Magnetic resonance radio frequency array coil with multiple orthogonal coil pairs

Abstract

The present application discloses a magnetic resonance radio frequency array coil having multiple orthogonal coil pairs, including at least two orthogonal coil pairs arranged sequentially along a first direction. Each orthogonal coil pair is respectively composed of an annular coil and a saddle coil arranged insulated from the annular coil. The saddle coil is an "8"-shaped structure composed of a first coil body and a second coil body that are connected to each other and arranged sequentially along the first direction. Two annular coils of any two adjacent orthogonal coil pairs partially overlap for decoupling, and two saddle coils of any two adjacent orthogonal coil pairs partially overlap for decoupling. The radio frequency array coil of the present application optimizes the structures and distribution manners of the respective coil pairs, thereby improving the overall performance of the radio frequency array coil.

Description

Technical Field

[0001] This application relates to the field of magnetic resonance imaging, and particularly to a magnetic resonance radio frequency array coil with multiple orthogonal coil pairs. Background Art

[0002] Magnetic resonance imaging technology has become an important means for modern medical clinical diagnosis. It has the advantages of high tissue density contrast, being able to perform layer imaging in any orientation, and having no ionizing radiation, and is being applied more and more widely.

[0003] The radio frequency receiving coil is an important component of the imaging system. It is at the very front end of the receiving chain and plays a crucial role in the imaging quality, directly affecting the quality of the imaging. The most basic part of the radio frequency coil is the coil unit, and factors such as the distribution direction, shape, and number of the coil units also directly affect the performance of the radio frequency coil. When the number of coil units is greater than or equal to 2, it can be called an array coil. When the positions of any two units are relatively close, they will have an impact on each other, which is called the coupling between coil units. For an array coil, coupling is a negative factor and has a certain impact on the coil performance. The greater the coupling, the greater the negative impact. Therefore, decoupling means are often needed between units to improve the coil performance.

[0004] The decoupling methods can be summarized into 4 types:

[0005] 1. Partial overlap (Overlap) decoupling: This is the preferred method for decoupling between two units, but generally it can only be used between adjacent 2 units.

[0006] 2. Inductive decoupling: Each of the two units is connected in series with an inductor, and the two inductors overlap and couple with each other, which can generate a reverse coupling to cancel the coupling between the two units.

[0007] 3. Capacitive decoupling: One or more common capacitors are added between the two units, which can generate a reverse coupling at both ends of the capacitor to cancel the coupling between the two units.

[0008] 4. Preamplifier decoupling: In a radio frequency receiving coil, each unit is followed by a preamplifier, and this preamplifier is designed to have a decoupling function. However, the function of this preamplifier decoupling is limited and often can only be used as a supplement. For two coil units with relatively strong original coupling, relying solely on preamplifier decoupling often does not achieve an ideal effect.

[0009] In summary, leaving aside the inherent decoupling function of the preamplifier, among the remaining three decoupling methods, partial overlap is the best natural decoupling method, with good decoupling effect and no need to add circuits such as capacitors and inductors that may have side effects. However, partial overlap decoupling can generally only be used between two adjacent coil units. For two non-adjacent units, if the coupling is still relatively large and the decoupling by the preamplifier alone cannot achieve the ideal effect, the above-mentioned inductor or capacitor decoupling method can be used for processing. However, due to side effects, the more circuits are added, the greater the possible side effects. Usually, two types of decoupling methods are not used simultaneously between two units. For example, if overlap decoupling is used, capacitor or inductor decoupling will not be used again. Similarly, if inductor (capacitor) decoupling is used, the capacitor (inductor) decoupling circuit will not be added simultaneously, which is equivalent to unnecessary overkill.

[0010] Looking back at the design development history of coil units, orthogonal coils were very popular more than 20 years ago, that is, a toroidal coil and a saddle-shaped coil were combined into a pair of orthogonal coil pairs, as Figure 1 shown. The characteristics of this design are that the toroidal coil unit appears relatively square, and the copper skin of the saddle-shaped coil unit covers a larger area in the left-right direction. The characteristic of this design is that due to symmetry, the coupling between the two units cancels each other out, and ideally there is no coupling, and the signals are orthogonally superimposed on each other. Especially in the middle section of the left-right direction (the arrangement direction of the two coil halves of the saddle-shaped coil), the improvement of the signal (signal-to-noise ratio) is very obvious, and the penetration and uniformity are also very good. If a larger imaging range and more coil units are required, this design can be arrayed, Figure 2 forming an array coil structure composed of multiple orthogonal coil pairs. The two toroidal coil units of adjacent orthogonal coil pairs use overlap decoupling, and the two saddle-shaped coil units of adjacent orthogonal coil pairs also use overlap decoupling. Between the toroidal and saddle-shaped coils, regardless of whether they are in the same orthogonal coil pair, due to symmetric distribution, the coupling cancels each other out and no decoupling is required. Figure 2 For this kind of orthogonal array coil, because of the advantages of signal-to-noise ratio and penetration in the middle section of the left-right direction of the coil, it is especially suitable for spinal imaging. Until today, it is still the preferred choice for spinal coils of many manufacturers and hospitals.

