly enters the heat exhaust area D, and the other part flows into the second heat dissipation area C, thereby cooling the inverter ring 4, that is, part of the gas will flow in the second air duct 120. After the gas in the second air duct 120 completes the heat exchange with the inverter ring 4, a part of it will flow directly to the fan 6, and the other part will be blown from the second heat dissipation area C to the exhaust area D through the inverter fan 41.

[0068] The gas exhausted from the detector ring 2 and the gas exhausted from the inverter ring 4 will converge to the exhaust area D, and then flow from the exhaust area D to the fan 6, that is, the gas will flow in the third air duct 130. All the gas flowing to the fan 6 is finally exhausted to the outside, completing a complete heat exchange process.

[0069] like Figure 5 As shown, in a preferred embodiment of the present invention, the detector module 21 includes a detector housing 211, a detector chip 212 and a cooling plate 213. The detector housing 211 has a hollow detector cavity 2111, the detector air inlet 201 is connected to the detector cavity 2111, and a detector air outlet 203 is also provided on the detector cavity 2111. The cold air in the air inlet area A enters the detector cavity 2111 from the detector air inlet 201 and flows out of the detector cavity 2111 from the detector air outlet 203. The detector chip 212 is arranged in the detector cavity 2111 for detecting X-rays. The cold surface of the cooling plate 213 is mounted on the detector chip 212, and the hot surface of the cooling plate 213 is located in the detector cavity 2111. In this embodiment, the cold surface of the cooling plate 213 always maintains a preset temperature to cool the detector chip 212, and the external cold air flows along the second air duct or the third air duct to dissipate heat from the hot surface of the cooling plate 213. Therefore, based on the constant temperature of the cold surface of the cooling plate 213, the cooling plate 213 can be used to accurately control the temperature of the detector chip 212 to ensure the working efficiency of the detector module 21.

[0070] Preferably, Figure 6 As shown, the static CT device also includes a controller 7 and a temperature control probe 8. The controller 7 is used for system control, and the fan 5 is electrically connected to the controller 7. The temperature control probe 8 is arranged on the hot surface of the cooling plate 213 and is connected to the controller 7. During specific operation, the current hot surface temperature of the cooling plate 213 is detected by the temperature control probe 8, and then the temperature value is fed back to the controller 7; after receiving the temperature value, the controller 7 controls the speed of the fan 5 according to a preset program, so that the current hot surface temperature of the cooling plate 213 is not lower than the preset cooling plate condensation temperature. In this way, it can be ensured that no condensation phenomenon will occur during the entire CT scanning process, thereby avoiding affecting the CT scanning results.

[0071] In this embodiment, the condensation temperature of the refrigeration plate can be calculated by the following formula:

[0072]

[0073] Wherein, E represents the saturated water vapor pressure in kPa; t represents the indoor temperature of the CT scanning room.

[0074] For example, when the temperature of a CT scanning room is 25°C and the humidity is 60%RH, the saturated water vapor pressure can be calculated to be 3.167429436kPa. When the CT scanning room is in normal use, the water vapor pressure is approximately 50-60% of the saturated water vapor pressure. Therefore, 3.167429436kPa*60%≈1.9KPa.

[0075] Then, based on E=1.9Kpa, t=16.7°C is calculated, that is, condensation will begin when the refrigeration fin temperature is lower than 16.7°C. Therefore, t=16.7°C is pre-set as the condensation temperature of the refrigeration fin.

[0076] like Figure 2 As shown, in the above embodiment, preferably, the inner surface of the front cover plate 11 is provided with a plurality of air duct nozzles 111, and the plurality of air duct nozzles 111 are arranged in a ring shape around the central axis of the central hole 102, and correspond to the plurality of detector air inlets 201 one by one. In addition, the inner surface of the front cover plate 11 is also formed with a front cover air duct 112, and the front cover air duct 112 is respectively connected with the plurality of air duct nozzles 111; the air outlet of the fan 5 faces the front cover air duct 112, so that the external cold air can enter the air duct nozzle 111 through the front cover air duct 112, and then enter the detector cavity 2111 through the detector air inlet 201. It can be understood that in this embodiment, the cold air in the air inlet area A can be guided by the cooperation of the air duct nozzle 111 and the front cover air duct 112, so as to facilitate entering the detector cavity 2111.

[0077] Continue to refer to Figure 2 As shown, in the above embodiment, preferably, noise reduction air ducts 51 are provided at the air inlet and outlet of the fan 5. The noise reduction air duct 51 is made of noise reduction cotton, which can reduce the noise generated when the wind flows and has little effect on the flow rate of the wind.

[0078] like Figure 7 As shown, in the above embodiment, preferably, the bottom of the rear cover plate 12 and the bottom of the side cover plate 13 are provided with air inlet channels 104, so that the external cold air can be extracted from multiple directions to improve the air intake efficiency. And, more preferably, the top of the outer cover 1 is provided with a plurality of fan mounting holes 103, each of which is provided with a fan 6, and a part of the fans 6 corresponds to the air inlet area A, and the other part of the fans 6 corresponds to the exhaust area D, so as to improve the exhaust efficiency.

