Antenna device, ct slip ring, and ct apparatus

Abstract

The utility model discloses an antenna device, CT slip ring and CT equipment. Belong to CT equipment technical field, this antenna device is used for CT slip ring, and the antenna device includes: transmitting module and receiving antenna, transmitting module includes: driver, power divider and a plurality of transmitting antennas, and driver is connected with every transmitting antenna through power divider to make every transmitting antenna suitable for transmitting radiation signal, and receiving antenna is used for receiving radiation signal, and the minimum distance of transmitting antenna and receiving antenna is less than radiation signal wavelength, and the non -contact type electromagnetic signal close -range high -speed data transmission can be realized between transmitting module and receiving antenna, and the simple structure of transmitting module, smaller size, lower cost have better product competitiveness.

Description

Technical Field

[0001] This utility model relates to the field of CT equipment, and more specifically, to an antenna device, a CT slip ring, and a CT device. Background Technology

[0002] In related technologies, CT (Computed Tomography) slip rings can employ a phased array antenna data transmission scheme. In this scheme, a phase shifter is installed in each radiating element of the phased array antenna. The phased array antenna combines electromagnetic waves radiated by multiple radiating elements in the far field. Sufficient distance needs to be maintained between the transmitter and receiver, for example, placing the transmitter on a rotating gantry and the receiver on the opposite side of the operating table. This results in a large installation space required for the entire CT machine. Furthermore, the linear velocity of the rotating gantry reaches over 16 m / s. The phase switching of the phased array antenna takes time, and the switching time is slower than the rotation speed of the CT gantry. This causes the main lobe of the transmitter antenna to be unable to align with the receiver, falling into the low-gain range, exceeding the link budget, and making high-speed data transmission difficult. Utility Model Content

[0003] This invention aims to at least partially solve one of the aforementioned technical problems in the prior art. To this end, this invention proposes an antenna device capable of enabling high-speed data transmission over short distances.

[0004] This invention also proposes a CT slip ring having the above-mentioned antenna device.

[0005] This invention also proposes a CT device having the aforementioned CT slip ring.

[0006] According to an embodiment of the present invention, an antenna device is used for a CT slip ring. The antenna device includes: a transmitting module, which includes a driver, a power divider, and a plurality of transmitting antennas. The driver is connected to each of the transmitting antennas through the power divider, so that each of the transmitting antennas is adapted to transmit a radiated signal; and a receiving antenna for receiving the radiated signal. One of the transmitting module and the receiving antenna is adapted to be connected to a rotating part of the CT slip ring, and the other is adapted to be connected to a fixed part of the CT slip ring. The minimum distance between the transmitting antenna and the receiving antenna is less than the wavelength of the radiated signal.

[0007] According to the antenna device of this utility model embodiment, the minimum distance between the transmitting antenna and the receiving antenna is less than the wavelength of the radiated signal. Non-contact, short-range, high-speed data transmission of electromagnetic signals can be achieved between the transmitting module and the receiving antenna. The transmitting module has a simple structure, small size, and low cost, and has good product competitiveness.

[0008] According to some embodiments of the present invention, a plurality of the transmitting antennas are arranged along the circumferential direction of the CT slip ring.

[0009] According to some embodiments of the present invention, the radiated signals of two adjacent transmitting antennas overlap at the receiving antenna.

[0010] According to some embodiments of the present invention, there are multiple transmitting modules, each of which is adapted to be connected to the rotating part of the CT slip ring, and the multiple transmitting modules are arranged along the circumferential direction of the CT slip ring.

[0011] According to some embodiments of the present invention, there are multiple receiving antennas, each of which is adapted to be connected to the fixing part of the CT slip ring, and the multiple receiving antennas are arranged along the circumferential direction of the CT slip ring.

[0012] According to some embodiments of the present invention, the transmitting antenna and the receiving antenna are arranged opposite to each other in the radial or axial direction of the CT slip ring.

[0013] According to some embodiments of this utility model, the transmitting antenna is a microstrip antenna or a horn antenna.

[0014] According to some embodiments of this utility model, the frequency band of the radiated signal is the millimeter wave band.

[0015] According to another embodiment of the present invention, a CT slip ring includes the antenna device described above.

