CN113433497B - A distributed capacitance magnetic resonance radio frequency transmitting coil structure - Google Patents
A distributed capacitance magnetic resonance radio frequency transmitting coil structure Download PDFInfo
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- CN113433497B CN113433497B CN202110728221.0A CN202110728221A CN113433497B CN 113433497 B CN113433497 B CN 113433497B CN 202110728221 A CN202110728221 A CN 202110728221A CN 113433497 B CN113433497 B CN 113433497B
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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
- G01R33/34007—Manufacture of RF coils, e.g. using printed circuit board technology; additional hardware for providing mechanical support to the RF coil assembly or to part thereof, e.g. a support for moving the coil assembly relative to the remainder of the MR system
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- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
本发明涉及磁共振技术领域，具体地说是一种分布式电容的磁共振射频发射线圈结构。一种分布式电容的磁共振射频发射线圈结构，包括绝缘介质层，其特征在于：所述的绝缘介质层呈鸟笼状结构；位于绝缘介质层的外表面均布设有若干设有外层导体，绝缘介质层的内表面均布设有若干内层导体；所述的外层导体及内层导体在绝缘介质层的内、外表面交错均匀分布，相邻的外层导体及内层导体之间设有交叠。同现有技术相比，提供一种分布式电容的磁共振射频发射线圈结构，能减少发射线圈壁厚、增加发射线圈内径、提高病人舒适度、成本低、图像质量好、安全性高、并能显著地降低线圈的重量，提高其柔软度，改善其可靠性。
The present invention relates to the field of magnetic resonance technology, and specifically to a magnetic resonance radio frequency transmitting coil structure of distributed capacitance. A magnetic resonance radio frequency transmitting coil structure of distributed capacitance includes an insulating dielectric layer, characterized in that: the insulating dielectric layer is in a birdcage-like structure; a plurality of outer conductors are evenly distributed on the outer surface of the insulating dielectric layer, and a plurality of inner conductors are evenly distributed on the inner surface of the insulating dielectric layer; the outer conductors and the inner conductors are staggered and evenly distributed on the inner and outer surfaces of the insulating dielectric layer, and overlaps are provided between adjacent outer conductors and inner conductors. Compared with the prior art, a magnetic resonance radio frequency transmitting coil structure of distributed capacitance is provided, which can reduce the wall thickness of the transmitting coil, increase the inner diameter of the transmitting coil, improve patient comfort, have low cost, good image quality, high safety, and can significantly reduce the weight of the coil, improve its softness, and improve its reliability.
Description
Technical Field
The invention relates to the technical field of magnetic resonance, in particular to a distributed capacitance magnetic resonance radio frequency transmitting coil structure.
Background
The magnetic resonance imaging is an advanced human body nondestructive imaging technology and is widely applied to diagnosis of diseases of various parts of a human body. The magnetic resonance transmitting coil is an important component of a magnetic resonance imaging system, 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 level of a patient. For clinical systems, the smaller the aperture, the more depressed the patient, the larger the aperture and the greater the patient comfort. For a high-field-strength small-aperture scientific magnetic resonance system, the smaller the space is, the fewer animals can be used for experiments, and the larger the space is, the more animals can be used for experiments. The weight, process control and cost control of the magnetic resonance transmit coil are all very important.
As shown in fig. 1, a conventional magnetic resonance radio frequency transmitting coil is formed by alternately arranging and connecting a plurality of lumped capacitors 1 (e.g., ceramic capacitors) and a plurality of segments of conductors 2 in sequence to form a birdcage transmitting coil, and the capacitors 1 and the conductors 2 are typically attached to an insulating medium 3. This presents several problems 1. The thickness of the capacitor 1 and the thickness of the plastic piece protecting the capacitor 1 increases 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 wall thickness of the transmitting coil is increased to reduce the inner diameter of the coil, so that the smaller the aperture is, the more the patient is pressed for a clinical system, and the smaller the space is, the smaller animals can be made for a high-field-strength small-aperture scientific magnetic resonance system, and the less the system faces to an experimental object.
