CN209946363U - Gradient coil and magnetic resonance imaging device - Google Patents
Gradient coil and magnetic resonance imaging device Download PDFInfo
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- CN209946363U CN209946363U CN201821115594.0U CN201821115594U CN209946363U CN 209946363 U CN209946363 U CN 209946363U CN 201821115594 U CN201821115594 U CN 201821115594U CN 209946363 U CN209946363 U CN 209946363U
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- shim
- gradient coil
- shimming
- annular end
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Abstract
The utility model provides a gradient coil and magnetic resonance imaging device, it is including the cylindric main part of cavity that has annular opening terminal surface, and it includes: the first shimming holes are used for inserting first shimming strips, are arranged on the annular end face along the circumferential direction of the annular end face and extend along the axial direction of the main body; the second shimming holes are used for inserting second shimming strips, are arranged on the annular end face along the circumferential direction of the annular end face and extend along the axial direction of the main body; the first shimming hole and the second shimming hole are respectively arranged in a ring shape in the circumferential direction of the annular end face and are arranged at different positions in the radial direction of the annular end face in a separated mode.
Description
Technical Field
The utility model relates to a magnetic resonance imaging device's gradient coil and have above-mentioned gradient coil's magnetic resonance imaging device.
Background
In order to improve the quality of magnetic resonance imaging, the magnetic field uniformity of the magnetic resonance imaging device needs to be adjusted. The gradient coil of the existing magnetic resonance imaging device is provided with a plurality of shimming strips, each shimming strip is provided with a unit grid capable of placing the shimming strip, the magnetic field uniformity of the magnetic resonance imaging device can be adjusted by adjusting the number of the shimming strips carried by each shimming strip, and the process is called as a passive shimming process.
In the passive shimming process, because the shimming sheets have higher magnetic conductivity, when the shimming strips bearing a large number of shimming sheets are operated, in order to ensure safe operation and protect the shimming strips from being damaged under strong magnetic field force, the magnetic resonance imaging device needs to be lowered firstly, and then the magnetic resonance imaging device is raised after the shimming strips are adjusted, and the magnetic field uniformity can be adjusted by repeating the steps for many times. A large amount of liquid helium is consumed in each field descending and field ascending operation, and labor cost is wasted.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a gradient coil that is light in weight and can shim without requiring a field lifting operation, and a magnetic resonance imaging apparatus including the same.
An embodiment of the utility model provides a gradient coil, it includes the cylindric main part of cavity that has annular opening terminal surface, and it includes: the first shimming holes are used for inserting first shimming strips, are arranged on the annular end face along the circumferential direction of the annular end face and extend along the axial direction of the main body; the second shimming holes are used for inserting second shimming strips, are arranged on the annular end face along the circumferential direction of the annular end face and extend along the axial direction of the main body; the first shimming hole and the second shimming hole are respectively arranged in a ring shape in the circumferential direction of the annular end face and are arranged at different positions in the radial direction of the annular end face in a separated mode.
According to the above embodiment, by providing the first shim holes and the second shim holes at different positions in the radial direction of the gradient coil, the first and second shim bars can be directly assembled and shimmed at the user site of the magnetic resonance apparatus. Shimming may be performed by the first shim bars inserted into the first shim holes in a field where the magnetic resonance apparatus is manufactured, and when the magnetic resonance apparatus is manufactured and transported to a user location, shimming may be performed by the second shim bars inserted into the second shim holes.
In the gradient coil, it is preferable that the first shim hole and the second shim hole are arranged at the same circumferential position on the annular end surface so as to be opposed to each other in a radial direction of the annular end surface.
In the gradient coil, the first shim holes and the second shim holes are preferably connected by through holes.
In the gradient coil, the first shim holes and the second shim holes are preferably arranged alternately in a zigzag shape in the circumferential direction on the annular end surface.
In addition, the first shimming holes and the second shimming holes are arranged in a ring shape in the circumferential direction of the annular end face, and the number of the shimming holes can be 8-36
In addition, the sections of the first shim hole and the second shim hole in the direction perpendicular to the axial direction of the gradient coil can be the same or different.
Furthermore, the first shim holes may be variable in cross section in the axial direction of the gradient coil, and the second shim holes may be variable in cross section in the axial direction of the gradient coil.
In the gradient coil, it is preferable that the first shim bar or the second shim bar be attached to one of the first shim hole and the second shim hole, and a noise reduction member be attached to the other shim hole.
