CT (Computed Tomography) equipment for adjusting irradiation measurement according to local weight distribution
By setting up a pressure sensor array in the scanning bed of a CT device, the radiation dose can be optimized based on the pressure distribution data and weight characteristics of the scanned object. This solves the problem that existing CT devices cannot optimize local tomographic radiation dose, thus improving imaging quality and scanning safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NANOVISION MEDICAL TECH (SHANGHAI) CO LTD
- Filing Date
- 2025-06-04
- Publication Date
- 2026-05-26
AI Technical Summary
Existing CT equipment cannot optimize the radiation dose of local tomography based on the local body shape characteristics of the scanned object, resulting in poor image quality.
A pressure sensor array is installed in the scanning bed of the CT equipment. By measuring the pressure distribution data of the scanned object, body shape data and weight distribution characteristics are calculated, the radiation dose of each scanning section is adjusted, and the voltage and current parameters of the radiation source are controlled.
It improves the scanning accuracy and imaging quality of CT equipment, enhances the safety and reliability of scanning, enables real-time monitoring of the movement of the scanned object, and optimizes the radiation dose.
Smart Images
Figure CN224269327U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a CT device that adjusts the radiation dose according to local weight distribution, and belongs to the field of medical device technology. Background Technology
[0002] Computed Tomography (CT) equipment includes scanning equipment, a scanning bed, and a control console. The scanning bed consists of a frame and a bed board; the frame supports the bed board, which can move along the axis of the scanning cavity. The object being scanned is fed into the scanning cavity via the scanning bed, thus achieving medical imaging. After the X-ray source performs a tomographic scan of the human body, the attenuation information of the human body collected by the detector is converted into a digital signal through analog-to-digital conversion. The computer calculates the attenuation coefficient of each pixel and reconstructs the image, displaying the tomographic structure of various parts of the human body.
[0003] Chinese utility model patent ZL 201821018169.X discloses a scanning bed and a medical imaging system for measuring the weight of a scanned object. The scanning bed includes a bed board, a bed frame, and a weighing device. The bed board, located on the bed frame, supports the scanned object; one end of the bed board is close to the scanning frame, and the other end is away from the scanning frame. The weighing device, used to measure the weight of the scanned object, is located inside the bed board, specifically in the area away from the scanning frame. This weighing device is positioned in the non-scanning area of the medical imaging system and does not affect image quality during scanning of the object.
[0004] Similarly, existing technologies adjust and optimize contrast agent dosage and irradiation dose based on the obtained weight and height data (BMI) of the scanned subject. However, because the local body shape characteristics of the scanned subject cannot be known—for example, it is impossible to distinguish between broad shoulders and narrow waist versus large abdomen and narrow shoulders among scanned subjects of the same height and weight—it is impossible to optimize the irradiation dose of local tomography based on the local body shape of the scanned patient. Summary of the Invention
[0005] The technical problem to be solved by this invention is to provide a CT device that adjusts the radiation dose according to the local weight distribution.
[0006] To achieve the above technical objectives, the present invention adopts the following technical solution:
[0007] According to an embodiment of the present invention, a CT device for adjusting radiation dose based on local weight distribution is provided, comprising a scanning bed and a scanning device; wherein...
[0008] The scanning bed includes a bed frame and a bed board; the bed board is slidably connected to the bed frame and can be inserted into and removed from the scanning cavity of the scanning device along the Z direction; the bed frame is designed as a support, lifting and telescopic structure for the bed board;
[0009] The bed board includes a support plate and a sensor layer; the support plate is designed as a support structure for the bed board and is slidably connected to the bed frame;
[0010] The sensor layer includes a base layer, multiple pressure sensors, and a sensor interface; wherein, the base layer is designed as a support and insulation structure for the pressure sensors, the multiple pressure sensors are distributed in an array on the base layer, and each pressure sensor is connected to the sensor interface via a ribbon cable, the ribbon cable being arranged along the base layer.
[0011] Preferably, the thickness of the pressure sensor is no more than 0.1 mm as required by design, and its internal wires are made of non-metallic conductive materials.
[0012] Preferably, the sensor interface is located on the side of the bed board away from the scanning device.
[0013] Preferably, the bed board further includes a position sensor; wherein...
[0014] The position sensor is mounted on the bed board and is designed to obtain position data of the bed board relative to the scanning device; the position sensor is connected to the sensor interface.
[0015] Preferably, the CT equipment further includes a bed control panel; wherein...
[0016] The sensor interface is connected to the bed control board; the bed control board is designed to acquire the data measured by the pressure sensor through ADC, acquire the weight AD value through DMA, and calculate the weight distribution of the human body in the Z direction.
