CT scanning equipment and rotation control method thereof

Abstract

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

Description

Technical Field

[0001] The present application belongs to the technical field of medical equipment, and more specifically, to a CT scanning device and a rotation control method thereof. Background Art

[0002] Computer tomography (CT) equipment is a medical imaging technology device. Through the examination of CT scanning equipment, doctors can more accurately judge the condition of the subject, thereby improving the diagnosis rate and cure rate of the disease. Therefore, CT scanning equipment plays an irreplaceable role in clinical diagnosis and treatment.

[0003] When an existing CT scanning device performs a cross-sectional scan on a patient, non-contact signal transmission is mainly performed between the rotor part and the stator part of the CT scanning device through optical transmission of a slip ring or radio frequency capacitive coupling of an radio frequency capacitor, and the actual speed of the rotor part and the rotation angle of the rotor part are determined by the encoded signal of the position encoder. The position encoder generally includes a scale and a reader matched with the scale, wherein the scale is arranged on the rotor part along the rotation axis of the rotor part and includes a signal modulation scale pattern, and the reader is arranged on the stator part for identifying the scale, and the reader includes a sensing element and a field generating coil surrounding an internal coil area. Such a special position encoder has a complex structure and high cost, thereby increasing the production cost of the CT scanning device. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a CT scanning device and a rotation control method thereof, so as to solve the technical problem of high production cost of CT scanning devices existing in the prior art.

[0005] To achieve the above-mentioned purpose, 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 slot waveguide antenna is arranged on one of the rotor part and the stator part, and the coupling receiving antenna and the position detection unit are arranged on the other of the rotor part and the stator part;

[0007] The slot waveguide antenna is provided with a plurality of slots, and the plurality of slots are spaced apart and distributed 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.

[0008] Optionally, the slot waveguide antenna includes a carrier on which a conductive medium is arranged and a slot conductor arranged on the carrier, the carrier is 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 connected to the plurality of grooves in a one-to-one correspondence, and the through holes and the corresponding grooves form the slot.

[0009] Optionally, a limiting groove is provided on the carrier, and the slot conductor is limited in 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 shape around the rotation axis on the carrier; or, the slot conductor includes a plurality of strip-shaped metal conductors, and the plurality of strip-shaped metal conductors are arranged in a ring array around the rotation axis on the carrier.

[0011] Optionally, the CT scanning device further comprises an X-ray tube arranged on the rotor part, and a marking slot is provided among the plurality of slots for serving as a starting identification point of the position detection unit, and the marking slot is arranged corresponding to the X-ray tube.

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

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

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

[0015] The present application also provides a rotation control method of a CT scanning device, wherein the CT scanning device includes a rotor part, a stator part, a slot waveguide antenna, and a position detection unit, and the rotation control method includes:

[0016] Acquire slot parameters of a plurality of slots on the slot waveguide antenna, wherein the slot parameters are obtained by identifying the slots on the slot waveguide antenna by the position detection unit, and the slot parameters include positions and time points of the slots;

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

[0018] calculating an actual speed of the rotor portion according to the distance and the time interval;

[0019] The actual speed is compared with a preset target speed, and the actual speed of the rotor part 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 part according to the comparison result includes:

[0021] Comparing the actual speed with the preset target speed, and if the actual speed is less than the preset target speed, increasing the actual speed of the rotor part;

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

[0023] The beneficial effect of the CT scanning device and the rotation control method thereof provided by the present application is that: compared with the prior art, in the process of the rotor part rotating relative to the stator part of the CT scanning device of the present application, the electromagnetic waves in the slot waveguide antenna are radiated outward through multiple slots at the same time, and when the slot on the slot waveguide antenna is directly opposite to 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 the slot on the slot waveguide antenna is directly opposite to the position detection unit, the position detection unit identifies the slot, so that 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 object for the position detection unit to identify, there is no need to arrange additional reference objects such as scales on the rotor part or the 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 used for the CT scanning device and reducing the cost of the position detection related components, thereby helping to reduce the production cost of the CT scanning device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0025] Figure 1 A schematic cross-sectional view of a CT scanning device provided in an embodiment of the present application;

