KR100346742B1 - Radio frequency coil fro magnetic resonance image system - Google Patents

Abstract

PURPOSE: A high frequency receiving coil for a magnetic resonance image device is provided to use a high frequency coil for vertical magnetic fields in the shape of solenoid with maximum opened area, thereby simply carrying out the simple operations or organization inspection via the opened area. CONSTITUTION: A high frequency receiving coil for a magnetic resonance image device is divided into upper and lower coils wounding an annular part at upper and lower parts respectively. The upper coil(2) has a coil and a former(5) formed of a cover and a coil base respectively provided at upper and lower parts of the coil. Non-conductive adhesive is filled in a space between the coil and the former, so that the coil cover, the coil and the coil base are integrated into an upper coil structure.

Description

Radio frequency coil fro magnetic resonance image system for reception of magnetic resonance imaging apparatus

The present invention relates to a high frequency coil for receiving a magnetic resonance imaging apparatus.

Magnetic resonance imaging apparatus is an image diagnostic apparatus widely used for diagnosing various diseases through the wound image by the magnetic resonance signal. This device uses a magnetic field that is completely harmless to the human body compared to X-ray CT, so it is not harmful to long-term shooting or a large number of shots. Dimensional tomography images can be obtained. The high frequency coil in the MRI plays a role of transmitting high frequency electromagnetic waves to a human body or receiving a magnetic resonance signal from the human body in order to cause a magnetic resonance phenomenon. Recently, in order to make a patient with obstructive phobia more comfortable, or to insert a needle for histological examination or to perform simple surgery while taking a magnetic resonance imaging, an open type magnetic resonance imaging apparatus has been widely used. In order to make an open magnetic resonance imaging apparatus, as shown in FIG. 1, first, the structure of the main magnet 100 forming the main magnetic field must be open, and the inclined magnetic field coil (not shown) making the inclined magnetic field must also have an open structure. . In the clinical diagnostic magnetic resonance imaging apparatus, the high frequency coil is generally divided into a transmitting high frequency coil and a receiving high frequency coil. The transmitting high frequency coil needs to be made as large as possible to increase patient comfort, and the receiving high frequency coil 200 (receiving high frequency coil) is attached as close to the affected part (head) of the human body as possible as shown in FIG. 1. If you increase the signal-to-noise ratio of the magnetic resonance video signal, you can obtain a precise image. In addition, the receiving high frequency coil needs to have a structure of the maximum open form in accordance with the open structure. In a vertical magnetic resonance imaging apparatus, a receiving high frequency coil having the largest open structure for such a requirement can be made possible by a solenoid type structure.

In the conventional non-open magnetic resonance imaging apparatus, a high frequency coil having a structure in which a coil made of an electrical conductor is disposed on a cylindrical former has been widely used, and a solenoid type, saddle type, and a cage (according to the coil shape) are used. Coil structures such as birdcage type were used. The dual solenoid and saddle types are used in less than 0.5 tesla hypoallergenic magnetic resonance imaging devices, and the birdcage type is used in many higher magnetic resonance imaging systems. They are all designed to have excellent sensitivity and high magnetic field uniformity in the shooting space. However, since these structures are all cylindrical structures, they cannot be used as a transmitting coil in an open magnetic resonance imaging apparatus and can be mainly used only for receiving. However, in the open structure, the receiving coil has a strong tendency to require a receiving coil having the maximum open structure. Lose. However, conventional coils for receiving coils are mainly made of copper, and the degree of openness varies according to the width of the copper plate, and a narrow copper plate is difficult to use in order to improve the signal-to-noise ratio. Therefore, the opening degree of the upper coil can only be narrowed, and the conventional coil is made almost closed. However, the solenoid type coil has more open sections than other types, so it is suitable for the open type. Moreover, only the solenoid type is possible in the vertical magnetic resonance imaging apparatus. In the manufacture of the receiving coil of the solenoid type, in order to facilitate the in-coil insertion of the patient, as shown in FIG. 2, a separate type mainly divided into the upper coil part 10 and the lower coil part 20 is manufactured. 2 is a front view of the solenoid coil. As shown in FIG. 3, the upper coil 10 is generally manufactured by dividing the upper coil 10 into a coil pedestal 3, a coil 2, a coil cover 1, and the like. 3 is a disassembled cross-sectional view of a portion of the upper coil 10 of FIG. 2 taken along the line AA ′, and FIG. 4 is a side view of the solenoid coil of FIG. 2. In FIG. 3, the assembly line 4 is a line generated when the coil pedestal 3 and the coil cover 1 are coupled to each other.

Therefore, as there are many kinds of parts, errors in the manufacturing process are inevitably generated, and they are not only hateful in appearance, but also divided into pieces of pieces, so that internal spaces are generated during assembly, so problems such as cracking, cracking, and splitting of coil formers Occurs. In particular, when the material of the outer former is made of FRP (Fiberglass Reinforced Plastic), the error in the process dimension becomes more severe, otherwise there is a disadvantage in that the manufacturing cost due to the die and mold is high.

