阅读说明：本技术 射频线圈组件及磁共振系统 (Radio frequency coil assembly and magnetic resonance system ) 是由 徐烽 王振 张春敏 李烨 晏焕华 于 2020-04-20 设计创作，主要内容包括：本发明涉及一种射频线圈组件,包括底部线圈与顶部线圈。底部线圈,包括底板、第一线圈单元和第二线圈单元,第一线圈单元和第二线圈单元分别设置于底板,底板上具有多个安装位。顶部线圈能够设置于至少一个安装位,顶部线圈设置于其中至少一个安装位时能够与第一线圈单元形成第一线圈对,顶部线圈设置于至少另一个安装位时能够与第二线圈单元形成第二线圈对。本发明还涉及磁共振系统。上述射频线圈组件及磁共振系统,可将调线圈分别安装在测试者不同部位对应的安装位上,便捷的对测试者的不同身体部位进行成像,进而在不改变测试者体位情况下实现了对测试者不同部位进行磁共振成像。(The invention relates to a radio frequency coil assembly, which comprises a bottom coil and a top coil. The bottom coil comprises a bottom plate, a first coil unit and a second coil unit, wherein the first coil unit and the second coil unit are respectively arranged on the bottom plate, and a plurality of installation positions are arranged on the bottom plate. The top coil can set up in at least one installation position, and the top coil can form first coil pair with first coil unit when setting up in wherein at least one installation position, and the top coil can form second coil pair with second coil unit when setting up in at least another installation position. The invention also relates to a magnetic resonance system. According to the radio frequency coil assembly and the magnetic resonance system, the adjusting coil can be respectively installed on the installation positions corresponding to different positions of a tester, so that different body positions of the tester can be conveniently imaged, and then the magnetic resonance imaging of different positions of the tester is realized under the condition that the body position of the tester is not changed.)

1. A radio frequency coil assembly, comprising:

the bottom coil comprises a bottom plate, a first coil unit and a second coil unit, wherein the first coil unit and the second coil unit are respectively arranged on the bottom plate, the bottom plate is provided with a plurality of installation positions, the first coil unit and the second coil unit are arranged at intervals or adjacently along the extension direction of the bottom plate, and the installation positions are arranged at intervals along the extension direction of the bottom plate;

the bottom end of the supporting part can be installed at any one of the installation positions, and the supporting part extends in the vertical direction;

the top coil, set up in the supporting part is kept away from along self extending direction the position of bottom plate, the top coil is followed the extending direction of supporting part with first coil unit or second coil unit interval sets up, the supporting part sets up in wherein at least one during the installation position, the top coil can with first coil unit forms first coil pair, the supporting part sets up in at least another during the installation position, the top coil can with the second coil unit forms second coil pair.

2. The radio frequency coil assembly according to claim 1, wherein the bottom plate is provided with a first mounting groove and a second mounting groove along an extending direction thereof, the first mounting groove forms one of the mounting positions, and the second mounting groove forms the other mounting position; the bottom of supporting part can be in the mode fixed mounting of joint in first mounting groove or the second mounting groove.

3. The radio frequency coil assembly according to claim 1 or 2, wherein the top coil is provided to the support portion with a position adjustable along an extending direction of the support portion.

4. The radio frequency coil assembly of claim 3, wherein the supporting portion comprises a supporting column and a positioning clip, the bottom end of the supporting column can be mounted at any one of the mounting positions, and the supporting column extends in a vertical direction; the support column has the spout along self extending direction, location joint spare set up in the support column is kept away from the other end of bottom plate.

5. The radio frequency coil assembly according to claim 4, wherein the top coil includes a third coil unit, a sliding portion and a sliding clip, the sliding portion and the sliding clip being fixedly connected to the third coil unit, respectively; the sliding part can slide set up in the spout, location joint spare can be in arbitrary position chucking slip joint spare, and then follow the extending direction of support column is fixed top coil.

6. The radio frequency coil assembly of claim 5, wherein the positioning catch comprises a pawl, the sliding catch comprises a ratchet, the pawl mates with the ratchet, and a button is disposed on a top of the pawl, wherein pressing the button disengages the pawl from the ratchet.

7. The radio frequency coil assembly of claim 6, wherein the positioning clip further comprises a return spring, one end of the return spring is fixed to the support post, and the other end of the return spring abuts against an end of the pawl away from the button.

8. The radio frequency coil assembly of claim 3, wherein the support portion further comprises an adjustable reset disposed between the support post and the top coil; the top coil is close to along the extending direction of support column when the bottom plate supports and pushes one end of the adjustable piece that resets, the adjustable piece that resets takes place elastic deformation and supports and pushes away towards the direction of keeping away from the bottom plate top coil.

