CN211325033U - Gradient coil and magnetic resonance scanning device - Google Patents
Gradient coil and magnetic resonance scanning device Download PDFInfo
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- CN211325033U CN211325033U CN201922268830.3U CN201922268830U CN211325033U CN 211325033 U CN211325033 U CN 211325033U CN 201922268830 U CN201922268830 U CN 201922268830U CN 211325033 U CN211325033 U CN 211325033U
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Abstract
The utility model relates to a gradient coil and magnetic resonance scanning equipment. The gradient coil comprises a main coil group and is cylindrical; the shielding coil group is sleeved outside the main coil group in a cylindrical shape; the main coil group is provided with an annular limiting part protruding towards one side far away from the shielding coil group along the circumferential direction. The utility model provides a gradient coil and magnetic resonance scanning equipment, the interval is great between the interior perisporium of the cyclic annular spacing portion of the main coil group of gradient coil and the shielding coil group, can reach sufficient intensity and climbing rate in the imaging area of requirement, and the internal diameter of the cyclic annular spacing portion of main coil group is littleer, the event makes gradient coil more be close to the particular site by the person who detects, the event is when carrying out the particular site magnetic resonance scanning to the person who is detected, can obtain clear magnetic resonance image by person's particular site that is detected, improve the doctor to the accuracy of being detected the person's state of an illness diagnosis.
Description
Technical Field
The utility model relates to the technical field of medical equipment, especially, relate to a gradient coil and magnetic resonance scanning equipment.
Background
The magnetic resonance scanning device is a very critical imaging device in a hospital and plays a crucial role in the examination of the patient's focus. An existing magnetic resonance scanning apparatus generally includes a hollow housing having a receiving chamber for a subject to enter and exit, a superconducting magnet disposed in the housing for generating a uniform magnetic field, and a gradient coil disposed between the housing and the superconducting magnet.
The existing magnetic resonance scanning equipment does not feel narrow and claustrophobic space when a detected person carries out magnetic resonance scanning, and the accommodating cavity of the shell of the magnetic resonance equipment is made to accommodate the whole body of the detected person.
In addition, because the head, the chest, the upper limbs and the lower limbs of the detected person are not uniform bodies with the same size, when a specific part such as the head is scanned, the accommodating cavity of the shell is large, the head is small, the distance between the center of the head and the gradient coil is large, and thus a magnetic resonance image of the head reconstructed after scanning is not clear, and the diagnosis of the disease condition of the detected person by a doctor is influenced.
SUMMERY OF THE UTILITY MODEL
Based on the above, the gradient coil and the magnetic resonance scanning device for scanning the specific part of the human body to make the magnetic resonance image clear are provided, aiming at the problem that the magnetic resonance image is unclear due to the fact that the specific part is far away from the superconducting magnet when the specific part of the human body is scanned by the existing magnetic resonance scanning device.
A gradient coil, comprising:
the main coil group is cylindrical; and
the shielding coil group is sleeved outside the main coil group in a cylindrical shape;
the main coil group is provided with an annular limiting part protruding towards one side far away from the shielding coil group along the circumferential direction.
In one embodiment, the longitudinal section of the annular limiting part is trapezoidal or rectangular.
In one embodiment, the annular limiting part has a symmetry plane perpendicular to the axial direction of the main coil group.
In one embodiment, the gradient coil further comprises a cooling structure disposed between the main coil set and the shield coil set.
A magnetic resonance scanning apparatus comprising the gradient coil described above.
In one embodiment, an inner region of the annular restraining portion includes an imaging region.
In one embodiment, the magnetic resonance scanning apparatus further comprises a superconducting magnet located on a side of the set of shielding coils remote from the set of main coils.
In one embodiment, the magnetic resonance scanning apparatus further comprises a hollow annular housing, the superconducting magnet and the gradient coil are accommodated in the housing, and an accommodating cavity is formed inside the housing;
the shell comprises a first shell and a second shell connected with the first shell, and the first shell accommodates the superconducting magnet;
the second shell is accommodated in the gradient coil, and the outline shape of the second shell is the same as that of the gradient coil.