[0011] However, it is not easy to expand the orthogonal coil pair in the left-right (or front-back) direction in this form. As Figure 3For the two orthogonally arranged coil pairs shown on the left and right, since any one toroidal coil unit is relatively far from the two coil units of the other orthogonal coil pair, the coupling will not be very large, and preamplifier decoupling is sufficient. However, in this combination, since the signals are concentrated in the middle of the orthogonal coil pair and are weak on the left and right sides, the array coil in this combination method will show a non-uniform signal state with wavy undulations in the left-right direction, and the image effect will not be ideal.

[0012] This application comes from this. Summary of the Invention

[0013] The object of this application is: aiming at the problem that the left-right expansion effect of each orthogonal coil pair in the traditional magnetic resonance radio frequency array coil is not good, a radio frequency array coil with an optimized structure and distribution method of each orthogonal coil pair is proposed to improve the overall performance of the magnetic resonance radio frequency array coil with multiple orthogonal coil pairs.

[0014] The technical solution of this application is:

[0015] A magnetic resonance radio frequency array coil includes at least two orthogonal coil pairs arranged sequentially along a first direction. Each orthogonal coil pair is respectively composed of a toroidal coil and a saddle coil insulated from the toroidal coil. The saddle coil is an "8" - shaped structure composed of a first coil body and a second coil body that are connected to each other and arranged sequentially along the first direction. The two toroidal coils of any two adjacent orthogonal coil pairs partially overlap for decoupling, and the two saddle coils of any two adjacent orthogonal coil pairs partially overlap for decoupling.

[0016] Based on the above technical solution, this application also includes the following preferred solutions:

[0017] In any two adjacent orthogonal coil pairs, the overlapping region of the two saddle coils projects inside the overlapping region of the two toroidal coils in a second direction perpendicular to the first direction.

[0018] The second direction is the extension direction of the angular bisector of the angle between the axes of two adjacent toroidal coils.

[0019] The saddle coil in any orthogonal coil pair partially overlaps with the toroidal coil in the adjacent orthogonal coil pair for decoupling, and the toroidal coil in any orthogonal coil pair partially overlaps with the saddle coil in the adjacent orthogonal coil pair for decoupling.

[0020] The first direction is the circumferential direction, and each of the orthogonal coil pairs together forms a closed ring.

[0021] At least three pairs of orthogonal coils are provided. The toroidal coils in each pair of orthogonal coils partially overlap with two toroidal coils in two adjacent pairs of orthogonal coils corresponding thereto for decoupling, and the saddle coils in each pair of orthogonal coils partially overlap with two saddle coils in two adjacent pairs of orthogonal coils corresponding thereto for decoupling.

[0022] In each pair of orthogonal coils, the saddle coil projects inside the toroidal coil in the axial direction of the toroidal coil.

[0023] In each pair of orthogonal coils, the toroidal coil and the saddle coil are arranged in the same plane or the same curved surface.

[0024] The curved surface is an arc surface.

[0025] In each pair of orthogonal coils, the saddle coil is arranged on one axial side of the toroidal coil.

[0026] An inductor or a capacitor for decoupling is provided on each toroidal coil.

[0027] The saddle coil is formed by kinking the toroidal coil. Two coil segments of the saddle coil that are arranged in an "x" - shaped cross - arrangement in the middle of the "8" - shaped structure are in contact with each other and are insulated.

[0028] The advantages of this application are as follows:

[0029] 1. In this application, the structures and positional arrangements of the orthogonal coil pairs in the magnetic resonance array coil are optimized. Two toroidal coils in any two adjacent pairs of orthogonal coils partially overlap for decoupling, and two saddle coils in any two adjacent pairs of orthogonal coils partially overlap for decoupling. As a result, each pair of orthogonal coils can be extended with small coupling along the arrangement direction of the two coil halves of the saddle coil (the left - right direction in the background art), thereby improving the overall performance of the radio - frequency array coil.

