CN215449562U - Magnetic resonance radio frequency transmitting coil structure of distributed capacitor - Google Patents
Magnetic resonance radio frequency transmitting coil structure of distributed capacitor Download PDFInfo
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- CN215449562U CN215449562U CN202121457644.5U CN202121457644U CN215449562U CN 215449562 U CN215449562 U CN 215449562U CN 202121457644 U CN202121457644 U CN 202121457644U CN 215449562 U CN215449562 U CN 215449562U
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Abstract
The utility model relates to the technical field of magnetic resonance, in particular to a magnetic resonance radio frequency transmitting coil structure with distributed capacitors. A distributed capacitance magnetic resonance radio frequency transmitting coil structure comprises an insulating medium layer, and is characterized in that: the insulating medium layer is in a birdcage structure; a plurality of outer-layer conductors are uniformly distributed on the outer surface of the insulating medium layer, and a plurality of inner-layer conductors are uniformly distributed on the inner surface of the insulating medium layer; the outer layer conductor and the inner layer conductor are uniformly distributed on the inner surface and the outer surface of the insulating medium layer in a staggered mode, and overlapping is arranged between the adjacent outer layer conductor and the adjacent inner layer conductor. Compared with the prior art, the magnetic resonance radio frequency transmitting coil structure with the distributed capacitors can reduce the wall thickness of the transmitting coil, increase the inner diameter of the transmitting coil, improve the comfort of a patient, has low cost, good image quality and high safety, can obviously reduce the weight of the coil, improve the flexibility of the coil and improve the reliability of the coil.
Description
Technical Field
The utility model relates to the technical field of magnetic resonance, in particular to a magnetic resonance radio frequency transmitting coil structure with distributed capacitors.
Background
Magnetic resonance imaging is an advanced technique for non-destructive imaging of the human body and is widely applied to diagnosis of diseases of various parts of the human body. The performance of the magnetic resonance transmitting coil directly determines the quality of magnetic resonance imaging, and the size of the inner diameter of the transmitting coil has great influence on the size of an imaging area and the comfort of a patient. For clinical systems, the smaller the bore size, the more depressed the patient, and the larger the bore size, the more comfortable the patient. For a high-field small-aperture scientific research magnetic resonance system, the smaller the space is, the fewer animals can be tested, and the larger the space is, the more animals can be tested. The weight, process control, and cost control of the magnetic resonance transmit coil are all important.
As shown in fig. 1, a conventional magnetic resonance radio frequency transmission coil is formed by alternately arranging and connecting a plurality of lumped capacitors 1 (e.g., ceramic capacitors) and a plurality of conductors 2 in sequence, and these capacitors 1 and conductors 2 are usually attached to an insulating medium 3. This presents several problems: 1. the thickness of the capacitor 1 and the thickness of the plastic part protecting the capacitor 1 increase the thickness of the transmitting coil, thereby reducing the inner diameter of the transmitting coil. 2. The cost of the capacitor 1 for the transmitting coil is relatively high. 3. The increased wall thickness of the transmit coil results in a decrease in the coil inner diameter, the smaller the bore diameter, the more depressed the patient for a clinical system; for a high-field small-aperture scientific research magnetic resonance system, the smaller the space is, the smaller the animals can be made, and the fewer the system faces to experimental objects.
Disclosure of Invention
The utility model provides a distributed capacitance magnetic resonance radio frequency transmitting coil structure for overcoming the defects of the prior art, which can reduce the wall thickness of the transmitting coil, increase the inner diameter of the transmitting coil, improve the comfort of patients, has low cost, good image quality and high safety, can obviously reduce the weight of the coil, improve the flexibility and improve the reliability of the coil.
In order to achieve the purpose, the magnetic resonance radio frequency transmitting coil structure with the distributed capacitor comprises an insulating medium layer, and is characterized in that: the insulating medium layer is in a birdcage structure; a plurality of outer-layer conductors are uniformly distributed on the outer surface of the insulating medium layer, and a plurality of inner-layer conductors are uniformly distributed on the inner surface of the insulating medium layer; the outer layer conductor and the inner layer conductor are uniformly distributed on the inner surface and the outer surface of the insulating medium layer in a staggered mode, and overlapping is arranged between the adjacent outer layer conductor and the adjacent inner layer conductor.
