CT scanning apparatus and method of controlling rotation thereof

Abstract

The application belongs to the field of medical equipment and provides a CT scanning device and a rotating control method thereof.The CT scanning device comprises a rotor part, a stator part, a slot waveguide antenna, a coupling receiving antenna and a position detection unit; the slot waveguide antenna is arranged on one of the rotor part and the stator part, the coupling receiving antenna and the position detection unit are arranged on the other one of the rotor part and the stator part; a plurality of slots are arranged on the slot waveguide antenna, the plurality of slots are distributed at intervals around the rotation axis of the rotor part, the coupling receiving antenna is used for receiving electromagnetic waves radiated from the slots; and the position detection unit is used for identifying the slots. In the application, the slots on the slot waveguide antenna are used as reference objects for identification by the position detection unit, so that a scale or the like for identification by the position detection unit does not need to be additionally arranged on the rotor part or the stator part, and the production cost of the scanning device is reduced.

Description

Technical Field

[0001] This application belongs to the field of medical device technology, and more specifically, relates to a CT scanning device and its rotation control method. Background Technology

[0002] Computed Tomography (CT) is a medical imaging technology that allows doctors to more accurately assess the condition of a patient, thereby improving the diagnosis and cure rates. Therefore, CT plays an irreplaceable role in clinical diagnosis and treatment.

[0003] In existing CT scanning equipment, when performing cross-sectional scans on patients, the rotor and stator of the CT scanning equipment mainly transmit signals non-contactly through optical transmission via slip rings or radio frequency capacitive coupling via radio frequency capacitors. The actual speed and rotation angle of the rotor are determined by the encoded signal of the position encoder. The position encoder generally includes a scale and a read head that matches the scale. The scale is arranged on the rotor along the rotation axis of the rotor and includes a signal-modulated scale pattern. The read head is arranged on the stator to identify the scale. The read head includes a sensing element and a field-generating coil surrounding the internal coil area. Such dedicated position encoders have complex structures and high costs, thereby increasing the production cost of CT scanning equipment. Summary of the Invention

[0004] The purpose of this application is to provide a CT scanning device and its rotation control method to solve the technical problem of high production cost of CT scanning devices in the prior art.

[0005] To achieve the above objectives, the technical solution adopted in this application is: to provide a CT scanning device, including: a rotor part, a stator part, a slot waveguide antenna, a coupled receiving antenna, and a position detection unit;

[0006] The slotted waveguide antenna is disposed on one of the rotor portion and the stator portion, and the coupled receiving antenna and the position detection unit are disposed on the other of the rotor portion and the stator portion;

[0007] The slotted waveguide antenna has multiple slots, which are spaced apart around the rotation axis of the rotor section. The coupled receiving antenna is used to receive electromagnetic waves radiated from the slots. The position detection unit is used to identify the slots.

[0008] Optionally, the slot waveguide antenna includes a carrier on which a conductive medium is disposed and a slot conductor disposed on the carrier. The carrier is a part of the rotor part or the stator part. The carrier is provided with a plurality of grooves spaced apart around the rotation axis. The slot conductor is provided with a plurality of through holes that correspond one-to-one with the plurality of grooves and communicate with each other. The through holes and the corresponding grooves form the slot.

[0009] Optionally, the carrier is provided with a limiting groove, and the slit conductor is limited to the limiting groove.

[0010] Optionally, the slot conductor is an integrally formed strip-shaped metal conductor, and the slot conductor is arranged in a ring around the rotation axis on the carrier; or, the slot conductor includes multiple strip-shaped metal conductors, and the multiple strip-shaped metal conductors are arranged in a ring array around the rotation axis on the carrier.

[0011] Optionally, the CT scanning device further includes an X-ray tube disposed on the rotor portion, and a plurality of the slits having a marking slit for serving as the starting identification point of the position detection unit, the marking slit being disposed corresponding to the X-ray tube.

[0012] Optionally, the CT scanning device further includes a radio frequency transmission unit, which is electrically connected to the slot waveguide antenna.

[0013] Optionally, the CT scanning device further includes a waveguide load, which is electrically connected to the slot waveguide antenna.

[0014] Optionally, the CT scanning device further includes a radio frequency receiving unit, which is electrically connected to the coupled receiving antenna.

[0015] This application also provides a rotation control method for a CT scanning device, the CT scanning device including a rotor part, a stator part, a slot waveguide antenna, and a position detection unit, the rotation control method including:

[0016] The slot parameters of multiple slots on the slotted waveguide antenna are obtained. The slot parameters are obtained by the position detection unit identifying the slots on the slotted waveguide antenna. The slot parameters include the position and time point of the slot.