In addition, in order to reinforce the weak part of the external form former in the structure may be attached to the pedestal between the coil winding, which has the disadvantage of reducing the open section of the open structure.

The present invention has been made to improve the above-mentioned problems, and in the manufacture of a high-frequency coil for receiving a magnetic resonance image signal installed in a magnetic field of a main magnet forming a vertical magnetic field to maximize the open section of the upper coil It is an object of the present invention to provide a high frequency coil for receiving in which a coil cover, a coil and a coil support are integrated.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a diagram showing an arrangement position of a receiving high frequency coil in a magnetic resonance imaging apparatus.

2 is a front view of a high frequency coil for receiving a conventional magnetic resonance imaging apparatus;

3 is a disassembled cross-sectional view of a cut along the line AA ′ of FIG. 2;

4 is a side view of the high frequency coil for reception of FIG. 2;

5 is a front view of a high-frequency coil for three-wire solenoid type receiving according to the present invention,

6 is a side view when the side cover is removed from the receiving high frequency coil of FIG. 5;

7 is a side view of the high frequency coil for reception of FIG. 5;

8 is a cross-sectional view of the upper solenoid coil of the high frequency coil for receiving of FIG. 5.

<Description of the symbols for the main parts of the drawings>

1. Coil cover 2. Coil (copper pipe)

3. coil pedestal 4. assembly line

5. Integral former 6. Side cover

7. Coil cover cross section 8. Coil base cross section

9. Connector junction 10. Upper coil structure

20. Lower coil structure

In order to achieve the above object, a high frequency coil for receiving a magnetic resonance imaging apparatus according to the present invention is an open type high frequency coil for receiving a magnetic resonance imaging apparatus having a plurality of windings, wherein the high frequency coil for receiving is a ring portion. It is divided into an upper coil and a lower coil, which are formed in an upper and lower wrapping form, and the upper coil includes a former having a coil cover and a coil support provided above and below the coil and the coil, and a non-conductive adhesive between the coil and the former. Filled by the coil cover, characterized in that it comprises an upper coil structure made of a coil and a coil support integrally.

In the present invention, the upper coil structure, the coil between the upper coil cover, the coil and the base of the coil is filled with non-conductive epoxy, resin for FRP or adhesive, the upper coil structure is preferably made of only the former foamer and coil material In addition, the upper coil structure is preferably manufactured by forming the respective coilers for each coil winding without using the integrated outer former in order to have the maximum open space, the tuning circuit located on the side in the upper coil structure It is preferable that the side cover is provided on the side surface so that the adjustment part can be adjusted.

Hereinafter, a high frequency coil for receiving a magnetic resonance imaging apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

In the present invention, when manufacturing a high frequency coil for receiving vertically separated solenoid type having a maximum opening structure in the vertical magnetic field magnetic resonance imaging apparatus for the main magnetic field, the maximum open structure is avoided by breaking away from the conventional cylindrical closed form former. The branch provides a high frequency coil for receiving. In particular, the number of parts generated during the production of the outer former is minimized, and in the production of the outer former of the upper coil, the parts are integrated and the copper pipes used for the coils are buried therein, so that the dimensional error is small and the manufacturing process is simple. Provide credit high frequency coil. Therefore, the high frequency coil for receiving is characterized in that the solenoid-type coil is adopted, and the upper coil is made of copper pipe to maximize the open section, and the upper coil pedestal, the winding and the coil cover are integrated.

5 is a front view of a high frequency coil for reception of a magnetic resonance imaging apparatus according to the present invention. As shown, the receiving high frequency coil is a receiving high frequency coil having a plurality of windings in a magnetic field of a main magnet forming a vertical magnetic field, wherein the receiving high frequency coil is divided into an upper coil 2 and a lower coil, A coil cover, a coil, and a coil support of the upper coil 2 are provided with an upper coil structure that is integrally manufactured. That is, it is formed of an upper coil structure wrapped around the upper coil 2 by an integral former 5 in which a conventional upper former (coil cover) and a lower former (coil pedestal) are combined. Here, the unitary upper coil structure has a form surrounding the coil 2 inside the unitary former 5 in which the upper coil pedestal and the upper coil cover are combined, and between the coil 2 and the unitary former 5 in the inner portion. Filled with malleable epoxy, resin for FRP or adhesive. The upper coil structure is provided with a side cover on the side to adjust the tuning circuit adjustment component located on the side. The upper coil structure may be made of only the outer former 5 and the coil 2 material without attaching a tuning circuit component or the like. In addition, the upper coil structure may be made of each former for each coil winding without using the integrated outer former 5 in order to have the maximum open space.

