CT machine

Abstract

The utility model discloses a CT machine, and relates to the technical field of medical instruments. The CT machine comprises a shell, a scanning body and a noise reduction structure. The scanning main body is arranged in the shell; the silencing structure is arranged on the inner side of the shell; wherein the noise reduction structure comprises a first reinforcing rib, the first reinforcing rib is connected with the shell, and a plurality of noise reduction cavities with openings facing the scanning main body are defined by the first reinforcing rib and the shell. According to the technical scheme, noise transmitted to the outside by the CT machine can be reduced, so that in the scanning process, the noise felt by a patient and a doctor is smaller, and the experience feeling and comfort feeling of the patient and the doctor are improved.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a CT scanner. Background Technology

[0002] CT scanners have complex internal structures and generate significant overall noise, primarily from the cooling fans of various components. This leads to a poor experience and lack of comfort for both patients and doctors. While some technologies aim to reduce noise by optimizing the sound source, such as optimizing the fan to produce less noise, these methods are limited. Adjusting the fan structure and performance parameters may degrade fan performance, affecting its normal operation and effectiveness, while still leaving considerable noise. Utility Model Content

[0003] This application provides a CT scanner that can reduce noise propagating to the outside world during CT scanner operation, so that patients and doctors experience less noise during scanning, thereby improving the experience and comfort of patients and doctors.

[0004] In a first aspect, embodiments of this application provide a CT scanner, comprising:

[0005] case;

[0006] The scanning body is disposed within the housing; and

[0007] A noise-absorbing structure is provided inside the housing;

[0008] The noise reduction structure includes a first reinforcing rib, which is connected to the housing and together with the housing forms a plurality of noise reduction cavities with openings facing the scanning body.

[0009] In one embodiment, the CT scanner further includes:

[0010] A perforated plate is disposed at the opening of the silencing cavity. The perforated plate has multiple through holes, and the silencing cavity is connected to at least one of the through holes.

[0011] In one embodiment, the diameter of the perforation is D, and the depth of the silencing cavity is H, wherein 0.5mm≤D≤2mm, and 10mm≤H≤50mm.

[0012] In one embodiment, the porosity of the perforated plate is P%, where 15 ≤ P ≤ 25.

[0013] In one embodiment, the perforated plate has a plurality of second reinforcing ribs on the side opposite to the first reinforcing rib, and the plurality of second reinforcing ribs are spaced apart in the length and width directions of the perforated plate.

[0014] In one embodiment, the opening of the silencing cavity is arranged in the form of an equilateral polygon, and the plurality of silencing cavities are distributed in an array.

[0015] In one embodiment, the opening shape of the silencing cavity is a regular hexagon with a side length of L, wherein 10mm≤L≤150mm.

[0016] In one embodiment, the noise reduction structure further includes a sound-absorbing element disposed within the noise reduction cavity.

[0017] In one embodiment, the sound-absorbing component includes polyester fiber cotton, PU sponge, or glass wool, and the sound-absorbing component fills the sound-absorbing cavity.

[0018] In one embodiment, the housing includes:

[0019] Base frame;

[0020] The front cover and the rear cover are mounted opposite each other on the base frame; and

[0021] The top cover is located above the base frame and is connected to the front cover, rear cover and base frame;

[0022] The scanning body includes a heat dissipation component, the top cover is provided with a heat dissipation vent, and the noise reduction structure is provided at least inside the top cover.

[0023] The CT scanner based on the embodiments of this application provides a first reinforcing rib on the inner side of the housing, which together with the housing forms a noise-absorbing cavity with an opening facing the scanning body. On the one hand, the opening of the noise-absorbing cavity faces the scanning body, which can better receive the noise generated by the scanning body. After the sound waves enter the noise-absorbing cavity, they are reflected and scattered multiple times through the cavity structure, and the energy gradually attenuates, thus absorbing the noise. On the other hand, the first reinforcing rib is connected to the housing, which enhances the structural rigidity of the housing and reduces the secondary noise generated by the vibration of the housing, thus achieving the dual effects of active noise reduction and passive sound absorption. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of a CT scanner according to an embodiment of the present application after removing the front cover;

[0026] Figure 2This is a cross-sectional structural diagram of the top cover and perforated plate in the assembled state in one embodiment of the CT machine of this application;

[0027] Figure 3 This is a structural schematic diagram of the top cover from an upward viewing angle in one embodiment of the CT scanner of this application;

[0028] Figure 4 This is a schematic diagram of the perforated plate in one embodiment of the CT scanner of this application.