In one embodiment, the first housing and the second housing are removably connected.
In one embodiment, two opposite ends of the shell are provided with openings, and the openings are communicated with the accommodating cavity.
According to the gradient coil and the magnetic resonance scanning equipment, the distance between the inner peripheral wall of the annular limiting part of the main coil group of the gradient coil and the shielding coil group is larger, so that enough strength and climbing rate can be achieved in a required imaging area, and the inner diameter of the annular limiting part of the main coil group is smaller, so that the gradient coil is closer to a specific part of a detected person, a clear magnetic resonance image of the specific part of the detected person can be obtained when the specific part of the detected person is subjected to magnetic resonance scanning, and the accuracy of a doctor in the disease diagnosis of the detected person is improved. In addition, the arrangement of the shielding coil can realize the active shielding function of the gradient coil, reduce the eddy current and further improve the imaging quality. The gradient coil of the utility model can meet the requirement of magnetic resonance.
Drawings
Fig. 1 is a schematic structural diagram of a gradient coil according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a magnetic resonance scanning apparatus according to an embodiment of the present invention;
figure 3 is a cross-sectional schematic view of the magnetic resonance scanning apparatus shown in figure 1.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
When an element is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present, unless otherwise specified. It will also be understood that when an element is referred to as being "between" two elements, it can be the only one between the two elements, or one or more intervening elements may also be present.
Where the terms "comprising," "having," and "including" are used herein, another element may be added unless an explicit limitation is used, such as "only," "consisting of … …," etc. Unless mentioned to the contrary, terms in the singular may include the plural and are not to be construed as being one in number.
It will also be understood that when interpreting elements, although not explicitly described, the elements are to be interpreted as including a range of errors which are within the acceptable range of deviation of the particular values as determined by those skilled in the art. For example, "about," "approximately," or "substantially" may mean within one or more standard deviations, without limitation.
Furthermore, the drawings are not 1: 1, and the relative dimensions of the various elements in the figures are drawn for illustration only and not necessarily to true scale.
Fig. 1 shows a schematic structural diagram of a gradient coil in an embodiment of the present invention. For the purpose of illustration, the drawings show only the structures associated with embodiments of the invention.
Referring to the drawings, a gradient coil 100 according to an embodiment of the present invention includes a main coil assembly 10 and a shield coil assembly 20.
The main coil group 10 is cylindrical, and the shielding coil group 20 is sleeved outside the main coil group 10 in a cylindrical manner, wherein the main coil group 10 has an annular limiting portion 11 protruding beyond one side of the shielding coil group 20 along the circumferential direction.
In the embodiment of the present invention, the main coil group 10 includes a main X coil, a main Y coil, and a main Z coil. By controlling the relative contributions of the main X-coil, the main Y-coil and the main Z-coil, the strength of the linearly varying magnetic field can be adjusted.
The shielding coil assembly 20 is provided as a plurality of turns of conductive material that transmit current in opposite directions of the main coil assembly 10. The shield coil group 20 includes a shield X coil, a shield Y coil, and a shield Z coil, similar to the structure of the main coil group 10. In this way, the shield coil group 20 can generate a magnetic field opposite to the magnetic field substrate generated by the main coil group 10 to the region outside the shield coil group 20. The design of the shield coil assembly 20 may reduce stray fields in the main coil assembly 20 that may cause eddy currents (eddy currents) in other conductive mechanisms, such as a cryostat.
It should be understood that the inner region of the annular limiting portion 11 includes an imaging region, and a specific part of the subject can be located in the imaging region for scanning imaging.
It should also be understood that only a portion of the longitudinal cross-section of the main coil assembly 10 in the gradient coil 100 may be convex in shape to accommodate a particular portion of the human body.