[0017] Calculate the distance and time interval between two adjacent gaps based on the gap parameters;

[0018] The actual speed of the rotor section is calculated based on the distance and the time interval.

[0019] The actual speed is compared with the preset target speed, and the actual speed of the rotor is adjusted according to the comparison result.

[0020] Optionally, comparing the actual speed with a preset target speed and adjusting the actual speed of the rotor section based on the comparison result includes:

[0021] The actual speed is compared with the preset target speed. If the actual speed is less than the preset target speed, the actual speed of the rotor section is increased.

[0022] If the actual speed is greater than the preset target speed, then the actual speed of the rotor section is reduced.

[0023] The beneficial effects of the CT scanning equipment and its rotation control method provided in this application are as follows: Compared with the prior art, during the rotation of the rotor part relative to the stator part in the CT scanning equipment of this application, electromagnetic waves in the slot waveguide antenna are simultaneously radiated outward through multiple slots. When a slot on the slot waveguide antenna is aligned with the coupling receiving antenna, the coupling receiving antenna receives the electromagnetic waves radiated from the slot, thereby realizing non-contact signal transmission between the slot waveguide antenna and the coupling receiving antenna. When a slot on the slot waveguide antenna is aligned with the position detection unit, the position detection unit identifies the slot. Thus, the actual speed and rotation angle of the rotor part relative to the stator part can be obtained by using the position detection unit to identify the slot on the slot waveguide antenna. In this way, by using the slot on the slot waveguide antenna as a reference for the position detection unit, it is not necessary to arrange additional reference objects such as scales on the rotor or stator part for the position detection unit to identify. At the same time, the position detection unit does not need to use a detection head matched with the scale, thereby simplifying the structure of the position detection-related components of the CT scanning equipment and reducing the cost of the position detection-related components, which in turn helps to reduce the production cost of the CT scanning equipment. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application, 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 these drawings without creative effort.

[0025] Figure 1 This is a cross-sectional structural diagram of a CT scanning device provided in an embodiment of this application;

[0026] Figure 2 This is a cross-sectional view of the slotted waveguide antenna provided in an embodiment of this application, where the arrows indicate the direction of electromagnetic wave radiation.

[0027] Figure 3 This is a partial structural schematic diagram of a CT scanning device provided in an embodiment of this application;

[0028] Figure 4 This is a partial structural schematic diagram of the slotted waveguide antenna provided in an embodiment of this application;

[0029] Figure 5 A flowchart illustrating the rotation control method for a CT scanning device provided in this application embodiment.

[0030] The following are the labeling elements in the figure:

[0031] 10. Rotor section; 20. Stator section; 30. Slot waveguide antenna; 31. Slot; 311. Marking slot; 32. Carrier; 321. Groove; 322. Limiting slot; 33. Slot conductor; 331. Through hole; 40. Coupled receiving antenna; 50. Position detection unit; 60. RF transmitting unit; 70. Waveguide load; 80. RF receiving unit; a. Rotation axis. Detailed Implementation

[0032] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0033] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0034] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", 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 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, they should not be construed as limitations on this application.

[0035] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0036] Please refer to the following: Figures 1 to 4 The CT scanning device provided in the embodiments of this application will now be described.

[0037] Please refer to the following: Figure 1 and Figure 2 A CT scanning device includes: a rotor section 10, a stator section 20, a slotted waveguide antenna 30, a coupled receiving antenna 40, and a position detection unit 50; the slotted waveguide antenna 30 is disposed on one of the rotor section 10 and the stator section 20, and the coupled receiving antenna 40 and the position detection unit 50 are disposed on the other of the rotor section 10 and the stator section 20; the slotted waveguide antenna 30 is provided with a plurality of slots 31, which are spaced apart around the rotation axis a of the rotor section 10, and the slots 31 are used to radiate electromagnetic waves; the coupled receiving antenna 40 is used to receive electromagnetic waves radiated from the slots 31; and the position detection unit 50 is used to identify the slots 31.

[0038] The rotor section 10 is capable of rotating relative to the stator section 20.

[0039] Optionally, the slot waveguide antenna 30 is distributed approximately axially around the rotation axis a of the rotor portion 10 on the outer periphery of the rotor portion 10, while the coupling receiving antenna 40 and the position detection unit 50 are both disposed on the inner periphery of the stator portion 20; or, the slot waveguide antenna 30 is disposed approximately in a ring shape around the rotation axis a of the rotor portion 10 on the inner periphery of the stator portion 20, while the coupling receiving antenna 40 and the position detection unit 50 are both disposed on the outer periphery of the rotor portion 10.