[0026] Figure 2 A schematic cross-sectional view of a slot waveguide antenna according to an embodiment of the present application, wherein the direction indicated by the arrow is the direction of electromagnetic wave radiation;

[0027] Figure 3 A partial structural schematic diagram of a CT scanning device provided in an embodiment of the present application;

[0028] Figure 4 A schematic diagram of a portion of the structure of a slot waveguide antenna provided in an embodiment of the present application;

[0029] Figure 5 This is a flowchart of a rotation control method for a CT scanning device provided in an embodiment of the present application.

[0030] Among them, the reference numerals in the figure are:

[0031] 10. Rotor part; 20. Stator part; 30. Slot waveguide antenna; 31. Slot; 311. Marking slot; 32. Carrier; 321. Groove; 322. Limiting groove; 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 DESCRIPTION

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

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

[0034] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0036] Please also read Figures 1 to 4 , the CT scanning device provided in the embodiment of the present application is now described.

[0037] Please also read Figure 1 and Figure 2 , a CT scanning device, comprising: a rotor part 10, a stator part 20, a slot waveguide antenna 30, a coupling receiving antenna 40 and a position detection unit 50; the slot waveguide antenna 30 is arranged on one of the rotor part 10 and the stator part 20, and the coupling receiving antenna 40 and the position detection unit 50 are arranged on the other of the rotor part 10 and the stator part 20; a plurality of slots 31 are arranged on the slot waveguide antenna 30, and the plurality of slots 31 are spaced apart around the rotation axis a of the rotor part 10, and the slots 31 are used to radiate electromagnetic waves; the coupling receiving antenna 40 is used to receive the electromagnetic waves radiated from the slots 31; and the position detection unit 50 is used to identify the slots 31.

[0038] The rotor part 10 is rotatable relative to the stator part 20 .

[0039] Optionally, the slot waveguide antenna 30 is roughly axially distributed on the outer peripheral side of the rotor part 10 around the rotation axis a of the rotor part 10, and the coupling receiving antenna 40 and the position detection unit 50 are both arranged on the inner peripheral side of the stator part 20; or, the slot waveguide antenna 30 is roughly circularly arranged on the inner peripheral side of the stator part 20 around the rotation axis a of the rotor part 10, and the coupling receiving antenna 40 and the position detection unit 50 are both arranged on the outer peripheral side of the rotor part 10.

[0040] The slot 31 passes through one side of the slot waveguide antenna 30, and the slot 31 is used to radiate electromagnetic waves. It can be understood that the electromagnetic waves in the slot waveguide antenna 30 are radiated outward around the rotation axis a through the plurality of slots 31.

[0041] The coupling receiving antenna 40 and the slot waveguide antenna 30 have a corresponding arrangement 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 to the coupling receiving antenna 40, the coupling receiving antenna 40 can receive the electromagnetic waves radiated from the slot 31, thereby realizing non-contact signal transmission between the slot waveguide antenna 30 and the coupling receiving antenna 40.

[0042] The position detection unit 50 is correspondingly arranged on one side of the slot waveguide antenna 30 having the slot 31. 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 position detection unit 50 in sequence around the rotation axis a. When the slot 31 on the slot waveguide antenna 30 is directly opposite to the position detection unit 50, the position detection unit 50 can identify the slot 31. Therefore, during the rotation of the rotor part 10 relative to the stator part 20, the rotation condition of the rotor part 10, such as the actual speed and rotation angle of the rotor part 10, can be obtained by using the position detection unit 50 to identify the slot 31 on the slot waveguide antenna 30.

[0043] Optionally, the position detection unit 50 may 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 to the position detection unit 50, the position detection unit 50 identifies the slot 31 by transmitting and receiving light beams.

[0044] Optionally, the number of the position detection unit 50 may be one, but the number of the position detection unit 50 is not limited in the embodiment of the present application.