[0029] Explanation of icon numbers:

[0030] 10. CT scanner; 11. Housing; 111. Base frame; 112. Top cover; 1121. Heat dissipation vent; 12. Scanning body; 20. Noise reduction structure; 210. First reinforcing rib; 220. Sound-absorbing component; 230. Noise reduction cavity; 30. Perforated plate; 310. Perforation; 320. Second reinforcing rib.

[0031] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0033] Where the following description relates to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0034] In the description of this application, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, in the description of this application, unless otherwise stated, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0036] CT scanners have complex internal structures and generate significant overall noise, primarily from the cooling fans of various components. This leads to a poor experience and lack of comfort for both patients and doctors. While some technologies aim to reduce noise by optimizing the sound source, such as optimizing the fan to produce less noise, these methods are limited. Adjusting the fan structure and performance parameters may degrade fan performance, affecting its normal operation and effectiveness, while still leaving considerable noise.

[0037] This application proposes a CT scanner that reduces noise along the transmission path by setting an acoustic shielding structure inside the CT scanner housing. This reduces the noise transmitted to the outside of the CT scanner, making the noise felt by patients and doctors less during the scanning process, thus improving the experience and comfort of patients and doctors.

[0038] Please see Figure 1 and Figure 2 In this embodiment, the CT scanner 10 includes a housing 11, a scanning body 12, and a noise reduction structure 20; the scanning body 12 is disposed inside the housing 11; the noise reduction structure 20 is disposed inside the housing 11; wherein, the noise reduction structure 20 includes a first reinforcing rib 210, the first reinforcing rib 210 is connected to the housing 11, and together with the housing 11, forms a plurality of noise reduction cavities 230 with openings facing the scanning body 12.

[0039] By providing a first reinforcing rib 210 on the inner side of the housing 11, the first reinforcing rib 210 and the housing 11 enclose a silencing cavity 230 with its opening facing the scanning body 12. On the one hand, the opening of the silencing cavity 230 faces the scanning body 12, which can better receive the noise generated by the scanning body 12. After the sound wave enters the silencing cavity 230, it is reflected and scattered multiple times through the cavity structure, and the energy gradually attenuates, thus absorbing the noise. On the other hand, the first reinforcing rib 210 is connected to the housing 11, which enhances the structural rigidity of the housing 11 and reduces the secondary noise generated by the vibration of the housing 11, thus achieving the dual effects of active noise reduction and passive sound absorption.

[0040] Specifically, the method by which the first reinforcing rib 210 is connected to the shell 11 is not limited, including but not limited to welding, bonding or hot pressing fusion.

[0041] It should be noted that CT stands for Computed Tomography. The scanning body 12 includes a data acquisition device, a computer and image processing device, and an image display and storage device. The data acquisition device includes an X-ray tube, a detector, a high-voltage generator, and a heat dissipation assembly. The X-ray tube generates X-rays, the detector receives the X-rays and converts them into electrical signals, the high-voltage generator provides stable high-voltage electricity and current to the X-ray tube, and the heat dissipation assembly cools the X-ray tube, detector, and high-voltage generator to prevent overheating damage. The computer and image processing device mainly converts the analog signals output by the detector into digital signals and transmits them to the computer for processing. The image display and storage device provides a human-computer interaction interface for setting scanning parameters, real-time image monitoring, and post-processing such as window width and level adjustment and lesion measurement. Typically, the housing 11 includes a base frame 111, a front cover, a rear cover, and a top cover 112. The front and rear covers are positioned opposite each other on the base frame 111, and the top cover 112 is positioned above the base frame 111 and connected to the front cover, rear cover, and base frame 111. A hollow inner cylinder connects the front and rear covers, and the areas of the front and rear covers corresponding to the inner cylinder are hollowed out to form a scanning chamber for the human body to pass through. X-ray tubes and detectors are located on opposite sides of the inner cylinder along its axis, allowing X-rays generated by one X-ray tube to penetrate the human body inside the scanning chamber and be received by the detector on the other side. The CT scanner 10 typically also includes a scanning bed for the patient to lie on. The scanning bed is placed at the front of the scanning chamber and can move horizontally and vertically to extend into the scanning chamber, ultimately positioning different parts of the patient within the chamber and improving scanning accuracy.