[0040] A slot 31 extends through one side of the slot waveguide antenna 30 and is used to radiate electromagnetic waves. Understandably, electromagnetic waves in the slot waveguide antenna 30 are radiated outward about the rotation axis a through multiple slots 31.

[0041] The coupling receiving antenna 40 and the slot waveguide antenna 30 are correspondingly arranged on one side of the slot 31, so that during the rotation of the rotor part 10 relative to the stator part 20, the multiple slots 31 on the slot waveguide antenna 30 pass through the coupling receiving antenna 40 in sequence around the rotation axis a of the rotor part 10. When the slot 31 on the slot waveguide antenna 30 is directly opposite the coupling receiving antenna 40, the coupling receiving antenna 40 can receive the electromagnetic waves radiated from the slot 31, thus realizing non-contact signal transmission between the slot waveguide antenna 30 and the coupling receiving antenna 40.

[0042] The position detection unit 50 is positioned corresponding to the side of the slot waveguide antenna 30 with slots 31. During the rotation of the rotor portion 10 relative to the stator portion 20, multiple slots 31 on the slot waveguide antenna 30 pass sequentially relative to each other around the rotation axis a via the position detection unit 50. When a slot 31 on the slot waveguide antenna 30 is directly opposite the position detection unit 50, the position detection unit 50 can identify the slot 31. Therefore, during the rotation of the rotor portion 10 relative to the stator portion 20, the rotation status of the rotor portion 10, such as its actual speed and rotation angle, can be obtained by using the position detection unit 50 to identify the slots 31 on the slot waveguide antenna 30.

[0043] Optionally, the position detection unit 50 can be, but is not limited to, an infrared sensor, a laser sensor, a radar sensor, or an ultrasonic sensor, as long as it can identify the slot 31 on the slot waveguide antenna 30. As an example, taking the position detection unit 50 as an infrared sensor, when the slot 31 on the slot waveguide antenna 30 is directly opposite the position detection unit 50, the position detection unit 50 identifies the slot 31 by emitting and receiving a light beam.

[0044] Optionally, the number of position detection units 50 can be one, but the number of position detection units 50 is not limited in this embodiment.

[0045] Compared with the prior art, the CT scanning device provided in this application allows electromagnetic waves in the slot waveguide antenna 30 to radiate outward through multiple slots 31 during the rotation of the rotor part 10 relative to the stator part 20. When the slots 31 on the slot waveguide antenna 30 are directly opposite the coupled receiving antenna 40, the coupled receiving antenna 40 receives the electromagnetic waves radiated from the slots 31, thereby realizing non-contact signal transmission between the slot waveguide antenna 30 and the coupled receiving antenna 40. When the slot 31 on the slot waveguide antenna 30 is aligned with the position detection unit 50, the position detection unit 50 identifies the slot 31. Thus, the rotation of the rotor portion 10 can be obtained by using the position detection unit 50 to identify the slot 31 on the slot waveguide antenna 30. In this way, by using the slot 31 on the slot waveguide antenna 30 as a reference for the position detection unit 50, it is unnecessary to additionally arrange a scale or similar reference on the rotor portion 10 or stator portion 20 for the position detection unit 50 to identify. Furthermore, the position detection unit 50 does not need to use a detection head that matches the scale; a conventional detection head such as an infrared sensor that can identify the slot 31 is sufficient. Therefore, compared to the position encoder mentioned in the background art, this application simplifies the structure of the position detection-related components for CT scanning equipment and reduces the cost of these components, thereby helping to reduce the production cost of CT scanning equipment.

[0046] Optionally, multiple slots 31 on the slot waveguide antenna 30 are uniformly distributed around the rotation axis a and form a circular array.

[0047] In some embodiments of this application, please refer to Figure 2 The slot waveguide antenna 30 includes a carrier 32 and a slot conductor 33. The carrier 32 is provided with a conductive medium and is part of the rotor part 10 or the stator part 20. The carrier 32 is provided with a plurality of grooves 321 evenly distributed around the rotation axis a. The slot conductor 33 is disposed on the carrier 32 and is provided with a plurality of through holes 331 evenly distributed around the rotation axis a. The plurality of through holes 331 are connected to the plurality of grooves 321 in a one-to-one correspondence, and the through holes 331 and the corresponding grooves 321 form a slot 31.

