CN113253174B - Receiving antenna assembly and magnetic resonance device - Google Patents
Receiving antenna assembly and magnetic resonance device Download PDFInfo
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- CN113253174B CN113253174B CN202110525773.1A CN202110525773A CN113253174B CN 113253174 B CN113253174 B CN 113253174B CN 202110525773 A CN202110525773 A CN 202110525773A CN 113253174 B CN113253174 B CN 113253174B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
- A61B5/055—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/36—Electrical details, e.g. matching or coupling of the coil to the receiver
- G01R33/3621—NMR receivers or demodulators, e.g. preamplifiers, means for frequency modulation of the MR signal using a digital down converter, means for analog to digital conversion [ADC] or for filtering or processing of the MR signal such as bandpass filtering, resampling, decimation or interpolation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/36—Electrical details, e.g. matching or coupling of the coil to the receiver
- G01R33/3642—Mutual coupling or decoupling of multiple coils, e.g. decoupling of a receive coil from a transmission coil, or intentional coupling of RF coils, e.g. for RF magnetic field amplification
- G01R33/365—Decoupling of multiple RF coils wherein the multiple RF coils have the same function in MR, e.g. decoupling of a receive coil from another receive coil in a receive coil array, decoupling of a transmission coil from another transmission coil in a transmission coil array
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/36—Electrical details, e.g. matching or coupling of the coil to the receiver
- G01R33/3692—Electrical details, e.g. matching or coupling of the coil to the receiver involving signal transmission without using electrically conductive connections, e.g. wireless communication or optical communication of the MR signal or an auxiliary signal other than the MR signal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
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Abstract
The invention provides a receiving antenna assembly and a magnetic resonance device, wherein the receiving antenna assembly comprises: at least one receiving antenna; the receiving antenna comprises a base and two antenna units; one ends of the two antenna units are respectively connected with the base, the two antenna units form a first annular body with a first opening, and the other ends of the two antenna units are oppositely arranged and spaced by a first preset distance to form the first opening; wherein the antenna unit is a flexible structure. The first annular body formed by the two antenna units is configured to form the dipole antenna, the structure is simple, the resonant frequency of the dipole antenna is adjusted without a concentrated tuning piece except the base, and the problem that the existing flexible receiving coil is easy to bend and damage due to the fact that the tuning capacitor is adopted by the existing flexible receiving coil is avoided. Further, the antenna unit is of a flexible structure, so that the whole receiving antenna is easy to bend, the wearing comfort is good, and the workflow is simplified.
Description
Technical Field
The invention relates to the technical field of medical equipment, in particular to a receiving antenna assembly and a magnetic resonance device.
Background
In MR (Magnetic Resonance Imaging ) or PET-MR (PositronEmission Tomography-Magnetic Resonance Imaging, positron emission tomography-magnetic resonance imaging) systems, there is a radio frequency coil, which comprises a transmit coil and a receive coil, or a radio frequency coil that both transmits and receives.
Among the independent receiving coil, including being used for wrapping up the flexible receiving coil that laminates on one's body, but current flexible receiving coil adopts traditional antenna structure and circuit structure, and the volume is great and have certain weight, uses the bandage to fix flexible receiving coil on one's body by the scanning object in the scanning process, and flexible receiving coil still is provided with great mechanical shell in addition often, leads to the pendulum to be complicated, is scanned the wearing comfort level of object not good. Furthermore, in the conventional circuit structure, after the flexible receiving coil is wrapped, the space between the coil units in the flexible receiving coil can be changed, so that the decoupling effect of the conventional preamplifier cannot meet the requirement of any bending shape change, and the signal to noise ratio can be reduced, thereby influencing the image quality. In addition, the traditional flexible receiving coil is made of EVA materials, is limited by materials and processes, is thicker, and is matched with a traditional circuit structure, and a thicker mechanical shell is arranged in the middle of EVA to protect the circuit board inside, so that the whole flexible receiving coil is heavy and thick, and is inconvenient to package; in addition, the traditional antenna structure needs more tuning capacitors, and after the antenna structure is bent for multiple times, the capacitor bonding pads are easy to damage, so that the antenna structure is invalid.
Disclosure of Invention
The invention aims to provide a receiving antenna assembly and a magnetic resonance device, which are used for solving the problems of a flexible receiving coil in the prior art.
