CN111273206B - Magnetic resonance radio frequency array coil and device and magnetic resonance imaging method - Google Patents
Magnetic resonance radio frequency array coil and device and magnetic resonance imaging method Download PDFInfo
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- 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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- 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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- 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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- 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
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- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
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Abstract
The magnetic resonance radio frequency array coil comprises a first coil unit, a second coil unit, a third coil unit, a fourth coil unit, a fifth coil unit and a sixth coil unit which are sequentially and partially overlapped along the annular direction, wherein the first coil unit and the sixth coil unit are partially overlapped to form a closed ring formed by the first coil unit, the second coil unit, the third coil unit, the fourth coil unit, the fifth coil unit and the sixth coil unit, a seventh coil unit partially overlapped with the first coil unit, the second coil unit, the third coil unit and the sixth coil unit and an eighth coil unit partially overlapped with the third coil unit, the fourth coil unit, the fifth coil unit and the sixth coil unit are arranged on the inner side of the closed ring, and the seventh coil unit is partially overlapped with the eighth coil unit. The image signal-to-noise ratio of the central area of the array coil and the uniformity of the whole image can be improved.
Description
Technical Field
The application relates to a magnetic resonance radio frequency array coil, a magnetic resonance radio frequency array device and a magnetic resonance imaging method.
Background
The magnetic resonance imaging technology has become an important means of modern medical clinical diagnosis, has the advantages of higher tissue density contrast, capability of performing slice imaging in any direction and no ionizing radiation, and is increasingly widely applied.
The radio frequency receiving coil is an important part of an imaging system, is positioned at the forefront end of a receiving chain, plays a significant role in the imaging quality and directly influences the quality of the imaging quality. Meanwhile, the radio frequency coil is easier to develop and optimize than other components in the magnetic resonance system, and therefore, the radio frequency coil is always a hot spot in the field of magnetic resonance imaging. The number of units (channels) of the coil is the main hot spot, but is limited by the number of receiving channels of the system, because the number of channels of the radio frequency coil in the receiving state at the same time cannot be larger than the number of receiving channels of the system; therefore, when the number of coil channels is limited, optimizing the layout of the coil units can also obviously improve the performance of the coil.
When the number of coil units is greater than or equal to 2, the coil unit is called an array coil. When any 2 units are relatively close to each other, mutual influence, namely coupling between coil units, can be generated. For the array coil, the coupling is a negative factor, which has a certain influence on the coil performance, and the larger the coupling is, the larger the negative influence is, so decoupling means is often needed between units to improve the coil performance.
The ways of decoupling can be summarized as 4:
1. partial Overlap (Overlap) decoupling: this is the preferred way of decoupling between 2 cells, but is generally only possible between 2 adjacent cells.
2. Inductance decoupling: 2 units are respectively connected with an inductor in series, and the 2 inductors are mutually overlapped and coupled, so that a reverse coupling can be generated to offset the coupling of the 2 units. This decoupling has the disadvantage that the series inductance reduces the efficiency of the coil unit to some extent, resulting in a reduction of the performance of the individual units and further in a reduction of the performance of the entire coil.
3. Decoupling the capacitor: one or more common capacitors are added among the 2 units, and the reverse coupling can be generated at the end 2 of the capacitor to counteract the coupling of the 2 units. This way the properties of the magnetic resonance radio frequency excitation field are influenced to some extent and in the end some aspects may be influenced.
4. Front-end decoupling: in the radio frequency receiving coil, each unit is followed by a preamplifier, the preamplifier is designed to have a decoupling function, but the decoupling function of the preamplifier is limited, and the effect of decoupling by the preamplifier is not ideal for 2 coil units with stronger original coupling.
In summary, in the other 3 decoupling modes, the partial Overlap (Overlap) decoupling mode is the best mode, and the decoupling effect is good and generally has no negative effect.
In addition, from the development history and direction of the magnetic resonance industry, the number of channels of the system generally adopts the convention of 2 to the integral power, namely, 1 channel is increased to 2 channels, then 4 channels are increased, then 8 channels are increased, then 16 channels are increased, and the like.
Currently, 8 or 16 channel magnetic resonance radio frequency systems are the major popularity of the industry, which should be a mainstream configuration even in the foreseeable future. Based on this, the radio frequency coils with 8 channels are more various, such as 8-channel head coils, 8-channel knee joint coils, 8-channel shoulder joint coils, 8-channel abdomen (trunk) coils, and so on.
In an 8-channel coil, a common unit distribution mode is a mode that 8 units are sequentially arranged from left to right, and as shown in fig. 1, the mode is simple and intuitive. There are often 2 distinct disadvantages that impair its range of application and usefulness.