[0045] Compared with the prior art, the CT scanning device provided by the present application is that during the rotation of the rotor part 10 relative to the stator part 20, the electromagnetic waves in the slot waveguide antenna 30 are radiated outward through multiple slots 31 at the same time. When the slot 31 on the slot waveguide antenna 30 is directly opposite to the coupling receiving antenna 40, the coupling receiving antenna 40 receives the electromagnetic waves radiated from the slot 31, thereby realizing non-contact signal transmission between the slot waveguide antenna 30 and the coupling receiving antenna 40. When the slot 31 on the slot waveguide antenna 30 is directly opposite to the position detection unit 50, the position detection unit 50 identifies the slot 31, so that the rotation status of the rotor part 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 object for the position detection unit 50 to identify, there is no need to arrange additional scales or other reference objects for the position detection unit 50 to identify on the rotor part 10 or the stator part 20. At the same time, the position detection unit 50 does not need to use a detection head that matches the scale, and can use an infrared sensor or other conventional detection head that can identify the slot 31. In this way, compared with the position encoder mentioned in the background technology, the present application simplifies the structure of the position detection-related components used for the CT scanning equipment and reduces the cost of the position detection-related components, which is conducive to reducing the production cost of the CT scanning equipment.

[0046] Optionally, the plurality of slots 31 on the slot waveguide antenna 30 are evenly 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 arranged with a conductive medium. The carrier 32 is part of the rotor part 10 or the stator part 20. The carrier 32 is provided with a plurality of grooves 321 evenly spaced around the rotation axis a. The slot conductor 33 is arranged on the carrier 32. The slot conductor 33 is provided with a plurality of through holes 331 evenly spaced 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. The through holes 331 and the corresponding grooves 321 form a slot 31.

[0048] When the slot waveguide antenna 30 is disposed on the rotor part 10, the carrier 32 is a part of the rotor part 10. Specifically, a conductive medium is arranged around the rotation axis a in a part of the rotor part 10, and a plurality of grooves 321 spaced apart around the rotation axis a are provided on the part of the rotor part 10, so that the part of the rotor part 10 forms the carrier 32, and then the slot conductor 33 is attached to the carrier 32, and the plurality of through holes 331 of the slot conductor 33 are connected to the plurality of grooves 321 on the carrier 32 in a one-to-one correspondence, and finally the slot conductor 33 is fixed to the carrier 32, so that the slot conductor 33 is fixedly disposed on the carrier 32, thereby obtaining the slot waveguide antenna 30.

[0049] When the slot waveguide antenna 30 is disposed on the stator part 20, the carrier 32 is a part of the stator part 20. Specifically, a conductive medium is arranged around the rotation axis a in a part of the stator part 20, and a plurality of grooves 321 are provided on the part of the stator part 20 at intervals around the rotation axis a, so that the part of the stator part 20 forms the carrier 32, and then the slot conductor 33 is attached to the carrier 32, and the plurality of through holes 331 of the slot conductor 33 are connected to the plurality of grooves 321 on the carrier 32 in a one-to-one correspondence, and finally the slot conductor 33 is fixed to the carrier 32, so that the slot conductor 33 is fixedly disposed on the carrier 32, thereby obtaining the slot waveguide antenna 30.

[0050] The above technical solution utilizes part of the rotor part 10 or the stator part 20 as the carrier 32, thereby eliminating the need to separately manufacture the carrier 32 part, which is beneficial to simplifying the structure and reducing production costs. At the same time, it makes the structure of the CT scanning equipment more compact, reduces the space occupied by the slot waveguide antenna 30, and is beneficial to reducing the volume of the CT scanning equipment.

[0051] In some embodiments of this application, please refer to Figure 2 A limiting groove 322 is provided on the carrier 32 , and the slot conductor 33 is limited in the limiting groove 322 .