[0016] According to the embodiments of this utility model, the CT slip ring can be used in CT equipment. The minimum distance between its transmitting antenna and receiving antenna is less than the wavelength of the radiated signal. Non-contact, short-range, high-speed data transmission of electromagnetic signals can be achieved between the transmitting module and the receiving antenna. The transmitting module has a simple structure, small size, and low cost, and has good product competitiveness.

[0017] A CT device according to another embodiment of the present invention includes the CT slip ring described above.

[0018] According to the CT device of this utility model embodiment, the minimum distance between the transmitting antenna and the receiving antenna is less than the wavelength of the radiation signal. Non-contact, short-range, high-speed data transmission of electromagnetic signals can be achieved between the transmitting module and the receiving antenna. The transmitting module has a simple structure, small size, and low cost, and has good product competitiveness.

[0019] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the antenna device according to an embodiment of the present invention transmitting data;

[0021] Figure 2 This is a schematic diagram of the rotating part and multiple launching modules according to an embodiment of the present utility model;

[0022] Figure 3 This is a schematic diagram of a rotating part and multiple launching modules according to another embodiment of the present invention;

[0023] Figure 4 This is a block diagram of the transmitting module according to an embodiment of the present utility model;

[0024] Figure 5 This is a schematic diagram of the structure of the transmitting module according to an embodiment of the present utility model;

[0025] Figure 6 This is a schematic diagram of the structure of a transmitting module according to another embodiment of the present invention.

[0026] Figure label:

[0027] Transmitter module 1, driver 11, power divider 12, transmitting antenna 13;

[0028] Receiving antenna 2;

[0029] Antenna device 10; Rotating part 201. Detailed Implementation

[0030] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0031] Furthermore, in the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] The antenna device 10, CT slip ring, and CT equipment according to embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0034] Reference Figures 1-4 As shown, according to an embodiment of the present invention, the antenna device 10 is used for a CT slip ring. The antenna device 10 includes a transmitting module 1 and a receiving antenna 2. The transmitting module 1 includes a driver 11, a power divider 12, and a plurality of transmitting antennas 13. The driver 11 is connected to each transmitting antenna 13 through the power divider 12 so that each transmitting antenna 13 is adapted to transmit radiated signals. The receiving antenna 2 is used to receive radiated signals. One of the transmitting module 1 and the receiving antenna 2 is adapted to be connected to the rotating part 201 of the CT slip ring, and the other is adapted to be connected to the fixing part of the CT slip ring. The minimum spacing between the transmitting antenna 13 and the receiving antenna 23 is less than the wavelength of the radiated signal.

[0035] Specifically, the antenna device 10 can be used in CT slip rings, which can be used in medical diagnostic equipment such as CT equipment. The main functions of the CT slip ring are: power transmission, low-speed signal transmission, and high-speed data transmission. The antenna device 10 includes: a transmitting module 1 and a receiving antenna 2. Non-contact, short-range, high-speed electromagnetic signal data transmission can be achieved between the transmitting module 1 and the receiving antenna 2 to improve image quality, scanning speed, and patient safety.

[0036] The transmitting module 1 may include a driver 11, a power divider 12, and multiple transmitting antennas 13. The driver 11 may be an active device, and the power divider 12 may be a radio frequency power divider (PD). The transmitting module 1 may form a driving circuit. The driver 11 is connected to each transmitting antenna 13 through the power divider 12. The power divider 12 can divide the input signal energy of the driver 11 into multiple output energies corresponding one-to-one with the multiple transmitting antennas 13. The transmitting antennas 13 will radiate the output energy outward in the form of electromagnetic waves to realize data transmission.

[0037] The receiving antenna 23 can be a point antenna, and the receiving antenna 23 can use a single antenna or a combination of multiple antennas to achieve data reception.

[0038] One of the transmitting module 1 and the receiving antenna 2 is adapted to be connected to the rotating part 201 of the CT slip ring, and the other is adapted to be connected to the fixed part of the CT slip ring. That is, when the transmitting module 1 is connected to the rotating part 201 of the CT slip ring, the receiving antenna 2 is connected to the fixed part of the CT slip ring. In this case, the transmitting module 1 can rotate synchronously with the rotating part 201 of the CT slip ring, while the receiving antenna 2 and the fixed part of the CT slip ring are in a stationary state. Conversely, when the transmitting module 1 is connected to the fixed part of the CT slip ring, the receiving antenna 2 is connected to the rotating part 201 of the CT slip ring. In this case, the receiving antenna 2 can rotate synchronously with the rotating part 201 of the CT slip ring, while the transmitting module 1 and the fixed part of the CT slip ring are in a stationary state. The rotating part 201 of the CT slip ring can be disc-shaped (e.g.,...). Figure 2 As shown), it can also be cylindrical (also called cylindrical). The fixing part of the CT slip ring is set adjacent to the rotating part 201 of the CT slip ring. It can be an independent ring mechanism set on the fixed frame of the CT equipment, or it can be the fixed frame of the CT equipment. The fixed frame is used to support the rotating frame on which the slip ring is installed.

