A low-dose cold cathode imaging device

Abstract

The present invention relates to the technical field of CT imaging devices, and in particular to a low-dose cold cathode imaging device, comprising: a housing; an imaging unit; a power supply unit; a detection unit; and a control unit for determining an X-ray excitation moment based on the distance between a cold cathode X-ray tube assembly and an object to be imaged, determining an excitation voltage of the cold cathode X-ray tube assembly at the excitation moment based on the air temperature surrounding the cold cathode X-ray tube assembly within the housing, and determining a corresponding adjustment method based on the distribution conditions of characteristic nodes of a scanned image, including screening using different time intervals or training and restoring the scanned image. The present invention achieves enhanced scanning effects and optimized scanned images.

Description

Technical Field

[0001] The present invention relates to the technical field of imaging devices, and in particular to a low-dose cold cathode imaging device. Background Art

[0002] In the existing technology, low-dose cold cathode imaging devices use cold cathode emitters instead of traditional hot cathode emitters, which can generate X-rays at a lower voltage, thereby reducing the radiation dose and reducing the size of the imaging device, making it easy to carry. Cold cathode X-ray tubes use carbon nanotubes or other high-conductivity materials as cathodes, which can emit electrons without heating. Compared with hot cathode X-ray tubes, cold cathode X-ray tubes can start instantly and do not require preheating time. Due to precise pulse control and low power consumption, cold cathode X-ray tubes can reduce radiation dose and reduce harm to the human body. Some advanced cold cathode X-ray tube technologies can achieve multi-focus distributed emission, resulting in better imaging effects.

[0003] Chinese Patent Publication No. CN111839572A discloses a CT imaging system and imaging method thereof, comprising a cold cathode X-ray source, a probe, a control device, a rotation device, an imaging device, and a processor. The cold cathode X-ray source and probe are electrically connected to the control device, and the processor is electrically connected to the imaging device. The cold cathode X-ray source is used to generate X-rays for CT imaging, the rotation device is used to control the scanning angle of the scanned object, the probe is used to obtain physiological signals of the scanned object at different scanning angles, the control device is used to trigger the activation of the cold cathode X-ray source based on the physiological signals of the scanned object at different scanning angles, the imaging device is used to collect projection images of the X-rays passing through the scanned object at different scanning angles, and the processor is used to reconstruct the projection images to obtain a CT image of the scanned object. Therefore, the CT imaging system and imaging method thereof have the following problems: the device is large and inconvenient to carry; the device has insufficient anti-collision rating, making it incompatible with harsh detection environments; small-volume X-ray scanning results in poor scanning quality; and the scanned image is not highly optimized. Summary of the Invention

[0004] To this end, the present invention provides a low-dose cold cathode imaging device to overcome the problems in the prior art such as the large size of the device making it inconvenient to carry, the insufficient anti-collision level of the device making it unable to adapt to harsh detection environments, the small volume X-ray scanning resulting in poor scanning effects, and the low degree of optimization of the scanned image.

[0005] To achieve the above object, the present invention provides a low-dose cold cathode imaging device, comprising:

[0006] shell;

[0007] An imaging unit for scanning and imaging a human body, comprising a cold cathode X-ray tube assembly for emitting X-rays, a digital imaging plate for absorbing the X-rays and converting them into electrical signals, and an image processor connected to the digital imaging plate for generating a scanned image based on the electrical signals;

[0008] a power supply unit connected to the imaging unit for providing the voltage and current required for the scanning imaging process, including a high-voltage driver connected to the cold cathode X-ray tube assembly for amplifying the excitation voltage of the cold cathode X-ray tube assembly;

[0009] a detection unit, connected to the housing and the power supply unit, respectively, for detecting in real time the closest distance between the cold cathode X-ray tube assembly and the object to be imaged and the air temperature surrounding the cold cathode X-ray tube assembly in the housing;

[0010] a control unit, which is respectively connected to the imaging unit, the power supply unit and the detection unit, and is used to determine the excitation moment of the X-ray according to the distance between the cold cathode X-ray tube assembly and the object to be imaged, determine the excitation voltage of the cold cathode X-ray tube assembly at the excitation moment according to the air temperature around the cold cathode X-ray tube assembly in the housing, and determine the corresponding adjustment method according to the distribution conditions of the characteristic nodes of the scanned image, including using different time intervals for screening or training and restoration processing of the scanned image.