The adjacent outer layer conductor, the inner layer conductor and the insulating medium layer form a distributed capacitor, and a plurality of distributed capacitors are combined to form the radio frequency transmitting coil.
The outer conductor and the inner conductor are in I-shaped structures, and two ends of the adjacent outer conductor and two ends of the adjacent inner conductor are overlapped.
The outer layer conductor and the inner layer conductor are of T-shaped structures, and the adjacent outer layer conductors are distributed on the outer surface of the insulating medium layer in a mutually staggered manner; the adjacent inner-layer conductors are distributed on the inner surface of the insulating medium layer in a mutually staggered manner; the adjacent outer conductor overlaps the head of the inner conductor.
The outer conductor, the inner conductor and the insulating medium layer are all double-sided printed circuit boards, the base material of the printed circuit board is used as the insulating medium layer, and the outer conductor and the inner conductor are formed by copper plating on the outer layer and copper plating on the inner layer.
The printed circuit board adopts a double-sided glass fiber epoxy resin circuit board, the base material glass fiber epoxy resin of the printed circuit board is used as an insulating medium layer, and an outer layer is coated with copper and an inner layer is coated with copper to form an outer conductor and an inner conductor.
The printed circuit board adopts a flexible polyimide double-sided circuit board, the base material polyimide of the printed circuit board is used as an insulating medium layer, and an outer layer copper-clad layer and an inner layer copper-clad layer form an outer layer conductor and an inner layer conductor.
Compared with the prior art, the utility model provides the magnetic resonance radio frequency transmitting coil structure with the distributed capacitors, which can reduce the wall thickness of the transmitting coil, increase the inner diameter of the transmitting coil, improve the comfort of patients, has low cost, good image quality and high safety, can obviously reduce the weight of the coil, improve the flexibility and improve the reliability.
The utility model uses the magnetic resonance radio frequency transmitting coil structure of the distributed capacitance to reduce the wall thickness of the transmitting coil, and can be closer to the gradient coil, thereby increasing the inner diameter of the transmitting coil of the magnetic resonance system, and having great advantages particularly on a high-field animal magnetic resonance system with small aperture.
The utility model increases the aperture of the transmitting coil, and improves the comfort of the patient; for a high-field-strength small-aperture scientific research magnetic resonance system, the experimental range is increased.
Drawings
Figure 1 is a schematic diagram of a conventional magnetic resonance radio frequency transmit coil configuration.
FIG. 2 is a schematic view of the structure of the present invention.
FIG. 3 is a top view of the structure of the present invention.
Fig. 4 is a schematic structural diagram of another embodiment of the present invention.
Fig. 5 is a partial schematic view of fig. 4.
Referring to fig. 1 to 5, 1 is a capacitor, 2 is a conductor, 3 is an insulating medium, 4 is an outer conductor, 5 is an inner conductor, and 6 is an insulating medium layer.
Detailed Description
The utility model is further illustrated below with reference to the accompanying drawings.
As shown in fig. 2 to 5, the insulating medium layer 6 has a birdcage structure; a plurality of outer-layer conductors 4 are uniformly distributed on the outer surface of the insulating medium layer 6, and a plurality of inner-layer conductors 5 are uniformly distributed on the inner surface of the insulating medium layer 6; the outer layer conductor 4 and the inner layer conductor 5 are uniformly distributed on the inner surface and the outer surface of the insulating medium layer 6 in a staggered mode, and overlapping is arranged between the adjacent outer layer conductor 4 and the inner layer conductor 5.
The adjacent outer conductor 4, inner conductor 5 and insulating medium layer 6 form a distributed capacitor, and a plurality of distributed capacitors are combined to form the radio frequency transmitting coil.
The outer conductor 4 and the inner conductor 5 are in I-shaped structures, and two ends of the adjacent outer conductor 4 and two ends of the adjacent inner conductor 5 are overlapped.
The outer layer conductor 4 and the inner layer conductor 5 are in a T-shaped structure, and the adjacent outer layer conductors 4 are mutually staggered and distributed on the outer surface of the insulating medium layer 6; the adjacent inner layer conductors 5 are distributed on the inner surface of the insulating medium layer 6 in a mutually staggered way; the adjacent outer conductor 4 overlaps the head of the inner conductor 5.