9. A magnetic resonance system, comprising:

a hospital bed;

the base plate is arranged on the sickbed and is electrically connected with the sickbed, a plurality of coil units are arranged in the base plate, and the coil units are arranged at intervals or adjacently along the extending direction of the base plate;

the top coil is arranged on the upper surface of the bottom plate in an adjustable position and is electrically connected with the sickbed, one or more coil units are arranged in the top coil, and the top coil and the bottom plate form an open detection space.

10. The system of claim 9, further comprising:

a receiving coil disposed in the open detection space;

the bottom end of the supporting part is adjustably inserted and arranged on the upper surface of the bottom plate, and the supporting part extends along the vertical direction; the top coil is arranged on the supporting part, and the position of the top coil along the extending direction of the supporting part is larger than or equal to the size of the receiving coil along the extending direction of the supporting part.

Technical Field

The invention relates to the technical field of magnetic resonance imaging, in particular to a radio frequency coil assembly and a magnetic resonance system.

Background

Magnetic Resonance Imaging (MRI) systems include a variety of coils, such as body coils that cover the entire body, local coils that cover only a portion of the body, and so forth. At present, nuclear magnetic resonance in the market is generally 1.5T and 3T systems, and as is well known, along with the improvement of field intensity, the signal-to-noise ratio can be greatly improved, but the problem of field nonuniformity can be brought, and a coil capable of supporting local emission needs to be matched with a traditional local receiving coil for use. In high field systems, such as 5T, 7T, 9.4T, 11T, etc., a local transmit coil is usually needed to scan a certain part of the body (such as a shoulder joint), otherwise the image quality is not uniform. The position of the existing local transmitting coil is fixed, and different parts of a tester are inconvenient to scan in the magnetic resonance imaging process.

Disclosure of Invention

Therefore, it is necessary to provide a radio frequency coil assembly and a magnetic resonance system for facilitating scanning different parts of a tester, aiming at the problem that the existing radio frequency coil assembly is inconvenient to scan different parts of the tester.

A radio frequency coil assembly comprising:

the bottom coil comprises a bottom plate, a first coil unit and a second coil unit, wherein the first coil unit and the second coil unit are respectively arranged on the bottom plate, and the bottom plate is provided with a plurality of mounting positions;

the top coil can be arranged in at least one of the installation positions, the top coil can form a first coil pair with the first coil unit when arranged in at least one of the installation positions, and the top coil can form a coil pair with the second coil unit when arranged in at least one of the other installation positions.

In one embodiment, the bottom plate is provided with a first mounting position and a second mounting position, and the top coil can be arranged at the first mounting position or the second mounting position; the top coil is arranged in the first installation position and can form a first Helmholtz coil pair with the first coil unit, and the top coil is arranged in the second installation position and can form a second Helmholtz coil pair with the first coil unit.

In one embodiment, the first coil unit and the second coil unit are respectively disposed in the bottom plate, the first coil unit and the second coil unit are disposed at an interval or adjacent to each other along an extending direction of the bottom plate, and the plurality of mounting positions are disposed at an interval along the extending direction of the bottom plate.

In one embodiment, the top coil and the first coil unit or the second coil unit form a corresponding helmholtz coil pair, and the distance between the top coil and the first coil unit or the second coil unit is adjustable.

In one embodiment, the radio frequency coil assembly further includes a support portion, a bottom end of the support portion is capable of being mounted in any one of the mounting positions, the support portion extends along a vertical direction, the top coil is disposed at a position where the support portion is far away from the bottom plate along an extending direction of the support portion, and the top coil is spaced from the first coil unit or the second coil unit along the extending direction of the support portion.

In one embodiment, the bottom plate is respectively provided with a first mounting groove and a second mounting groove along the extending direction of the bottom plate, the first mounting groove forms one mounting position, and the second mounting groove forms the other mounting position; the bottom of supporting part can be in the mode fixed mounting of joint in first mounting groove or the second mounting groove.

In one embodiment, the top coil is fixedly arranged on the support part in a position adjustable along the extending direction of the support part.

In one embodiment, the supporting part comprises a supporting column and a positioning clamping piece, the bottom end of the supporting column can be installed at any one of the installation positions, and the supporting column extends in the vertical direction; the supporting column is provided with a sliding groove along the extending direction of the supporting column, and the positioning clamping piece is arranged at the other end, far away from the bottom plate, of the supporting column; the top coil comprises a third coil unit, a sliding part and a sliding clamping piece, and the sliding part and the sliding clamping piece are respectively and fixedly connected with the third coil unit; the sliding part can slide set up in the spout, location joint spare can be in arbitrary position chucking slip joint spare, and then follow the extending direction of support column is fixed top coil.