[0011] Furthermore, the shell is provided with a grab handle for providing a grabbing position; the empty space inside the shell is filled with insulating gas.

[0012] Furthermore, the image processor includes a training component for training the scanned image.

[0013] Furthermore, the detection unit includes:

[0014] a distance detection assembly, disposed on the outer wall of the second housing, for detecting in real time the closest distance between the cold cathode X-ray tube assembly and the object to be imaged;

[0015] A temperature sensor is connected to the inner wall of the shell and is used to detect the air temperature around the cold cathode X-ray tube assembly in the shell.

[0016] Furthermore, the control unit is respectively connected to the cold cathode X-ray tube assembly and the distance detection assembly to obtain the distance between the cold cathode X-ray tube assembly and the imaged object detected in real time by the distance detection assembly, and determines the moment corresponding to the minimum distance among several detection moments occurring in a single detection cycle as the excitation moment of the X-ray.

[0017] Furthermore, the control unit is respectively connected to the high-voltage driver and the temperature sensor to obtain the air temperature around the cold cathode X-ray tube assembly in the housing. When the air temperature around the cold cathode X-ray tube assembly in the housing is greater than a preset temperature, it is determined that the X-ray emission intensity does not meet the requirements, and the excitation voltage of the cold cathode X-ray tube assembly at the excitation moment is increased.

[0018] Furthermore, the increase amplitude of the excitation voltage at the excitation moment of the cold cathode X-ray tube assembly is determined according to the difference between the air temperature around the cold cathode X-ray tube assembly in the housing and the preset temperature.

[0019] Furthermore, the control unit is connected to the image processor to obtain the characteristic nodes of the scanned image and calculate the distribution area of ​​the characteristic nodes of the scanned image in the scanned image. When the distribution area satisfies a first distribution condition, the corresponding adjustment method is determined to be the screening using different time intervals. When the distribution area satisfies a second distribution condition, the corresponding adjustment method is determined to be the training and restoration processing of the scanned image.

[0020] The first distribution condition is that the distribution area is larger than a preset area, and the second distribution condition is that the distribution area is smaller than or equal to the preset area.

[0021] Furthermore, the control unit is connected to the image processor to obtain the image clarity within the distribution area when the distribution area satisfies the first distribution condition or the second distribution condition, and when the image clarity within the distribution area is less than a preset clarity, increase the division density of the different time intervals or increase the training frequency of the training restoration processing of the scanned image.

[0022] Furthermore, the increase range of the division density of the different time intervals or the increase range of the training frequency of the training restoration processing of the scanned image is determined according to the difference between the preset clarity and the image clarity within the distribution area.

[0023] Compared with the prior art, the present invention has the following advantages: the device of the present invention is provided with an imaging unit, a power supply unit, a housing, a detection unit, and a control unit. By providing a cold cathode X-ray tube assembly and a digital imaging board in the imaging unit, the low-dose cold cathode X-ray tube can reduce the radiation dose received by the human body while ensuring image quality, reducing the size and weight of the device and making it easy to carry because it is adapted to battlefield environments; the power supply unit is provided to provide a high voltage to the cold cathode X-ray tube, which can reduce energy loss and improve control accuracy, thereby increasing the penetration of X-rays and improving scanning effects; the detection unit is provided to optimize excitation conditions, thereby reducing the reduction in scanning effects and scanning sensitivity caused by environmental instability in special scenarios such as field battlefields; the excitation time and excitation voltage are set to improve the efficiency of X-ray generation, thereby improving the sensitivity of detection and increasing the specificity of the generated characteristic X-ray spectrum, thereby improving the scanning effect; and the adjustment method is set according to the characteristic nodes of the scanned image to optimize the image, improve the image clarity and resolution, and focus on optimizing the characteristic node cloud to improve detection efficiency and improve the optimization degree of the scanned image.