[0042] The heat dissipation assembly includes a cooling fan, and the top cover 112 is provided with a heat dissipation vent 1121 to allow the cooling fan to expel hot air through the heat dissipation vent 1121. Considering that noise will be transmitted from the heat dissipation vent 1121 to the outside of the top cover 112 with the airflow, that is, the noise mainly propagates in the direction of the top cover 112, optionally, in one embodiment, the sound-absorbing structure 20 is provided on the inner side of the top cover 112. By enhancing the sound absorption and noise reduction capability of the inner side of the top cover 112, most of the noise is consumed by the sound-absorbing cavity 230 before it propagates to the heat dissipation vent 1121, reducing the noise transmitted from the heat dissipation vent 1121, and thus reducing the overall noise of the CT machine 10. It is understood that the sound-absorbing structure 20 can also be provided on the inner side of the front cover, rear cover, or even the base frame 111 to improve the overall sound absorption and noise reduction capability of the inner side of the housing 11.

[0043] Furthermore, in one embodiment, the silencing structure 20 further includes a sound-absorbing element 220 disposed within the silencing cavity 230. Specifically, the sound-absorbing element 220 can be polyester fiber cotton, PU sponge, or glass wool, and fills the silencing cavity 230. Taking the sound-absorbing element 220 as an example, PU sponge is a porous polymer material with a porous structure composed of micropores and polyurethane resin pore walls. The porous structure of PU sponge can convert sound energy into heat energy through pore friction and viscosity effects, compensating for the inadequacy of mid-to-high frequency noise absorption by relying solely on cavity reflection and scattering of the silencing cavity 230. This adjusts the inherent absorption frequency of the silencing cavity 230, expands the noise absorption frequency band, and enables the sound-absorbing unit to absorb noise in the 500Hz to 4000Hz frequency band. At the same time, during the reflection and scattering of noise within the silencing cavity 230, the propagation path of sound waves within the sound-absorbing element 220 is increased, improving the noise absorption efficiency of the sound-absorbing element 220. The silencing structure 20 forms multiple silencing cavities 230 inside the housing 11, dividing the space inside the housing 11. The sound-absorbing component 220 can reduce sound wave reflection within the silencing cavity 230, avoiding standing waves and reverberation caused by the silencing cavity 230 being empty, and preventing secondary amplification of noise. The sound-absorbing component 220 can be fixed inside the silencing cavity 230 by adhesive bonding. After filling the silencing cavity 230, the sound-absorbing component 220 can also buffer external impact forces, reducing the risk of damage to internal components of the CT machine 10 during handling or accidental collisions.

[0044] Please see Figure 2 and Figure 3 In one embodiment, the opening of the silencing cavity 230 is arranged in the form of an equilateral polygon, and the plurality of silencing cavities 230 are arranged in an array.

[0045] It is understandable that when the opening of the silencing cavity 230 is arranged in an equilateral polygon and multiple silencing cavities 230 are arranged in an array, that is, when the first reinforcing rib 210 encloses the shell 11 to form a regular polygon, the adjacent boundaries of two adjacent silencing cavities 230 can be formed by the same first reinforcing rib 210, that is, the same first reinforcing rib 210 can serve as the same sidewall of two adjacent silencing cavities 230. By designing the shared boundary of adjacent silencing cavities 230, the number of silencing cavities 230 within the same area can be maximized. With the size of the silencing cavity 230 itself remaining unchanged, the more silencing cavities 230 there are, the larger the area for receiving sound waves, and the better the effect of splitting sound waves, which can enhance the sound absorption and noise reduction capability of the inner side of the shell 11. The first reinforcing rib 210 with the shared boundary of adjacent silencing cavities 230 can reduce redundant structures, reduce the weight of the first reinforcing rib 210 while ensuring the same number of silencing cavities 230 and the supporting strength of the first reinforcing rib 210 for the shell 11, and reduce production costs. Meanwhile, the shared boundary design of adjacent anechoic cavities 230 causes phase interference of sound waves between them, which can cancel out noise at specific frequencies. It should be noted that multiple anechoic cavities 230 can be formed by repeatedly bending a first reinforcing rib 210 on the housing 11, or by connecting multiple first reinforcing ribs 210 together on the housing 11. Of course, the opening shape of the anechoic cavity 230 can also be set to other shapes besides regular polygons, such as circles, parallelograms, or sectors.