[0030] 2. During the manufacturing process of the magnetic resonance array coil as described above, although the relative positions of two adjacent toroidal coils can be adjusted to obtain an ideal - sized first overlapping region, and the relative positions of two adjacent saddle coils can be adjusted to obtain an ideal - sized second overlapping region. However, when the sizes of the first overlapping region and the second overlapping region are fixed and the second overlapping region is arranged at the center position of the first overlapping region, the area size and position of the third overlapping region between the adjacent toroidal coil and the saddle coil are determined and cannot be adjusted. However, the size of the ideal overlapping region between the adjacent toroidal coil and the saddle coil usually does not equal the actual third overlapping region, and even the gap between the ideal overlapping region and the actual third overlapping region is relatively large. The negative effect of coupling cannot be completely eliminated by the pre - amplifier for decoupling and cannot be ignored. Based on this, an inductor or a capacitor for auxiliary decoupling is provided on each toroidal coil, thereby solving the problem of insufficient (or excessive) Overlap decoupling. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. The drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0032] Figure 1 It is a schematic diagram of a traditional orthogonal coil pair structure;

[0033] Figure 2 It is a schematic diagram of a traditional magnetic resonance array coil structure composed of three orthogonal coil pairs;

[0034] Figure 3 It is an extended schematic diagram of the orthogonal coil pair in the traditional magnetic resonance array coil in the left-right direction.

[0035] Figure 4 It is a schematic diagram of a structure of an orthogonal coil pair in Embodiment 1 of the present application.

[0036] Figure 5 It is a schematic diagram of the structure of the magnetic resonance array coil after being unfolded in Embodiment 1 of the present application.

[0037] Figure 6 It is a schematic diagram of the structure of the magnetic resonance array coil in Embodiment 1 of the present application.

[0038] Figure 7 It is a schematic diagram of the structure of the overlapping region between two adjacent orthogonal coil pairs in Embodiment 1 of the present application.

[0039] Figure 8 It is a schematic diagram of the structure of the overlapping region between two adjacent toroidal coils in Embodiment 1 of the present application.

[0040] Figure 9 It is a schematic diagram of the structure of the overlapping region between two adjacent saddle-shaped coils in Embodiment 1 of the present application.

[0041] Figure 10 It is a schematic diagram of the structure of the overlapping region between the adjacent left toroidal coil and the right saddle-shaped coil in Embodiment 1 of the present application.

[0042] Figure 11 It is a schematic diagram of the structure of the overlapping region between the adjacent right toroidal coil and the left saddle-shaped coil in Embodiment 1 of the present application.

[0043] Figure 12 It is a schematic diagram of the structure of the magnetic resonance array coil after being unfolded in Embodiment 2 of the present application.

[0044] Figure 13This is a schematic structural diagram of the overlapping region between two adjacent circular coils in the second embodiment of the present application.

[0045] Figure 14 This is a schematic structural diagram of another structural form of the magnetic resonance array coil after unfolding in the second embodiment of the present application.

[0046] Wherein: 1 - circular coil, 2 - saddle coil, 2a - first coil body, 2b - second coil body. Detailed implementation manners

[0047] The present application will be further described in detail below in conjunction with the accompanying drawings through specific implementation manners. The present application can be implemented in many different forms and is not limited to the implementation manners described in this embodiment. The purpose of providing the following specific implementation manners is to facilitate a clearer and more thorough understanding of the disclosed content of the present application. The words indicating directions such as up, down, left, and right are only for the positions of the shown structures in the corresponding drawings.

[0048] However, one or more of the specific details described herein may be omitted by those skilled in the art, or other methods, components, or materials may be used instead. In some examples, some implementation manners are not described or not described in detail.

[0049] In addition, the technical features and technical solutions described herein can also be combined in any suitable manner in one or more embodiments. For those skilled in the art, it is easy to understand that the steps or operation sequences of the methods related to the embodiments provided herein can also be changed. Therefore, any sequence in the drawings and embodiments is only for illustrative purposes and does not imply a requirement to follow a certain sequence unless specifically stated to follow a certain sequence.

[0050] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. And the "connection" and "coupling" mentioned in the present application, unless otherwise specified, both include direct and indirect connection (coupling).