In order to solve the above technical problem, the present invention provides a receiving antenna assembly for a magnetic resonance device, the receiving antenna assembly comprising: at least one receiving antenna; the receiving antenna comprises a base and two antenna units;
one ends of the two antenna units are respectively connected with the base, the two antenna units form a first annular body with a first opening, and the other ends of the two antenna units are oppositely arranged and spaced by a first preset distance to form the first opening;
wherein the antenna unit is a flexible structure.
Optionally, the receiving antenna further includes a distribution cable, an extension direction of the distribution cable is the same as an extension direction of the antenna unit, a second annular body with a second opening is formed, and a second predetermined distance is spaced between the distribution cable and the antenna unit;
wherein the distribution cable is of flexible construction.
Optionally, in the receiving antenna assembly, the second annular body is located inside the first annular body, or the second annular body is located outside the first annular body.
Optionally, the number of the distribution cables is at least two, each distribution cable forms at least two second annular bodies respectively, and at least one second annular body is distributed on both inner and outer sides of the first annular body.
Optionally, in the receiving antenna assembly, the first opening is located at an end of the first annular body away from the base, and the second opening is located at an end of the second annular body close to the base.
Optionally, in the receiving antenna assembly, the second annular body formed by the distribution cable has at least two second openings.
Optionally, in the receiving antenna assembly, the length of each antenna unit is adapted to 1/4 wavelength corresponding to a preset operating frequency of the receiving antenna assembly.
Optionally, in the receiving antenna assembly, the base includes a preamplifier having an input impedance of not more than 0.5 Ω.
Optionally, the receiving antenna assembly includes more than two receiving antennas, and the first loops of the more than two receiving antennas overlap each other to form an array.
In order to solve the above technical problems, the present invention further provides a magnetic resonance apparatus, which includes the receiving antenna assembly as described above.
In summary, in the receiving antenna assembly and the magnetic resonance device provided by the present invention, the receiving antenna assembly includes: at least one receiving antenna; the receiving antenna comprises a base and two antenna units; one ends of the two antenna units are respectively connected with the base, the two antenna units form a first annular body with a first opening, and the other ends of the two antenna units are oppositely arranged and spaced by a first preset distance to form the first opening; wherein the antenna unit is a flexible structure.
The first annular body formed by the two antenna units is configured to form the dipole antenna, the structure is simple, the resonant frequency of the dipole antenna is adjusted without a concentrated tuning piece except the base, and the problem that the existing flexible receiving coil is easy to bend and damage due to the fact that the tuning capacitor is adopted by the existing flexible receiving coil is avoided. Further, the antenna unit is of a flexible structure, so that the whole receiving antenna is easy to bend, the wearing comfort is good, and the workflow is simplified. Furthermore, the signal to noise ratio can be effectively improved due to the good wrapping property of the receiving antenna.
Drawings
Those of ordinary skill in the art will appreciate that the figures are provided for a better understanding of the present invention and do not constitute any limitation on the scope of the present invention. Wherein:
fig. 1 is a schematic diagram of a dipole antenna;
fig. 2 is a schematic diagram of a receiving antenna according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a receiving antenna according to an embodiment of the present invention, which includes a distribution cable;
fig. 4 is a schematic diagram of a receiving antenna according to an embodiment of the present invention, which includes two distribution cables;
fig. 5 is a schematic diagram of a receiving antenna assembly according to an embodiment of the present invention, which includes 4 receiving antennas.
In the accompanying drawings:
01-an antenna radiator; 02-a PCB board;
10-receiving an antenna; 11-base; 12-an antenna unit; 120-a first opening; 13-distribution cable; 130-second opening.
Detailed Description
The invention will be described in further detail with reference to the drawings and the specific embodiments thereof in order to make the objects, advantages and features of the invention more apparent. It should be noted that the drawings are in a very simplified form and are not drawn to scale, merely for convenience and clarity in aiding in the description of embodiments of the invention. Furthermore, the structures shown in the drawings are often part of actual structures. In particular, the drawings are shown with different emphasis instead being placed upon illustrating the various embodiments.
