CN211698152U - Head-dedicated normally-conductive MRI magnet - Google Patents
Head-dedicated normally-conductive MRI magnet Download PDFInfo
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- CN211698152U CN211698152U CN201921979881.0U CN201921979881U CN211698152U CN 211698152 U CN211698152 U CN 211698152U CN 201921979881 U CN201921979881 U CN 201921979881U CN 211698152 U CN211698152 U CN 211698152U
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Abstract
The utility model discloses a special normal MRI magnet of leading of head belongs to the magnetic resonance field, including upper and lower apron, through the bolt be fixed in respectively about the apron on the upper and lower polar core, through the bolt be fixed in respectively about the polar core on the upper and lower polar head, through the bolt be fixed in respectively about the shimming ring on the polar head, through the bolt be fixed in respectively about the polar head and between the apron about the upper and lower solenoid and connect the cylinder type stand of apron from top to bottom, polar head, polar core and solenoid all adopt oval structure. The utility model discloses an above-mentioned special normal MRI magnet structure of leading of head is less, has reduced the cost and the weight of the special normal MRI magnet of leading of head under the prerequisite of guaranteeing head scanning image quality.
Description
Technical Field
The utility model relates to a magnetic resonance field especially relates to a special normal conduction MRI magnet of head.
Background
The MRI imaging device is the most advanced clinical diagnostic device for finding and diagnosing early cancer and other various diseases, and the MRI imaging device provides a large amount of information without ionizing radiation, has no adverse effect on human body, has the advantages of high resolution, multiple imaging parameters, wide diagnosis range, capability of scanning any section and the like, therefore, the magnetic resonance imaging equipment is regarded by the medical field, the magnet is a main component of the MRI and provides a stable and uniform main magnetic field for the MRI system, the conventional normally-conducting MRI magnet is a whole body examination magnet, when a detected person does not need to carry out whole body scanning and only needs to carry out scanning on certain specific parts, the magnetic resonance scanning equipment has large volume, high cost and higher requirements on installation conditions and environment, and the number of special hospitals is gradually increased, the demand for special magnets will also come to be larger, and the utility model provides a special permanent Magnetic Resonance Imaging (MRI) magnet for heads.
Disclosure of Invention
The utility model aims at providing a special MRI magnet of leading always of head solves current conventional MRI general examination magnet bulky with high costs and to installation condition and environmental requirement higher, is not suitable for the problem of special hospital.
In order to achieve the above object, the utility model provides a special normal conduction MRI magnet of head, including upper and lower apron 1, 9, be fixed in upper and lower utmost point core 3, 7 on upper and lower apron 1, 9 respectively through the bolt, be fixed in upper and lower utmost point head 4, 6 on upper and lower utmost point core 3, 7 respectively through the bolt, be fixed in shimming ring 5 on upper and lower utmost point head 4, 6 respectively through the bolt, be fixed in upper and lower utmost point head 4, 6 respectively through the bolt and lap upper and lower solenoid 2, 8 and connect the cylinder type stand 10 of apron 1, 9 from top to bottom between upper and lower apron 1, 9, apron, utmost point head, utmost point core, solenoid and shimming ring all adopt oval structure.
Preferably, the upper and lower cover plates 1, 9; upper and lower pole pieces 3, 7; the upper and lower pole heads 4, 6 and the shim ring 5 are made of DT4C, and the upper and lower electromagnetic coils 2, 8 are made of T2 red copper.
Preferably, the cover plate, the pole head, the pole core, the electromagnetic coil and the shimming ring are in the same elliptical long axis direction as the height direction of the human body, and in the same elliptical short axis direction as the width direction of the head.
Preferably, two cylindrical columns 10 are respectively connected to the elliptical long axis ends of the upper and lower cover plates 1 and 9.
Preferably, the distance between the upper pole head and the lower pole head 4 and 6 is 400 mm.
Has the advantages that:
(1) the cover plate, the pole heads, the pole cores, the electromagnetic coils and the shimming rings are all in an elliptical structure, and according to the shape of the head of a human body, the air gap sectional area of the magnet is reduced, so that the magnetic conduction sectional area of the cylindrical stand column 10 is reduced, and the size and the weight of the cylindrical stand column 10 are reduced.
(2) The utility model provides a special MRI magnet of leading always of head compact structure can further reduce the cost under the prerequisite of the image quality that guarantees the head scanning and obtain.
The technical solution of the present invention is further described in detail by the accompanying drawings and examples.
Drawings
Fig. 1 is a front view of the head-dedicated normally conductive MRI magnet of the present invention.
Fig. 2 is a sectional view of the head-dedicated normally conductive MRI magnet of the present invention.
Wherein: 1-upper cover plate; 2-upper electromagnetic coil; 3-upper pole core; 4-upper pole head; 5-shimming rings; 6-lower pole head; 7-lower pole core; 8-lower electromagnetic coil; 9-lower cover plate; 10-cylindrical column.
Detailed Description
The following describes embodiments of the present invention with reference to the accompanying drawings.