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

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

[0054] The above technical solution, by providing a limiting groove 322 on the carrier 32, limits the slot conductor 33 in the limiting groove 322, so that the fit between the slot conductor 33 and the carrier 32 is more compact, which is beneficial to reducing the volume of the slot waveguide antenna 30 and further reducing the space occupied by the slot waveguide antenna 30. At the same time, by limiting the slot conductor 33 in the limiting groove 322, it is beneficial to strengthen the stability of the assembly between the slot conductor 33 and the carrier 32, and further help to improve the reliability of non-contact signal transmission between the slot waveguide antenna 30 and the coupled receiving antenna 40.

[0055] Optionally, the stability of the assembly between the slot conductor 33 and the carrier 32 may be reinforced by gluing the slot conductor 33 to the inner wall of the limiting groove 322 .

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

[0057] The above technical solution, by adopting an integrally formed strip-shaped metal conductor for the slot conductor 33, makes the slot conductor 33 arranged in a ring shape around the rotation axis a on the carrier 32, which is beneficial to enhance the stability of the assembly between the slot conductor 33 and the carrier 32, and makes the slot conductor 33 not easy to separate from the carrier 32, thereby effectively ensuring the stability of the non-contact signal transmission between the slot waveguide antenna 30 and the coupled receiving antenna 40.

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

[0059] The above technical solution, by forming the slot conductor 33 from a plurality of independently formed strip-shaped metal conductors, can allow the plurality of strip-shaped metal conductors to be separately assembled onto the carrier 32 when assembling the slot conductor 33, thereby facilitating the assembly of the slot conductor 33 onto the carrier 32, making the operation simple, and at the same time helping to improve the accuracy of alignment 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 detecting unit 50 are spaced apart around the rotation axis a.

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

[0062] Optionally, the slot waveguide antenna 30 is disposed on the rotor part 10 , the coupling receiving antenna 40 and the position detection unit 50 are both disposed on the stator part 20 , and the coupling receiving antenna 40 and the position detection unit 50 are respectively located on opposite sides of the rotor part 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 arranged on the rotor part 10, and a marking gap 311 is provided among the plurality of gaps 31. The marking gap 311 is arranged corresponding to the X-ray tube, and the marking gap 311 is used as a starting identification point of the position detection unit 50.

[0064] Before the CT scanning device performs scanning, the marking gap 311 is first aligned with the position detection unit 50 so that the marking gap 311 serves as the starting identification point of the position detection unit 50, that is, the position where the marking gap 311 is located is the zero position. When the rotor part 10 rotates relative to the stator part 20, the rotation angle value of the marking gap 311 can be obtained, and then the rotation angle value of the X-ray tube can be obtained, so as to facilitate the control of the rotation of the rotor part 10.

[0065] Optionally, the slot waveguide antenna 30 is arranged on the rotor part 10, and the marking slot 311 is arranged corresponding to the X-ray tube arranged 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 marking slit 311 is facing the position detection unit 50 is taken as the zero 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 position. Then, the rotor part 10 rotates counterclockwise relative to the stator part 20. When the marking slit 311 is rotated counterclockwise to a position of 90°, it indicates that the X-ray tube has also rotated to this 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 90° position.

[0066] It should be noted that there is no limitation on the marking feature used to distinguish the marking slit 311 from other slits 31, as long as the position detection unit 50 can recognize that the marking slit 311 is different from other slits 31. For example, the marking slit 311 may be distinguished from other slits 31 by setting the size of the marking slit 311 to be different from the size of other slits 31; or the marking slit 311 may be distinguished from other slits 31 by setting the shape of the marking slit 311 to be different from the shape of other slits 31.

[0067] As an example, the position detection unit 50 is an infrared sensor, the width of the marking gap 311 around the rotation axis a is greater than the width of other gaps 31 around the rotation axis a, and the time taken by the position detection unit 50 to transmit a light beam to the marking gap 311 to receive a light beam is greater than the time taken by the position detection unit 50 to transmit a light beam to receive a light beam to other gaps 31. Therefore, the marking gap 311 and other gaps 31 can be distinguished by the fact that the time taken by the position detection unit 50 to transmit a light beam to the marking gap 311 to receive a light beam is different from the time taken by the position detection unit 50 to transmit a light beam to receive a light beam to other gaps 31.