As used in this specification, the singular forms "a," "an," and "the" include plural referents, the term "or" is generally used in the sense of comprising "and/or" and the term "several" is generally used in the sense of comprising "at least one," the term "at least two" is generally used in the sense of comprising "two or more," and the term "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying any relative importance or number of technical features indicated. Thus, a feature defining "first," "second," "third," or "third" may explicitly or implicitly include one or at least two such features, and the terms "one end" and "another end" and "proximal end" and "distal end" generally refer to the respective two portions, including not only the endpoints, but also the terms "mounted," "connected," "coupled," or "coupled" are to be construed broadly, e.g., as a fixed connection, as a removable connection, or as a single piece; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. Furthermore, as used in this specification, an element disposed on another element generally only means that there is a connection, coupling, cooperation or transmission relationship between the two elements, and the connection, coupling, cooperation or transmission between the two elements may be direct or indirect through an intermediate element, and should not be construed as indicating or implying any spatial positional relationship between the two elements, i.e., an element may be in any orientation such as inside, outside, above, below or on one side of the other element; as used in this specification, "upper", "lower", "high", "low", "top", "bottom" are to be understood as being located at relatively different positions from the ground based on the influence of gravity, unless the content clearly indicates otherwise. The specific meaning of the above terms in this specification will be understood by those of ordinary skill in the art in view of the specific circumstances.
The invention aims to provide a transmitting coil and a magnetic resonance device, which are used for solving the problem of low signal-to-noise ratio of the transmitting coil in the prior art.
The following description refers to the accompanying drawings.
Referring to fig. 1 to 5, fig. 1 is a schematic diagram of a dipole antenna; fig. 2 is a schematic diagram of a receiving antenna according to an embodiment of the present invention; FIG. 3 is a schematic diagram of a receiving antenna according to an embodiment of the present invention, which includes a distribution cable; fig. 4 is a schematic diagram of a receiving antenna according to an embodiment of the present invention, which includes two distribution cables; fig. 5 is a schematic diagram of a receiving antenna assembly according to an embodiment of the present invention, which includes 4 receiving antennas.
Fig. 1 shows a Dipole (Dipole) antenna comprising two coaxially arranged antenna radiators 01 and a PCB board 02, the two antenna radiators 01 protruding laterally opposite from both sides of the PCB board 02, and a balun (balun) and other matching elements of the antenna radiator 01 being integrated on the PCB board 02. A common dipole antenna is a half wave antenna, the total length of the two antenna radiators 01 of which is approximately half the operating wavelength. Dipole antennas are widely applied to high-field magnetic resonance transmitting antennas, but are rarely applied to receiving antennas, and the main reason is that the dipole antennas are half-wave resonant antennas, and considering the frequency of magnetic resonance, the dipole antennas have large general volumes and are difficult to be applied to the receiving antennas attached to scanned objects.
Based on the above analysis, the inventors have studied and found that the antenna unit can be reduced in volume by deforming the dipole antenna and can be applied to a receiving antenna. Thus, the present embodiment provides a receiving antenna assembly for a magnetic resonance device, please refer to fig. 2, the receiving antenna assembly includes at least one receiving antenna 10, the receiving antenna 10 includes a base 11 and two antenna units 12; one ends of the two antenna units 12 are respectively connected with the base 11, the two antenna units 12 form a first annular body with a first opening 120, and the other ends of the two antenna units 12 are oppositely arranged and spaced a first preset distance to form the first opening 120; wherein the antenna element 12 is of flexible construction.
Alternatively, the antenna unit 12 is made of a flexible wire that is relatively resistant to bending, and the first annular body formed by the antenna unit may be a regular shape such as a circular shape (as shown in fig. 2), a rectangular shape, a rounded rectangle or a polygonal shape, or may be an irregular shape, and the specific shape of the first annular body is not limited in this embodiment. The two antenna units 12 may be formed by bending two wires and respectively connected to the base 11 (e.g., welded), or the two antenna units 12 may be formed integrally with one wire and connected to the base 11 at the center thereof (e.g., welded). In one exemplary embodiment, as shown in fig. 2, the first loop formed by the two antenna elements 12 is generally circular, forming an open resonant loop, resembling a loop (loop) antenna, but unlike a loop antenna, the first loop has a first opening 120. The first predetermined distance at the first opening 120 may be calculated and set according to the predetermined frequency of use of the receiving antenna 10, the application location of the receiving antenna assembly, and other parameters, and may be adjusted according to actual needs by those skilled in the art. Preferably, the length of each of the antenna units 12 is adapted to 1/4 wavelength of the predetermined operating frequency of the receiving antenna assembly. The preset operating frequency may be determined according to the actual operating frequency of the receiving antenna 10, and the length of the antenna unit 12 may be the same as or similar to 1/4 wavelength corresponding to the actual operating frequency of the receiving antenna assembly.