[0017] Preferably, the CT equipment further includes a main controller; wherein...
[0018] The bed control board is connected to the main controller, and the main controller is connected to the scanning device; the main controller stores the position data of each pressure sensor relative to the bed board;
[0019] The main controller is designed to calculate the position of each scanning section relative to the X-ray source and to control the irradiation parameters of the X-ray source.
[0020] Preferably, the array of multiple pressure sensors distributed on the base layer includes a dot array, a rectangular array, and an interleaved array.
[0021] Preferably, the pressure sensors placed in a row or column are electrically connected, such that the row or column of pressure sensors in the array can be controlled as a group by the bed control board.
[0022] Preferably, the pressure sensor is designed as a thin-film press-type sensor, and the internal wires are made of graphene.
[0023] Preferably, the bed board further includes a first cushioning pad, a second cushioning pad, and a mattress; wherein...
[0024] The support plate, the first buffer pad, the sensor layer, the second buffer pad, and the mattress are stacked and contact each other from bottom to top, and the length and width dimensions of each layer cover the contact area between the scanned object and the bed board.
[0025] Compared with existing technologies, this invention, by setting a pressure sensor array on the CT scanner bed, can acquire pressure distribution data of the scanned object, thereby calculating its height, weight, and BMI, and optimizing the radiation dose for each scanning section based on the weight distribution characteristics. Furthermore, it can determine the positional relationship between each scanning section and the radiation source's irradiation range based on the bed's position data, thus controlling the voltage and current parameters of the radiation source according to the required dose for the corresponding scanning section, further improving the scanning accuracy and imaging quality of the CT equipment. Simultaneously, it can monitor the movement of the scanned object in real time, enhancing the safety and reliability of the scan. Attached Figure Description
[0026] Figure 1 This is a schematic diagram of the structure of a CT device that adjusts the irradiation dose according to the local weight distribution in an embodiment of the present invention;
[0027] Figure 2 for Figure 1 A schematic diagram of the bed board structure;
[0028] Figure 3 for Figure 1 Electrical connection diagram of the CT equipment in the diagram;
[0029] Figure 4 for Figure 2 A schematic diagram of the human body weight distribution cloud map obtained from the pressure sensor array. Detailed Implementation
[0030] The technical content of this utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.
[0031] The technical concept in this embodiment of the invention is as follows: Pressure distribution data of the scanned object on the scanning bed is acquired, body mass index (BMI) is calculated, and the irradiation dose is adjusted based on the weight distribution information. Specifically, a pressure sensor array is installed in the bed to measure the pressure data of the scanned object on the sensors. The bed control board calculates the Z-axis body weight distribution and the position of each local tomographic section (scanning section) relative to the radiation source. The main controller controls the voltage and current parameters of the radiation source irradiating the local tomographic sections.
[0032] For example, obese subjects have more fat and muscle tissue, which absorbs and scatters more X-rays, resulting in a reduced amount of X-rays reaching the detector. This can lead to increased noise and low contrast in the images, so the radiation dose from the X-ray source needs to be increased. Conversely, lean subjects experience less attenuation of X-rays, so the corresponding dose needs to be reduced. Even among subjects of the same height and weight, it's necessary to differentiate between broad shoulders and narrow waists versus large abdomen and narrow shoulders. The radiation dose should be increased for sections with more fat and muscle, and decreased for sections with less fat and muscle. This embodiment of the invention can further refine the radiation dose for each local body section based on weight distribution characteristics.
[0033] like Figure 1 As shown, this embodiment of the present invention provides a CT device that adjusts the radiation dose according to local weight distribution, including a scanning bed 1, a scanning device 2, a bed control board 3, and a main controller 4. The bed control board 3 is mounted on the scanning bed 1, and the main controller 4 is mounted on the scanning device 2. Optionally, the main controller 4 is located in the CT device operating room.
[0034] The scanning bed includes a bed frame 11 and a bed board 12. The bed board 12 is slidably connected to the bed frame 11 and can move in and out of the scanning cavity of the scanning device 2 along the Z direction. The bed frame 11 is the support, lifting and telescopic mechanism for the bed board 12.
[0035] like Figure 2 As shown, the bed board 12 includes a support plate 121, a first cushioning pad 122, a sensor layer 123, a second cushioning pad 124, a mattress 125, and a position sensor 126. The length and width dimensions of each layer cover the contact area between the scanned object and the bed board 12. The support plate 121 is the supporting structure of the bed board 12 and is slidably connected to the bed frame 11. One side of the first cushioning pad 122 contacts the support plate 121, and the other side contacts the sensor layer 123. The other side of the sensor layer 123 contacts the second cushioning pad 124. The other side of the second cushioning pad 124 contacts the mattress 125. In other words, the support plate 121, the first cushioning pad 122, the sensor layer 123, the second cushioning pad 124, and the mattress 125 are stacked and contact each other from bottom to top. The support plate 121 provides the supporting structure, the sensor layer 123 provides the function of measuring body weight distribution, the mattress 125 contacts the scanning object, and the sensor layer 123 is wrapped by the first cushioning pad 122 and the second cushioning pad 124 to provide external force and insulation protection. The position sensor 126 is disposed on the bed board 12 and can obtain the position data of the bed board 12 relative to the scanning device 2.