[0048] In this configuration, when the slotted waveguide antenna 30 is mounted on the rotor portion 10, the carrier 32 is a portion of the rotor portion 10. Specifically, a conductive medium is arranged around the rotation axis a in a portion of the rotor portion 10, and multiple grooves 321 spaced apart around the rotation axis a are formed on this portion of the rotor portion 10, so that this portion of the rotor portion 10 forms the carrier 32. Then, a slotted conductor 33 is attached to the carrier 32, and multiple through holes 331 of the slotted conductor 33 are connected to multiple grooves 321 on the carrier 32 in a one-to-one correspondence. Finally, the slotted conductor 33 and the carrier 32 are fixed together, so that the slotted conductor 33 is fixedly mounted on the carrier 32, thereby obtaining the slotted waveguide antenna 30.

[0049] When the slotted waveguide antenna 30 is mounted on the stator portion 20, the carrier 32 is a part of the stator portion 20. Specifically, a conductive medium is arranged around the rotation axis a in a part of the stator portion 20, and multiple grooves 321 spaced apart around the rotation axis a are formed on this part of the stator portion 20, so that this part of the stator portion 20 forms the carrier 32. Then, the slotted conductor 33 is attached to the carrier 32, and multiple through holes 331 of the slotted conductor 33 are connected to the multiple grooves 321 on the carrier 32 in a one-to-one correspondence. Finally, the slotted conductor 33 and the carrier 32 are fixed together, so that the slotted conductor 33 is fixedly mounted on the carrier 32, thereby obtaining the slotted waveguide antenna 30.

[0050] The above technical solution utilizes a portion of the rotor part 10 or the stator part 20 as the carrier 32, thereby eliminating the need to separately manufacture the carrier 32. This simplifies the structure, reduces production costs, and makes the CT scanning equipment more compact. It also reduces the space occupied by the slot waveguide antenna 30, which helps to reduce the size of the CT scanning equipment.

[0051] In some embodiments of this application, please refer to Figure 2 The carrier 32 is provided with a limiting groove 322, and the gap conductor 33 is limited within the limiting groove 322.

[0052] The limiting groove 322 is annular around the rotation axis a, and the gap conductor 33 is annular around the rotation axis a and is limited within the limiting groove 322.

[0053] Specifically, when the carrier 32 is part of the rotor portion 10, a limiting groove 322 in an annular shape around the rotation axis a is formed on the portion of the rotor portion 10 corresponding to the carrier 32, and then the slot conductor 33 is annularly engaged in the limiting groove 322 on the rotor portion 10 around the rotation axis a. When the carrier 32 is part of the stator portion 20, a limiting groove 322 in an annular shape around the rotation axis a is formed on the portion of the stator portion 20 corresponding to the carrier 32, and then the slot conductor 33 is annularly engaged in the limiting groove 322 on the stator portion 20 around the rotation axis a.

[0054] The above technical solution, by providing a limiting groove 322 on the carrier 32, confines the slot conductor 33 within the limiting groove 322, making the fit between the slot conductor 33 and the carrier 32 more compact. This helps to reduce the volume of the slot waveguide antenna 30 and further reduce the space occupied by the slot waveguide antenna 30. At the same time, by confining the slot conductor 33 within the limiting groove 322, it helps to strengthen the stability of the assembly between the slot conductor 33 and the carrier 32, thereby improving the reliability of non-contact signal transmission between the slot waveguide antenna 30 and the coupled receiving antenna 40.

[0055] Alternatively, the stability of the assembly between the slot conductor 33 and the carrier 32 can be strengthened by means of adhesive bonding between the slot conductor 33 and the inner wall of the limiting groove 322.

[0056] In some embodiments of this application, the gap conductor 33 is an integrally formed strip-shaped metal conductor, and the gap conductor 33 is arranged in a ring around the rotation axis a on the carrier 32.

[0057] The above technical solution, by using an integrally formed strip-shaped metal conductor for the slot conductor 33, so that the slot conductor 33 is arranged in a ring around the rotation axis a on the carrier 32, helps to strengthen the stability of the assembly between the slot conductor 33 and the carrier 32, making it less likely for the slot conductor 33 to detach from the carrier 32, thereby effectively ensuring the stability of non-contact signal transmission between the slot waveguide antenna 30 and the coupled receiving antenna 40.

[0058] In another embodiment of this application, the gap conductor 33 includes a plurality of strip-shaped metal conductors, which are independently formed and arranged in a ring array on the carrier 32 around the rotation axis a.

[0059] The above technical solution, by making the slot conductor 33 composed of multiple independently formed strip-shaped metal conductors, allows the multiple strip-shaped metal conductors to be individually assembled onto the carrier 32 when assembling the slot conductor 33. This makes it easy to assemble the slot conductor 33 onto the carrier 32, simplifies the operation, and helps improve the alignment accuracy between the through hole 331 on the slot conductor 33 and the groove 321 on the carrier 32.