[0039] The transmitting antenna 13 and the receiving antenna 23 operate at close range. When they are facing each other, their distance is at its minimum, and this minimum distance can be less than the wavelength of the radiated signal. This reduces the space requirements of the antenna device 10, and allows for a radiated signal range in the millimeter range (e.g., 5 mm). Millimeter-level radiated signals help reduce electromagnetic interference from the antenna device 10 to other devices. Simultaneously, the phase of the radiated signal emitted by each transmitting antenna 13 depends on the length of its transmission path. When the minimum distance between the transmitting antenna 13 and the receiving antenna 23 is less than the wavelength of the radiated signal, they can be considered to be in phase. This means that during the rotation of the slip ring, after the transmitting antenna emits a radiated signal, the radiated signal can be received by the receiving antenna within one wavelength. When the length of the transmission path is equal to or greater than the wavelength, the phase difference between the transmitting antennas 1 (radiating elements) will affect the signal quality. Therefore, the phase difference needs to be controlled close to 0 degrees to avoid a 180-degree difference. In the antenna device 10 of this embodiment, the phase shift of the radiated signal is the result of the signal line length. That is, the phase shift is a constant value. Therefore, the transmitting module 1 does not need to be equipped with a phase controller for adjusting the phase.

[0040] According to the antenna device 10 of this utility model embodiment, the minimum distance between the transmitting antenna 13 and the receiving antenna 23 is less than the wavelength of the radiated signal. Non-contact, short-range, high-speed data transmission of electromagnetic signals can be realized between the transmitting module 1 and the receiving antenna 2. The transmitting module 1 has a simple structure, small size, and low cost, and has good product competitiveness.

[0041] In some embodiments of this utility model, reference is made to Figures 1-4 As shown, multiple transmitting antennas 13 are arranged along the circumferential direction of the CT slip ring.

[0042] Specifically, when the antenna device 10 is working, one of the transmitting module 1 and the receiving antenna 2 will rotate with the rotating part 201 of the CT slip ring. Every time the rotating part 201 of the CT slip ring rotates once, the transmitting module 1 and the receiving antenna 2 will be opposite each other once in the axial or radial direction of the CT slip ring. When the transmitting module 1 and the receiving antenna 2 are opposite each other, at least one transmitting antenna 13 and at least one receiving antenna 23 are opposite each other and transmit data.

[0043] When multiple transmitting antennas 13 are arranged along the circumferential direction of the CT slip ring, the time that the transmitting antennas 13 and the receiving antennas 23 are misaligned can be reduced. That is, every time the rotating part 201 of the CT slip ring rotates once, the receiving antenna 23 can be aligned with multiple transmitting antennas 13 in sequence and transmit data, thereby improving the data transmission time and thus improving the data transmission efficiency between the transmitting module 1 and the receiving antenna 2.

[0044] In some embodiments of this utility model, reference is made to Figure 1 As shown, the radiated signals of two adjacent transmitting antennas 13 overlap at the receiving antenna 23. During each rotation cycle of the rotating part 201 of the CT slip ring, when the transmitting module 1 and the receiving antenna 2 are at least partially opposite, the receiving antenna 23 can continuously receive the radiated signal within the combined range of action of multiple transmitting antennas 13, thereby reducing the generation of intermittent signals and improving data transmission efficiency.

[0045] In some embodiments of this utility model, reference is made to Figure 1 As shown, the radiated signals of any two non-adjacent transmitting antennas 13 do not overlap at the receiving antenna 23. That is, only the radiated signals of two adjacent transmitting antennas 13 overlap at the receiving antenna 23, thereby improving the signal coverage of multiple transmitting antennas 13 in the circumferential direction of the CT slip ring. In other words, the time for the receiving antenna 23 to receive the radiated signal is increased for each rotation of the rotating part 201 of the CT slip ring, which is beneficial to improving the data transmission efficiency between the transmitting module 1 and the receiving antenna 2.