1. The size of the uniform field area and the size of the target imaging area are limited, the unit shape is often slightly prolate, the length-width ratio is slightly large, and compared with a more square or even circular coil unit, the receiving efficiency of the coil unit is not high, and the performance is limited.
2. The decoupling between the cells is not ideal: although any 2 adjacent cells can be decoupled in a partially overlapping (Overlap) manner, some sub-adjacent cells (such as cell 1 and cell 3) are not well decoupled, and even more sub-adjacent cells (such as cell 1 and cell 4) are not coupled negligibly, but there is no proper decoupling. Resulting in further limited performance of the entire array coil.
Another, and very common, distribution is a 2 x 4 arrangement of cells, as shown in figure 2. The 8 coil units are divided into 2 rows of 4. The arrangement mode is visual, the characteristic that the unit is too long and flat can be avoided to a certain extent, and the efficiency of the unit is improved. But also has its corresponding drawbacks:
1. the decoupling between the cells is still not ideal: because of the close location and the large coupling between diagonally adjacent cells (such as cells 2 and 7), there is still a negative effect that the capacitive or inductive decoupling is often relied on.
2. Seen along the main magnetic field direction, the central part of the whole coil is the superposition junction of 2 groups of coils, and the image signal-to-noise ratio is a relative weak link compared with the peripheral part. The central site is often the most important focal region of concern and importance to the clinician. This snr weakness occurs in the most important areas and is a relatively large design pitot.
Disclosure of Invention
The purpose of the application is: in view of the above problems, a magnetic resonance radio frequency array coil, a device and a magnetic resonance imaging method are provided, which aim to improve the decoupling performance between units of the array coil and the image signal to noise ratio of the central area.
The technical scheme of the application is as follows:
a magnetic resonance radio frequency array coil comprises a first coil unit, a second coil unit, a third coil unit, a fourth coil unit, a fifth coil unit and a sixth coil unit which are sequentially and partially overlapped along the annular direction, wherein the first coil unit and the sixth coil unit are also partially overlapped, thereby forming a closed loop constituted by the first coil unit, the second coil unit, the third coil unit, the fourth coil unit, the fifth coil unit and the sixth coil unit, the inner side of the closed ring is provided with a seventh coil unit partially overlapped with the first coil unit, the second coil unit, the third coil unit and the sixth coil unit and an eighth coil unit partially overlapped with the third coil unit, the fourth coil unit, the fifth coil unit and the sixth coil unit, and the seventh coil unit and the eighth coil unit are partially overlapped.
On the basis of the above technical solutions, the magnetic resonance radio frequency array coil of the present application further includes the following preferred solutions:
the third coil unit, the seventh coil unit and the eighth coil unit have a common overlapping area.
The sixth coil unit, the seventh coil unit and the eighth coil unit have a common overlapping area.
The first coil unit, the second coil unit and the seventh coil unit have a common overlapping area.
The fourth coil unit, the fifth coil unit and the eighth coil unit have a common overlapping area.
The outer contour of the closed ring is rectangular.
A magnetic resonance imaging method arranges the magnetic resonance radio frequency array coil of the structure on the side of an imaged part.
On the basis of the above technical solutions, the magnetic resonance imaging method of the present application further includes the following preferred solutions:
the two sides of the imaged part are respectively provided with a magnetic resonance radio frequency array coil with the structure.
The normal directions of the first coil unit, the second coil unit, the third coil unit, the fourth coil unit, the fifth coil unit, the sixth coil unit, the seventh coil unit and the eighth coil unit are perpendicular to the direction of the main magnetic field, and the arrangement directions of the seventh coil unit and the eighth coil unit are perpendicular to the direction of the main magnetic field.
A magnetic resonance radio frequency array coil device comprises a coil supporting shell, wherein two magnetic resonance radio frequency array coils of the structure are arranged in the coil supporting shell, and the two magnetic resonance radio frequency array coils are arranged in a mutually separated mode.
The application has the advantages that:
1. eight coil units are ingeniously arranged in the magnetic resonance radio frequency array coil, six coils are distributed in an annular mode, two adjacent coil units are partially overlapped and decoupled, the other two coil units are arranged at the ring center, the two coil units at the ring center are partially overlapped with the coil units on the ring as much as possible to decouple, the image signal to noise ratio of the central area of the array coil along the direction of a main magnetic field (B0 field) is remarkably improved, and the magnetic resonance imaging quality is further improved.