[0024] Furthermore, the device described in the present invention protects the internal X-ray tube by providing an outer shell. Due to the high vibration intensity and high probability of impact in the environment, the anti-collision and heat dissipation mechanical properties of the first outer shell are improved to adapt to the harsh detection environment. By improving the conduction performance of the second outer shell, the image quality can be optimized and the conduction efficiency of the X-rays can be improved, thereby reducing the required radiation dose, further improving the anti-collision level of the device and improving the scanning effect.

[0025] Furthermore, the device of the present invention detects the scanning distance by setting a distance detection component, determines the human breathing rhythm and then determines the node when the human inhalation is maximum, which is the minimum distance between the human body surface and the cold cathode X-ray tube assembly, thereby improving the clarity of the scanned image. For patients in a coma who cannot clearly determine the breathing rhythm, the excitation moment can be determined by obtaining the scanning distance, thereby improving the image accuracy; by setting a preset temperature, when the outer shell is dented by an impact or the heat dissipation is poor inside, the excitation voltage of the X-ray decreases, thereby causing the imaging effect to decrease. By increasing the excitation voltage, the scanning effect is improved.

[0026] Furthermore, the device described in the present invention determines the distribution conditions of the feature nodes of the scanned image by setting a preset area and then determines the adjustment method. Since the dispersion degree of the feature nodes in the scanned image is low, the image clarity near the feature nodes is reduced, and the scanned image is then trained and restored. Since the dispersion degree of the feature nodes in the scanned image is high, the image clarity near different feature nodes is different, and different time intervals are used for screening, thereby improving the image clarity and the degree of optimization of the scanned image. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the overall structure of a low-dose cold cathode imaging device according to an embodiment of the present invention;

[0028] Figure 2 A schematic structural diagram of a low-dose cold cathode imaging device according to an embodiment of the present invention from another angle;

[0029] Figure 3 This is a block diagram of the overall structure of a low-dose cold cathode imaging device according to an embodiment of the present invention;

[0030] Figure 4 This is a block diagram of the specific structure of the detection unit of the low-dose cold cathode imaging device according to an embodiment of the present invention;

[0031] Figure 5 This is a specific structural block diagram of the detection unit and the control unit of the low-dose cold cathode imaging device according to an embodiment of the present invention.

[0032] Explanation of the reference numerals: 1-grabbing handle, 2-temperature sensor, 3-first housing, 4-high-voltage driver, 5-cold cathode X-ray tube assembly, 6-second housing, 7-first infrared sensor, 8-digital imaging board, 9-image processor, 10-object to be imaged, 11-second infrared sensor, 12-third infrared sensor, 13-fourth infrared sensor. DETAILED DESCRIPTION

[0033] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are merely used to explain the present invention and are not intended to limit the present invention.

[0034] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0035] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside", and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0036] Furthermore, it should be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0037] See also Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 as well as Figure 5 As shown in the figure, there are respectively a schematic diagram of the overall structure of the low-dose cold cathode imaging device according to an embodiment of the present invention, a schematic diagram of the structure from another angle, a block diagram of the overall structure, a block diagram of the specific structure of the detection unit, and a block diagram of the specific structure of the detection unit and the control unit. A low-dose cold cathode imaging device according to the present invention comprises:

[0038] shell;

[0039] An imaging unit for scanning and imaging a human body, comprising a cold cathode X-ray tube assembly 5 for emitting X-rays, a digital imaging board 8 for absorbing the X-rays and converting them into electrical signals, and an image processor 9 connected to the digital imaging board 8 for generating a scanned image based on the electrical signals;

[0040] a power supply unit connected to the imaging unit for providing the voltage and current required for the scanning imaging process, including a high-voltage driver 4 connected to the cold cathode X-ray tube assembly 5 for amplifying the excitation voltage of the cold cathode X-ray tube assembly 5;