[0051] Embodiment 1:

[0052] Figure 6A preferred embodiment of the magnetic resonance radio frequency array coil of the present application is shown, which includes three orthogonal coil pairs arranged sequentially along the circumferential direction. Each orthogonal coil pair is respectively composed of an annular coil 1 and a saddle-shaped coil 2 arranged insulated from the annular coil. The aforementioned saddle-shaped coil has such a structure well-known in the industry: the conventional annular coil is kinked into an "8" - shaped structure to deform the saddle-shaped coil 2, which includes a first coil body 2a and a second coil body 2b connected to each other, and the first coil body 2a and the second coil body 2b are also sequentially distributed along the aforementioned circumferential direction. In any two adjacent orthogonal coil pairs, not only the two annular coils 1 partially overlap to decouple, but also the two saddle-shaped coils 2 partially overlap to decouple.

[0053] In this embodiment, two coil segments arranged in an "x" - shaped cross in the middle of the above "8" - shaped structure of the saddle-shaped coil 2 are in contact with each other and arranged insulated. Arranging the two coil segments distributed in an "x" - shaped cross in contact with each other is for the convenience of the saddle-shaped coil 2 to be closely fixed on the coil support.

[0054] As previously mentioned, the three orthogonal coil pairs of this radio frequency array coil are arranged sequentially along the circumferential direction, and the two annular coils 1 of any two adjacent orthogonal coil pairs partially overlap, and the two saddle-shaped coils 2 of any two adjacent orthogonal coil pairs partially overlap. If along the above circumferential direction, the aforementioned three orthogonal coil pairs are respectively called the first orthogonal coil pair, the second orthogonal coil pair, and the third orthogonal coil pair, then the first orthogonal coil pair and the second orthogonal coil pair, and the second orthogonal coil pair and the third orthogonal coil pair arranged in the Overlap manner both have good decoupling effects. In order to improve the decoupling effect between the first orthogonal coil pair and the third orthogonal coil pair in this embodiment, the first orthogonal coil pair and the third orthogonal coil pair are also arranged in the Overlap manner - the annular coil 1 of the first orthogonal coil pair and the annular coil 1 of the third orthogonal coil pair partially overlap to decouple, and the saddle-shaped coil 2 of the first orthogonal coil pair and the saddle-shaped coil 2 of the third orthogonal coil pair partially overlap to decouple. In this way, these three coil pairs together form a closed ring (or closed cylinder), and the circumferential direction of the closed ring is the above-mentioned circumferential direction.

[0055] It can be known from the above that the annular coil 1 in each orthogonal coil pair partially overlaps with the two annular coils 1 in the corresponding adjacent two orthogonal coil pairs to decouple, the saddle-shaped coil 2 in each orthogonal coil pair partially overlaps with the two saddle-shaped coils 2 in the corresponding adjacent two orthogonal coil pairs to decouple, and each orthogonal coil pair is arranged in the Overlap manner with the adjacent two orthogonal coil pairs to decouple.

[0056] Refer to Figure 5 and Figure 6As shown, in this embodiment, the saddle coils 2 in any orthogonal coil pair partially overlap with the toroidal coils 1 in the adjacent orthogonal coil pair for decoupling, and the toroidal coils 1 in any orthogonal coil pair partially overlap with the saddle coils 2 in the adjacent orthogonal coil pair for decoupling. In this way, not only is there a good decoupling effect between the two toroidal coils 1 and between the two saddle coils 2 of adjacent orthogonal coil pairs, but also there is a good decoupling effect between the toroidal coil 1 and the saddle coil 2 in adjacent orthogonal coil pairs respectively, which further improves the decoupling effect of adjacent orthogonal coil pairs.

[0057] Referring again to Figure 5 and Figure 6 As shown, in any two adjacent orthogonal coil pairs, the overlapping region A2 of the two saddle coils 2 projects inside the overlapping region A1 of the two toroidal coils 1 in the radial direction of the aforementioned closed ring (for the convenience of readers to understand the technical solution of this application, this radial direction is called the first radial direction). Obviously, the radial direction of the aforementioned closed ring is perpendicular to the aforementioned circumferential direction. Since the shapes and sizes of the toroidal coils 1 in this embodiment are the same, and the axis of each toroidal coil 1 extends along the radial direction of the aforementioned closed ring, the aforementioned first radial direction is the extension direction of the angular bisector of the axes of the corresponding two adjacent toroidal coils 1.