[0046] In some embodiments of this utility model, reference is made to Figure 2 and Figure 3 As shown, there are multiple transmitter modules 1, each transmitter module 1 is adapted to be connected to the rotating part 201 of the CT slip ring, and the multiple transmitter modules 1 are arranged along the circumferential direction of the CT slip ring.

[0047] Specifically, when the number of transmitting modules 1 is N (N≥2), and the N transmitting modules 1 are arranged along the circumferential direction of the CT slip ring, the receiving antenna 2 will be opposite to each transmitting module 1 once in the axial or radial direction of the CT slip ring for each rotation of the rotating part 201 of the CT slip ring. That is, the receiving antenna 2 is opposite to the transmitting module 1 N times. Each time the receiving antenna 2 is opposite to the transmitting module 1, data can be transmitted between the transmitting module 1 and the receiving antenna 2 to improve data transmission efficiency.

[0048] Meanwhile, multiple transmitter modules 1 are arranged along the circumferential direction of the CT slip ring. Each transmitter module 1 can be fixed on the axial end face of the rotating part 201 facing the fixed part. The distance between each transmitter module 1 and the axis of the CT slip ring is the same. Since the rotating part 201 of the CT slip ring rotates during operation, the clearance space required to avoid interference outside the rotating part 201 of the CT slip ring is the same when one transmitter module 1 and multiple transmitter modules 1 are arranged on the rotating part 201. Therefore, arranging multiple transmitter modules 1 on the rotating part 201 of the CT slip ring can improve the space utilization of the CT slip ring.

[0049] Furthermore, in the circumferential direction of the CT slip ring, since the transmitting module 1 has a large number of transmitting antennas 13 arranged sequentially, the length of the transmitting module 1 can be greater than the length of the receiving antenna 2. The longer transmitting module 1 is arranged in the rotating part 201 of the CT slip ring, and the shorter receiving antenna 2 is arranged in the fixing part of the CT slip ring. Other accessories can be arranged outside the receiving antenna 2 in the fixing part of the CT slip ring to improve the space utilization of the CT slip ring.

[0050] It should be noted that multiple transmitting modules 1 can input signals from the same source for data transmission, or they can input signals from different sources to form multiple signal transmission zones, thus diversifying application scenarios. The distance between two adjacent transmitting modules 1 is determined by factors such as the required bandwidth, the number of transmitting antennas 13, and the number of receiving antennas 23.

[0051] In some embodiments of this invention, the specific number of transmitting modules 1 is related to the arc length of the transmitting module 1 and the position of the transmitting module 1 on the CT slip ring. Multiple transmitting modules 1 (e.g., thirty transmitting modules) arranged continuously around the circumference of the slip ring can form a continuous radiation signal area. Multiple transmitting modules 1 arranged intermittently along the circumference of the CT slip ring can form segmented radiation signal areas, realizing a multi-channel slip ring to obtain higher data transmission bandwidth.

[0052] In some embodiments of this utility model, there are multiple receiving antennas 2, each receiving antenna 2 is adapted to be connected to the fixing part of the CT slip ring, and the multiple receiving antennas 2 are arranged along the circumferential direction of the CT slip ring.

[0053] Specifically, when the number of transmitting modules 1 is N (N≥2) and the N transmitting modules 1 are arranged along the circumferential direction of the CT slip ring, and the number of receiving antennas 2 is M (M≥2) and the M receiving antennas 2 are arranged along the circumferential direction of the CT slip ring, each receiving antenna 2 will be opposite to each transmitting module 1 once in the axial or radial direction of the CT slip ring for each rotation of the rotating part 201 of the CT slip ring. That is, the number of times the receiving antenna 2 is opposite to the transmitting module 1 is N*M times. Each time the receiving antenna 2 is opposite to the transmitting module 1, data can be transmitted between the transmitting module 1 and the receiving antenna 2 to improve data transmission efficiency.

[0054] It should be noted that multiple transmitting modules 1 are arranged around the circumference of the CT slip ring, and the effective signal transmission area covered by their combination also surrounds the slip ring. The effective signal transmission area is continuous with respect to each transmitting module 1 (that is, the radiated signals of two adjacent transmitting antennas 13 of each transmitting module 1 overlap at the receiving antenna 23). The effective signal transmission area between different transmitting modules 1 can be continuous or discontinuous depending on the segmentation requirements. In other words, the radiated signals of two adjacent transmitting modules 1 may or may not overlap at the receiving antenna 23.