[0041] a detection unit, which is connected to the housing and the power supply unit respectively, and is used to detect in real time the closest distance between the cold cathode X-ray tube assembly 5 and the object to be imaged 10 and the air temperature around the cold cathode X-ray tube assembly 5 in the housing;

[0042] a control unit, which is respectively connected to the imaging unit, the power supply unit, and the detection unit, and is used to determine the excitation moment of the X-ray according to the distance between the cold cathode X-ray tube assembly 5 and the object to be imaged 10, determine the excitation voltage of the cold cathode X-ray tube assembly 5 at the excitation moment according to the air temperature around the cold cathode X-ray tube assembly 5 in the housing, and determine the corresponding adjustment method according to the distribution conditions of the characteristic nodes of the scanned image, including using different time intervals for screening or training and restoration processing of the scanned image.

[0043] Specifically, the cold cathode X-ray tube uses carbon nanotubes as the cathode material.

[0044] Specifically, during the manufacturing process, the cold cathode X-ray tube uses a combined air extraction method of mechanical pump pre-pumping, diffusion pump pressure reduction and ion pump high vacuum exhaust to improve the vacuum degree inside the tube, and adopts vacuum welding and ceramic packaging.

[0045] Specifically, the cold cathode X-ray tube assembly 5 includes a number of evenly distributed cold cathode X-ray tubes. The preferred area of ​​the cold cathode X-ray tube assembly 5 is 800 cm 2 .

[0046] Specifically, the uniform distribution of the cold cathode X-ray tubes means that the distance between each cold cathode X-ray tube and the adjacent cold cathode X-ray tubes is equal.

[0047] Specifically, the digital imaging plate 8 is a high-resolution digital imaging plate 8 with an imaging spatial resolution of ≤2 mm.

[0048] Specifically, the power supply unit further includes a driving power supply connected to the high-voltage driver 4 for supplying power to the cold cathode X-ray tube assembly 5 .

[0049] Specifically, the device of the present invention uses a portable lithium battery as a driving power source.

[0050] Specifically, the output voltage range of the power supply unit is [100KV, 120KV].

[0051] Specifically, the scanned image feature nodes include lesion area density block feature nodes, lesion internal structure area feature nodes, and lesion periphery feature nodes.

[0052] Specifically, the density block feature nodes of the lesion area include low-density, equal-density, and high-density block shadows; the feature nodes of the internal structure area of ​​the lesion include necrosis, cystic change, hemorrhage, and calcification areas; the feature nodes around the lesion include edema, inflammatory reaction, and fibrosis areas.

[0053] Specifically, the object to be imaged 10 is a part of the human body that needs to be scanned and imaged.

[0054] In practice, the device of the present invention comprises an imaging unit, a power supply unit, a housing, a detection unit, and a control unit. The cold cathode X-ray tube assembly 5 and the digital imaging board 8 in the imaging unit are provided. Due to their adaptability to battlefield environments, the low-dose cold cathode X-ray tube can reduce the radiation dose received by the human body while ensuring image quality, thereby reducing the size and weight of the device and making it easy to carry. The power supply unit is provided to provide a high voltage to the cold cathode X-ray tube, thereby reducing energy loss and improving control accuracy, thereby increasing the penetration of X-rays and achieving improved scanning effects. The detection unit is provided to optimize excitation conditions, thereby reducing the reduction in scanning effects and scanning sensitivity caused by environmental instability in special scenarios such as field battlefields. The excitation time and excitation voltage are set to increase the efficiency of X-ray generation, thereby increasing the sensitivity of detection and enhancing the specificity of the generated characteristic X-ray spectrum, thereby achieving improved scanning effects. By determining corresponding adjustment modes based on characteristic nodes of the scanned image, the image is optimized to improve image clarity and resolution. The characteristic node cloud is optimized to improve detection efficiency and the degree of optimization of the scanned image.

[0055] Specifically, the housing is provided with a gripping handle 1 for providing a gripping position; the empty space inside the housing is filled with insulating gas.