[0036] The sensor layer 123 includes a base layer 1231, multiple pressure sensors 1232, and a sensor interface 1233. The base layer 1231 serves as the support and insulation structure for the pressure sensors 1232. The multiple pressure sensors 1232 are arranged in an array on the base layer 1231, and each pressure sensor 1232 is connected to the sensor interface 1233 via a ribbon cable arranged along the base layer 1231. Optionally, the array form of the multiple pressure sensors 1232 distributed on the base layer 1231 includes a dot array, a rectangular array, and an interleaved array. Optionally, adjacent pressure sensors 1232 can be connected together or placed at a relatively small distance from each other to form a continuous pressure detection surface. The relatively small gap between adjacent pressure sensors 1232 minimizes interruptions or non-detection areas on the detection surface formed by the pressure sensors 1232.
[0037] The pressure sensor 1232 provided in this embodiment is exemplified by a thin-film pressure sensor. To reduce interference from the pressure sensor 1232 to CT imaging, the internal wires of the pressure sensor 1232 are made of non-metallic conductive materials (such as graphene), avoiding the use of copper wires. Simultaneously, the thickness of the pressure sensor 1232 is designed to be no greater than 0.1 mm to avoid forming obvious shadows in the CT image. Preferably, the sensor interface 1233 is located in the section of the bed plate 12 that does not enter the scanning cavity. Optionally, the sensor interface 1233 is located on the side of the bed plate 12 away from the scanning device 2. Optionally, the pressure sensor 1232 is a capacitive sensor or a resistive sensor.
[0038] The bed board 12 is mounted on the bed frame 11 and can move vertically and in the Z-direction as driven by the bed frame 11, and can be inserted into the scanning cavity of the scanning device 2 for scanning as required by the design.
[0039] like Figure 3 As shown, the pressure sensor array 1232 and position sensor 126 are connected to the bed control board 3 via sensor interface 1233. The bed control board 3 is connected to the main controller 4, which is connected to the scanning device 2. The main controller 4 is used to control the irradiation parameters of the X-ray source. The main controller 4 stores the position data of each pressure sensor 1232 relative to the bed board 12, thus enabling it to obtain the height, weight, and BMI of the scanned subject based on the obtained pressure sensor data. Optionally, the pressure sensors 1232 placed in a row or column are electrically connected, allowing the bed control board 3 to control a row or column of pressure sensors 1232 as a group.
[0040] like Figure 4As shown, the pressure sensor array 1232 obtains the weight value of the scanned object on each point of the bed board 12, the position sensor 126 obtains the position data of the bed board 12, and transmits it to the bed control board 3 through ADC (analog-to-digital converter). The bed control board 3 obtains the weight AD value through DMA (direct memory access) and calculates the weight distribution of the human body in the Z direction.
[0041] Position sensor 126 acquires position data of bed board 12 relative to scanning device 2. Main controller 4 stores position data of each pressure sensor 1232 relative to bed board 12. Therefore, main controller 4 can calculate the position of each pressure sensor 1232 relative to the radiation source of scanning device 2. Thus, the position of each scanning section is obtained, i.e., the position of the pressure sensor 1232 at each scanning section relative to the radiation source of scanning device 2, to obtain the scanning section corresponding to the radiation source scanning range, and then adjust the radiation dose based on the body weight distribution data of that scanning section.
[0042] The weight AD value refers to the digital value converted from the analog weight signal (such as the voltage or current corresponding to pressure) detected by the thin-film sensor by the ADC (Analog-to-Digital Converter). Each pressure sensor 1232 individually acquires the analog weight value through the ADC. The bed control board 3 obtains the ADC analog values of these arrays through the DMA function and calculates the average weight of each row of the human body in the Z direction, which is then sent to the main controller 4 via the network. Therefore, the main controller 4 obtains the human body weight value at different bed gate positions. When scanning, when the bed board 12 moves to the bed gate position (obtained by the position sensor 126), the main controller 4 outputs the scanning protocol based on the human body weight value and BMI index at that position, and adjusts the X-ray source voltage and current of the scanning device 2 in real time to control the radiation dose, thereby optimizing the radiation dose and obtaining clear tomographic images.