In one embodiment, the positioning clamping piece comprises a pawl, the sliding clamping piece comprises a ratchet, the pawl is matched with the ratchet, a button is arranged on the top of the pawl, and the pawl can be separated from the ratchet by pressing the button.

In one embodiment, the positioning fastener further comprises a return spring, one end of the return spring is fixed on the supporting column, and the other end of the return spring abuts against the end, away from the button, of the pawl.

In one embodiment, the support portion further comprises an adjustable reset piece disposed between the support post and the top coil; the top coil is close to along the extending direction of support column when the bottom plate supports and pushes one end of the adjustable piece that resets, the adjustable piece that resets takes place elastic deformation and supports and pushes away towards the direction of keeping away from the bottom plate top coil.

A local coil comprising a local receive coil and a radio frequency coil assembly as claimed in any one of the above aspects.

In one embodiment, the type of local coil comprises a shoulder joint local coil; the first coil unit corresponds to the left shoulder of a tester, and the second coil unit corresponds to the right shoulder of the tester.

In one embodiment, the local receiving coil is made of a flexible material.

A magnetic resonance system comprising a local coil according to any of the above aspects.

In one embodiment, the magnetic resonance system comprises:

a hospital bed;

the base plate is arranged on the sickbed and is electrically connected with the sickbed, a plurality of coil units are arranged in the base plate, and the coil units are arranged at intervals or adjacently along the extending direction of the base plate;

the top coil is arranged on the upper surface of the bottom plate in an adjustable position and is electrically connected with the sickbed, one or more coil units are arranged in the top coil, and the top coil and the bottom plate form an open detection space.

In one embodiment, the magnetic resonance system further includes:

a receiving coil disposed in the open detection space;

the bottom end of the supporting part is adjustably inserted and arranged on the upper surface of the bottom plate, and the supporting part extends along the vertical direction; the top coil is arranged on the supporting part, and the position of the top coil along the extending direction of the supporting part is larger than or equal to the size of the receiving coil along the extending direction of the supporting part.

Above-mentioned radio frequency coil subassembly, local coil and magnetic resonance system, first coil unit and second coil unit in the bottom coil can correspond the tester respectively and treat the different positions of formation of image to top coil can form the coil pair with first coil unit or second coil unit respectively, can provide very even transmitting field. In the detection process, the top coil is respectively installed on the installation positions corresponding to different positions of the tester, so that different body positions of the tester can be conveniently imaged, and then the magnetic resonance imaging of different positions of the tester is realized under the condition of not changing the body position of the tester.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a radio frequency coil assembly in a large-pitch state according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a bottom coil structure according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a top coil and a supporting portion according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a RF coil assembly in a small pitch state according to an embodiment of the present invention;

fig. 5 is a schematic structural view of a supporting portion according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of a top coil structure according to an embodiment of the present invention;

FIG. 7 is a schematic view of a local coil mounted on a shoulder of a tester according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of a local receive coil according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of a radio frequency coil assembly and local receive coil circuit connection provided in accordance with one embodiment of the present invention;

FIG. 10 is a schematic diagram of a power supply circuit for a RF coil assembly according to an embodiment of the present invention;

fig. 11 is a schematic diagram of a tuning/detuning circuit of a radio frequency coil assembly according to an embodiment of the invention.

Wherein: 10. a radio frequency coil assembly; 100. a bottom coil; 110. a base plate; 111. a first mounting location; 112. a second mounting location; 120. a first coil unit; 130. a second coil unit; 200. a top coil; 210. a third coil unit; 220. a sliding part; 230. a sliding clip member; 300. a support portion; 310. a support pillar; 311. a chute; 320. positioning the clamping piece; 321. a button; 322. a pawl; 323. a return spring; 330. an adjustable reset member; 20. a local receive coil; 30. a transmit coil port; 40. a receive coil port; 50. a connector; 60. a power divider; 70. a coupling circuit.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. The following description of the embodiments is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. In contrast, when an element is referred to as being "directly connected" to another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

In the description of the present invention, it is to be understood that the terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner and are not to be construed as limiting the present invention.