Alternatively, the antenna element 12 may be secured to an insulative, flexible antenna skin (e.g., leather material, etc.) such that the shape of the first loop body and the first predetermined distance of the first opening 120 are substantially fixed. Since the antenna unit 12 has a flexible structure, it is difficult to maintain the shape of the antenna unit 12 in use unless other fixing members limit the shape thereof. In production, the antenna element 12 may be secured to an insulative, flexible antenna housing, and the first loop formed by the antenna element 12 may be substantially defined and formed, with the first predetermined distance also being substantially fixed. Of course, in use, the first loop will bend with the antenna sheath to wrap around a predetermined location (e.g., a location of the body, head, etc. waiting to be scanned). It will be appreciated that as the first loop bends with the antenna skin, the first predetermined distance will also change adaptively. The base 11 may, for example, include components such as a preamplifier and antenna matching or tuning circuitry, which may be coupled to the antenna element 12. Preferably, the pre-amplifier may employ a low input impedance pre-amplifier, for example having an input impedance of no more than 0.5 Ω. The specific structure of the base 11 can be suitably configured by a person skilled in the art according to the prior art, and will not be described here. So configured, the whole receiving antenna 10 has no tuning capacitor except the base 11, and has no other solid hard structure, so that the flexibility of the antenna unit 12 and the antenna sheath can ensure that the receiving antenna assembly can realize more laminated packaging at different parts (such as parts to be scanned such as legs, brains, ankles and the like) of a scanned object, and after the receiving antenna assembly is placed at a preset part to be scanned in use, the flexible antenna unit 12 and the antenna sheath are bent along with the form of the preset part to be scanned, thereby realizing laminated packaging, thereby improving the use flexibility of the receiving antenna assembly, improving the use comfort of the scanned object and effectively improving the signal to noise ratio. In addition, since the parts of the receiving antenna 10 except the base 11 have no other solid hard structures, the durability of the receiving antenna 10 under multiple bending is improved, and the problem that the existing flexible receiving coil is easy to fail due to multiple bending is solved.
The inventors have found that the frequency adjustment range of the receiving antenna 10 formed by simply using the two antenna elements 12 is limited even if the adjustable capacitance is provided on the base 11. Referring to fig. 3, in order to obtain a larger frequency adjustment range, the inventor further studies and found that a certain length of distribution cable 13 can be loaded around the antenna unit 12, a distributed capacitance can be generated between the loaded distribution cable 13 and the antenna unit 12, and the size of the distributed capacitance can be adjusted by adjusting the distance between the distribution cable 13 and the antenna unit 12, so that the frequency adjustment range of the receiving antenna 10 can be enlarged. Based on the above study, in an exemplary embodiment, the receiving antenna 10 further comprises a distribution cable 13, the distribution cable 13 extending in the same direction as the antenna unit 12, forming a second annular body with a second opening 130, the distribution cable 13 being spaced from the antenna unit 12 by a second predetermined distance, which is a fixed value determined during production, and which in use varies adaptively with bending of the distribution cable 13 and the antenna unit 12; wherein the distribution cable 13 is of flexible construction. Here, the fact that the extending direction of the distribution cable 13 is the same as the extending direction of the antenna unit 12 means that the distribution cable 13 is substantially parallel to the antenna unit 12. For example, in the example shown in fig. 3, the second annular body and the first annular body are both substantially circular. It should be noted that the second ring-shaped body must have at least one second opening 130, which must not be closed.