[0046] Specifically, in one embodiment, the opening shape of the anechoic cavity 230 is a regular hexagon. It can be understood that when multiple anechoic cavities 230 with hexagonal openings are arranged in a close array, each side of a single anechoic cavity 230 can share a boundary with another anechoic cavity 230. That is, six other anechoic cavities 230 can be closely arranged around the central anechoic cavity 230. The multiple anechoic cavities 230 are arranged in a honeycomb structure with no gaps between them, maximizing the number of anechoic cavities 230 per unit area. This increases the range of sound waves received by the anechoic cavities 230 and increases the frequency of collisions between the sound waves and the first reinforcing ribs 210 after entering the anechoic cavity 230, ensuring attenuation of sound wave energy. In a single anechoic cavity 230, the included angle formed by the first reinforcing ribs 210 on two adjacent sidewalls is 120°, making the direction of sound wave reflection on different first reinforcing ribs 210 random, avoiding energy concentration after sound wave reflection and preventing it from being difficult to disperse. A single hexagonal silencing cavity 230 can be formed by bending a first reinforcing rib 210 five times on the housing 11 and then connecting its ends together. Optionally, to improve the installation efficiency of the first reinforcing rib 210 on the housing 11, the first reinforcing rib 210 that encloses the boundaries of multiple silencing cavities 230 can be formed as a unit, with each unit formed in one step in a corresponding mold, and then the formed first reinforcing rib 210 is connected to the housing 11.

[0047] Optionally, the side length of the hexagonal opening of the silencing cavity 230 is L, where 10mm ≤ L ≤ 150mm. Limiting L ≥ 10mm can prevent local buckling of the first reinforcing rib 210 due to its increased slenderness ratio when the side length is too small; while limiting L ≤ 150mm can prevent the side length from being too large and reducing the overall rigidity of the shell 11 and the first reinforcing rib 210.

[0048] Please see Figure 2 and Figure 4 In one embodiment, the CT scanner 10 further includes a perforated plate 30, which is disposed at the opening of the anechoic chamber 230. The perforated plate 30 has multiple through-holes 310, and the anechoic chamber 230 communicates with at least one through-hole 310. By setting the perforated plate 30, a sandwich structure is formed between the housing 11 and the perforated plate 30, and the through-holes 310 on the perforated plate 30 and the anechoic chamber 230 communicating with the through-holes 310 form a resonant cavity. When the incident sound wave enters the anechoic chamber 230 through the through-holes 310, the air column in the through-holes 310 vibrates, causing elastic deformation of the air in the anechoic chamber 230. The two form a "mass-spring" system, which resonates at a specific frequency (resonance frequency). During resonance, the sound wave energy is converted into the kinetic energy of air vibration and the heat energy generated by the friction between the air, thereby achieving the attenuation of the sound wave at a specific frequency.

[0049] It is understandable that multiple perforations 310 are evenly arranged on the perforated plate 30 to balance the structural strength of the perforated plate 30 itself. Specifically, multiple perforations 310 are evenly spaced along the length of the perforated plate 30 and also evenly spaced along the width of the perforated plate 30.

[0050] Specifically, the perforated plate 30 can be connected to the first reinforcing rib 210 or to the housing 11, thereby achieving fixation at the opening of the silencing cavity 230. The method by which the perforated plate 30 is connected to the first reinforcing rib 210 or the housing 11 is not limited, including but not limited to screw connection, bonding, thermoforming, snap-fitting, or welding. The material of the perforated plate 30 can be metal or plastic.