[0055] In addition, the outer diameter of a CT slip ring is generally greater than one meter, and its circumference is about four meters. In related technologies, CT slip rings can also use capacitive coupling technology for data transmission, which requires laying a whole circle of copper foil antennas on the CT slip ring. However, for copper foil antennas with a length of meter, it is difficult to guarantee the overall processing accuracy of the copper foil antenna, so the amount of data transmission is limited and it is difficult to carry out high-speed data transmission.

[0056] In this embodiment of the invention, each transmitting module 1 and each receiving antenna 2 can be manufactured individually. The size of the transmitting module 1 and the receiving antenna 2 can be at the centimeter level. Therefore, it is only necessary to manufacture each transmitting module 1 and the receiving antenna 2 with high precision within its size range. Then, multiple transmitting modules 1 and / or multiple receiving antennas 2 can be combined to expand to a high bandwidth, thereby helping to reduce the manufacturing and assembly cost of the antenna device 10.

[0057] In some embodiments of this utility model, the transmitting antenna 13 and the receiving antenna 23 are arranged opposite to each other in the radial or axial direction of the CT slip ring. That is, when the transmitting antenna 13 and the receiving antenna 23 are arranged opposite to each other in the radial direction of the CT slip ring, the propagation direction of the radiated signal is the radial direction of the CT slip ring. When the transmitting antenna 13 and the receiving antenna 23 are arranged opposite to each other in the axial direction of the CT slip ring, the propagation direction of the radiated signal is the axial direction of the CT slip ring. The arrangement of the transmitting antenna 13 and the receiving antenna 23 is flexible and convenient.

[0058] In some embodiments of this utility model, the transmitting antenna 13 is a microstrip antenna or a horn antenna.

[0059] Reference Figure 2 and Figure 5 As shown, transmitting antenna 13 is a microstrip antenna, and power divider 12 is a microstrip power divider. Transmitting module 1 uses a combination of twelve microstrip antennas (aa1 to aa12), which are connected together by the microstrip power divider and driven by a driver 11 (chip) containing driving functions. Since both the microstrip antennas and the microstrip power divider can be integrated into a high-frequency PCB substrate, in this embodiment, the transmission direction of the radiated signal ( Figure 2 The direction of the arrow (in the middle) is perpendicular to the base surface of the high-frequency PCB board, meaning that the emission direction of the radiated signal is consistent with the axial direction of the CT slip ring.

[0060] Reference Figure 3 and Figure 6 As shown, the transmitting antenna 13 is a patch horn antenna, and the power divider 12 is a microstrip power divider or a patch power divider. The transmitting module 1 uses eight horn antennas (ab1 to ab8) combined. The patch horn antennas are combined with the power divider 12 and driven by a driver 11 (chip) containing driving functions. In this embodiment, the radiating end face of the horn antenna is perpendicular to the PCB board base where the power divider 12 is located, that is, the direction of transmission of the radiated signal ( Figure 3 The direction of the middle arrow is consistent with the radial direction of the CT slip ring.

[0061] It should be noted that microstrip antennas and microstrip power dividers have cost advantages, and horn antennas and patch power dividers can also achieve the functions corresponding to the transmitting module 1. At the same time, the types of transmitting antenna 13 and power divider 12 are not limited to these.

[0062] In some embodiments of this invention, the frequency band of the radiated signal is the millimeter wave band.

[0063] Specifically, millimeter-wave frequency radiation signals have higher communication frequencies and can transmit more data than low-frequency signals. At the same time, each transmitter module 1 needs to ensure manufacturing precision in areas at the centimeter level. High-precision processing is relatively easy, and its communication frequency can be increased by improving its manufacturing precision, giving transmitter module 1 the advantages of low cost and high yield.

[0064] The antenna device 10 according to the present invention has been verified for feasibility. The test environment was built using millimeter wave frequency band and AKS modulation technology. The transmitting antenna 13 is a standard product, an SMT horn (speaker) antenna, the power divider 12 adopts microstrip mode, and the driver 11 is implemented based on a high-frequency PCB board. In the feasibility verification, the above-mentioned combination was used to form the transmitting module 1, and the receiving antenna 2 adopts a single-channel antenna. It has been verified that stable and efficient data transmission can be achieved.