[0060] In some embodiments of this application, please refer to Figure 1 and Figure 3 The coupling receiving antenna 40 and the position detection unit 50 are spaced apart around the rotation axis a.

[0061] In the above technical solution, since both the coupling receiving antenna 40 and the position detection unit 50 are disposed on the stator part 20 or the rotor part 10, the coupling receiving antenna 40 and the position detection unit 50 are arranged at intervals around the rotation axis a, thereby effectively avoiding mutual interference between the coupling receiving antenna 40 and the position detection unit 50.

[0062] Optionally, the slotted waveguide antenna 30 is disposed on the rotor portion 10, and the coupled receiving antenna 40 and the position detection unit 50 are both disposed on the stator portion 20. The coupled receiving antenna 40 and the position detection unit 50 are located on opposite sides of the rotor portion 10 around the rotation axis a.

[0063] In some embodiments of this application, please refer to Figure 4 The CT scanning device also includes an X-ray tube disposed on the rotor part 10, and a marking slit 311 is provided in a plurality of slits 31. The marking slit 311 is disposed corresponding to the X-ray tube and is used as the starting identification point of the position detection unit 50.

[0064] Before the CT scanning equipment performs a scan, the marking slit 311 is aligned with the position detection unit 50, so that the marking slit 311 serves as the starting identification point of the position detection unit 50, that is, the position where the marking slit 311 is located is the zero point position. When the rotor part 10 rotates relative to the stator part 20, the rotation angle value of the marking slit 311 can be obtained, thereby obtaining the rotation angle value of the X-ray tube, which facilitates the control of the rotation operation of the rotor part 10.

[0065] Optionally, the slot waveguide antenna 30 is disposed on the rotor part 10, and the marking slot 311 is disposed corresponding to the X-ray tube disposed on the rotor part 10. In other words, the marking slot 311 and the X-ray tube are located in the same orientation around the rotation axis a. It can be understood that the orientation of the marking slot 311 is the orientation of the X-ray tube. During the rotation of the rotor part 10 relative to the stator part 20, the rotation angle of the X-ray tube can be obtained by obtaining the rotation angle of the marking slot 311, thereby determining the orientation of the X-ray tube. For example, the position when the marker slit 311 is directly opposite the position detection unit 50 is taken as the zero point position. At this time, the X-ray tube emits X-rays to the target part of the subject to obtain a tomographic image of the target part of the subject at the zero point position. Then, the rotor part 10 rotates counterclockwise relative to the stator part 20. When the marker slit 311 is rotated counterclockwise to a position of 90°, it means that the X-ray tube has also rotated to that position. At this time, the X-ray tube emits X-rays to the target part of the subject again to obtain a tomographic image of the target part of the subject at a position of 90°.

[0066] It should be noted that there are no restrictions on the marking features used to distinguish the marked gap 311 from other gaps 31, as long as the position detection unit 50 can identify that the marked gap 311 is different from other gaps 31. For example, the marked gap 311 can be distinguished from other gaps 31 by setting its size to be different from the size of other gaps 31; or, the marked gap 311 can be distinguished from other gaps 31 by setting its shape to be different from the shape of other gaps 31.

[0067] As an example, the position detection unit 50 is an infrared sensor. The width of the marked slit 311 around the rotation axis a is greater than the width of the other slits 31 around the rotation axis a. The time taken for the position detection unit 50 to emit a light beam to the marked slit 311 and receive the light beam is greater than the time taken for the position detection unit 50 to emit a light beam to the other slits 31 and receive the light beam. Therefore, the marked slit 311 can be distinguished from other slits 31 by the difference between the time taken for the position detection unit 50 to emit a light beam to the marked slit 311 and receive the light beam.

[0068] In some embodiments of this application, please refer to Figure 3 The CT scanning device also includes an RF transmission unit 60, which is electrically connected to the slot waveguide antenna 30. The RF transmission unit 60 is used to receive and modulate electrical signals and transmit the modulated electrical signals to the slot waveguide antenna 30.

[0069] The above technical solution modulates the electrical signal received by the radio frequency transmitting unit 60 and transmits the modulated electrical signal to the slot waveguide antenna 30, so that the electrical signal can be transmitted on the slot waveguide antenna 30 and radiated out from the slot 31 in the form of electromagnetic waves.

[0070] In some embodiments of this application, please refer to Figure 3 The CT scanning device also includes a waveguide load 70, which is electrically connected to the slot waveguide antenna 30. The waveguide load 70 is used to absorb excess signal energy in the slot waveguide antenna 30. Excess signal energy refers to signal energy in the slot waveguide antenna 30 that has not been converted into electromagnetic waves for outward radiation. When this portion of signal energy is transmitted to the waveguide load 70, it is absorbed by the waveguide load 70, which then converts this portion of signal energy into heat or other forms of energy to prevent it from being reflected back to the slot waveguide antenna 30.