[0068] In some embodiments of this application, please refer to Figure 3 The CT scanning device also includes a radio frequency transmitting unit 60 , which is electrically connected to the slot waveguide antenna 30 , and 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 received electrical signal through the RF 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 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 further includes a waveguide load 70, which is electrically connected to the slot waveguide antenna 30 and is used to absorb excess signal energy in the slot waveguide antenna 30. The excess signal energy refers to signal energy that is not converted into electromagnetic waves to radiate outward in the slot waveguide antenna 30. When this part of the signal energy is transmitted to the waveguide load 70, it is absorbed by the waveguide load 70, and then the waveguide load 70 converts this part of the signal energy into other forms of energy such as heat energy to prevent this part of the signal energy from being reflected back to the slot waveguide antenna 30.

[0071] The above technical solution absorbs the excess signal energy in the slot waveguide antenna 30 through the waveguide load 70, and the excess signal energy in the effective slot waveguide antenna 30 is reflected to interfere with the coupled receiving antenna 40, thereby effectively ensuring the stability and reliability of the non-contact signal transmission between the slot waveguide antenna 30 and the coupled receiving antenna 40.

[0072] Optionally, the RF transmitting unit 60 is electrically connected to one end of the slot waveguide antenna 30, and the RF transmitting unit 60 is electrically connected to the other end of the slot waveguide antenna 30, so that most of the electrical signals transmitted by the RF transmitting unit 60 to the slot waveguide antenna 30 are radiated outward through the slot 31 as electromagnetic waves, and the excess signal energy transmitted to the other end of the slot waveguide antenna 30 and 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 and is used to receive the electrical signals of the coupled receiving antenna 40.

[0074] As an example, the slot waveguide antenna 30 is arranged on the rotor part 10 around the rotation axis a, the coupling receiving antenna 40 and the position detection unit 50 are both arranged on the stator part 20, the RF transmitting unit 60 is electrically connected to the data management system (DMS), the data management system is electrically connected to the detector, and the RF receiving unit 80 is electrically connected to the image processing unit. After the X-rays emitted by the X-ray tube pass through the target part of the subject, they are received by the detector, and the detector converts the received X-rays into electrical signals, which are then transmitted to the image processing unit through the data management system, the RF receiving unit 80, the slot waveguide antenna 30, the coupling receiving antenna 40 and the RF receiving unit 80 in sequence, and a tomographic image of the target part of the subject is constructed on the image processing unit, thereby realizing the wireless transmission of the data signal from the rotor part 10 to the stator part 20. It can be understood that when the slot waveguide antenna 30 is set on the rotor part 10 and the coupling receiving antenna 40 is set on the stator part 20, the data signal can be wirelessly transmitted from the rotor part 10 to the stator part 20 through the cooperation between the slot waveguide antenna 30 and the coupling receiving antenna 40. The data signal can be the original image signal and state feedback signal detected by the detector.

[0075] As another example, the slot waveguide antenna 30 is arranged on the stator part 20 around the rotation axis a, and the coupling receiving antenna 40 and the position detection unit 50 are both arranged on the rotor part 10. The control signal sent by the central controller arranged on the stator part 20 can be wirelessly transmitted to the control unit arranged on the rotor part 10 through the non-contact signal transmission cooperation between the slot waveguide antenna 30 and the coupling receiving antenna 40. It can be understood that when the slot waveguide antenna 30 is arranged on the stator part 20 and the coupling receiving antenna 40 is arranged on the rotor part 10, the data signal can be wirelessly transmitted from the stator part 20 to the rotor part 10 through the cooperation between the slot waveguide antenna 30 and the coupling receiving antenna 40, and the data signal can be a control signal.