[0065] In related technologies, CT slip rings can employ a phased array antenna data transmission scheme. In this scheme, a phase shifter is installed in each radiating element of the phased array antenna. The phased array antenna combines electromagnetic waves radiated by multiple radiating elements in the far field. Sufficient distance must be maintained between the transmitter and receiver; for example, placing the transmitter on a rotating gantry and the receiver on the opposite side of the operating table. This results in the CT scanner requiring at least 1.5 times the installation space of existing CT scanners. Furthermore, the linear velocity of the rotating gantry reaches over 16 m / s, and the phase switching of the phased array antenna takes time, which is slower than the rotation speed of the CT gantry. Consequently, the main lobe of the transmitter antenna cannot be aligned with the receiver, falling into the low-gain range and exceeding the link budget. Therefore, this technology also limits the rotation speed of the CT scanner.

[0066] The antenna device 10 of this utility model embodiment differs from the data transmission scheme of a phased array antenna. Non-contact, short-range, high-speed electromagnetic signal data transmission can be achieved between the transmitting module 1 and the receiving antenna 2 to reduce the time patients are exposed to radiation (reduce scanning time), reduce cardiac scanning artifacts, and optimize the patient experience.

[0067] According to another embodiment of the present invention, a CT slip ring includes the antenna device 10 of the above embodiment.

[0068] According to the embodiments of the present invention, the CT slip ring can be used in CT equipment. The minimum distance between the transmitting antenna 13 and the receiving antenna 23 is less than the wavelength of the radiated signal. Non-contact, short-range, high-speed data transmission of electromagnetic signals can be achieved between the transmitting module 1 and the receiving antenna 2. The transmitting module 1 has a simple structure, small size, and low cost, and has good product competitiveness.

[0069] A CT device according to another embodiment of the present invention includes the CT slip ring of the above embodiment.

[0070] According to the CT slip ring of this utility model embodiment, the minimum distance between the transmitting antenna 13 and the receiving antenna 23 is less than the wavelength of the radiated signal. Non-contact, short-range, high-speed data transmission of electromagnetic signals can be realized between the transmitting module 1 and the receiving antenna 2. The transmitting module 1 has a simple structure, small size, and low cost, and has good product competitiveness.

[0071] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0072] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An antenna device, characterized in that, The antenna device is used for a CT slip ring, and the antenna device includes: The transmitting module (1) includes: a driver (11), a power divider (12) and a plurality of transmitting antennas (13). The driver (11) is connected to each of the transmitting antennas (13) through the power divider (12) so that each of the transmitting antennas (13) is adapted to transmit radiated signals. A receiving antenna (2) is used to receive the radiated signal; In this configuration, one of the transmitting module (1) and the receiving antenna (2) is adapted to be connected to the rotating part (201) of the CT slip ring, and the other is adapted to be connected to the fixing part of the CT slip ring. The minimum distance between the transmitting antenna (13) and the receiving antenna (2) is less than the wavelength of the radiated signal.

2. The antenna device according to claim 1, characterized in that, Multiple transmitting antennas (13) are arranged along the circumferential direction of the CT slip ring.

3. The antenna device according to claim 2, characterized in that, The radiated signals from two adjacent transmitting antennas (13) overlap at the receiving antenna (2).

4. The antenna device according to claim 1, characterized in that, The number of the transmitting modules (1) is multiple, each transmitting module (1) is adapted to be connected to the rotating part (201) of the CT slip ring, and the multiple transmitting modules (1) are arranged along the circumferential direction of the CT slip ring.

5. The antenna device according to any one of claims 1-4, characterized in that, The number of receiving antennas (2) is multiple, each receiving antenna (2) is adapted to be connected to the fixing part of the CT slip ring, and the multiple receiving antennas (2) are arranged along the circumferential direction of the CT slip ring.

6. The antenna device according to any one of claims 1-4, characterized in that, In the radial or axial direction of the CT slip ring, the transmitting antenna (13) is arranged opposite to the receiving antenna (2).

7. The antenna device according to any one of claims 1-4, characterized in that, The transmitting antenna (13) is a microstrip antenna or a horn antenna.

8. The antenna device according to any one of claims 1-4, characterized in that, The frequency band of the radiated signal is the millimeter wave band.

9. A CT slip ring, characterized in that, Includes the antenna device according to any one of claims 1-8.

10. A CT scanner, characterized in that, Includes the CT slip ring according to claim 9.

Images