[0043] Based on the pressure changes of each pressure sensor 1232, the operator can monitor the movement of the scanned object in real time. For example, if the pressure value exceeds a threshold, it indicates that the scanned object is not lying stably on the scanning bed, but is exhibiting limb movement that may affect the irradiation results. In this case, the operator can promptly alert the scanned object or terminate the scanning operation. It is worth noting that if some diseased scanned objects exhibit a stress response (manifested as limb twitching) in the scanning cavity, it may be difficult for the operator to detect it in time due to equipment obstruction or other reasons. The CT equipment provided in this embodiment can detect the body movement of the scanned object in a timely manner through changes in pressure distribution and pressure sensing, allowing for timely intervention.
[0044] In summary, the present invention provides a CT device that adjusts the radiation dose based on local weight distribution. By using a pressure sensor installed on the scanning bed, the device acquires the pressure distribution data of the scanned object on the scanning bed. The device initially optimizes the radiation dose based on the height and weight of the scanned object, further optimizes the radiation dose of each scanning section based on the weight distribution characteristics, and obtains the positional relationship of each scanning section relative to the radiation source irradiation range based on the positional data relative to the bed. Then, the device controls the voltage and current parameters of the radiation source according to the required dose of the corresponding scanning section.
[0045] It should be noted that the above embodiments are merely illustrative examples, and the technical solutions of each embodiment can be combined, all of which are within the protection scope of this utility model.
[0046] The terms “thickness,” “depth,” “upper,” “lower,” “horizontal,” “vertical,” “top,” and “bottom,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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, they should not be construed as limitations on this utility model.
[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.
[0048] The above provides a detailed description of a CT device that adjusts radiation dosage based on local weight distribution, as provided by this utility model. Any obvious modifications made by those skilled in the art without departing from the essential content of this utility model will constitute an infringement of the patent rights of this utility model and will incur corresponding legal liability.
Claims
1. A CT device that adjusts the radiation dose according to local weight distribution, characterized in that... Includes scanning bed and scanning equipment; among which, The scanning bed includes a bed frame and a bed board; the bed board is slidably connected to the bed frame and can be inserted into and removed from the scanning cavity of the scanning device along the Z direction; the bed frame is designed as a support, lifting and telescopic structure for the bed board; The bed board includes a support plate and a sensor layer; the support plate is designed as a support structure for the bed board and is slidably connected to the bed frame; The sensor layer includes a base layer, multiple pressure sensors, and a sensor interface; wherein, the base layer is designed as a support and insulation structure for the pressure sensors, the multiple pressure sensors are distributed in an array on the base layer, and each pressure sensor is connected to the sensor interface via a ribbon cable arranged along the base layer.
2. The CT equipment as described in claim 1, characterized in that: The thickness of the pressure sensor is no more than 0.1 mm as required by design, and its internal wires are made of non-metallic conductive materials.
3. The CT device as described in claim 2, characterized in that: The sensor interface is located on the side of the bed board away from the scanning device.
4. The CT device as described in claim 3, characterized in that... The bed board also includes a position sensor; wherein... The position sensor is mounted on the bed board and is designed to obtain position data of the bed board relative to the scanning device; the position sensor is connected to the sensor interface.
5. The CT device as described in claim 4, characterized in that... It also includes the bed control panel; among which, The sensor interface is connected to the bed control board; the bed control board is designed to acquire the data measured by the pressure sensor through ADC, acquire the weight AD value through DMA, and calculate the weight distribution of the human body in the Z direction.
6. The CT device as described in claim 5, characterized in that... It also includes the main controller; among which, The bed control board is connected to the main controller, and the main controller is connected to the scanning device; the main controller stores the position data of each pressure sensor relative to the bed board; The main controller is designed to calculate the position of each scanning section relative to the X-ray source and to control the irradiation parameters of the X-ray source.
7. The CT device as described in claim 6, characterized in that: The array of multiple pressure sensors distributed on the base layer includes dot array, rectangular array and staggered array.
8. The CT device as described in claim 7, characterized in that: The pressure sensors placed in a row or column are electrically connected so that the row or column of pressure sensors in the array can be controlled as a group by the bed control board.
9. The CT device as described in claim 8, characterized in that: The pressure sensor is designed as a thin-film press-type sensor, and its internal wires are made of graphene.
10. The CT device as described in claim 1, characterized in that... The bed board also includes a first cushioning pad, a second cushioning pad, and a mattress; wherein... The support plate, the first buffer pad, the sensor layer, the second buffer pad, and the mattress are stacked and contact each other from bottom to top, and the length and width dimensions of each layer cover the contact area between the scanned object and the bed board.