Disclosure of Invention
The invention provides a distributed capacitance magnetic resonance radio frequency transmitting coil structure, which can reduce the wall thickness of the transmitting coil, increase the inner diameter of the transmitting coil, improve the comfort level of patients, lower the cost, improve the image quality and the safety, obviously reduce the weight of the coil, improve the softness and improve the reliability of the coil.
The magnetic resonance radio frequency transmitting coil structure of the distributed capacitor is characterized in that the insulating medium layer is of a birdcage-shaped structure, a plurality of outer layer conductors are uniformly distributed on the outer surface of the insulating medium layer, a plurality of inner layer conductors are uniformly distributed on the inner surface of the insulating medium layer, the outer layer conductors and the inner layer conductors 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 conductors and the adjacent inner layer conductors.
The adjacent outer layer conductor, inner layer conductor and insulating medium layer form a distributed capacitor, and a radio frequency transmitting coil is formed by combining a plurality of distributed capacitors.
The outer layer conductor and the inner layer conductor are of an I-shaped structure, and two ends of the adjacent outer layer conductor and two ends of the inner layer conductor are overlapped.
The outer layer conductors and the inner layer conductors are of T-shaped structures, adjacent outer layer conductors are distributed on the outer surface of the insulating medium layer in a staggered mode, adjacent inner layer conductors are distributed on the inner surface of the insulating medium layer in a staggered mode, and the adjacent outer layer conductors and the heads of the inner layer conductors are overlapped.
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 boards is used as the insulating medium layer, and the outer layer copper coating and the inner layer copper coating form the outer conductor and the inner layer conductor.
The printed circuit board adopts a double-sided glass fiber epoxy resin circuit board, a base material glass fiber epoxy resin of the printed circuit board is used as an insulating medium layer, and an outer layer copper coating and an inner layer copper coating form an outer layer conductor and an inner layer 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 coating and an inner layer copper coating form an outer layer conductor and an inner layer conductor.
Compared with the prior art, the invention provides the distributed capacitance magnetic resonance radio frequency transmitting coil structure, which can reduce the wall thickness of the transmitting coil, increase the inner diameter of the transmitting coil, improve the comfort level of patients, has low cost, good image quality and high safety, can obviously reduce the weight of the coil, improve the softness and improve the reliability of the coil.
The distributed capacitance-based magnetic resonance radio frequency transmitting coil structure reduces the wall thickness of the transmitting coil, and can be closer to the gradient coil, so that the inner diameter of the transmitting coil of the magnetic resonance system is increased, and the distributed capacitance-based magnetic resonance radio frequency transmitting coil structure has great advantages in a small-aperture high-field animal magnetic resonance system.
The invention increases the aperture of the transmitting coil, improves the comfort of patients, and increases the experimental range for the high-field-intensity small-aperture scientific research magnetic resonance system.
Drawings
Fig. 1 is a schematic diagram of a conventional magnetic resonance radio frequency transmitting coil.
FIG. 2 is a schematic diagram 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 invention is further described below with reference to the accompanying drawings.
As shown in fig. 2 to 5, the insulating medium layer 6 is in a birdcage structure, a plurality of outer layer conductors 4 are uniformly distributed on the outer surface of the insulating medium layer 6, a plurality of inner layer conductors 5 are uniformly distributed on the inner surface of the insulating medium layer 6, the outer layer conductors 4 and the inner layer conductors 5 are uniformly distributed on the inner surface and the outer surface of the insulating medium layer 6 in a staggered manner, and overlapping is arranged between the adjacent outer layer conductors 4 and the adjacent inner layer conductors 5.
The adjacent outer layer conductor 4, inner layer conductor 5 and insulating medium layer 6 form a distributed capacitor, and a radio frequency transmitting coil is formed by combining a plurality of distributed capacitors.