So configured, the receive antenna 10 may be tunable over a large frequency range. The distribution cable 13 may be made of a flexible wire that is more resistant to bending, such as a metal wire, and the distribution cable 13 may also be made of the same or similar material as the antenna unit 12. Likewise, the distribution cable 13 may be secured to the antenna sheath such that the shape of the second annular body, the position and size of the second opening 130, and the second predetermined distance are substantially fixed. Alternatively, the position and size of the second opening 130 and the second predetermined distance may be calculated and set according to the predetermined frequency of use of the receiving antenna 10 and other parameters, and those skilled in the art may adjust the position and size of the second opening 130 and the second predetermined distance according to actual needs. As shown in fig. 3, in one example, the second opening 130 of the distribution cable 13 is located at an end of the second annular body near the base 11. And, the first opening 120 of the first annular body formed by the two antenna units 12 is located at the end of the first annular body away from the base 11. The second opening 130 is staggered from the first opening 120, so that the capacitance distribution is more uniform, the distribution cable 13 and the base 11 are not contacted, the second opening 130 is close to the base 11 and can avoid the base 11, and the structure is convenient to realize. In practice, after the second predetermined distance is calculated and determined, the distribution cable 13 is fixed to the antenna housing, that is, a substantial frequency range of the receiving antenna 10 is determined, and further, the frequency of the receiving antenna 10 may be finely tuned by a tuning circuit or the like on the base 11. The tuning circuit may include components such as tunable capacitors, which may be configured by those skilled in the art in accordance with the prior art and will not be described herein.
In some embodiments, as shown in fig. 3, the second annular body is located within the first annular body. In other embodiments, the second annular body may also be located outside of the first annular body. Optionally, the second annular body formed by the distribution cable 13 is substantially on the same plane with the first annular body, and the second annular body may be optionally disposed inside or outside the first annular body. It should be noted that the number of distribution cables 13 is not limited to one, and the number of distribution cables 13 is not limited herein, for example, two or more distribution cables may be used, and the second annular body formed by the two or more distribution cables may be located entirely inside the first annular body, or entirely outside the first annular body.
In other embodiments, as shown in fig. 4, the number of the distribution cables 13 is at least two, each distribution cable 13 forms one second annular body, and at least one second annular body is distributed on both inner and outer sides of the first annular body. It will be appreciated that, in addition to or instead of the second annular body formed by distributing the cable 13 being entirely within the first annular body, the second annular body may also be distributed on both the inner and outer sides of the first annular body. The invention is not limited in this regard.
Referring to fig. 4, in an exemplary embodiment, the receiving antenna 10 includes two distribution cables 13, two second annular bodies formed by the two distribution cables 13 are respectively located at the inner side and the outer side of the first annular body, the two second annular bodies formed by the two distribution cables 13 are respectively provided with a second opening 130, and the second openings 130 of the two distribution cables 13 are located at one end of the second annular body near the base 11. And, the first opening 120 of the first annular body formed by the two antenna units 12 is located at the end of the first annular body away from the base 11. The second opening 130 is staggered from the first opening 120, so that the capacitance distribution is more uniform, the distribution cable 13 and the base 11 are not contacted, the second opening 130 is close to the base 11 and can avoid the base 11, and the structure is convenient to realize. It should be noted that the second opening 130 in the second annular body formed by the distribution cables 13 is not limited to one, and in an alternative embodiment, the second annular body formed by each distribution cable 13 has at least two second openings 130, so that the distribution cables 13 are easily arranged and fixed in manufacturing, and the second predetermined distance is easily adjusted. The number of second openings 130 and their location on the second annular body may be set as desired by those skilled in the art.
Optionally, in order to improve the non-uniformity of the rf field, the receiving antenna assembly includes more than two receiving antennas 10, so as to improve the detection accuracy. However, coupling may occur between two or more receiving antennas 10, and the first loop bodies of two or more receiving antennas 10 may be configured to overlap each other to form an array in order to improve decoupling performance. Referring to fig. 5, a receiving antenna assembly including 4 receiving antennas 10 is shown, wherein the 4 receiving antennas 10 form a 2×2 array, and the receiving antennas 10 of each row and column of the array are arranged in an overlapping manner, so that the acceleration performance and the image signal-to-noise ratio of the receiving antenna assembly can be improved. And further, the coupling problem between different channels of the receiving antenna assembly under different wrapping diameters is solved, and the applicability of the receiving antenna assembly to scanned objects of different sizes is improved.