[0071] The above technical solution absorbs excess signal energy in the slotted waveguide antenna 30 through the waveguide load 70, effectively preventing excess signal energy in the slotted waveguide antenna 30 from interfering with the coupled receiving antenna 40, thus effectively ensuring the stability and reliability of non-contact signal transmission between the slotted waveguide antenna 30 and the coupled receiving antenna 40.

[0072] Optionally, the radio frequency (RF) transmitting unit 60 is electrically connected to one end of the slot waveguide antenna 30, and the other end of the RF transmitting unit 60 is electrically connected to the slot waveguide antenna 30. Thus, most of the electrical signal transmitted from the RF transmitting unit 60 to the slot waveguide antenna 30 is radiated outward as electromagnetic waves through the slot 31. The excess signal energy transmitted to the other end of the slot waveguide antenna 30 that is not converted into electromagnetic waves for outward radiation is absorbed by the waveguide load 70.

[0073] In some embodiments of this application, please refer to Figure 3 The coupled receiving antenna 40 is also used to convert the received electromagnetic waves into electrical signals. The CT scanning device also includes a radio frequency receiving unit 80, which is electrically connected to the coupled receiving antenna 40. The radio frequency receiving unit 80 is used to receive the electrical signals from the coupled receiving antenna 40.

[0074] As an example, the slotted waveguide antenna 30 is mounted on the rotor section 10 around the rotation axis a, while the coupled receiving antenna 40 and the position detection unit 50 are both mounted on the stator section 20. The radio frequency transmission unit 60 is electrically connected to the data management system (DMS), which is electrically connected to the detector. The radio frequency receiving unit 80 is electrically connected to the image processing unit. X-rays emitted by the X-ray tube pass through the target area of ​​the subject and are received by the detector. The detector converts the received X-rays into electrical signals, which are then transmitted sequentially through the data management system, the radio frequency receiving unit 80, the slotted waveguide antenna 30, the coupled receiving antenna 40, and the radio frequency receiving unit 80 to the image processing unit. The image processing unit then constructs a tomographic image of the target area of ​​the subject, thereby wirelessly transmitting the data signal from the rotor section 10 to the stator section 20. Understandably, when the slot waveguide antenna 30 is mounted on the rotor section 10 and the coupled receiving antenna 40 is mounted on the stator section 20, the data signal can be wirelessly transmitted from the rotor section 10 to the stator section 20 through the cooperation between the slot waveguide antenna 30 and the coupled receiving antenna 40. The data signal can be the raw image signal and the status feedback signal detected by the detector.

[0075] As another example, the slotted waveguide antenna 30 is mounted on the stator section 20 about the rotation axis a, while the coupled receiving antenna 40 and the position detection unit 50 are both mounted on the rotor section 10. Through non-contact signal transmission between the slotted waveguide antenna 30 and the coupled receiving antenna 40, control signals from the central controller mounted on the stator section 20 can be wirelessly transmitted to the control unit mounted on the rotor section 10. It can be understood that when the slotted waveguide antenna 30 is mounted on the stator section 20 and the coupled receiving antenna 40 is mounted on the rotor section 10, the cooperation between the slotted waveguide antenna 30 and the coupled receiving antenna 40 enables wireless transmission of data signals from the stator section 20 to the rotor section 10; these data signals can be control signals.

[0076] Please see Figure 1 , Figure 4 and Figure 5 This application also provides a rotation control method for a CT scanning device, which includes a rotor portion 10, a stator portion 20, a slot waveguide antenna 30, and a position detection unit 50. The rotation control method includes the following steps:

[0077] Step S10: Obtain the slot parameters of multiple slots 31 on the slot waveguide antenna 30. The slot parameters are obtained by the position detection unit 50 identifying the slots 31 on the slot waveguide antenna 30. The slot parameters include the position and time point of the slot 31.

[0078] Step S20: Calculate the distance L and time interval ΔT between two adjacent gaps 31 based on the gap parameters.

[0079] Step S30: Calculate the actual speed V of rotor section 10 based on distance L and time interval ΔT.

[0080] Step S40: Compare the actual speed V with the preset target speed V1, and adjust the actual speed of the rotor part 10 according to the comparison result.

[0081] It should be noted that the actual speed V refers to the actual speed at which the rotor part 10 rotates relative to the stator part 20, and the preset target speed V1 refers to the preset target speed at which the rotor part 10 rotates relative to the stator part 20.