[0058] As Figure 4 , Figure 5 and Figure 6 As shown, in each orthogonal coil pair, the saddle coil 2 projects inside the toroidal coil 1 in the axial direction of the toroidal coil 1, that is, the projection of the saddle coil 2 along the axial direction of the toroidal coil 1 is inside (or passes through) the toroidal coil 1. Such a setting is beneficial: it makes it easier to implement the above-mentioned Overlap arrangement for adjacent orthogonal coil pairs. As a result, it is equivalent to expanding the left and right dimensions of the toroidal coil in the traditional orthogonal coil pair, avoiding the obvious concentration of signals in the middle.

[0059] In this embodiment, the toroidal coil 1 and the saddle coil 2 of each orthogonal coil pair are arranged in the same arc surface. Combining with the "the saddle coil 2 of each orthogonal coil pair projects inside the toroidal coil 1 in the axial direction of the toroidal coil 1" introduced above, it is not difficult to know that: the saddle coil 2 of each orthogonal coil pair is completely arranged inside the toroidal coil 1 of this orthogonal coil pair.

[0060] In some other embodiments of this application, the saddle coil 2 in the orthogonal coil pair can also be arranged on one axial side of the toroidal coil 1, that is, the saddle coil 2 is separated from the toroidal coil 1 by a certain (very small) distance in the axial direction of the toroidal coil 1, which is not contradictory to "the saddle coil 2 of each orthogonal coil pair projects inside the toroidal coil 1 in the axial direction of the toroidal coil 1".

[0061] It should be noted that in some other embodiments of the present application, the annular coil 1 and the saddle coil 2 in each orthogonal coil pair can also be arranged in the same plane. Furthermore, each orthogonal coil pair can be arranged sequentially and partially overlapped along a straight line direction, and all the annular coils 1 and all the saddle coils 2 can be arranged in the same plane. In this case, the overlapping area A2 of the two saddle coils 2 in any two adjacent orthogonal coil pairs can be projected inside the overlapping area A1 of the two annular coils 1 in the axial direction of the annular coil (obviously the axial direction of the annular coil is perpendicular to the linear arrangement direction of each orthogonal coil pair).

[0062] In some other embodiments of the present application, each orthogonal coil pair can also be arranged sequentially and partially overlapped along the direction of the curve, especially the arc direction. In this case, the overlapping area A2 of the two saddle coils 2 of any two adjacent orthogonal coil pairs can be projected inside the overlapping area A1 of the two annular coils 1 in a direction perpendicular to the aforementioned curve. Those skilled in the art can easily understand that the direction perpendicular to the curve is the direction perpendicular to the tangent of the corresponding position point on the curve. And, in general, the aforementioned direction perpendicular to the curve is the extension direction of the angle bisector of the axes of the corresponding two adjacent annular coils 1.

[0063] Refer to Figures 7 to 11 As shown, for the convenience of explanation, A1 represents the overlap area of two ring coils 1 in two adjacent orthogonal coil pairs, A2 represents the overlap area of two saddle coils 2 in two adjacent orthogonal coil pairs, A4 represents the overlap area of adjacent ring coils 1 and saddle coils 2, and A3 represents the ideal overlap area of adjacent ring coils 1 and saddle coils 2. During implementation, the relative positions of the two adjacent ring coils 1 can be adjusted to obtain the ideal size of the A1 overlap area, and the relative positions of the two adjacent saddle coils 2 can be adjusted to obtain the ideal size of the A2 overlap area. However, when the sizes of the A1 overlap area and the A2 overlap area are fixed and the A2 overlap is arranged at the center of the A1 overlap area, the area size and position of the A4 overlap area are determined and cannot be adjusted. However, the size of the ideal overlap area A3 of the adjacent ring coils 1 and saddle coils 2 is usually not equal to the actual A4 overlap area, and there is even a large difference between the sizes of A3 and A4. The negative effect of coupling cannot be completely eliminated by pre-amplifier decoupling and cannot be ignored.

[0064] In order to solve the problem of the difference between the actual Overlap A4 and the ideal Overlap A3, the applicant has proposed a solution in the following second embodiment.

[0065] Embodiment 2:

[0066] In view of the problem that A1, A2, A3, and A4 in Embodiment 1 are interrelated and contradictory to each other, Embodiment 2 of the present invention proposes a solution of composite decoupling: Different from the traditional method (described in the background art) of selecting one of the three decoupling methods, we propose that in the case of insufficient (or excessive) Overlap decoupling, an inductance supplementary decoupling (or over-coupling compensation) method is adopted to solve this contradiction. Specifically, as Figure 12 and Figure 13 shown, in this embodiment, in any two adjacent orthogonal coil pairs, an inductor 3 is disposed on each toroidal coil 1 in the overlapping region of the two toroidal coils 1.