In magnetic resonance systems with high field strengths, the use of local coils is required to improve the image quality of the body part. The invention provides a radio frequency coil assembly, a local coil and a corresponding magnetic resonance system, which can be applied to a high-field magnetic resonance system. It can be understood that the radio frequency coil assembly and the local coil provided by the present invention can be applied to the knee, the head and neck, the wrist, the shoulder joint, etc., and the following embodiments only take the shoulder joint as an example for explanation. The radio frequency coil assembly and the local coil provided by the invention can still directly detect other local parts of the tester, or the radio frequency coil assembly and the local coil provided by the invention can detect other local parts of the tester after adaptive modification.

As shown in fig. 1-2, one embodiment of the present invention provides a radio frequency coil assembly 10 including a bottom coil 100 and a top coil 200. The bottom coil 100 includes a bottom plate 110, a first coil unit 120 and a second coil unit 130, the first coil unit 120 and the second coil unit 130 are respectively disposed on the bottom plate 110, and the bottom plate 110 has a plurality of mounting locations thereon. Top coil 200 can be disposed in at least one mounting location, and top coil 200 can form a first coil pair with first coil unit 120 when disposed in at least one of the mounting locations, and the first coil pair can be a Helmholtz coil pair (Helmholtz coil), and top coil 200 can form a second coil pair with second coil unit 130 when disposed in at least one other mounting location, and the second coil pair can also be a Helmholtz coil pair. It will be appreciated that there is a facing arrangement between the two coils forming the helmholtz coil pair and that the spacing between the two coils should be close to the diameter (or side length) of the individual coils. In this embodiment, the top coil 200 includes an outer top plate support structure and an inner coil unit.

In the rf coil assembly 10, the first coil unit 120 and the second coil unit 130 in the bottom coil 100 can respectively correspond to different portions to be imaged by a tester, and the top coil 200 can respectively form a helmholtz coil pair with the first coil unit 120 or the second coil unit 130, which can provide a uniform transmission field. In the detection process, the top coil 200 is respectively installed on the installation positions corresponding to different parts of the tester, so that different body parts of the tester can be conveniently imaged, and then the magnetic resonance imaging of different parts of the tester is realized under the condition of not changing the body position of the tester.

Optionally, the first coil unit 120 and the second coil unit 130 respectively correspond to one mounting position or several mounting positions (for example, different mounting positions allow different mounting directions of the top coil 200), as long as the top coil 200 can form a helmholtz coil pair with the first coil unit 120 or the second coil unit 130 according to actual detection requirements. Similarly, the plurality of mounting positions on the bottom plate 110 may be consecutive mounting positions or spaced mounting positions, as long as the top coil 200 can form a helmholtz coil pair with the first coil unit 120 or the second coil unit 130 according to actual detection requirements. As shown in fig. 1-2, in an embodiment of the present invention, the base plate 110 has a first mounting location 111 and a second mounting location 112, and the top coil 200 can be disposed at the first mounting location 111 or the second mounting location 112. When the top coil 200 is disposed in the first mounting position 111, it may form a first helmholtz coil pair with the first coil unit 120, and when the top coil 200 is disposed in the second mounting position 112, it may form a second helmholtz coil pair with the first coil unit 120. Further, the first coil unit 120 and the second coil unit 130 are respectively disposed in the bottom plate 110, the first coil unit 120 and the second coil unit 130 are disposed at an interval or adjacent to each other along the extending direction of the bottom plate 110, and the plurality of mounting positions are disposed at an interval along the extending direction of the bottom plate 110.

In the above embodiment, the first mounting position 111 and the second mounting position 112 corresponding to the first coil unit 120 and the second coil unit 130 are disposed on the base plate 110, so that the requirement of performing magnetic resonance imaging on the two shoulder joints of the testee can be met. The two shoulder joints of the tester are respectively aligned with the first coil unit 120 and the second coil unit 130, and the top coil 200 is respectively installed in the first installation position 111 and the second installation position 112, so that high-quality imaging of the two shoulder joints of the tester is realized under the condition of not changing the body position of the tester.

Alternatively, the radio frequency coil assembly 10 in the above embodiments can be implemented in various ways, and should be considered as the scope of the claimed invention. As shown in fig. 1 to 3, as an implementation manner, the rf coil assembly 10 further includes a support portion 300, a bottom end of the support portion 300 can be mounted at any one of the mounting positions, the support portion 300 extends along a vertical direction, the top coil 200 is disposed at a position where the support portion 300 is far away from the bottom plate 110 along an extending direction thereof, and the top coil 200 is spaced apart from the first coil unit 120 or the second coil unit 130 along the extending direction of the support portion 300. Through installing the bottom of support portion 300 in first installation position 111 or second installation position 112 to and also install top coil 200 on support portion 300, can conveniently realize that top coil 200 sets up with first coil unit 120 or second coil unit 130 with the distance interval of setting for, and be convenient for realize top coil 200 and tester's left shoulder or right shoulder respectively and correspond through the position of changing support portion 300 bottom. In other embodiments of the present invention, the bottom coil 100 and the top coil 200 may be fixed by additional supporting and/or mounting structures, respectively, as long as the top coil 200 can correspond to the first coil unit 120 or the second coil unit 130, respectively.