2. The two coil units at the annular center are also partially overlapped to decouple, so that the image signal-to-noise ratio of the central area of the coil along the main magnetic field direction is further improved, and the magnetic resonance imaging quality is further improved.
3. During imaging examination, the normal direction of each coil unit is perpendicular to the direction of the main magnetic field, and the arrangement direction of the two coil units at the center of the ring is also perpendicular to the direction of the main magnetic field, so that a magnetic resonance image with higher quality can be acquired.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a conventional eight-channel MRI RF array coil;
FIG. 2 is a schematic diagram of another conventional eight-channel MRI RF array coil;
fig. 3 is a schematic diagram of a structure in which two adjacent coil units are arranged along the direction of the main magnetic field and partially coincide with each other, wherein the arrows indicate the direction of the main magnetic field (B0 field);
FIG. 4 is a signal-to-noise ratio distribution of the two coil units of FIG. 3;
figure 5 is a schematic diagram of the structure of a magnetic resonance radio frequency array coil in an embodiment of the present application, with arrows indicating the direction of the main magnetic field (B0 field).
Wherein: 1-a first coil unit, 2-a second coil unit, 3-a third coil unit, 4-a fourth coil unit, 5-a fifth coil unit, 6-a sixth coil unit, 7-a seventh coil unit, 8-an eighth coil unit.
Detailed Description
The present application will be described in further detail below with reference to the accompanying drawings by way of specific embodiments. The present application may be embodied in many different forms and is not limited to the embodiments described in the present embodiment. The following detailed description is provided to facilitate a more thorough understanding of the present disclosure, and the words used to indicate orientation, top, bottom, left, right, etc. are used solely to describe the illustrated structure in connection with the accompanying figures.
One skilled in the relevant art will recognize, however, that one or more of the specific details can be omitted, or other methods, components, or materials can be used. In some instances, some embodiments are not described or not described in detail.
Furthermore, the technical features, aspects or characteristics described herein may be combined in any suitable manner in one or more embodiments. It will be readily appreciated by those of skill in the art that the order of the steps or operations of the methods associated with the embodiments provided herein may be varied. Thus, any sequence in the figures and examples is for illustrative purposes only and does not imply a requirement in a certain order unless explicitly stated to require a certain order.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).
Fig. 5 shows a specific embodiment of the magnetic resonance radio frequency array coil of the present application, which is composed of eight coil units, namely, a first coil unit 1, a second coil unit 2, a second coil unit 3, a fourth coil unit 4, a fifth coil unit 5, a sixth coil unit 6, a seventh coil unit 7 and an eighth coil unit 8. The first coil unit 1, the second coil unit 2, the second coil unit 3, the fourth coil unit 4, the fifth coil unit 5 and the sixth coil unit 6 are sequentially arranged along the annular direction, and any two adjacent coil units are partially overlapped (Overlap) to be decoupled, so that a closed loop is formed by the six coil units together. The other two coil units, i.e. the seventh coil unit 7 and the eighth coil unit 8, are arranged on the inner side of the aforementioned closed loop, i.e. in the central hole of the closed loop, and the seventh coil unit 7 and the eighth coil unit 8 are also arranged partially overlapping (Overlap) for decoupling.
Referring again to fig. 5, the third coil unit 3, the seventh coil unit 7, and the eighth coil unit 8 have a common overlapping region. The sixth coil unit 6, the seventh coil unit 7, and the eighth coil unit 8 have a common overlapping area. The first coil unit 1, the second coil unit 2, and the seventh coil unit 7 have a common overlapping area. The fourth coil unit 4, the fifth coil unit 5, and the eighth coil unit 8 have a common overlapping area.
The closed loop formed by enclosing the six coil units has a rectangular outer contour.
In practical application, in order to improve the quality of magnetic resonance imaging, the magnetic resonance radio frequency array coils with the structure can be respectively arranged on two deviated sides of the imaged part of the patient (for example, the front side and the rear side of the abdomen of the patient, and the left side and the right side of the neck of the patient), and the two magnetic resonance radio frequency array coils with eight channels are mutually matched for use, so that a clearer magnetic resonance image is obtained.
In order to acquire a higher-quality magnetic resonance image, in the imaging examination, the normal directions of the eight coil units (the so-called "normal lines of the coil units", i.e. the straight lines perpendicular to the plane of the coil units, and the directions of the electromagnetic fields generated when current flows through the coil units) should be as perpendicular as possible to the main magnetic field direction, and the arrangement directions of the seventh coil unit 7 and the eighth coil unit 8 (i.e. the left-right directions parallel to the paper surface in fig. 5) should be perpendicular to the main magnetic field direction, as shown in fig. 5.