The outer conductor 4, the inner conductor 5 and the insulating medium layer 6 are all double-sided printed circuit boards, the base material of the printed circuit board is made of the insulating medium layer 6, and the outer conductor 4 and the inner conductor 5 are formed by copper plating on the outer layer and copper plating on the inner layer.
The printed circuit board adopts a double-sided glass fiber epoxy resin circuit board, the base material glass fiber epoxy resin of the printed circuit board is used as an insulating medium layer 6, and an outer layer is coated with copper and an inner layer is coated with copper to form an outer layer conductor 4 and an inner layer conductor 5.
The printed circuit board adopts a flexible polyimide double-sided circuit board, the base material polyimide of the printed circuit board is used as an insulating medium layer 6, and an outer layer copper-clad layer and an inner layer copper-clad layer form an outer layer conductor 4 and an inner layer conductor 5.
Inventive example 1, as shown in fig. 2 and 3, each end of the birdcage-shaped transmitting coil has 16 distributed capacitors, and there are 32 distributed capacitors in total, and the insulating dielectric layer 6 is a FR4 substrate 50um thick.
The outer conductor 4 and the inner conductor 5 are in an I shape and are uniformly distributed on the birdcage-shaped insulating medium layer 6. The number of the outer conductors 4 is 8, the number of the inner conductors 5 is 8, the outer conductors and the inner conductors are respectively positioned on the inner surface and the outer surface of the birdcage-shaped insulating medium layer 6 in a staggered mode, and 16 distributed capacitors are respectively formed at two ends of the birdcage.
In embodiment 2 of the present invention, as shown in fig. 4 and 5, the two ends of the birdcage-shaped transmission coil are respectively provided with 16 distributed capacitors, the middle of the birdcage is provided with 16 distributed capacitors, and a total of 48 distributed capacitors are provided without any ceramic capacitor, and the insulating medium layer 6 is polyimide 50um thick.
The outer conductor 4 and the inner conductor 5 are both T-shaped and are uniformly distributed on the birdcage-shaped insulating medium layer 6. The number of the outer conductors 4 is 16 (8 at each end), the number of the inner conductors 5 is 16 (8 at each end), the outer conductors and the inner conductors are respectively positioned on the inner surface and the outer surface of the birdcage-shaped insulating medium layer 6 in a staggered mode, and 16 distributed capacitors are respectively formed at the two ends of the birdcage. The outer conductor 4 at one end and the inner conductor 5 at the other end are overlapped in the middle of the birdcage to form distributed capacitors, and 16 distributed capacitors are formed in total.
The part of conductors of the inductor and the distributed capacitor in the magnetic resonance radio frequency transmitting coil structure can also be in other shapes, or the base materials of other printed circuit boards are used as insulating medium layers, and the radio frequency transmitting coil structure with different sizes, shapes and working frequencies can be easily manufactured by the same idea.
Therefore, the utility model uses several unconnected conductors, but the independent lumped ceramic capacitor connection is not used between the conductors, but the conductors are used to form distributed capacitance. The conductors form an inductance on one hand and participate in forming a distributed capacitance at the same time, the resonant frequency of the conductors can be adjusted by adjusting the length, the width, the relative position and the like of the conductors, and when the resonant frequency is equal to the frequency of the magnetic resonance signals, the radio frequency signals can be effectively transmitted and detected.
Therefore, the structure of the utility model does not need to use ceramic capacitors, reduces the thickness of the transmitting coil, increases the inner diameter of the transmitting coil, has simple production process, low cost and convenient debugging, can obviously reduce the weight of the flexible coil, improves the flexibility and improves the reliability of the flexible coil.
In conclusion, the structure of the utility model reduces the wall thickness of the transmitting coil, can be closer to the gradient coil, thereby increasing the inner diameter of the transmitting coil of the magnetic resonance system, and has great advantages particularly on a high-field animal magnetic resonance system with small aperture. The utility model increases the aperture of the transmitting coil, and improves the comfort of the patient; for a high-field-strength small-aperture scientific research magnetic resonance system, the experimental range is increased. The magnetic resonance radio frequency transmitting coil using the distributed capacitor has the advantages of low structure cost, good image quality, high safety, capability of remarkably reducing the weight of the coil, improving the flexibility and the reliability, ingenious design, simple structure and simple production process, and is suitable for large-scale popularization and application.
