Head coil for low-field magnetic resonance imaging

Abstract

The utility model relates to a head coil for low-field magnetic resonance imaging, which relates to the technical field of human body scanning diagnosis and comprises a first group of coil units for surrounding the front end and the rear end of a head and a second group of coil units for surrounding the upper half part and the lower half part of the head, and a coil unit field formed by the first group of coil units and the second group of coil units is an orthogonal field. During use, the first coil unit for surrounding the front end and the rear end of the head and the second coil unit for surrounding the upper half part and the lower half part of the head are used, so that full surrounding of the head is realized, and relatively three-dimensional multi-angle imaging information can be obtained; meanwhile, as the coil unit fields formed by the first group of coil units and the second group of coil units are orthogonal fields, mutual interference between the coil units can be avoided due to the orthogonality between the coil unit fields, the signal-to-noise ratio of the coil is improved, the image quality is improved, and a doctor can make accurate judgment conveniently.

Description

Technical Field

[0001] The utility model relates to the technical field of human body scanning diagnosis, in particular to a head coil used for low-field magnetic resonance imaging. Background Art

[0002] Magnetic resonance imaging (MRI) is a medical imaging technique that uses strong magnetic fields and radio waves to generate detailed images of the internal structures of the human body. MRI is suitable for scanning human tissue to obtain detailed anatomical structure and tissue information. It has the advantages of high resolution, multi-parameters, and non-invasiveness in medical imaging, providing important information and support for clinical diagnosis and treatment. At the same time, no radioactive substances or contrast agents are required during the MRI scan. Compared with other imaging techniques, such as CT scans or X-rays, MRI does not pose a radiation risk to the human body and is a safe imaging method.

[0003] During MRI imaging, high-quality images are the guarantee of diagnostic accuracy, so the performance of the radio frequency coil will directly affect the quality of the magnetic resonance image. In the prior art, coils are divided into the following categories according to their scope of use: full volume coils, partial volume coils, and surface coils. A full volume coil generally refers to a cylindrical coil that can wrap the entire or a certain position. Currently, the magnetic resonance scanning head mostly uses a full volume coil for scanning. The coil is designed as a spiral tube coil or a birdcage coil, and the imaging plane is generally one.

[0004] In the prior art, when a low-field magnetic resonance imaging system uses a full-volume coil, magnetic resonance detection is performed on the head to form a brain image in a single imaging plane. The signal-to-noise ratio of the brain image is affected, resulting in the accuracy of the brain image result being affected. Utility Model Content

[0005] The technical problem solved by the utility model is to solve the problem in the prior art that the image signal-to-noise ratio cannot be improved during the magnetic resonance imaging process.

[0006] The utility model can be implemented through the following technical scheme: a head coil for low-field magnetic resonance imaging, comprising a first group of coil units for surrounding the front end and the rear end of the head and a second group of coil units for surrounding the upper half and the lower half of the head, the coil unit field formed by the first group of coil units and the second group of coil units is an orthogonal field.

[0007] A further technical improvement of the utility model is that the first group of coil units includes a first coil unit for surrounding the front end of the head and a second coil unit for surrounding the rear end of the head, and there is an overlapping area between the first coil unit and the second coil unit.

[0008] A further technical improvement of the utility model is that the second group of coil units includes a third coil unit for surrounding the upper half of the head and a fourth coil unit for surrounding the lower half of the head, and there is an overlapping area between the third coil unit and the fourth coil unit.

[0009] A further technical improvement of the present invention is that the coil unit fields formed by the first coil unit, the third coil unit and the fourth coil unit are orthogonal fields.

[0010] A further technical improvement of the present invention is that the coil unit fields formed by the second coil unit, the third coil unit and the fourth coil unit are orthogonal fields.