[0082] In step S10, during the rotation of the rotor portion 10 relative to the stator portion 20, the position detection unit 50 sequentially identifies the slots 31 on the slot waveguide antenna 30. Specifically, the rotor portion 10 is driven to rotate relative to the stator portion 20 by the drive unit. During the rotation of the rotor portion 10 relative to the stator portion 20, the slots 31 at different positions on the slot waveguide antenna 30 sequentially pass relative to the position detection unit 50 around the rotation axis a. When a slot 31 on the slot waveguide antenna 30 is directly opposite the position detection unit 50, the position detection unit 50 identifies the slot 31.

[0083] In step S20, since the multiple slots 31 on the coupled receiving antenna 40 are spaced apart around the rotation axis a, there is a preset distance L between two adjacent slots 31. During the rotation of the rotor part 10 relative to the stator part 20, the position detection unit 50 identifies a time difference, i.e., a time interval ΔT, between two adjacent slots 31. For example, the time point at which the position detection unit 50 identifies the first slot 31 among two adjacent slots 31 is recorded as T1, and the time point at which the position detection unit 50 identifies the second slot 31 among two adjacent slots 31 is recorded as T2. Therefore, the position detection unit 50 identifies the time interval ΔT between two adjacent slots 31 as: ΔT = T2 - T1.

[0084] It should be noted that, in the embodiments of this application, the first gap 31 and the second gap 31 in two adjacent gaps 31 refer to the order in which the position detection unit 50 identifies the two adjacent gaps 31.

[0085] In step S30, the formula for calculating the actual speed V of the rotor part 10 is: V = L / ΔT, where V is the actual speed V of the rotor part 10, ΔT is the time interval between two adjacent gaps 31 identified by the position detection unit 50, and L is the distance between two adjacent gaps 31.

[0086] It should be noted that the distance L between two adjacent slots 31 refers to the arc length between two adjacent slots 31 along the circumferential direction of the slot waveguide antenna 30.

[0087] In step S40, the actual speed V is compared with the preset target speed V1, and the actual speed of the rotor section 10 is adjusted according to the comparison result, specifically including:

[0088] The actual speed V is compared with the preset target speed V1. If the actual speed V is less than the preset target speed V1, the actual speed V of the rotor is increased.

[0089] If the actual speed V is greater than the preset target speed V1, then reduce the actual speed V of the rotor section.

[0090] If the actual speed V is consistent with the preset target speed V1, then there is no need to adjust the actual speed V of the rotor part 10. Here, "the actual speed V is consistent with the preset target speed V1" means that the actual speed V is equal to the preset target speed V1, or the actual speed V is within the error range of the preset target speed V1.

[0091] Specifically, if the actual speed V is less than or greater than the preset target speed V1, that is, if the actual speed V is inconsistent with the preset target speed V1, the processing unit of the CT scanning device sends an adjustment command to the correction unit that controls the rotation speed of the drive unit. The correction unit adjusts the rotation speed of the drive unit, and then the drive unit controls the rotation speed of the rotor part 10 relative to the stator part 20. After adjusting the rotation speed of the rotor part 10 relative to the stator part 20, the above steps S10-S40 are repeated until the actual rotation speed V of the rotor part 10 relative to the stator part 20 is consistent with the target rotation speed V1 of the rotor part 10.

[0092] Compared with the prior art, the rotation control method for the CT scanning equipment provided in this application utilizes the slit 31 on the slit waveguide antenna 30 as a reference for the position detection unit 50. This eliminates the need for additional scales or similar references on the rotor or stator 20 for the position detection unit 50 to identify. Furthermore, the position detection unit 50 does not require a detection head compatible with a scale; a conventional detection head capable of identifying the slit 31, such as an infrared sensor, can be used. Thus, compared to the position encoders mentioned in the prior art, this application simplifies the structure of the position detection components for the CT scanning equipment and reduces their cost, thereby lowering the production cost of the CT scanning equipment. Additionally, by using the position detection unit 50 to identify the time interval ΔT between two adjacent slits 31 and the distance L between them, the actual speed V of the rotor 10 is calculated. Then, the actual speed V is compared with a preset target speed V1, and the actual speed of the rotor 10 is adjusted based on the comparison result. This control method is simple and highly accurate, improving the reliability of the CT scanning equipment's performance.

[0093] Optionally, the CT scanning device also includes an X-ray tube disposed on the rotor portion 10, and a plurality of slits 31 having a marking slit 311 corresponding to the X-ray tube, the marking slit 311 being the starting point for the position detection unit to identify the slit 31.