[0051] It should be noted that the resonant frequency is affected by the diameter of the perforation 310, the spacing between the perforations 310, the thickness of the perforated plate 30, and the depth of the silencing cavity 230. The formula for the resonant frequency is: Where f is the resonant frequency, c is the speed of sound, P is the porosity of the perforated plate 30, V is the volume of the silencing cavity 230, and t is the thickness of the perforated plate 30. The porosity P of the perforated plate 30 can be adjusted by changing the aperture and spacing of the perforations 310; the volume V of the silencing cavity 230 can be adjusted by changing the depth and opening size of the silencing cavity 230, ultimately achieving the adjustment of the resonant frequency f, i.e., realizing the absorption of sound waves of a specific frequency by the resonant cavity. Optionally, the aperture of the perforation 310 is D, the depth of the silencing cavity 230 is H, 0.5mm≤D≤2mm, 10mm≤H≤50mm; and the porosity of the perforated plate 30 is P%, 15≤P≤25%.

[0052] By controlling the porosity of the perforated plate 30 between 15% and 25%, the sound absorption effect of the perforated plate 30 and the anechoic cavity 230 can be avoided if the porosity of the perforated plate 30 is too low; at the same time, the structural strength of the perforated plate 30 itself can be avoided if the porosity of the perforated plate 30 is too high. Furthermore, by matching the aperture of the perforation 310 with the depth of the anechoic cavity 230, the resonant cavity formed by the anechoic cavity 230 and the perforation 310 primarily absorbs low-frequency noise between 100Hz and 800Hz, complementing the absorption of mid-to-high-frequency noise by the anechoic cavity 230 and the sound-absorbing component 220. This allows the sandwich structure formed by the shell 11 and the perforated plate 30 to cover and absorb noise in the 100Hz to 4000Hz frequency range. Meanwhile, the side length L of the regular hexagon directly affects the geometric dimensions of the silencing cavity 230. By limiting L to 10mm-150mm, it is ensured that the resonant frequency of the silencing cavity 230 covers the main noise frequency band of the CT machine 10.

[0053] It is understandable that the shell 11, the first reinforcing rib 210, and the perforated plate 30, due to their rigid structures, inherently possess the ability to block sound wave propagation. Furthermore, the thicker the corresponding structure, the better the sound wave blocking effect. However, this would correspondingly increase the mass and volume of the CT scanner 10. Therefore, optionally, the total thickness of the sandwich structure formed by the shell 11 and the perforated plate 30 is set to 50mm-100mm, balancing sound insulation and strength while avoiding excessive overall mass and volume of the CT scanner 10. As mentioned above, the thickness t of the perforated plate 30 also affects the resonant frequency f of the resonant cavity. The thickness t of the perforated plate 30 can be adjusted accordingly, considering the resonant cavity's primary target of absorbing low-frequency noise between 100Hz and 800Hz, and the range of the total thickness of the sandwich structure formed by the shell 11 and the perforated plate 30.

[0054] Please continue reading. Figure 2 and Figure 4Optionally, in one embodiment, the perforated plate 30 has multiple second reinforcing ribs 320 on the side opposite to the first reinforcing rib 210. These second reinforcing ribs 320 are spaced apart in both the length and width directions of the perforated plate 30. Specifically, the second reinforcing ribs 320 can be arranged laterally or vertically. Multiple vertically arranged second reinforcing ribs 320 are spaced apart in the length direction of the perforated plate 30, while multiple laterally arranged second reinforcing ribs 320 are spaced apart in the width direction of the perforated plate 30. By providing the second reinforcing ribs 320, the structural strength of the perforated plate 30 is enhanced, and the noise generated by the perforated plate 30 due to its own vibration is reduced.

[0055] In another embodiment, the perforated plate 30 has a noise-absorbing structure on the side facing away from the scanning body 12. The noise-absorbing structure includes a third reinforcing rib, which connects to the perforated plate 30 and, together with the perforated plate 30 and the housing 11, forms a plurality of sealed noise-absorbing cavities. Each noise-absorbing cavity communicates with at least one perforation 310. In this case, the two ends of the third reinforcing rib can be fixedly connected to the perforated plate 30 and the housing 11 respectively, or one end can be fixedly connected to the perforated plate 30 and the other end can abut against the housing 11 to achieve a sealed effect for the noise-absorbing cavities. The openings of the noise-absorbing cavities are arranged in an equilateral polygonal pattern, and the plurality of noise-absorbing cavities are distributed in an equilateral polygonal array on the perforated plate 30. The adjacent boundaries of two adjacent noise-absorbing cavities can be formed by the same third reinforcing rib, that is, the same third reinforcing rib can serve as the same sidewall of two adjacent noise-absorbing cavities.