[0076] See also Figure 1 , Figure 4 and Figure 5 The present application also provides a rotation control method of a CT scanning device, which is applied to the CT scanning device. The CT scanning device includes a rotor part 10, a stator part 20, a slot waveguide antenna 30 and a position detection unit 50. The rotation control method includes the following steps:

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

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

[0079] Step S30: Calculate the actual speed V of the rotor part 10 according to the distance L and the 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 part 10 relative to the stator part 20, the slot 31 on the slot waveguide antenna 30 is sequentially identified by the position detection unit 50. Specifically, the driving unit drives the rotor part 10 to rotate relative to the stator part 20. During the rotation of the rotor part 10 relative to the stator part 20, the slots 31 at different positions of the slot waveguide antenna 30 relatively sequentially pass through the position detection unit 50 around the rotation axis a. When the slot 31 on the slot waveguide antenna 30 is directly opposite to the position detection unit 50, the position detection unit 50 identifies the slot 31.

[0083] In step S20, since the plurality of slots 31 on the coupling receiving antenna 40 are spaced apart around the rotation axis a, there is a preset distance L between two adjacent slots 31, and during the rotation of the rotor part 10 relative to the stator part 20, the position detection unit 50 identifies that there is 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 of the two adjacent slots 31 is recorded as T1, and the time point at which the position detection unit 50 identifies the second slot 31 of the two adjacent slots 31 is recorded as T2, so that the time interval ΔT between the two adjacent slots 31 identified by the position detection unit 50 is: ΔT=T2-T1.

[0084] It should be noted that the previous gap 31 and the next gap 31 of the two adjacent gaps 31 referred to in the embodiment of the present application refer to the time sequence in which the position detection unit 50 identifies the two adjacent gaps 31.

[0085] In step S30 , the actual speed V of the rotor part 10 is calculated as follows: V=L / ΔT, wherein 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 part 10 is adjusted according to the comparison result, which specifically includes:

[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 part is increased.

[0089] If the actual speed V is greater than the preset target speed V1, the actual speed V of the rotor part is reduced.

[0090] If the actual speed V is consistent with the preset target speed V1, there is no need to adjust the actual speed V of the rotor part 10. The actual speed V is consistent with the preset target speed V1, which 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 instruction to the correction unit that controls the rotation speed of the driving unit, and the correction unit adjusts the rotation speed of the driving unit, and then the driving unit controls the speed at which the rotor part 10 rotates relative to the stator part 20. After adjusting the speed at which the rotor part 10 rotates 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 speed V1 of the rotor part 10.

[0092] The rotation control method of the CT scanning device provided by the present application, compared with the prior art, uses the slot 31 on the slot waveguide antenna 30 as a reference object for the position detection unit 50 to identify, so that there is no need to arrange additional scales on the rotor part 10 or the stator part 20 for the position detection unit 50 to identify the reference object. At the same time, the position detection unit 50 does not need to use a detection head matched with the scale, and can use an infrared sensor or other conventional detection head that can identify the slot 31. In this way, compared with the position encoder mentioned in the background technology, the present application simplifies the structure of the position detection related components used for the CT scanning device and reduces the cost of the position detection related components, thereby helping to reduce the production cost of the CT scanning device. In addition, by using the position detection unit 50 to identify the time interval △T between two adjacent slots 31 and the distance L between two adjacent slots 31, the actual speed V of the rotor part 10 is calculated, and then the actual speed V is compared with the preset target speed V1, and the actual speed of the rotor part 10 is adjusted according to the comparison result. The control method is simple and has high precision, which is conducive to improving the reliability of the working performance of the CT scanning device.

[0093] Optionally, the CT scanning device further comprises an X-ray tube disposed on the rotor part 10 , and the plurality of slits 31 include a marking slit 311 disposed corresponding to the X-ray tube, and the marking slit 311 is used for the position detection unit to identify the starting point of the slit 31 .

[0094] For example, during the rotation of the rotor part 10 relative to the stator part 20, the recording position detection unit 50 identifies the time point of the mark gap 311 as T1. Starting from this, when the position detection unit 50 identifies the gap 31 adjacent to the mark gap 311, the recording time point is T2. From this, it can be obtained that along the rotation direction of the rotor part 10, the time interval △T=T2-T1 between the gap 31 adjacent to the mark gap 311 and the mark gap 311 is identified by the position detection unit 50.