[0056] Specifically, the shell includes a first shell 3 connected to the power supply unit to protect the power supply unit and the cold cathode X-ray tube assembly 5, and a second shell 6 connected to the first shell 3 and the cold cathode X-ray tube assembly 5 respectively to protect the cold cathode X-ray tube assembly 5 and transmit X-rays. The second shell 6 is rectangular in shape.

[0057] Specifically, the material of the shell and the material of the grab handle 1 can be selected from lightweight and high-strength materials such as aviation aluminum, silicon carbide, carbon fiber reinforced plastic, and polymer materials. The material of the second shell 6 can be selected from beryllium, diamond, graphitized carbon, and polyimide.

[0058] In practice, the insulating gas may be sulfur hexafluoride, nitrogen, carbon dioxide, heptafluoroisobutyronitrile, or perfluoro-3-methyl-2-butanone.

[0059] Preferably, the insulating gas is a mixed gas of perfluoro-3-methyl-2-butanone and carbon dioxide.

[0060] In practice, the device of the present invention protects the internal X-ray tube by providing an outer shell. Due to the high vibration intensity and high probability of collision in the environment, the anti-collision and heat dissipation mechanical properties of the first outer shell 3 are improved to adapt to the harsh detection environment. By improving the conduction performance of the second outer shell 6, the image quality can be optimized and the conduction efficiency of the X-ray can be improved, thereby reducing the required radiation dose, further improving the anti-collision level of the device and improving the scanning effect.

[0061] Specifically, the detection unit includes:

[0062] a distance detection component, which is arranged on the outer wall of the second housing 6 and is used to detect the minimum distance between the cold cathode X-ray tube assembly 5 and the object to be imaged 10 in real time;

[0063] The temperature sensor 2 is connected to the inner wall of the housing and is used to detect the air temperature around the cold cathode X-ray tube assembly 5 in the housing.

[0064] Specifically, the distance detection component includes a first infrared sensor 7 , a second infrared sensor 11 , a third infrared sensor 12 and a fourth infrared sensor 13 connected to the second housing.

[0065] Specifically, the four infrared sensors are evenly distributed at the four corners near the outer edge of the second housing 6 .

[0066] Specifically, the control unit is connected to the cold cathode X-ray tube assembly 5 and the distance detection assembly, respectively, to obtain the distance between the cold cathode X-ray tube assembly 5 and the imaged object 10 detected in real time by the distance detection assembly, and determine the moment corresponding to the minimum distance among several detection moments occurring in a single detection cycle as the excitation moment of the X-ray.

[0067] Specifically, the control unit is connected to the high-voltage driver 4 and the temperature sensor 2, respectively, to obtain the air temperature around the cold cathode X-ray tube assembly 5 in the housing. When the air temperature around the cold cathode X-ray tube assembly 5 in the housing is greater than a preset temperature, it is determined that the X-ray emission intensity does not meet the requirements, and the excitation voltage of the cold cathode X-ray tube assembly 5 at the excitation moment is increased.

[0068] Specifically, the increase amplitude of the excitation voltage at the excitation moment of the cold cathode X-ray tube assembly 5 is determined according to the difference between the air temperature around the cold cathode X-ray tube assembly 5 in the housing and the preset temperature.

[0069] Specifically, the excitation voltage at the time of excitation of X-rays is adjusted by the power supply unit.

[0070] In practice, the preset temperature generally ranges from [40°C to 60°C].

[0071] Preferably, the preset temperature is 50°C.

[0072] Specifically, when the difference between the air temperature around the cold cathode X-ray tube assembly 5 in the shell and the preset temperature is within 2°C, the excitation voltage at the time of X-ray excitation increases to 1.05 times the original value; when the difference between the air temperature around the cold cathode X-ray tube assembly 5 in the shell and the preset temperature exceeds 2°C, the excitation voltage at the time of X-ray excitation increases by 0.2KV for every 1°C exceeding. For example, when the air temperature around the cold cathode X-ray tube assembly 5 in the shell is 54°C, the excitation voltage at the time of X-ray excitation is 108KV, and the excitation voltage at the time of X-ray excitation increases to 108KV×1.05+0.2KV×2=113.8KV.