[0056] By setting a third reinforcing rib, the third reinforcing rib not only improves the structural strength of the perforated plate 30 itself, but also forms a sealed anechoic cavity with the shell 11 and the perforated plate 30. The anechoic cavity is connected to at least one perforation 310, so that the perforation 310 on the perforated plate 30 and the anechoic cavity connected to the perforation 310 form a resonant cavity. When the incident sound wave enters the anechoic cavity through the perforation 310, the air column in the perforation 310 vibrates, causing elastic deformation of the air in the anechoic cavity. The two form a "mass-spring" system, which resonates at a specific frequency (resonance frequency). During resonance, the sound wave energy is converted into the kinetic energy of air vibration and the heat energy generated by the friction between the air, thereby achieving the attenuation of the sound wave at a specific frequency. Similarly, by adjusting the porosity of the perforated plate 30, the thickness of the perforated plate 30, or the volume of the anechoic cavity, the resonant frequency can be adjusted, that is, the absorption of the sound wave at a specific frequency can be achieved by the resonant cavity.

[0057] It is understandable that, in addition to the first reinforcing rib 210 provided on the inner side of the housing 11, a third reinforcing rib can also be provided on the side of the perforated plate 30 facing away from the scanning body 12. In this case, the first reinforcing rib 210 and the third reinforcing rib are aligned so that the perforated plate 30, the housing 11, the first reinforcing rib 210, and the third reinforcing rib together enclose and form multiple sealed silencing cavities. Similarly, the silencing cavity is connected to at least one perforation 310, so that the perforation 310 on the perforated plate 30 and the silencing cavity connected to the perforation 310 form a resonant cavity.

[0058] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this application. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0059] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A CT scanner, characterized in that, include: case; The scanning body is housed within the casing. as well as A noise-absorbing structure is provided inside the housing; The noise reduction structure includes a first reinforcing rib, which is connected to the housing and together with the housing forms a plurality of noise reduction cavities with openings facing the scanning body.

2. The CT scanner as described in claim 1, characterized in that, Also includes: A perforated plate is disposed at the opening of the silencing cavity. The perforated plate has multiple through holes, and the silencing cavity is connected to at least one of the through holes.

3. The CT scanner as described in claim 2, characterized in that, The diameter of the perforation is D, and the depth of the silencing cavity is H, wherein 0.5mm≤D≤2mm and 10mm≤H≤50mm.

4. The CT scanner as described in claim 3, characterized in that, The porosity of the perforated plate is P%, where 15 ≤ P ≤ 25.

5. The CT scanner as described in claim 2, characterized in that, The perforated plate has multiple second reinforcing ribs on the side opposite to the first reinforcing rib, and the multiple second reinforcing ribs are spaced apart in the length and width directions of the perforated plate.

6. The CT scanner as described in claim 1, characterized in that, The opening of the silencing cavity is arranged in the shape of an equilateral polygon, and multiple silencing cavities are distributed in an array.

7. The CT scanner as described in claim 6, characterized in that, The opening shape of the silencing cavity is a regular hexagon with a side length of L, wherein 10mm≤L≤150mm.

8. The CT scanner as described in any one of claims 1 to 7, characterized in that, The noise reduction structure also includes a sound-absorbing component, which is disposed inside the noise reduction cavity.

9. The CT scanner as described in claim 8, characterized in that, The sound-absorbing component includes polyester fiber cotton, PU sponge, or glass wool, and the sound-absorbing component fills the sound-absorbing cavity.

10. The CT scanner as described in claim 1, characterized in that, The housing includes: Base frame; The front cover and the rear cover are mounted opposite each other on the base frame; and A top cover is disposed above the base frame and is connected to the front cover, the rear cover and the base frame; The scanning body includes a heat dissipation component, the top cover is provided with a heat dissipation vent, and the noise reduction structure is provided at least inside the top cover.

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