Anti-scattering grid assembly with temperature control function

Abstract

The anti-scattering grid assembly with the temperature control function comprises an anti-scattering grid metal body, a graphene heating film and a shading carbon plate, the anti-scattering grid metal body is arranged on the upper side of a detector crystal, the graphene heating film is arranged on the upper side of the anti-scattering grid metal body, and the shading carbon plate is arranged on the upper side of the graphene heating film. One side of the graphene heating film is provided with a power supply positive electrode, the other side is provided with a power supply negative electrode, and the shading carbon plate is arranged on the upper side of the graphene heating film. According to the utility model, the graphene heating film is electrified for heating, the anti-scattering grating metal body is used for transmitting heat to the detector crystal, and the temperature sensor is used for forming closed-loop control so as to ensure that the temperature meets the requirement.

Description

Technical Field

[0001] The utility model relates to the field of medical equipment, in particular to an anti-scattering grid component with a temperature control function. Background Art

[0002] An anti-scatter grid (ASG) is a key component of industrial and medical CT detector crystals, absorbing scattered and refracted X-rays to improve image quality. For example, Patent Publication No. CN209074648U discloses an ASG whose main body comprises a plurality of grid holes arranged in a honeycomb pattern. Another example is Patent Publication No. CN209404801U, which discloses an ASG comprising multiple ASG plates and multiple bases. The ASG plates are connected to the bases, respectively, and the bases absorb at least some of the X-rays that pass through the ASG plates.

[0003] In addition, in the existing technology, the detector crystal technology used in multi-row / slice spiral CT machines attenuates X-rays after passing through the human body. The attenuated X-ray photons then enter the anti-scatter grid on the detector crystal. Then, they enter the X-ray detector crystal, convert the X-ray photons into electrical signals, and transmit them to the data acquisition system (DAS) for signal processing. After analog-to-digital conversion, they are sent to the image reconstruction module for image processing and reconstruction. The components involved in the above process, such as the anti-scatter grid, scintillator, photodiode, and analog-to-digital conversion chip, are all sensitive to temperature changes, which can affect image quality. Therefore, providing a relatively constant temperature working environment for the detector crystal is a key step in the design process.

[0004] In the existing design of detector crystal temperature control systems, one type of situation is to use a heating belt to heat the entire acquisition system, and the value of the temperature sensor is fed back to the control circuit to determine the working mode of the heating belt. For example, the patent with authorization announcement number CN210515061U discloses an integrated CT guide rail heating and monitoring device, which uses an MCU module, an isolation drive module, a heating belt, a temperature sensor and other components to heat the guide rail, thereby achieving temperature control of the entire acquisition system. The overall structure of the device is relatively complex.

[0005] Another type of detector crystal temperature control system design is usually concentrated inside the detector crystal. For example, the patent with publication number CN102283668A discloses an X-ray CT device, which uses a heat source device under the photodiode and buries a temperature sensor manufactured using semiconductor technology inside the detector crystal to form a temperature control system. This device has problems such as high manufacturing difficulty and high cost.

[0006] Another type of detector crystal temperature control system design is to place the heating device below or on the left and right sides of the detector crystal. For example, the patent with authorization announcement number CN214965764U discloses a temperature-controllable CT detector, which has a copper-plated heat transfer structure on the circuit board below the detector crystal to provide heat, and is assisted by a temperature sensor for temperature control. Another example is the patent with authorization announcement number CN216960621U discloses an active heat dissipation detector, which has a cold plate on the PCB board below the detector crystal, and uses a heating module, a heat dissipation cooling crystal and a fan to achieve temperature control. Another example is the patent CN115844430A discloses a CT detector module temperature control structure and a CT scanning device, which uses a semiconductor cooler to perform temperature control on both sides of the detector crystal. Utility Model Content

[0007] The purpose of the utility model is to provide an anti-scattering grid component with a temperature control function, which utilizes a graphene heating film to generate heat when powered, and utilizes the anti-scattering grid metal body to transfer heat to the detector crystal to ensure that its temperature meets the requirements.

[0008] The purpose of this utility model is achieved through the following technical solutions:

[0009] An anti-scattering grid assembly with a temperature control function comprises an anti-scattering grid metal body, a graphene heating film and a light-shielding carbon plate, wherein the anti-scattering grid metal body is arranged on the upper side of the detector crystal, the graphene heating film is arranged on the upper side of the anti-scattering grid metal body, and the graphene heating film is provided with a positive power supply electrode on one side and a negative power supply electrode on the other side, and the light-shielding carbon plate is provided on the upper side of the graphene heating film.

[0010] Connecting plates are provided on both sides of the anti-scatter grid metal body, and the connecting plates are provided with temperature sensor mounting holes, and temperature sensors are installed in the temperature sensor mounting holes.