The outer layer conductor 4 and the inner layer conductor 5 are of an I-shaped structure, and two ends of the adjacent outer layer conductor 4 and two ends of the inner layer conductor 5 are overlapped.
The outer layer conductors 4 and the inner layer conductors 5 are of T-shaped structures, adjacent outer layer conductors 4 are distributed on the outer surface of the insulating medium layer 6 in a staggered mode, adjacent inner layer conductors 5 are distributed on the inner surface of the insulating medium layer 6 in a staggered mode, and the adjacent outer layer conductors 4 and the head portions of the inner layer conductors 5 overlap.
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 boards is used as the insulating medium layer 6, and the outer copper coating and the inner copper coating form the outer conductor 4 and the inner conductor 5.
The printed circuit board adopts a double-sided glass fiber epoxy resin circuit board, a base material glass fiber epoxy resin of the printed circuit board is used as an insulating medium layer 6, and an outer layer copper coating and an inner layer copper coating form an outer layer conductor 4 and an inner layer conductor 5.
The printed circuit board adopts a flexible polyimide double-sided circuit board, wherein polyimide which is a base material of the printed circuit board is used as an insulating medium layer 6, and an outer layer copper coating and an inner layer copper coating form an outer layer conductor 4 and an inner layer conductor 5.
In example 1 of the invention, as shown in fig. 2 and 3, the birdcage-shaped transmitting coil has 16 distributed capacitors at each end, a total of 32 distributed capacitors, no ceramic capacitor, and the insulating dielectric layer 6 is a 50um thick FR4 substrate.
The outer layer conductor 4 and the inner layer conductor 5 are both in an I shape and uniformly distributed on the birdcage-shaped insulating medium layer 6. The number of outer conductors 4 is 8, the number of inner conductors 5 is 8, the inner conductors are respectively and mutually staggered on the inner surface and the outer surface of the birdcage-shaped insulating medium layer 6, and 16 distributed capacitors are respectively formed at the two ends of the birdcage.
In the embodiment 2 of the invention, as shown in fig. 4 and 5, the birdcage-shaped transmitting coil has 16 distributed capacitors at each end, 16 distributed capacitors are arranged in the middle of the birdcage, 48 distributed capacitors are all arranged, no ceramic capacitor exists, and the insulating medium layer 6 is polyimide with the thickness of 50 um.
The outer layer conductor 4 and the inner layer conductor 5 are both T-shaped and uniformly distributed on the birdcage-shaped insulating medium layer 6. The number of the outer layer conductors 4 is 16 (8 at each end), the number of the inner layer conductors 5 is 16 (8 at each end), the inner layer conductors are respectively and mutually staggered on the inner surface and the outer surface of the birdcage-shaped insulating medium layer 6, 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 overlap in the middle of the birdcage to form a distributed capacitance for a total of 16 distributed capacitances.
The conductors of the inductance and the distributed capacitance in the magnetic resonance radio frequency transmitting coil structure can be in other shapes, or the base material of other printed circuit boards is used as an insulating medium layer, and radio frequency transmitting coil structures with different sizes, shapes and working frequencies can be manufactured easily by using the same thought.
The present invention thus uses a number of mutually unconnected conductors, but the conductors are no longer connected by separate lumped ceramic capacitors, but rather distributed capacitors are formed by the conductors. The conductors form an inductor on one hand and also participate in forming a distributed capacitor, 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 the magnetic resonance radio frequency signals can be effectively detected.
Therefore, the structure of the invention does not need to use ceramic capacitor, 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 softness and improves the reliability of the flexible coil.
In conclusion, the structure of the invention reduces 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 particularly has great advantages on a high-field animal magnetic resonance system with small aperture. The invention increases the aperture of the transmitting coil, improves the comfort of patients, and increases the experimental range for the high-field-intensity small-aperture scientific research magnetic resonance system. 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 softness, improving the reliability, ingenious design, simple structure and simple production process, and is suitable for large-scale popularization and application.