[0094] For example, during the rotation of the rotor section 10 relative to the stator section 20, the time point at which the position detection unit 50 identifies the marked gap 311 is recorded as T1. Starting from this point, when the position detection unit 50 identifies the gap 31 adjacent to the marked gap 311, the time point is recorded as T2. Thus, along the rotation direction of the rotor section 10, the time interval ΔT = T2 - T1 between the gap 31 adjacent to the marked gap 311 and the marked gap 311 identified by the position detection unit 50 can be obtained.

[0095] By setting the marked slit 311 in correspondence with the X-ray tube, the processing unit can determine the rotation angle of the X-ray tube by determining the rotation angle of the marked slit 311, and then determine the orientation of the X-ray tube. This enables the X-ray tube to emit X-rays from different preset orientations to the target part of the subject, so as to obtain tomographic images of the target part of the subject at different preset angles with greater precision.

[0096] The above description is merely a preferred embodiment of this application and is 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 scanning device, characterized in that, include: The rotor section (10), the stator section (20), the slot waveguide antenna (30), the coupled receiving antenna (40), and the position detection unit (50) are all included. The slot waveguide antenna (30) is disposed on one of the rotor part (10) and the stator part (20), and the coupled receiving antenna (40) and the position detection unit (50) are disposed on the other of the rotor part (10) and the stator part (20); The slotted waveguide antenna (30) has multiple slots (31) spaced apart around the rotation axis (a) of the rotor portion (10). The coupled receiving antenna (40) is used to receive electromagnetic waves radiated from the slots (31). The position detection unit (50) is used to identify the slots (31). The coupled receiving antenna (40) and the position detection unit (50) are spaced apart around the rotation axis (a). The slotted waveguide antenna (30) includes conductive dielectrics. The carrier (32) is a material carrier (32) and a slot conductor (33) disposed on the carrier (32). The carrier (32) is a part of the rotor part (10) or the stator part (20). The carrier (32) is provided with a plurality of grooves (321) spaced apart around the rotation axis (a). The slot conductor (33) is provided with a plurality of through holes (331) that correspond one-to-one with the plurality of grooves (321). The through holes (331) and the corresponding grooves (321) form the slots (31).

2. The CT scanning device according to claim 1, characterized in that: The carrier (32) is provided with a limiting groove (322), and the gap conductor (33) is limited to the limiting groove (322).

3. The CT scanning device according to claim 1, characterized in that: The slot conductor (33) is an integrally formed strip metal conductor, and the slot conductor (33) is arranged in a ring around the rotation axis (a) on the carrier (32); or, the slot conductor (33) includes a plurality of strip metal conductors, and the plurality of strip metal conductors are arranged in a ring array around the rotation axis (a) on the carrier (32).

4. The CT scanning device according to any one of claims 1-3, characterized in that: The CT scanning device also includes an X-ray tube disposed on the rotor portion, and a plurality of the slits (31) have a marking slit (311) for serving as the starting identification point of the position detection unit (50), and the marking slit (311) is disposed corresponding to the X-ray tube.

5. The CT scanning device according to any one of claims 1-3, characterized in that: The CT scanning device also includes a radio frequency transmission unit (60), which is electrically connected to the slot waveguide antenna (30).

6. The CT scanning device according to any one of claims 1-3, characterized in that: The CT scanning device also includes a waveguide load (70), which is electrically connected to the slot waveguide antenna (30).

7. The CT scanning device according to any one of claims 1-3, characterized in that: The CT scanning device also includes a radio frequency receiving unit (80), which is electrically connected to the coupled receiving antenna (40).

8. A rotation control method for a CT scanning device as described in any one of claims 1-7, characterized in that, The CT scanning device includes a rotor section, a stator section, a slotted waveguide antenna, and a position detection unit. The rotation control method includes: The slot parameters of multiple slots on the slotted waveguide antenna are obtained. The slot parameters are obtained by the position detection unit identifying the slots on the slotted waveguide antenna. The slot parameters include the position and time point of the slot. Calculate the distance and time interval between two adjacent gaps based on the gap parameters; The actual speed of the rotor section is calculated based on the distance and the time interval. The actual speed is compared with the preset target speed, and the actual speed of the rotor is adjusted according to the comparison result.

9. The rotation control method according to claim 8, characterized in that: The step of comparing the actual speed with a preset target speed and adjusting the actual speed of the rotor section based on the comparison result includes: The actual speed is compared with the preset target speed. If the actual speed is less than the preset target speed, the actual speed of the rotor section is increased. If the actual speed is greater than the preset target speed, then the actual speed of the rotor section is reduced.

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