Such a high frequency coil for receiving has a maximum open area based on a solenoid type high frequency coil which is capable of obtaining an MRI image in the magnetic field of the main magnet and performing an operation at the same time. do. That is, the high frequency coil for receiving the magnetic resonance imaging apparatus according to the present invention is divided into two parts, the upper coil structure 10 and the lower coil structure 20, as shown in FIG. It is a separate form to facilitate the inlet, and the coil material of the solenoid-shaped coil (2) is manufactured by using a copper pipe, the size of the outer former (5) can be minimized. This, as shown in Figure 6, by having an open section, such as "ga" to "la" section, thereby having a maximum opening section. The upper coil structure 10 and the lower coil structure 20 are connected to each other by a connector provided in the connector block. It can be seen that the upper coil structure 10 of FIG. 5 eliminates the assembly line 4 generated during the assembly process as compared with the conventional upper high frequency coil structure of FIG. 2. The conventional high frequency coil shown in FIG. 2 is divided into a coil cover 1, a coil 2 made of copper pipe or copper plate, a coil support 3, and the like, and the coil cover 1 and the coil. This is because the coil 2 is inserted between the pedestals 3 and assembled. Such an assembly line 4 is necessarily generated in the conventional high frequency coil, which is unsatisfactory in appearance and causes manufacturing errors and assembly errors, and there is a possibility that pieces of magnetic material are introduced into the gaps, in which case the image The quality of life will be severely affected. In addition, due to the occurrence of the space between the coil cover and the coil, the coil and the coil pedestal, safety problems such as cracking and cracking due to external impact are likely to occur. Therefore, as illustrated in FIG. 8, the coil cover and the coil pedestal are integrated to form a coil former, and the coil is inserted therein to fill the inside to solve the above problems. The coil former is made of non-magnetic material and is made of non-conductive material such as acrylic or plastic, ABS (Acrylonitrile Butadiene Styrenecopolymer) resin, and FRP. In the manufacturing method, the coil pedestal is manufactured according to the design, and then the copper pipe or copper plate, which is the coil, is cut and bent, and the coil is coupled to the coil pedestal. After that, the coil cover is integrally bonded, assembled and bonded after FRP or epoxy is filled and fabricated to be integrated. At this time, the winding end of each coil is processed to be flat for easy connection with the connector. In general, the reason for manufacturing the coil pedestal and the coil cover is separated from each other for the post-treatment, tuning and tuning circuit modification of the coil, but in the solenoid-type high frequency coil used in the present invention, the upper coil uses a copper pipe. It is manufactured without any tuning circuit and there is no coil, so there is no need for post-processing or tuning circuit modification. Therefore, the coil cover, the coil, and the coil support do not need to be removed at all. On the other hand, as shown in Figure 7, the necessity of the side cover (6) is necessary for connecting the upper coil (2) with the lower coil and the separation of the cover is simpler structure than the conventional coil cover and minimal production This has the advantage of generating a line.

As described above, the receiving high frequency coil for the magnetic resonance imaging apparatus according to the present invention uses a high frequency coil for the vertical magnetic field manufactured in the form of a solenoid, but the copper material is used for the coil material to provide the maximum open area and the head. It can be applied to both body and limb receiving coil. Therefore, there is an advantage that simple surgery or histological examination can be performed through the open area, and the coil cover, coil, coil support of the upper coil is manufactured integrally, thereby reducing the assembly process and eliminating the assembly line generated in the outer former. All problems caused by the assembly process are eliminated.

Claims (5)

In the open type high frequency coil of a magnetic resonance imaging device having a plurality of windings, The receiving high frequency coil is separated into an upper coil and a lower coil formed in a form of wrapping around the upper and lower portions of the affected part, The upper coil has a former having a coil cover and a coil support provided above and below the coil and the coil, and the coil cover, the coil and the coil support are integrally manufactured by being filled with a non-conductive adhesive between the coil and the former. A high frequency coil for receiving a magnetic resonance imaging apparatus, characterized in that it comprises an upper coil structure. The method of claim 1, The high-frequency coil for receiving a magnetic resonance imaging apparatus, characterized in that the upper coil structure, the upper coil cover, the coil and the coil pedestal is filled with a non-conductive epoxy, resin for FRP (Fiberglass Reinforced Plastic) or adhesive. The method of claim 1, The upper coil structure is a high frequency coil for receiving a magnetic resonance imaging apparatus, characterized in that the outer former and the coil material. The method of claim 1, The upper coil structure is a high frequency coil for receiving a magnetic resonance imaging apparatus, characterized in that the plurality of windings are made of each former for each coil winding without using an integrated external former to have a maximum open space. The method of claim 1, A high frequency coil for receiving a magnetic resonance imaging apparatus, characterized in that the side cover is provided on the side to adjust the tuning circuit adjustment component located on the side in the upper coil structure.

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