Optionally, there are various settable manners for the first mounting position 111, the second mounting position 112 and the bottom end of the supporting portion 300, as long as convenient mounting and dismounting of the bottom end of the supporting portion 300 on the first mounting position 111 and the second mounting position 112 can be realized. As shown in fig. 1 to 3, the first mounting locations 111, the second mounting locations 112 and the bottom end of the supporting portion 300 are engaged in a form of a groove and a protrusion. Specifically, the bottom plate 110 is provided with a first mounting groove and a second mounting groove along the extending direction thereof, the first mounting groove forms one mounting position (for example, the first mounting position 111), and the second mounting groove forms the other mounting position (for example, the second mounting position 112). The bottom end of the supporting part 300 is formed with a protrusion which can be fixedly mounted in the first mounting groove or the second mounting groove in a clamping manner. By adopting the clamping form of the groove and the protrusion, the bottom end of the supporting part 300 is stably arranged on the first installation position 111 or the second installation position 112, and meanwhile, the position of the top coil 200 is conveniently changed.

Further, when the bottom end position of the supporting portion 300 is adjustably inserted into the first mounting position 111 or the second mounting position 112, the two can be electrically coupled. The first mounting position 111 or the second mounting position 112 is provided with a dc pin and an ac pin. Wherein, the end of the supporting part 300 is connected with a dc pin to receive external tuning/detuning signals; the end of the supporting portion 300 is connected to the ac pin to receive an external power supply.

In an embodiment, a power supply cable, a power divider, and the like are further disposed in the supporting portion 300, an external driving power source may be connected to the power supply cable inside the supporting portion 300 through an external power supply cable, and the power divider and other circuit devices are connected through the power supply cable inside the supporting portion 300, and further, an output signal passing through the power divider may be transmitted to the coil unit of the bottom plate 110 and/or the coil unit of the top coil 200. In the embodiment of the present application, the bottom end position of the supporting portion 300 is adjustable and is inserted into the first mounting position 111 or the second mounting position 112, so that the electrical connection between the bottom plate 110 and the top coil 200 can be realized, the number of transmission lines can be effectively reduced, and the interference of the transmission lines on the main magnetic field of the system can be reduced.

Further, the first mounting groove and the second mounting groove have special cross-sectional shapes, and the bottom end of the support part 300 has a corresponding shape, so that the support part 300 can be accurately inserted into a corresponding mounting position at one time, and the top coil 200 and the first coil unit 120 or the second coil unit 130 can have an accurate relative position relationship. For example, the first and second mounting grooves may have a semicircular, non-equilateral triangular or other cross-section, and may have positioning structures in the first and second mounting grooves, respectively, to allow only the bottom end of the support 300 to be inserted into the first and second mounting grooves in a predetermined orientation.

In the above embodiments, when the top coil 200 corresponds to the first coil unit 120 or the second coil unit 130, respectively, the interval between the top coil 200 and the first coil unit 120 or the second coil unit 130 is similar to the diameter of a single coil unit. Alternatively, the distance between the top coil 200 and the first coil unit 120 or the second coil unit 130 is a fixed value or may be varied within a certain range. As shown in fig. 1 to 4, in an embodiment of the present invention, the top coil 200 and the first coil unit 120 or the second coil unit 130 form a corresponding helmholtz coil pair, and the distance between the top coil 200 and the first coil unit 120 or the second coil unit 130 is adjustable. In the radio frequency coil assembly 10 provided by this embodiment, the distance between the top coil 200 and the first coil unit 120 or the second coil unit 130 is adjustable, so that the radio frequency coil assembly 10 can adapt to shoulder joints of different sizes of more testers, and the application range of the radio frequency coil assembly 10 provided by this embodiment is improved. And in the actual magnetic resonance imaging process, the distance between the top coil 200 and the first coil unit 120 and the second coil unit 130 can be finely adjusted until the image of the magnetic resonance imaging reaches the clearest degree.