Based on the receiving antenna assembly as described above, the present embodiment also provides a magnetic resonance apparatus, which includes the receiving antenna assembly as described above. Since the magnetic resonance apparatus provided in the present embodiment includes the receiving antenna assembly as described above, it also has the beneficial effects brought by the receiving antenna assembly as described above. It is to be understood that the principles and structures of other components of a magnetic resonance apparatus may be reasonably configured and understood by those skilled in the art, and the present invention will not be described herein.
In summary, in the receiving antenna assembly and the magnetic resonance device provided by the present invention, the receiving antenna assembly includes: at least one receiving antenna; the receiving antenna comprises a base and two antenna units; one ends of the two antenna units are respectively connected with the base, the two antenna units form a first annular body with a first opening, and the other ends of the two antenna units are oppositely arranged and spaced by a first preset distance to form the first opening; wherein the antenna unit is a flexible structure. The first annular body formed by the two antenna units is configured to form the dipole antenna, the structure is simple, the resonant frequency of the dipole antenna is adjusted without a concentrated tuning piece except the base, and the problem that the existing flexible receiving coil is easy to bend and damage due to the fact that the tuning capacitor is adopted by the existing flexible receiving coil is avoided. Further, the antenna unit is of a flexible structure, so that the whole receiving antenna is easy to bend, the wearing comfort is good, and the workflow is simplified. Furthermore, the signal to noise ratio can be effectively improved due to the good wrapping property of the receiving antenna.
The above description is only illustrative of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, and any alterations and modifications made by those skilled in the art based on the above disclosure shall fall within the scope of the appended claims.
Claims (9)
1. A receive antenna assembly for a magnetic resonance apparatus, comprising: at least one receiving antenna; the receiving antenna comprises a base and two antenna units;
the base comprises at least one of a preamplifier, an antenna matching circuit and a tuning circuit;
one ends of the two antenna units are respectively connected with the base, the two antenna units form a first annular body with a first opening, the other ends of the two antenna units are oppositely arranged and spaced by a first preset distance to form the first opening, the first opening is positioned at one end of the first annular body away from the base, and the first opening is opposite to the base;
wherein the antenna unit is of a flexible structure;
the receiving antenna further comprises a distribution cable, the extending direction of the distribution cable is the same as that of the antenna unit, a second annular body with a second opening is formed, and the distance between the second annular body and the first annular body is adjustable so as to enlarge the frequency adjusting range of the receiving antenna assembly;
the second opening is positioned at one end of the second annular body close to the base part, and the positions of the second opening and the first opening are staggered.
2. The receive antenna assembly of claim 1, wherein said distribution cable is spaced a second predetermined distance from said antenna element;
wherein the distribution cable is of flexible construction.
3. The receive antenna assembly of claim 2, wherein the second loop-shaped body is located inside the first loop-shaped body or the second loop-shaped body is located outside the first loop-shaped body.
4. The receiving antenna assembly of claim 2, wherein there are at least two distribution cables, each of the distribution cables forming a respective one of the second loops, at least one of the second loops being disposed on each of the inner and outer sides of the first loop.
5. The receive antenna assembly of claim 2 wherein said second loop formed by said distribution cable has at least two of said second openings.
6. The receive antenna assembly of claim 1, wherein a length of each of said antenna elements is adapted to 1/4 wavelength corresponding to a predetermined operating frequency of said receive antenna assembly.
7. The receive antenna assembly of claim 1, wherein the base comprises a preamplifier having an input impedance of no more than 0.5 Ω.
8. The receive antenna assembly of claim 1, comprising more than two of said receive antennas, said first loops of more than two of said receive antennas overlapping one another to form an array.
9. A magnetic resonance apparatus comprising a receive antenna assembly according to any one of claims 1 to 8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110525773.1A CN113253174B (en) | 2021-05-13 | 2021-05-13 | Receiving antenna assembly and magnetic resonance device |
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| CN202110525773.1A CN113253174B (en) | 2021-05-13 | 2021-05-13 | Receiving antenna assembly and magnetic resonance device |
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| CN113253174A CN113253174A (en) | 2021-08-13 |
| CN113253174B true CN113253174B (en) | 2023-06-16 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995012223A1 (en) * | 1993-10-28 | 1995-05-04 | Galtronics (U.K.) Limited | Antenna system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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