[0011] A further technical improvement of the utility model is that the first coil unit, the second coil unit, the third coil unit and the fourth coil unit adopt partial volume coils.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] 1. When in use, the present application uses a first group of coil units that surround the front and rear ends of the head and a second coil unit that surrounds the upper and lower parts of the head to achieve full encirclement of the head and obtain more three-dimensional multi-angle imaging information. At the same time, since the coil unit field formed by the first group of coil units and the second group of coils is an orthogonal field, the orthogonality between the coil unit fields can avoid mutual interference between the coil units, improve the signal-to-noise ratio of the coil, thereby improving the quality of the image, and facilitating doctors to make accurate judgments.

[0014] 2. In the present application, partial volume coils are used for the first coil unit, the second coil unit, the third coil unit and the fourth coil unit. The partial volume coils form two imaging planes due to the joint action of the volume coils and the surface coils, which can effectively receive signals, improve the resolution and sensitivity to the area, and thus improve the clarity and accuracy of imaging.

[0015] 3. The present application reduces interference when adjacent unit coils have partial overlap by creating a partial overlap between the first coil unit and the second coil unit, and a partial overlap between the third coil unit and the fourth coil unit, so that the sum of the magnetic fluxes passing through and returning to the overlapping parts is zero, thereby improving the signal-to-noise ratio and thus improving image quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to facilitate understanding by those skilled in the art, the present invention is further described below in conjunction with the accompanying drawings.

[0017] Figure 1 It is a schematic diagram of the magnetic resonance surface coil for low-field head imaging of the utility model;

[0018] Figure 2 It is a schematic diagram of the positions of the head coil upper frame and the head coil lower frame of the utility model;

[0019] Figure 3 It is a schematic diagram of the positions of the head coil upper shell and the head coil lower shell of the utility model.

[0020] In the figure: 1. first coil unit; 2. second coil unit; 3. third coil unit; 4. fourth coil unit; 5. head coil upper frame; 6. head coil lower frame; 7. head coil upper shell; 8. head coil lower shell. DETAILED DESCRIPTION

[0021] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0022] In order to improve the signal-to-noise ratio of magnetic resonance images, the present application adopts a partial volume coil design that combines a volume coil and a surface coil structure. The partial volume coil forms two imaging planes due to the joint action of the volume coil and the surface coil, which can effectively receive signals, improve the resolution and sensitivity of the area, and thus improve the clarity and accuracy of imaging.

[0023] For details, please refer to Figure 1-3 As shown, a head coil for low-field magnetic resonance imaging includes a first group of coil units for surrounding the front and rear ends of the head and a second group of coil units for surrounding the upper and lower parts of the head. When in use, the first group of coil units and the second group of coil units can form a plurality of imaging planes, and correct each other according to the obtained imaging planes, so as to receive signals more effectively, facilitate the acquisition of multi-angle image information, improve the resolution and sensitivity of the area, and obtain a more accurate brain image.

[0024] The first group of coil units includes a first coil unit 1 and a second coil unit 2, wherein the first coil unit 1 and the second coil unit 2 are butterfly-shaped, and there is an overlapping area between the first coil unit 1 and the second coil unit 2. When in use, the first coil unit 1 is used to surround the front end of the head, and the second coil unit 2 is used to surround the rear end of the head. At the same time, adjacent unit coils are partially overlapped, which can reduce interference and make the sum of the magnetic flux passing through and returning to the overlapping part zero, which can improve the signal-to-noise ratio and thus improve the image quality.

[0025] The second group of coil units includes a third coil unit 3 and a fourth coil unit 4, wherein the third coil unit 3 and the fourth coil unit 4 are in a solenoid coil structure, and there is an overlapping area between the third coil unit 3 and the fourth coil unit 4. When in use, the third coil unit 3 is used to surround the upper half of the head, and the fourth coil unit 4 is used to surround the lower half of the head. At the same time, adjacent coils are partially overlapped, which can reduce interference and make the sum of the magnetic flux passing through and returning to the overlapping part zero, which can improve the signal-to-noise ratio and thus improve the image quality.