Fig. 1 is a front view of the MRI magnet with normal conduction specially used for head, and fig. 2 is a cross-sectional view of the MRI magnet with normal conduction specially used for head. As shown in the figure, a head-dedicated normally-conductive MRI magnet comprises upper and lower cover plates 1, 9; upper and lower pole pieces 3, 7 fixed to the upper and lower cover plates 1, 9 respectively by bolts; upper and lower pole heads 4, 6 fixed to the upper and lower pole cores 3, 7 respectively by bolts; shimming rings 5 fixed on the upper and lower pole heads 4 and 6 respectively through bolts; the upper and lower electromagnetic coils 2 and 8 are respectively fixed between the upper and lower pole heads 4 and 6 and the upper and lower cover plates 1 and 9 through bolts, and the cylindrical upright post 10 is connected with the upper and lower cover plates 1 and 9, and the cover plates, the pole heads, the pole cores, the electromagnetic coils and the shimming rings all adopt elliptical structures.
The upper and lower cover plates 1, 9; upper and lower pole pieces 3, 7; the upper and lower pole heads 4, 6 and the shimming ring 5 are made of DT4C, the upper and lower electromagnetic coils 2, 8 are made of T2 red copper, the elliptical long axis direction of the cover plate, the pole heads, the pole cores, the electromagnetic coils and the shimming ring is consistent with the height direction of a human body, and the elliptical short axis direction is consistent with the width direction of the head.
According to a first principle formula of the magnetic circuit:
in the formulaK f As a coefficient of the magnetic flux leakage,B g is the magnetic field strength of the air gap,S g is the cross section of the air gap magnetic conduction,B n the maximum magnetic saturation intensity of the upright post,S n the sectional area of the stand column, the magnetic field intensity of the air gap and the magnetic conduction material of the stand column are determined, the magnetic conduction sectional area of the air gap is reduced, the magnetic conduction sectional area of the stand column can be reduced, and the volume and the weight of the stand column are reduced.
The magnetic field intensity of the special normally-conductive MRI magnet for the head is 1600 gauss, the distance between the upper pole head and the lower pole head 4 and 6 is 400mm, the space is large, the use comfort of a detected person is improved, the magnetic field uniformity is 300mm of a long axis and 150mm of a short axis, and the stability is 8 hours and is smaller than 20 ppm.
The utility model provides a special MRI magnet of leading always of head compact structure can reduce magnet weight and volume under the prerequisite of the image quality who guarantees the head scanning and obtain, and then reduce cost is applicable to the application promotion of special hospital.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, but not to limit it, although the technical solution of the present invention is described in detail with reference to the preferred embodiments, the skilled person of the present invention should understand that: the technical solution of the present invention can still be modified or replaced by other equivalent means, and the modified technical solution can not be separated from the spirit and scope of the technical solution of the present invention.
Claims (5)
1. The special normally-conducting MRI magnet for the head comprises an upper cover plate, a lower cover plate, an upper pole core, a lower pole core, an upper pole head, a lower pole head, a shimming ring, an upper electromagnetic coil, a lower electromagnetic coil and a cylindrical stand column, wherein the upper pole core and the lower pole core are fixed on the upper cover plate and the lower cover plate respectively through bolts, the upper pole head and the lower pole head are fixed on the upper pole core and the lower pole head respectively through bolts, the upper electromagnetic coil and the lower electromagnetic coil are: the cover plate, the pole head, the pole core, the electromagnetic coil and the shimming ring are all designed into an oval structure according to the shape of the head of a human body.
2. The head-specific normally-on MRI magnet of claim 1, wherein: the upper cover plate, the lower cover plate, the upper pole core, the lower pole core, the upper pole head, the lower pole head and the shimming ring are all made of DT4C, and the electromagnetic coil is made of T2 red copper.
3. The head-specific normally-on MRI magnet of claim 1, wherein: the cover plate, the pole head, the pole core, the electromagnetic coil and the shimming ring are in the same elliptical long axis direction as the height direction of a human body, and in the same elliptical short axis direction as the width direction of the head.
4. The head-specific normally-on MRI magnet of claim 1, wherein: the cylindrical upright posts are two and are respectively connected to the elliptical long axis ends of the upper cover plate and the lower cover plate.
5. The head-specific normally-on MRI magnet of claim 1, wherein: the distance between the upper pole head and the lower pole head is 400 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921979881.0U CN211698152U (en) | 2019-11-16 | 2019-11-16 | Head-dedicated normally-conductive MRI magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921979881.0U CN211698152U (en) | 2019-11-16 | 2019-11-16 | Head-dedicated normally-conductive MRI magnet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211698152U true CN211698152U (en) | 2020-10-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921979881.0U Active CN211698152U (en) | 2019-11-16 | 2019-11-16 | Head-dedicated normally-conductive MRI magnet |
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| Country | Link |
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| CN (1) | CN211698152U (en) |
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2019
- 2019-11-16 CN CN201921979881.0U patent/CN211698152U/en active Active
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