[0011] The connecting plate is provided with a metal body positioning hole and a metal body mounting hole.

[0012] A plurality of anti-scatter grid hole walls are provided inside the anti-scatter grid metal body, and the anti-scatter grid hole walls are connected to form a plurality of grid holes.

[0013] A gap is left between the lower end of the anti-scattering grid hole wall and the upper surface of the detector crystal.

[0014] The advantages and positive effects of this utility model are:

[0015] 1. The utility model utilizes the graphene heating film to generate heat when it is energized, and utilizes the anti-scattering grid metal body to transfer the heat to the detector crystal to ensure that its temperature meets the requirements.

[0016] 2. The overall structure of the utility model is simple and easy to install. It can be installed by simply fixing the graphene heating film and the light-shielding carbon plate on the upper side of the traditional anti-scattering grid metal body by bonding or other means. At the same time, the thickness of the graphene heating film and the light-shielding carbon plate is relatively thin, which will not increase the volume of the device. At the same time, it also simplifies the design of the mechanical support structure of the detector crystal and reduces the temperature control cost.

[0017] 3. The utility model can control the heat generation by controlling the voltage of the graphene heating film, and can realize precise temperature control of a single detector crystal, thereby improving the CT image noise caused by temperature changes. The control is relatively simple, and the utility model uses temperature sensors arranged on the connecting plates on both sides of the anti-scattering grid metal body to further ensure accurate temperature control.

[0018] 4. The graphene heating film used in the present invention has the advantages of high electrothermal conversion efficiency, fast heating speed, high strength, good flexibility, relatively smooth temperature and shrinkage changes, and is more environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the utility model.

[0020] Figure 2 This is a schematic diagram of heat transfer when the utility model is working.

[0021] Among them, 1 is a light-shielding carbon plate, 2 is a graphene heating film, 201 is the positive pole of the power supply, 202 is the negative pole of the power supply, 3 is the anti-scattering grid metal body, 301 is the connecting plate, 3011 is the temperature sensor mounting hole, 3012 is the metal body positioning hole, 3013 is the metal body mounting hole, 3014 is the temperature sensor, 302 is the anti-scattering grid hole wall, 4 is the detector crystal, and 5 is the support base. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] like Figures 1-2 As shown, the utility model includes an anti-scattering grid metal body 3, a graphene heating film 2 and a light-shielding carbon plate 1, wherein the anti-scattering grid metal body 3 is arranged on the upper side of the detector crystal 4, the graphene heating film 2 is arranged on the upper side of the anti-scattering grid metal body 3, and the graphene heating film 2 is provided with a positive power supply electrode 201 on one side and a negative power supply electrode 202 on the other side, and the light-shielding carbon plate 1 is provided on the upper side of the graphene heating film 2.

[0024] like Figure 1As shown, in this embodiment, connecting plates 301 are provided on both sides of the anti-scatter grid metal body 3, and temperature sensor mounting holes 3011 are provided on the connecting plates 301 for mounting temperature sensors 3014. The temperature sensors 3014 are well known in the art and are commercially available. The temperature sensors 3014 can be mounted in various ways, such as using a film adhesive.

[0025] like Figure 1 As shown, in this embodiment, the connecting plate 301 is further provided with a metal body positioning hole 3012 and a metal body mounting hole 3013. During installation, a positioning pin is first inserted into the corresponding metal body positioning hole 3012 to achieve accurate positioning, and then a bolt is passed through the corresponding metal body mounting hole 3013 to securely connect the anti-scatter grid metal body 3 to the relevant structure.

[0026] The metal body 3 of the anti-scatter grid is mostly made of tungsten metal. The main body of the anti-scatter grid produced by 3D printing is made of sintered tungsten metal powder, and the connecting mounting part is made of non-tungsten metal materials (such as stainless steel) to save costs. Figure 2 As shown, a plurality of anti-scatter grid hole walls 302 are provided inside the anti-scatter grid metal body 3, and each anti-scatter grid hole wall 302 is respectively combined to form a plurality of grid holes focused on the radiation source. This is a well-known technology in the art, for example, see patent CN209074648U.

[0027] like Figure 2 As shown, a gap is left between the lower end of the anti-scatter grid hole wall 302 and the upper surface of the detector crystal 4.

[0028] like Figure 1 As shown, the detector crystal 4 is arranged on a supporting base 5 .