Optionally, the supporting portion 300 is disposed on the bottom plate 110 in a position adjustable along the extending direction thereof, or the top coil 200 is disposed on the supporting portion 300 in a position adjustable along the extending direction of the supporting portion 300, or both of the above manners are simultaneously adopted, so that the distance between the top coil 200 and the first coil unit 120 or the second coil unit 130 can be adjusted. As shown in fig. 4 to 6, as an implementation manner, the top coil 200 is fixedly disposed on the supporting portion 300 along the extending direction of the supporting portion 300, so that the number of structures to be adjusted is small in a single distance adjustment process, thereby saving the time consumed by the distance adjustment and improving the efficiency of adjusting the distance between the top coil 200 and the first coil unit 120 or the second coil unit 130.

As shown in fig. 4 to 6, in an embodiment of the present invention, the supporting portion 300 includes a supporting pillar 310 and a positioning clip 320, and the bottom end of the supporting pillar 310 can be installed at any installation position. The base plate 110 is disposed in a horizontal direction, and the support columns 310 extend in a vertical direction. The supporting post 310 has a sliding slot 311 along its extending direction, and the positioning clip 320 is disposed at the other end of the supporting post 310 away from the bottom plate 110. The top coil 200 includes a third coil unit 210, a sliding portion 220, and a sliding clip 230, and the sliding portion 220 and the sliding clip 230 are fixedly coupled to the third coil unit 210, respectively. The sliding portion 220 can be slidably disposed in the sliding slot 311, and the positioning fastener 320 can be fastened to the sliding fastener 230 at any position, so as to fix the top coil 200 along the extending direction of the supporting column 310. In the process of adjusting the distance between the top coil 200 and the first coil unit 120 or the second coil unit 130, the positioning fastener 320 releases the sliding fastener 230, the third coil unit 210 is lifted and lowered on the supporting column 310 through the sliding portion 220, and when the third coil unit 210 slides to a proper position (taking the magnetic resonance image as the clearest standard), the positioning fastener 320 is used again to clamp the sliding fastener 230, so as to fix the top coil 200 and the supporting column 310, and the distance between the top coil 200 and the first coil unit 120 or the second coil unit 130 is adjusted.

Specifically, as shown in fig. 4-6, the positioning clip 320 includes a pawl 322 and a return spring 323, and the slide clip 230 includes a ratchet. In the non-operating state, the pawl 322 catches with the ratchet on the top coil 200, and the distance between the third coil unit 210 and the bottom coil 100 is fixed. When the top coil 200 is used, the button 321 at the top of the pawl 322 drives the pawl 322 to rotate, the pawl 322 is opened to be separated from the ratchet, and the top coil 200 can move in the height direction. Adjusting the third coil unit 210 and the bottom coil 100 to the proper spacing, the button 321 is lowered and the pawl 322 recoils with the ratchet under the influence of the return spring 323. Specifically, one end of the return spring 323 is fixed to the support pole 310, and the other end of the return spring 323 abuts against the end of the pawl 322 remote from the button 321. Fig. 1 and 4 show two states of the rf coil assembly 10 with a large pitch and a small pitch, respectively. The third coil unit 210 can slide up and down with respect to the support column 310 by the movement of the sliding portion 220 in the form of a sliding roller within the slide groove 311 of the support column 310. In other embodiments of the present invention, the adjustment of the distance between the third coil unit 210 and the first coil unit 120 or the second coil unit 130 may be implemented by using an additional lifting assembly, such as a chain, a lead screw, or other manners.

As shown in fig. 4-6, in an embodiment of the present invention, the supporting portion 300 further includes an adjustable reset unit 330, and the adjustable reset unit 330 is disposed between the supporting pole 310 and the top coil 200. When the top coil 200 approaches the bottom plate 110 along the extending direction of the supporting pillar 310, it pushes one end of the adjustable reset element 330, and the adjustable reset element 330 elastically deforms and pushes the top coil 200 in a direction away from the bottom plate 110. During the process of lifting the top coil 200, after the operator drives the positioning clip 320 to release the sliding clip 230, the operator continues to press the top of the top coil 200, thereby driving the top coil 200 to descend (close to the bottom coil 100). When the top coil 200 is moved to the proper position relative to the first coil unit 120 or the second coil unit 130, the positioning clip 320 is allowed to continue to grip the sliding clip 230, thereby securing the top coil 200 relative to the bottom coil 100. During the lowering of the top coil 200, the adjustable restoring member 330 is subjected to a pressure to generate an elastic deformation and apply an upward pushing force to the top coil 200. When the top coil 200 needs to be lifted, after the operator drives the positioning clamping piece 320 to loosen the sliding clamping piece 230, the adjustable reset piece 330 pushes the top coil 200 upwards to a proper position, and then the positioning clamping piece 320 is used for continuously clamping the sliding clamping piece 230, so that the top coil 200 is fixed relative to the bottom coil 100. The adjustable reset member 330 is provided to facilitate the height adjustment of the top coil 200 by an operator, and optionally, the adjustable reset member 330 may be a spring, an elastic rubber, or other structure capable of generating elastic deformation.