Thus, the distance between the inner peripheral wall of the annular limiting part 11 of the main coil group 10 and the shielding coil group 20 is large, sufficient strength and climbing rate can be achieved in a required imaging area, and the inner diameter of the annular limiting part 11 of the main coil group 10 is smaller, so that the gradient coil 100 is closer to a specific part of a detected person, and when the specific part of the detected person is subjected to magnetic resonance scanning, a clear magnetic resonance image of the specific part of the detected person can be obtained, and the accuracy of the doctor for diagnosing the illness state of the detected person is improved. In addition, the arrangement of the shielding coil 20 can realize the active shielding function of the gradient coil 100, reduce the eddy current and further improve the imaging quality. The gradient coil 100 of the present invention can satisfy the 7T magnetic resonance requirement.
Another conventional magnetic resonance scanning apparatus wears an additional head receiving coil on the head of the subject to receive the head magnetic resonance signal, so as to obtain a complete head magnetic resonance signal during the head magnetic resonance scanning, thereby obtaining a clear head magnetic resonance image. The head receiving coil needs to cover the head of the detected person, so that the patient can be very oppressed during scanning, the comfort of the detected person during medical examination is reduced, and the operation difficulty of a doctor is increased. In addition, the additional head receive coils also increase the cost of the magnetic resonance scanning apparatus. And the utility model discloses a gradient coil 100 provides the detection space of specific part including the human brain, has improved magnetic resonance scanning equipment's comfort level, has reduced magnetic resonance scanning equipment's cost.
In some embodiments, the longitudinal section of the annular stopper portion 11 has a trapezoidal shape or a rectangular shape. It should be understood that the longitudinal section of the annular stopper portion 11 refers to a section of the annular stopper portion 11 in a direction parallel to the axis of the main coil group 10. Therefore, the annular limiting part 11 is ensured to have a certain length along the axial direction, so that the length of the imaging area is ensured, meanwhile, other parts of the detected person can be limited by utilizing the two sides of the annular limiting part 11 along the axial direction, and further, the specific parts can be ensured to fall into the imaging area limited by the annular limiting part 11. For example, when the head of the person to be detected is detected, the two side surfaces of the annular limiting part 11 in the axial direction can limit the shoulder of the person to be detected, so that the head of the person to be detected can accurately fall into the imaging area.
In some embodiments, the annular limiting part 11 has a symmetry plane perpendicular to the axial direction of the main coil group 10. The annular limiting part 11 is symmetrically arranged, so that a detected person can enter the imaging area of the gradient coil 100 from two directions for detection, the detected person is facilitated, and the operation of a doctor is simplified.
In some embodiments, the gradient coil 100 further includes a cooling structure disposed between the main coil set 10 and the shield coil set 20. Specifically, cooling structure is condenser tube, and condenser tube includes that main water pipe and shielding water pipe are combined material condenser tube, provide sufficient heat conductivity for gradient coil 100 heat dissipation, and combined material's use has satisfied gradient coil 100 demand to the heat conduction, has realized gradient coil 100's water and electricity separation completely, can use ordinary pure water or distilled water as the refrigerant, need not use deionized water, has reduced the dependence of end user to special material and has reduced the maintenance cost. In one embodiment, the main water pipe and the shielding water pipe can adopt a plurality of composite material water pipes, a parallel mechanism is used, and the whole coil is only provided with one water inlet and one water outlet, so that the use is convenient for users.
In some embodiments, the main coil groups 10 and the shielding coil groups 20 may employ torsionally optimized main coil groups 10 and torsionally optimized shielding coil groups 20. The torsion-optimized main coil assembly 10 and the torsion-optimized shield coil assembly 20 are torsion-optimized coils that reduce noise and vibration when the gradient coil 100 is applied to a magnetic resonance scanner.
As shown in fig. 2 and 3, based on the same inventive concept, the present invention further provides a magnetic resonance scanning apparatus 200 including the gradient coil 100 described above.
Specifically, the magnetic resonance scanning apparatus 200 further includes a superconducting magnet 210, and the superconducting magnet 210 is located on a side of the shielding coil group away from the main coil group 10.