[0073] In practice, the device of the present invention detects the scanning distance by setting a distance detection component, determines the human breathing rhythm and then determines the node when the human inhalation is maximum, which is the minimum distance between the human body surface and the cold cathode X-ray tube assembly 5, which can improve the clarity of the scanned image. For patients in a coma who cannot clearly determine the breathing rhythm, the excitation moment can be determined by obtaining the scanning distance, thereby improving the image accuracy; by setting a preset temperature, when the outer shell is impacted and dented or the heat dissipation inside is poor, the excitation voltage of the X-ray decreases, thereby causing the imaging effect to decrease. By increasing the excitation voltage, the scanning effect is improved.

[0074] Specifically, the control unit is connected to the image processor 9 to obtain the characteristic nodes of the scanned image and calculate the distribution area of ​​the characteristic nodes of the scanned image in the scanned image. When the distribution area meets the first distribution condition, the corresponding adjustment method is determined to be the screening using different time intervals. When the distribution area meets the second distribution condition, the corresponding adjustment method is determined to be the training and restoration processing of the scanned image.

[0075] The first distribution condition is that the distribution area is larger than a preset area, and the second distribution condition is that the distribution area is smaller than or equal to the preset area.

[0076] Specifically, the distribution area of ​​feature points reflects the spatial occupancy of feature points in the scanned image. When feature points are densely distributed in a certain area, their distribution area is relatively small. When feature points are more dispersed, their distribution area is relatively large.

[0077] In practice, the default area is generally in the range of [48cm 2 , 54cm 2 ].

[0078] Preferably, the preferred embodiment of the preset area is 50cm2 .

[0079] Specifically, the control unit is connected to the image processor 9 to obtain the image clarity within the distribution area when the distribution area meets the first distribution condition or the second distribution condition. When the image clarity within the distribution area is less than the preset clarity, the division density of the different time intervals is increased or the training frequency of the training restoration processing of the scanned image is increased.

[0080] Specifically, the increase range of the division density of the different time intervals or the increase range of the training frequency of the training restoration processing of the scanned image is determined according to the difference between the preset clarity and the image clarity within the distribution area.

[0081] Specifically, the time interval is evenly divided into time intervals within the scanning time of the cold cathode X-ray tube assembly 5 .

[0082] Specifically, the division density of different time intervals is the number of divided time intervals.

[0083] In practice, the preset definition generally ranges from [0.6 mm, 0.8 mm].

[0084] Preferably, the preferred embodiment of the preset clarity is 0.7 mm.

[0085] Specifically, when the difference between the preset clarity and the image clarity within the distribution area is within 0.05mm, the division density of different time intervals is increased to 5 or the training frequency of scanning images for training and restoration processing is increased to 10 times / second; when the difference between the preset clarity and the image clarity within the distribution area exceeds 0.05mm, the division density of different time intervals is increased by 2 for every 0.02mm exceeding, or the training frequency of scanning images for training and restoration processing is increased by 4 times / second. For example, the image clarity within the distribution area is 0.61mm, the division density of different time intervals is increased to 5 + 2 × 2 = 9, or the training frequency of scanning images for training and restoration processing is increased to 10 times / second + 4 times / second × 2 = 18 times / second.

[0086] During implementation, the device of the present invention determines the distribution conditions of the feature nodes of the scanned image by setting a preset area and then determines the adjustment method. Since the dispersion degree of the feature nodes in the scanned image is low, the image clarity near the feature nodes is reduced, and then the scanned image is trained and restored. Since the dispersion degree of the feature nodes in the scanned image is high, the image clarity near different feature nodes is different, and then different time intervals are used for screening, thereby improving the image clarity and the degree of optimization of the scanned image.