As shown in fig. 7-8, an embodiment of the present invention also provides a local coil comprising a local receive coil 20 and the radio frequency coil assembly 10 of any of the above aspects, which provides the same advantages as the radio frequency coil assembly 10 of the above embodiments. Further, the types of the local coil include a shoulder joint local coil, the first coil unit 120 corresponds to the left shoulder of the tester, and the second coil unit 130 corresponds to the right shoulder of the tester, so that the magnetic resonance imaging of the two shoulders of the tester can be realized under the condition that the body position of the tester is not changed. Furthermore, the local receiving coil 20 is made of a flexible material. The local receiving coil 20 made of flexible material can be attached to the shoulder of the tester more closely, so that the imaging quality of the shoulder joint of the tester is improved. It will be appreciated that the flexible local receive coil 20 also provides improved adaptability to different tester shoulder joint sizes. Alternatively, the number of local receive coils 20 may be one, two, or even more. One local receiving coil 20 is used continuously to satisfy the magnetic resonance imaging of both shoulders of the testee, and two local receiving coils 20 can allow the magnetic resonance imaging of both shoulders of the testee to be realized only by moving the top coil 200. As an implementable manner, the local receiving coil 20 uses a semi-flexible shoulder coil, i.e. a twelve-channel shoulder joint coil, which can flexibly wrap the shoulder, can perfectly fit the shoulder with different sizes, and has better comfort for the tester.

In one embodiment, the radio frequency coil assembly 10 and the local receive coil 20 share a transmission cable, which may include a tuning/detuning cable, a power supply drive cable. Wherein the tuning/detuning cable is used for tuning and detuning the radio frequency coil assembly 10, and the tuning/detuning cable is used for tuning and detuning the local receiving coil 20; the power drive cable is used to provide a drive signal to the radio frequency coil assembly 10 and to provide a drive signal to the local receive coil 20. Illustratively, when the radio frequency coil assembly 10 is in a state of transmitting radio frequency pulses, the tuning/detuning cable provides a detuning signal such that the local receiving coil 20 is in a detuned state; when the local receive coil 20 is in a receive magnetic resonance signal state, the tuning/detuning cable provides a detuned signal such that the radio frequency coil assembly 10 is in a detuned state. The power drive cable may provide drive power to both the radio frequency coil assembly 10 and the local receive coil 20.

An embodiment of the invention also provides a magnetic resonance system comprising a local coil as described in any of the above embodiments. Specifically, the magnetic resonance system includes a patient bed, a base plate 110, and a top coil 200. The base plate 110 is disposed on and electrically connected to a patient bed, the first coil unit 120 and the second coil unit 130 are disposed in the base plate 110, and the first coil unit 120 and the second coil unit 130 are disposed at an interval or adjacent to each other along an extending direction of the base plate 110. The top coil 200 is movably disposed on the upper surface of the base plate 110 and electrically connected to the patient's bed, and the top coil 200 forms an open detection space with the first coil unit 120 and/or the second coil unit 130. Further, the magnetic resonance system also includes a local receive coil 20 and a support 300. The local receiving coil 20 is arranged in the open detection space, the bottom end of the supporting part 300 is movably arranged on the upper surface of the bottom plate 110, and the supporting part 300 extends along the vertical direction; the top coil 200 is disposed on the support 300, and the position of the top coil 200 along the extending direction of the support 300 is greater than (higher than) or equal to the size of the local receiving coil 20 along the extending direction of the support 300.

In the embodiment of the present application, the bottom plate 110 and the top coil 200 are respectively configured to have an opening structure in the left-right direction and the front-back direction, so as to well accommodate the scanned portion of the object. An end of the base plate 110 adjacent to the first mounting location 111 or the second mounting location 112 is higher than an end of the base plate 110 adjacent to the first coil unit 120 or the second coil unit 130, so that an arc-shaped recess is formed on the surface of the base plate 110 to better fit the shoulder of the scanning object.

Furthermore, the magnetic resonance system provided by the embodiment belongs to a high-field magnetic resonance system, such as a 7T, 9.4T, 11T, and the like system with a field strength of 5T or higher. In the magnetic resonance system, the first coil unit 120 and the second coil unit 130 in the bottom coil 100 can respectively correspond to different portions to be imaged by a tester, and the top coil 200 can respectively form a helmholtz coil pair with the first coil unit 120 or the second coil unit 130. In the detection process, the top coil 200 is respectively installed on the installation positions corresponding to different parts of the tester, so that different body parts of the tester can be conveniently imaged, and then the magnetic resonance imaging of different parts of the tester is realized under the condition of not changing the body position of the tester.