Further, the magnetic resonance scanning apparatus 200 further includes a hollow annular housing 220, the superconducting magnet 210 and the gradient coil 100 are accommodated in the housing 220, and an accommodating cavity 221 is formed inside the housing 220. The housing 220 includes a first housing 222 and a second housing 223 connected to the first housing 222, the first housing 222 houses the superconducting magnet 210, the second housing 223 houses the gradient coil 100, and an outline shape of the second housing 223 is the same as an outline shape of the gradient coil 100. In this manner, an imaging region can be formed at the inner side of the housing 220 corresponding to the annular stopper portion 11.
It should be understood that the receiving cavity 221 is used for receiving the detected person, and in particular, both ends of the housing 220 are provided with openings, and both openings are communicated with the receiving cavity 221, so as to facilitate the detected person to enter the magnetic resonance scanning apparatus 200 from any one of the openings for detection.
In some embodiments, the first housing 222 and the second housing 223 are removably coupled. The removable connection may facilitate servicing and maintenance of the gradient coil 100.
The embodiment of the utility model provides a gradient coil 100 and magnetic resonance scanning equipment 200 has following beneficial effect:
the distance between the inner peripheral wall of the annular limiting part 11 of the main coil group 10 of the gradient coil 100 and the shielding coil group 20 is large, so that the sufficient strength and climbing rate can be achieved in a required imaging area, and the inner diameter of the annular limiting part 11 of the main coil group 10 is smaller, so that the gradient coil 100 is closer to a specific part of a detected person, and a clear magnetic resonance image of the specific part of the detected person can be obtained when the specific part of the detected person is subjected to magnetic resonance scanning, and the accuracy of doctors in the disease diagnosis of the detected person is improved. In addition, the arrangement of the shielding coil 20 can realize the active shielding function of the gradient coil 100, reduce the eddy current and further improve the imaging quality. The gradient coil 100 of the present invention can satisfy the 7T magnetic resonance requirement.
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 represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. A gradient coil, comprising:
the main coil group is cylindrical; and
the shielding coil group is sleeved outside the main coil group in a cylindrical shape;
the main coil group is provided with an annular limiting part protruding towards one side far away from the shielding coil group along the circumferential direction.
2. The gradient coil according to claim 1, wherein a longitudinal section of the annular stopper portion has a trapezoidal shape or a rectangular shape.
3. The gradient coil of claim 1, wherein the annular position-limiting portion has a plane of symmetry perpendicular to an axial direction of the main coil set.
4. The gradient coil of claim 1, further comprising a cooling structure disposed between the main coil set and the shield coil set.
5. A magnetic resonance scanning apparatus comprising a gradient coil as claimed in any one of claims 1 to 4.
6. The magnetic resonance scanning apparatus of claim 5, wherein an inner region of the annular stop portion includes an imaging region.
7. The magnetic resonance scanning apparatus of claim 5, further comprising a superconducting magnet located on a side of the set of shielding coils remote from the set of main coils.
8. The magnetic resonance scanning apparatus according to claim 7, further comprising a hollow annular housing in which the superconducting magnet and the gradient coil are housed, the housing forming a housing cavity inside;
the shell comprises a first shell and a second shell connected with the first shell, and the first shell accommodates the superconducting magnet;
the second shell is accommodated in the gradient coil, and the outline shape of the second shell is the same as that of the gradient coil.
9. The magnetic resonance scanning device of claim 8, wherein the first housing and the second housing are removably coupled.
10. The apparatus according to claim 8, wherein the housing has openings at opposite ends, both openings communicating with the receiving cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922268830.3U CN211325033U (en) | 2019-12-17 | 2019-12-17 | Gradient coil and magnetic resonance scanning device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922268830.3U CN211325033U (en) | 2019-12-17 | 2019-12-17 | Gradient coil and magnetic resonance scanning device |
Publications (1)
| Publication Number | Publication Date |
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| CN211325033U true CN211325033U (en) | 2020-08-25 |
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| CN201922268830.3U Active CN211325033U (en) | 2019-12-17 | 2019-12-17 | Gradient coil and magnetic resonance scanning device |
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| CN (1) | CN211325033U (en) |
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