The two magnetic resonance radio frequency array coils can be arranged inside a coil supporting shell, and the two magnetic resonance radio frequency array coils which are separated from each other are supported and fixed by the coil supporting shell, so that the magnetic resonance imaging method can be conveniently implemented.
Of course, in practical application, a magnetic resonance radio frequency array coil with the above structure can be arranged on only one side of the imaged part of the patient, and a better magnetic resonance image can be obtained.
The above embodiments are only for illustrating the technical concepts and features of the present application, and the purpose of the embodiments is to enable people to understand the content of the present application and implement the present application, and not to limit the protection scope of the present application. All equivalent changes and modifications made according to the spirit of the main technical scheme of the application are covered in the protection scope of the application.
Claims (9)
1. A magnetic resonance radio frequency array coil, characterized by comprising a first coil unit (1), a second coil unit (2), a third coil unit (3), a fourth coil unit (4), a fifth coil unit (5) and a sixth coil unit (6) which are sequentially arranged along a ring direction in a partially overlapped manner, wherein the first coil unit (1) and the sixth coil unit (6) are also partially overlapped to form a closed loop composed of the first coil unit (1), the second coil unit (2), the third coil unit (3), the fourth coil unit (4), the fifth coil unit (5) and the sixth coil unit (6), and a seventh coil unit (7) partially overlapped with the first coil unit (1), the second coil unit (2), the third coil unit (3) and the sixth coil unit (6) and a seventh coil unit (7) partially overlapped with the third coil unit (6) are arranged on the inner side of the closed loop A coil unit (3), a fourth coil unit (4), a fifth coil unit (5), an eighth coil unit (8) in which the sixth coil unit (6) partially coincides, a seventh coil unit (7) and the eighth coil unit (8) partially coincide.
2. The magnetic resonance radio frequency array coil according to claim 1, characterized in that the third coil unit (3), the seventh coil unit (7), the eighth coil unit (8) have a common overlap region;
the sixth coil unit (6), the seventh coil unit (7), and the eighth coil unit (8) have a common overlapping area.
3. The magnetic resonance radio frequency array coil according to claim 1, characterized in that the first coil unit (1), the second coil unit (2), the seventh coil unit (7) have a common overlap area.
4. The magnetic resonance radio frequency array coil according to claim 1, characterized in that the fourth coil unit (4), the fifth coil unit (5), the eighth coil unit (8) have a common overlapping area.
5. The magnetic resonance radio frequency array coil of claim 1, wherein the outer contour of the closed loop is rectangular.
6. A magnetic resonance imaging method, characterized in that a magnetic resonance radio frequency array coil according to any one of claims 1 to 5 is arranged at the side of an imaged part.
7. A magnetic resonance imaging method according to claim 6, wherein one magnetic resonance radio frequency array coil according to any one of claims 1 to 5 is arranged on each of two sides of the imaged portion.
8. The magnetic resonance imaging method according to claim 6, characterized in that normal directions of the first coil unit (1), the second coil unit (2), the third coil unit (3), the fourth coil unit (4), the fifth coil unit (5), the sixth coil unit (6), the seventh coil unit (7), and the eighth coil unit (8) are perpendicular to a main magnetic field direction, and an arrangement direction of the seventh coil unit (7) and the eighth coil unit (8) is perpendicular to the main magnetic field direction.
9. A magnetic resonance radio frequency array coil apparatus comprising a coil support housing, wherein two magnetic resonance radio frequency array coils as claimed in any one of claims 1 to 5 are disposed within the coil support housing and are spaced apart from each other.
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| CN113253173B (en) * | 2021-05-08 | 2023-12-08 | 苏州众志医疗科技有限公司 | Radio frequency coil device for magnetic resonance neck imaging |
| CN115629346B (en) * | 2022-11-10 | 2023-12-26 | 中国科学院深圳先进技术研究院 | Multichannel transrectal prostate coil, system and working method |
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| CN109937367A (en) * | 2016-11-23 | 2019-06-25 | 通用电气公司 | Rf coil system for MR imaging |
| CN109001656A (en) * | 2018-04-28 | 2018-12-14 | 中国科学院深圳先进技术研究院 | A kind of flexible radio frequency receiving coil array |
| CN110554334A (en) * | 2018-05-31 | 2019-12-10 | 通用电气公司 | Method and system for coil selection in magnetic resonance imaging |
| CN212083642U (en) * | 2020-03-27 | 2020-12-04 | 苏州众志医疗科技有限公司 | Magnetic resonance radio frequency array coil and device |
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