[0067] The above-mentioned inductor 3 disposed on the toroidal coil 1 does not have to be arranged in the overlapping region of two adjacent toroidal coils, and can also be arranged Figure 14 outside the overlapping region as shown, which can also make up for the insufficient (or excessive) Overlap decoupling. However, arranging the inductor 3 in the overlapping region of two adjacent toroidal coils can reduce the size and occupied space of the array coil, and facilitate the installation and arrangement of each component of the array coil.

[0068] Of course, we can also set a capacitor on each toroidal coil 1 to replace the above-mentioned inductor 3, which also has an auxiliary decoupling function and can make up for the insufficient or excessive Overlap decoupling of adjacent coil pairs.

[0069] The above embodiments are only used to illustrate the technical concept and features of the present application, and the purpose is to enable people to understand the content of the present application and implement it accordingly, and cannot be used to limit the protection scope of the present application. Any equivalent transformation or modification made according to the spirit of the main technical solution of the present application should be covered within the protection scope of the present application.

Claims

1. A magnetic resonance radio frequency array coil, comprising at least two orthogonal coil pairs arranged sequentially along a first direction, each orthogonal coil pair being respectively composed of a toroidal coil (1) and a saddle coil (2) insulated from the toroidal coil, the saddle coil (2) being a figure-8 structure composed of a first loop body (2a) and a second loop body (2b) which are connected to each other and arranged sequentially along the first direction, characterized in that, Two toroidal coils (1) of any two adjacent orthogonal coil pairs partially overlap for decoupling, and two saddle coils (2) of any two adjacent orthogonal coil pairs partially overlap for decoupling; In any two adjacent orthogonal coil pairs, the overlapping region of the two saddle coils (2) projects inside the overlapping region of the two toroidal coils (1) in a second direction perpendicular to the first direction.

2. The magnetic resonance radio frequency array coil according to claim 1, wherein The second direction is the extension direction of the angular bisector of the angle between the axes of two adjacent toroidal coils (1).

3. The magnetic resonance radio frequency array coil according to claim 1, characterized in that, The saddle coil (2) in any orthogonal coil pair partially overlaps with the toroidal coil (1) in the adjacent orthogonal coil pair for decoupling, and the toroidal coil (1) in any orthogonal coil pair partially overlaps with the saddle coil (2) in the adjacent orthogonal coil pair for decoupling.

4. The magnetic resonance radio frequency array coil according to claim 1, wherein The first direction is the circumferential direction, and each of the orthogonal coil pairs together forms a closed ring.

5. The magnetic resonance radio frequency array coil according to claim 4, wherein, At least three orthogonal coil pairs are provided. The toroidal coil (1) in each orthogonal coil pair partially overlaps with the two toroidal coils (1) in the corresponding two adjacent orthogonal coil pairs for decoupling, and the saddle coil (2) in each orthogonal coil pair partially overlaps with the two saddle coils (2) in the corresponding two adjacent orthogonal coil pairs for decoupling.

6. The magnetic resonance radio frequency array coil according to claim 1, wherein In each orthogonal coil pair, the saddle coil (2) projects inside the toroidal coil (1) in the axial direction of the toroidal coil (1).

7. The magnetic resonance radio frequency array coil according to claim 6, wherein In each orthogonal coil pair, the toroidal coil (1) and the saddle coil (2) are arranged in the same plane or the same curved surface.

8. The magnetic resonance radio frequency array coil according to claim 7, wherein The curved surface is an arc surface.

9. The magnetic resonance radio frequency array coil according to claim 6, characterized in that, In each orthogonal coil pair, the saddle coil (2) is arranged on one axial side of the toroidal coil (1).

10. The magnetic resonance radio frequency array coil according to any one of claims 1 to 9, characterized in that, An inductor (3) or a capacitor for decoupling is provided on each toroidal coil (1).

11. The magnetic resonance radio frequency array coil according to any one of claims 1 to 9, characterized in that, The saddle coil (2) is formed by kinking a toroidal coil. Two coil segments arranged in an "x" shape and crossing each other in the middle of the "8" - shaped structure of the saddle coil (2) are in contact with each other and are insulated.

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