[0087] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

Claims

1. A low-dose cold cathode imaging device, characterized in that: include: shell; An imaging unit for scanning and imaging a human body, comprising a cold cathode X-ray tube assembly for emitting X-rays, a digital imaging plate for absorbing the X-rays and converting them into electrical signals, and an image processor connected to the digital imaging plate for generating a scanned image based on the electrical signals; a power supply unit connected to the imaging unit for providing the voltage and current required for the scanning imaging process, including a high-voltage driver connected to the cold cathode X-ray tube assembly for amplifying the excitation voltage of the cold cathode X-ray tube assembly; a detection unit, connected to the housing and the power supply unit, respectively, for detecting in real time the closest distance between the cold cathode X-ray tube assembly and the object to be imaged and the air temperature surrounding the cold cathode X-ray tube assembly in the housing; a control unit, connected to the imaging unit, the power supply unit, and the detection unit, respectively, for determining an X-ray excitation moment based on a distance between the cold cathode X-ray tube assembly and an object to be imaged, determining an excitation voltage of the cold cathode X-ray tube assembly at the excitation moment based on an air temperature surrounding the cold cathode X-ray tube assembly within the housing, and determining a corresponding adjustment method based on a distribution condition of characteristic nodes of a scanned image, including using different time intervals for screening or performing training and restoration processing on the scanned image, wherein the time intervals are time intervals evenly divided within the scanning time of the cold cathode X-ray tube assembly; The control unit is connected to the image processor and is used to obtain the characteristic nodes of the scanned image and calculate the distribution area of ​​the characteristic nodes of the scanned image in the scanned image. When the distribution area satisfies a first distribution condition, the corresponding adjustment method is determined to be the screening using different time intervals. When the distribution area satisfies a second distribution condition, the corresponding adjustment method is determined to be the training restoration processing of the scanned image. The first distribution condition is that the distribution area is larger than a preset area, and the second distribution condition is that the distribution area is smaller than or equal to the preset area. The control unit is connected to the image processor and is used to obtain the image clarity within the distribution area when the distribution area meets the first distribution condition or the second distribution condition. When the image clarity within the distribution area is less than the preset clarity, the division density of the different time intervals is increased or the training frequency of the training restoration processing of the scanned image is increased.

2. The low-dose cold cathode imaging device according to claim 1, characterized in that: The shell is provided with a grab handle for providing a grabbing position; the empty space inside the shell is filled with insulating gas.

3. The low-dose cold cathode imaging device according to claim 2, characterized in that: The image processor includes a training component for training the scanned image.

4. The low-dose cold cathode imaging device according to claim 3, characterized in that: The detection unit comprises: a distance detection assembly, which is arranged on the outer wall of the second housing and is used to detect the closest distance between the cold cathode X-ray tube assembly and the object to be imaged in real time; A temperature sensor is connected to the inner wall of the shell and is used to detect the air temperature around the cold cathode X-ray tube assembly in the shell.

5. The low-dose cold cathode imaging device according to claim 4, characterized in that: The control unit is connected to the cold cathode X-ray tube assembly and the distance detection assembly respectively, and is used to obtain the distance between the cold cathode X-ray tube assembly and the imaged object detected in real time by the distance detection assembly, and determine the moment corresponding to the minimum distance among several detection moments occurring in a single detection cycle as the excitation moment of the X-ray.

6. The low-dose cold cathode imaging device according to claim 5, characterized in that: The control unit is connected to the high-voltage driver and the temperature sensor respectively to obtain the air temperature around the cold cathode X-ray tube assembly in the housing. When the air temperature around the cold cathode X-ray tube assembly in the housing is greater than a preset temperature, it is determined that the X-ray emission intensity does not meet the requirements and the excitation voltage of the cold cathode X-ray tube assembly at the excitation moment is increased.

7. The low-dose cold cathode imaging device according to claim 6, characterized in that: The increase amplitude of the excitation voltage of the cold cathode X-ray tube assembly at the excitation moment is determined according to the difference between the air temperature around the cold cathode X-ray tube assembly in the housing and the preset temperature.

8. The low-dose cold cathode imaging device according to claim 1, characterized in that: The increase range of the division density of the different time intervals or the increase range of the training frequency of the training restoration processing of the scanned image is determined according to the difference between the preset clarity and the image clarity within the distribution area.

Images