[0026] As a further embodiment of the present application, in order to improve the uniformity and signal-to-noise ratio of the coil, the magnetic fields of the first coil unit 1 and the third coil unit 3 and the fourth coil unit 4 in the coil are orthogonal fields, thereby reducing the coupling between the first coil unit 1 and the third coil unit 3 and the fourth coil unit 4. Due to the orthogonality between the coil unit fields, mutual interference between the coil units can be avoided, the signal-to-noise ratio of the coil is improved, thereby improving the image quality.

[0027] Furthermore, the magnetic fields of the second coil unit 2 and the third coil unit 3 and the fourth coil unit 4 in the coils are orthogonal fields, which can reduce the coupling between the second coil unit 2 and the third coil unit 3 and the fourth coil unit 4. Due to the orthogonality between the coil unit fields, mutual interference between the coil units can be avoided, the signal-to-noise ratio of the coil is improved, thereby improving the image quality.

[0028] In the present application, the first coil unit 1 is installed on the head coil upper frame 5, the second coil unit 2 is installed on the head coil lower frame 6, the third coil unit 3 is installed on the head coil upper shell 7, and the fourth coil unit 4 is installed on the head coil lower shell 8, thereby respectively realizing the installation of the first coil unit 1, the second coil unit 2, the third coil unit 3 and the fourth coil unit 4.

[0029] The surface coil for low-field MRI head imaging proposed in this patent has a simple structure and is designed to be close to human tissue. The orthogonal structure design avoids coupling between channels, reduces noise reception, and increases the uniformity of the radio frequency field, which can effectively improve the signal-to-noise ratio and uniformity of low-field MRI brain images.

[0030] According to clinical needs, the structural dimensions of the coil are designed, such as parameters such as the inner and outer radii of the coil, and the imaging range of the coil is clarified. Since low-field MRI supports up to 4-channel RF requirements, in order to ensure the signal-to-noise ratio of the coil, the coil is designed as a 4-channel coil, and the resonant frequency of the coil is adjusted to the operating frequency of the MRI system and matched to 50 ohm to minimize the dissipation of the received signal.

[0031] When in use, the utility model realizes the reception of H proton magnetic resonance signals by setting a 4-channel partial volume coil for head imaging, which works at the corresponding system Larmor frequency. The design of the coil is close to the tissue, which is beneficial to improving the resolution, sensitivity and signal-to-noise ratio of brain magnetic resonance images, and helping doctors make more accurate diagnoses.

[0032] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A head coil for low-field magnetic resonance imaging, characterized in that: It comprises a first group of coil units for surrounding the front and rear ends of the head and a second group of coil units for surrounding the upper and lower parts of the head, wherein the coil unit fields formed by the first and second groups of coil units are orthogonal fields.

2. A head coil for low-field magnetic resonance imaging according to claim 1, characterized in that: The first group of coil units comprises a first coil unit (1) for surrounding the front end of the head and a second coil unit (2) for surrounding the rear end of the head, and the first coil unit (1) and the second coil unit (2) have an overlapping area.

3. A head coil for low-field magnetic resonance imaging according to claim 2, characterized in that: The second group of coil units comprises a third coil unit (3) for surrounding the upper half of the head and a fourth coil unit (4) for surrounding the lower half of the head, and the third coil unit (3) and the fourth coil unit (4) have an overlapping area.

4. A head coil for low-field magnetic resonance imaging according to claim 3, characterized in that: The coil unit fields formed by the first coil unit (1) and the third coil unit (3) and the fourth coil unit (4) are orthogonal fields.

5. The head coil for low-field magnetic resonance imaging according to claim 3, characterized in that: The coil unit fields formed by the second coil unit (2) and the third coil unit (3) and the fourth coil unit (4) are orthogonal fields.

6. The head coil for low-field magnetic resonance imaging according to claim 3, characterized in that: The first coil unit (1), the second coil unit (2), the third coil unit (3) and the fourth coil unit (4) are partial volume coils.

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