Claims (7)
1. A distributed capacitance magnetic resonance radio frequency transmitting coil structure comprises an insulating medium layer, and is characterized in that: the insulating medium layer (6) is of a birdcage structure; a plurality of outer-layer conductors (4) are uniformly distributed on the outer surface of the insulating medium layer (6), and a plurality of inner-layer conductors (5) are uniformly distributed on the inner surface of the insulating medium layer (6); the outer layer conductor (4) and the inner layer conductor (5) are uniformly distributed on the inner surface and the outer surface of the insulating medium layer (6) in a staggered mode, and overlapping is arranged between the adjacent outer layer conductor (4) and the adjacent inner layer conductor (5).
2. A distributed capacitive magnetic resonance radio frequency transmit coil structure as claimed in claim 1, wherein: the adjacent outer conductor (4), the inner conductor (5) and the insulating medium layer (6) form a distributed capacitor, and a plurality of distributed capacitors are combined to form the radio frequency transmitting coil.
3. A distributed capacitive magnetic resonance radio frequency transmit coil structure as claimed in claim 1 or 2, wherein: the outer conductor (4) and the inner conductor (5) are in I-shaped structures, and two ends of the adjacent outer conductor (4) and two ends of the adjacent inner conductor (5) are overlapped.
4. A distributed capacitive magnetic resonance radio frequency transmit coil structure as claimed in claim 1 or 2, wherein: the outer layer conductor (4) and the inner layer conductor (5) are of T-shaped structures, and the adjacent outer layer conductors (4) are distributed on the outer surface of the insulating medium layer (6) in a mutually staggered manner; the adjacent inner layer conductors (5) are distributed on the inner surface of the insulating medium layer (6) in a mutually staggered manner; the adjacent outer conductor (4) overlaps the head of the inner conductor (5).
5. A distributed capacitive magnetic resonance radio frequency transmit coil structure as claimed in claim 1 or 2, wherein: the outer conductor (4), the inner conductor (5) and the insulating medium layer (6) are all double-sided printed circuit boards, the base material of the printed circuit board is used as the insulating medium layer (6), and the outer conductor (4) and the inner conductor (5) are formed by copper plating on the outer layer and copper plating on the inner layer.
6. A distributed capacitive magnetic resonance radio frequency transmit coil structure as claimed in claim 5, wherein: the printed circuit board adopts a double-sided glass fiber epoxy resin circuit board, the base material glass fiber epoxy resin of the printed circuit board is used as an insulating medium layer (6), and an outer layer is coated with copper and an inner layer is coated with copper to form an outer conductor (4) and an inner conductor (5).
7. A distributed capacitive magnetic resonance radio frequency transmit coil structure as claimed in claim 5, wherein: the printed circuit board adopts a flexible polyimide double-sided circuit board, the base material polyimide of the printed circuit board is used as an insulating medium layer (6), and an outer layer is coated with copper and an inner layer is coated with copper to form an outer conductor (4) and an inner conductor (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121457644.5U CN215449562U (en) | 2021-06-29 | 2021-06-29 | Magnetic resonance radio frequency transmitting coil structure of distributed capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121457644.5U CN215449562U (en) | 2021-06-29 | 2021-06-29 | Magnetic resonance radio frequency transmitting coil structure of distributed capacitor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215449562U true CN215449562U (en) | 2022-01-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121457644.5U Active CN215449562U (en) | 2021-06-29 | 2021-06-29 | Magnetic resonance radio frequency transmitting coil structure of distributed capacitor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215449562U (en) |
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2021
- 2021-06-29 CN CN202121457644.5U patent/CN215449562U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information |
Inventor after: Tao Shiliang Inventor after: Xie Rui Inventor after: Zhang Songtao Inventor after: He Jun Inventor before: Tao Shiliang Inventor before: Xie Rui Inventor before: Zhang Songtao Inventor before: He Jun |
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| CB03 | Change of inventor or designer information |