[0029] The working principle of this utility model is:

[0030] When the present invention is installed, the graphene heating film 2 is adhered to the anti-scattering grid metal body 3, and the shading carbon plate 1 is adhered to the upper side of the graphene heating film 2. When the positive pole 201 of the power supply and the negative pole 202 of the power supply are connected, the graphene heating film 2 will be powered on and generate heat. This is a well-known technology in the field. For example, refer to the CN103607795B patent. In addition, the graphene heating film 2 is also the only flexible film of pure carbon atoms that is not doped with other substances among all electric heating films. Its electrothermal conversion efficiency is the highest among all electric heating elements. There is almost no other form of energy loss during the energy conversion process, and the heating speed is fast. At the same time, the graphene heating film 2 also has the advantages of high strength and good flexibility. The temperature and shrinkage changes of the PET-based graphene heating film 2 are relatively smooth and more environmentally friendly. Therefore, the present invention adopts the graphene heating film 2 to achieve the heating function.

[0031] like Figure 2 As shown, when the graphene heating film 2 is heated and energized, part of the heat generated is conducted downward through the anti-scattering grid hole wall 302, and the other part of the heat is transferred downward in the grid hole channel formed between the anti-scattering grid hole walls 302 in the form of thermal radiation, thereby ensuring that the ambient temperature of the detector crystal below meets the requirements.

[0032] The present invention arranges the graphene heating film 2 between the light-shielding carbon plate 1 and the anti-scattering grid metal body 3, wherein the light-shielding carbon plate 1 has the following functions:

[0033] 1. The light-shielding carbon plate 1 is made of insulating and heat-insulating material, which makes the heat generated by the graphene heating film 2 only Figure 2 Passed downward as shown.

[0034] 2. The presence of the light-shielding carbon plate 1 can also ensure the flatness of the soft graphene heating film 2.

[0035] 3. The strength of the light-shielding carbon plate 1 is relatively high, the grid hole wall of the anti-scattering grid metal body 3 is relatively thin, usually 100-130um, and the graphene heating film 2 is also relatively thin, usually ≥50um. Therefore, the light-shielding carbon plate 1 can play a protective role to avoid damage to the anti-scattering grid metal body 3 and the graphene heating film 2 due to bumps.

[0036] In this embodiment, the operating temperature of the detector crystal 4 is generally between 20 and 40°C, with an optimal temperature between 34 and 36°C. The present invention first determines the area of ​​the graphene heating film 2 based on the area of ​​the anti-scattering grid, then customizes the graphene heating film 2 under a DC voltage input of 5.0VDC, and fixes the power electrodes on both sides of the graphene heating film 2 with metal silver paste. In this way, the resistance or square resistance of the graphene heating film 2 is also determined, thereby ensuring accurate control of power-on heating during subsequent use. In this embodiment, the voltage applied between the electrodes on both sides of the graphene heating film 2 ranges from 1.8 to 5.0V.

[0037] In addition, Figure 2As shown, the present invention leaves a gap of 100 to 300 μm between the lower end of the anti-scatter grid hole wall 302 and the upper surface of the detector crystal 4. This is for the following reasons: First, it facilitates the installation of the anti-scatter grid metal body 3 and the detector crystal 2, while also preventing contact between the anti-scatter grid metal body 3 and the detector crystal 2, which could damage each other. Second, heat conducted along the anti-scatter grid hole wall 302 can be further transferred to the detector crystal 4 via heat radiation, preventing localized temperature unevenness in the detector crystal 4 due to direct contact with the anti-scatter grid hole wall 302. To further ensure accurate temperature control, the present invention provides temperature sensor mounting holes 3011 on the connecting plates 301 on both sides of the anti-scatter grid metal body 3 for mounting temperature sensors, allowing them to detect temperature in real time to achieve closed-loop control.

Claims

1. An anti-scattering grid assembly with temperature control function, characterized by: The device comprises an anti-scattering grid metal body (3), a graphene heating film (2) and a light-shielding carbon plate (1), wherein the anti-scattering grid metal body (3) is arranged on the upper side of a detector crystal (4), the graphene heating film (2) is arranged on the upper side of the anti-scattering grid metal body (3), and the graphene heating film (2) is provided with a positive power supply electrode (201) on one side and a negative power supply electrode (202) on the other side, and the light-shielding carbon plate (1) is provided on the upper side of the graphene heating film (2); Connecting plates (301) are provided on both sides of the anti-scatter grid metal body (3), and the connecting plates (301) are provided with temperature sensor mounting holes (3011), and temperature sensors (3014) are provided in the temperature sensor mounting holes (3011).

2. The anti-scattering grid assembly with temperature control function according to claim 1, characterized in that: The connecting plate (301) is provided with a metal body positioning hole (3012) and a metal body mounting hole (3013).

3. The anti-scattering grid assembly with temperature control function according to claim 1, characterized in that: A plurality of anti-scatter grid hole walls (302) are provided inside the anti-scatter grid metal body (3), and the anti-scatter grid hole walls (302) are respectively connected to form a plurality of grid holes.

4. The anti-scattering grid assembly with temperature control function according to claim 3, characterized in that: A gap is left between the lower end of the anti-scattering grid hole wall (302) and the upper surface of the detector crystal (4).

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