[0079] like Figure 8As shown, based on the above embodiment, the embodiment of the present invention further provides a static CT system, which includes the above static CT device 100, a CT scanning bed 200 and a control unit 300. The CT scanning bed 200 is arranged on one side of the static CT device 100, and can be close to or away from the static CT device 100 in the horizontal direction, so as to drive the patient to move in the central hole 102 of the static CT device. The control unit 300 is connected to the static CT device 200 to control the exposure timing of each tube of the ray source ring 3, and correspondingly control each detector module 21 of the detector ring 2 to perform CT image acquisition, thereby realizing CT scanning of the patient.

[0080] It should be noted that the above embodiments are only examples, and the technical solutions of the various embodiments can be combined, all within the protection scope of the present invention.

[0081] It should be understood that the terms "upper", "lower", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0082] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0083] The above is a detailed description of a static CT device and system with noise reduction and temperature control provided by the present invention. For a person skilled in the art, any obvious changes made to it without departing from the essence of the present invention will constitute an infringement of the patent right of the present invention and will bear corresponding legal liability.

Claims

1. A static CT device with noise reduction and temperature control, characterized in that include: An outer cover is formed by a front cover plate, a rear cover plate and side cover plates and has a hollow inner cavity, and a center hole is formed at the center of the outer cover; A detector ring is disposed in the hollow inner cavity, wherein the central axis of the detector ring coincides with the central axis of the central hole; A ray source ring is arranged outside the detector ring, and the central axis of the ray source ring coincides with the central axis of the central hole, so that each ray source can emit X-rays toward the detector ring; An inverter ring is arranged around the outside of the detector ring, the central axis of the inverter ring coincides with the central axis of the central hole; and in the axial direction of the central hole, the inverter ring is located on one side of the radiation source ring; A fan is disposed in the hollow inner cavity of the outer cover and is located on the inner bottom surface of the outer cover; A fan is arranged in a fan mounting hole at the top of the outer cover; The area between the front cover plate and the outer wall of the radiation source ring forms an air inlet area; the area where the detector ring is located forms a first heat dissipation area; the area where the inverter ring is located forms a second heat dissipation area; the area between the rear cover plate and the detector ring and the inverter ring forms an exhaust area; the air inlet area and the exhaust area are both connected to the fan mounting hole; A first air duct is formed from the air inlet area to the fan mounting hole of the outer cover; a second air duct is formed from the air inlet area through the first heat dissipation area and the second heat dissipation area to the fan mounting hole of the outer cover; a third air duct is formed from the air inlet area through the first heat dissipation area and the second heat dissipation area and then converges to the exhaust area to reach the fan mounting hole of the outer cover.

2. The static CT device according to claim 1, characterized in that: The detector ring includes a plurality of detector modules, and the plurality of detector modules are arranged together in a ring shape around the axis of the central hole; Wherein, a detector air inlet is provided on a side of each detector module facing the front cover plate, and a detector fan is provided at each detector air inlet.

3. The static CT device according to claim 2, characterized in that The detector module comprises: A detector housing, wherein the detector housing has a hollow detector cavity, the detector air inlet is connected to the detector cavity, and the detector cavity is also provided with a detector air outlet; A detector chip, disposed in the detector cavity, for detecting X-rays; A cooling plate, wherein the cold surface of the cooling plate is mounted on the detector chip, and the hot surface of the cooling plate is located in the detector cavity; The cold surface of the refrigeration plate always maintains a preset temperature, and the external cold air dissipates heat from the hot surface of the refrigeration plate during the flow of the second air duct or the third air duct.

4. The static CT device according to claim 3, characterized in that Also includes: A controller connected to the fan to control the rotation speed of the fan; A temperature control probe is arranged on the hot surface of the refrigeration plate and connected to the controller; The fan is connected to the controller, which receives the current hot surface temperature fed back by the temperature control probe and controls the rotation speed of the fan so that the current hot surface temperature is not lower than the preset refrigeration plate condensation temperature.

5. The static CT device according to claim 2, characterized in that: The inverter ring includes a plurality of inverters, and the plurality of inverters are arranged together in a ring shape around the axis of the central hole, so that each inverter corresponds to each detector module respectively; Wherein, each inverter is provided with an inverter fan for blowing air from the second heat dissipation area to the exhaust area.

6. The static CT device according to claim 1, characterized in that: The air inlet and the air outlet of the fan are both provided with noise reduction air ducts.

7. The static CT device according to claim 2, characterized in that: The inner surface of the front cover plate is provided with a plurality of air duct nozzles, the plurality of air duct nozzles are arranged in a ring shape around the central axis of the central hole, and correspond one by one to the plurality of detector air inlets respectively; Among them, a front cover air duct is also formed on the inner surface of the front cover plate, and the front cover air duct is respectively connected with multiple air duct nozzles; the air outlet of the fan faces the front cover air duct, so that the external cold air can enter the air duct nozzle through the front cover air duct.

8. The static CT device according to claim 1, characterized in that: The bottom of the rear cover plate and the bottom of the side cover plate are both provided with air inlet channels.

9. The static CT device according to claim 1, characterized in that: A plurality of fan mounting holes are provided on the top of the outer cover, and the fan is mounted in each of the fan mounting holes; Among them, a part of the fans corresponds to the air inlet area, and another part of the fans corresponds to the air exhaust area.

10. A static CT system, characterized in that include: The static CT device according to any one of claims 1 to 9; A CT scanning bed is arranged at one side of the static CT device and can be moved close to or away from the static CT device in a horizontal direction to drive the patient to move in the central hole of the static CT device; A control unit is connected to the static CT device to control the static CT device to perform CT scanning on the patient.

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