[0095] By setting the marking gap 311 corresponding to the X-ray tube, the processing unit can determine the rotation angle of the X-ray tube by determining the rotation angle of the marking gap 311, and then determine the orientation of the X-ray tube, so that the X-ray tube can emit X-rays to the target part of the subject from different preset orientations, so as to more accurately obtain the tomographic images of the target part of the subject at different preset angles.

[0096] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A CT scanning device, characterized in that: include: A rotor part (10), a stator part (20), a slot waveguide antenna (30), a coupled receiving antenna (40) and a position detection unit (50); The slot waveguide antenna (30) is arranged on one of the rotor part (10) and the stator part (20), and the coupling receiving antenna (40) and the position detection unit (50) are arranged on the other of the rotor part (10) and the stator part (20); The slot waveguide antenna (30) is provided with a plurality of slots (31), the plurality of slots (31) being distributed at intervals around the rotation axis (a) of the rotor part (10), the coupling receiving antenna (40) being used to receive electromagnetic waves radiated from the slots (31); and the position detection unit (50) being used to identify the slots (31).

2. The CT scanning device according to claim 1, characterized in that: The slot waveguide antenna (30) comprises a carrier (32) on which a conductive medium is arranged and a slot conductor (33) arranged 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) connected to the plurality of grooves (321) in a one-to-one correspondence; the through holes (331) and the corresponding grooves (321) form the slot (31).

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

4. The CT scanning device according to claim 2, characterized in that: The slot conductor (33) is an integrally formed strip-shaped metal conductor, and the slot conductor (33) is arranged on the carrier (32) in a ring-shaped manner around the rotation axis (a); or, the slot conductor (33) comprises a plurality of strip-shaped metal conductors, and the plurality of strip-shaped metal conductors are arranged on the carrier (32) in a ring-shaped array around the rotation axis (a).

5. The CT scanning device according to any one of claims 1 to 4, characterized in that: The CT scanning device also includes an X-ray tube arranged on the rotor part, and a marking slot (311) used as a starting identification point of the position detection unit (50) is included in the plurality of slots (31), and the marking slot (311) is arranged corresponding to the X-ray tube.

6. The CT scanning device according to any one of claims 1 to 4, characterized in that: The CT scanning device further comprises a radio frequency transmission unit (60), and the radio frequency transmission unit (60) is electrically connected to the slot waveguide antenna (30).

7. The CT scanning device according to any one of claims 1 to 4, characterized in that: The CT scanning device further comprises a waveguide load (70), wherein the waveguide load (70) is electrically connected to the slot waveguide antenna (30).

8. The CT scanning device according to any one of claims 1 to 4, characterized in that: The CT scanning device further comprises a radio frequency receiving unit (80), wherein the radio frequency receiving unit (80) is electrically connected to the coupled receiving antenna (40).

9. A rotation control method for a CT scanning device, characterized in that: The CT scanning device includes a rotor part, a stator part, a slot waveguide antenna and a position detection unit, and the rotation control method includes: Acquire slot parameters of a plurality of slots on the slot waveguide antenna, wherein the slot parameters are obtained by identifying the slots on the slot waveguide antenna by the position detection unit, and the slot parameters include positions and time points of the slots; Calculate the distance and time interval between two adjacent gaps according to the gap parameters; calculating an actual speed of the rotor portion according to the distance and the time interval; The actual speed is compared with a preset target speed, and the actual speed of the rotor part is adjusted according to the comparison result.

10. The rotation control method according to claim 9, characterized in that: The comparing the actual speed with a preset target speed and adjusting the actual speed of the rotor part according to the comparison result includes: Comparing the actual speed with the preset target speed, and if the actual speed is less than the preset target speed, increasing the actual speed of the rotor part; If the actual speed is greater than the preset target speed, the actual speed of the rotor part is reduced.

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