Claims (4)
1. The magnetic resonance radio frequency transmitting coil structure of the distributed capacitor comprises an insulating medium layer and is characterized in that the insulating medium layer (6) is of a birdcage-shaped structure, a plurality of outer layer conductors (4) are uniformly distributed on the outer surface of the insulating medium layer (6), a plurality of inner layer conductors (5) are uniformly distributed on the inner surface of the insulating medium layer (6), the outer layer conductors (4) and the inner layer conductors (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 conductors (4) and the inner layer conductors (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 boards is used as the insulating medium layer (6), and the outer layer copper coating and the inner layer copper coating form the outer conductor (4) and the inner layer conductor (5);
the outer layer conductors (4) and the inner layer conductors (5) are of an I-shaped structure, and two ends of the adjacent outer layer conductors (4) and two ends of the inner layer conductors (5) are overlapped;
Or the outer layer conductors (4) and the inner layer conductors (5) are of T-shaped structures, the adjacent outer layer conductors (4) are distributed on the outer surface of the insulating medium layer (6) in a staggered mode, the adjacent inner layer conductors (5) are distributed on the inner surface of the insulating medium layer (6) in a staggered mode, and the adjacent outer layer conductors (4) and the heads of the inner layer conductors (5) are overlapped.
2. The structure of claim 1, wherein the adjacent outer conductor (4), inner conductor (5) and insulating medium layer (6) form a distributed capacitor, and the distributed capacitors are combined to form the RF transmitting coil.
3. The magnetic resonance radio frequency transmitting coil structure of the distributed capacitor as set forth in claim 1, wherein the printed circuit board is a double-sided glass fiber epoxy resin circuit board, a base material glass fiber epoxy resin of the printed circuit board is used as an insulating medium layer (6), and an outer layer copper coating and an inner layer copper coating form an outer layer conductor (4) and an inner layer conductor (5).
4. The distributed capacitor magnetic resonance radio frequency transmitting coil structure as claimed in claim 1, wherein the printed circuit board is a flexible polyimide double-sided circuit board, a base material polyimide of the printed circuit board is used as an insulating medium layer (6), and an outer layer copper coating and an inner layer copper coating form an outer layer conductor (4) and an inner layer conductor (5).
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| CN202110728221.0A CN113433497B (en) | 2021-06-29 | 2021-06-29 | A distributed capacitance magnetic resonance radio frequency transmitting coil structure |
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| CN202110728221.0A CN113433497B (en) | 2021-06-29 | 2021-06-29 | A distributed capacitance magnetic resonance radio frequency transmitting coil structure |
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| CN113433497A CN113433497A (en) | 2021-09-24 |
| CN113433497B true CN113433497B (en) | 2025-04-29 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN215449562U (en) * | 2021-06-29 | 2022-01-07 | 上海辰光医疗科技股份有限公司 | Magnetic resonance radio frequency transmitting coil structure of distributed capacitor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1969194A (en) * | 2004-06-18 | 2007-05-23 | 皇家飞利浦电子股份有限公司 | Low local SAR birdcage radio frequency coil |
| US9157971B2 (en) * | 2012-01-05 | 2015-10-13 | General Electric Company | Distributed capacitance radio frequncy (RF) coil and magnetic resonance imaging system including the same |
| KR101424976B1 (en) * | 2012-11-08 | 2014-08-13 | 삼성전자주식회사 | Phased array RF coil for magnetic resonance imaging |
| DE102016212018A1 (en) * | 2016-07-01 | 2018-01-04 | Bruker Biospin Ag | RF coil assembly |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN215449562U (en) * | 2021-06-29 | 2022-01-07 | 上海辰光医疗科技股份有限公司 | Magnetic resonance radio frequency transmitting coil structure of distributed capacitor |
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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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