In the above embodiment, as shown in fig. 9, the radio frequency coil assembly 10 and the local receiving coil 20 operate independently, the radio frequency coil assembly 10 is connected to the connector 50 through the transmitting coil port 30, and the local receiving coil 20 is connected to the connector 50 through the receiving coil port 40. When the radio frequency coil assembly 10 is in operation, the local receive coil 20 is in a detuned state; the transmission of the radio frequency coil assembly 10 is terminated and the radio frequency coil assembly enters a detuning state, wherein the detuning is controlled by a control signal output by a magnetic resonance system plug and is given to a detuning plate to realize the detuning of the radio frequency coil assembly 10. The radio frequency coil assembly 10 is detuned and the local receive coil 20 is operated in a manner similar to a conventional coil to which the local receive coil 20 is configured and operated, and is connected to the system by a connector 50. The radio frequency coil assembly 10 and the local receive coil 20 may be collectively connected to a receptacle of a magnetic resonance system, such as a patient bed, via a connector 50.

In an embodiment of the present invention, as shown in fig. 10, which is a schematic diagram of a power supply circuit of the rf coil assembly 10, taking an example that the third coil unit 210 and the first coil unit 120 form a helmholtz coil pair, a power supply cable is connected to the power divider 60; there is then a coupling circuit 70 at the end of both the first coil unit 120 and the third coil unit 210. The two coupling circuits 70 are electrically connected to the first coil unit 120 and the third coil unit 210, respectively. In the present embodiment, the driving signals of the first coil unit 120 and the third coil unit 210 are in phase, i.e., there is no phase difference between the driving signals of the two coil units.

The bottom end of the supporting part 300 can be inserted into the first mounting position 111 or the second mounting position 112 in an adjustable position, and can be electrically coupled with each other. The first mounting position 111 or the second mounting position 112 is provided with a dc pin and an ac pin. Wherein, the end of the supporting part 300 is connected with a dc pin to receive external tuning/detuning signals; the end of the supporting portion 300 is connected to the ac pin to receive an external power supply. In one embodiment, the radio frequency coil assembly 10 and the local receive coil 20 share a transmission cable, which may include a tuning/detuning cable, a power supply drive cable. Wherein the tuning/detuning cable is used for tuning and detuning the radio frequency coil assembly 10, and the tuning/detuning cable is used for tuning and detuning the local receiving coil 20; the power drive cable is used to provide a drive signal to the radio frequency coil assembly 10 and to provide a drive signal to the local receive coil 20.

In an embodiment, tuning/detuning circuits are connected to the coil units of the radio frequency coil assembly 10 and/or the local receive coil 20, respectively. Fig. 11 is a schematic diagram of a tuning/detuning circuit connected to the coil unit of the radio frequency coil assembly 10 and/or the local receiving coil 20 according to an embodiment of the present invention, which includes capacitors C1 and C2 and an inductor L1 connected in series to form a resonant tank, and a diode D1 connected in parallel to two ends of the resonant tank. The tuning/detuning circuitry is typically in series relationship with the coil elements of the radio frequency coil assembly 10 and/or the local receive coil 20. When the rf coil assembly 10 and/or the local receiving coil 20 receives a driving signal (e.g., a voltage source), the two terminals of the diode are turned off in the opposite direction, the resonant tank is not operated, and the rf coil assembly 10 and/or the local receiving coil 20 are in a tuning state. When the rf coil assembly 10 and/or the local receiver coil 20 receives a dc control current signal, the diode is turned on, and the inductor and the capacitor form a resonance, which is equivalent to connecting a high impedance in series in the antenna, and the rf coil assembly 10 and/or the local receiver coil 20 are in a detuned state.

In an embodiment, the third coil unit 210 and the first coil unit 120 form a helmholtz coil pair as an example. When the radio frequency coil assembly 10 is in the state of transmitting radio frequency pulses, the tuning/detuning cable provides a detuning signal so that the local receiving coil 20 and the second coil unit 130 are both in a detuned state, and only the third coil unit 210 and the first coil unit 120 are in an activated state to transmit radio frequency pulses; when the local receive coil 20 is in a receive magnetic resonance signal state, the tuning/detuning cable provides a detuned signal such that the radio frequency coil assembly 10 is fully in a detuned state. The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.