In the gradient coil, it is preferable that a noise reduction member is provided in the through hole.
In the gradient coil, it is preferable that shim bars be attached to only one of the first shim hole and the second shim hole, and the other shim hole be left empty.
In the gradient coil, it is preferable that a support projection surrounding the gradient coil is further provided radially outside the opening of the gradient coil.
In the gradient coil, the first shim bars are preferably different from the second shim bars.
Further, in the gradient coil described above, it is preferable that the gradient coil includes a main gradient coil and a shield gradient coil, the shield gradient coil is disposed radially outside the main gradient coil, and the first shim bar and the second shim bar are disposed between the main gradient coil and the shield gradient coil.
Another embodiment of the present invention provides a magnetic resonance imaging apparatus, which includes: a superconducting magnet; and one of the gradient coils described above.
According to the utility model discloses can obtain a light in weight and need not lift field operation just can carry out the gradient coil of shimming and possess its magnetic resonance imaging device.
Drawings
The above and other features and advantages of the present invention will become more apparent to those of ordinary skill in the art by describing in detail preferred embodiments thereof with reference to the attached drawings, in which:
fig. 1A is a perspective view showing a gradient coil according to a first embodiment of the present invention.
FIG. 1B is a side view in the axial direction showing the gradient coil.
FIG. 2A is a side view illustrating insertion of shim bars in shim holes of a gradient coil.
Fig. 2B is a sectional view showing a section along the line a-a of fig. 2A.
Fig. 3 is a side view showing an annular end face of a gradient coil according to a second embodiment.
Fig. 4A shows a side view of an annular end face of a gradient coil according to a third embodiment of the present invention.
Fig. 4B shows a perspective view of the gradient coil of the above-described embodiment.
Wherein the reference numbers are as follows:
10. a gradient coil;
11. a main body;
12. 13, 14 shimming holes;
121 a first shim hole;
122 second shim holes;
123 through holes;
an S-shaped annular end face;
p positioning projection
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention is further described in detail by referring to the following embodiments.
"exemplary" means "serving as an example, instance, or illustration" herein, and any illustration, embodiment, or steps described as "exemplary" herein should not be construed as a preferred or advantageous alternative.
For the sake of simplicity, only the parts relevant to the present invention are schematically shown in the drawings, and they do not represent the actual structure as a product. In addition, for simplicity and clarity of understanding, only one of the components having the same structure or function is schematically illustrated or labeled in some of the drawings.
First embodiment
Fig. 1A shows a perspective view of a gradient coil 10 according to a first embodiment of the present invention. As shown in fig. 1A, the gradient coil 10 of the present embodiment includes a hollow cylindrical body 11. A plurality of shim holes 12 for mounting shim strips are provided in the annular open end surface S of the main body 11. The shim holes 12 are provided along the circumferential direction of the annular end surface S and extend from one end to the other end of the gradient coil in the axial direction (longitudinal direction) of the main body 11.
Fig. 1B shows a side view of the gradient coil 10 in the axial direction. As shown in fig. 1B, 20 shim holes 12 are provided in the open end surface S of the gradient coil 10 at equal intervals in the circumferential direction (indicated by arrow C) of the annular end surface S. In this side view, the shim holes 12 have H-shaped openings at the annular end faces, specifically, the shim holes 12 include an elongated first shim hole 121 for inserting a first shim bar in the axial direction of the main body 11 and an elongated second shim hole 122 for inserting a second shim bar in the axial direction of the main body 11, and the first shim hole 121 and the second shim hole 122 are separately provided at different positions in the radial direction (indicated by arrow R) of the gradient coil, that is, the first shim hole 121 and the second shim hole 122 are provided at different radial positions of the annular end faces. Further, in the present embodiment, the openings of the first shim holes 121 and the second shim holes 122 at the annular end faces have the same width W1-W2 in the circumferential direction of the main body 11, and the first shim holes 121 and the second shim holes 122 are arranged opposite to each other in a one-to-one correspondence in the radial direction of the gradient coil and are provided at the same position in the circumferential direction of the annular end faces. Further, a through hole 123 is provided between the first shim hole 121 and the second shim hole 122, the through hole 123 connects the first shim hole 121 and the second shim hole 122, and the width W3 of the through hole 123 in the circumferential direction of the annular end surface S is smaller than the width W1(W2) of the first shim hole 121 (or the second shim hole 122) in the circumferential direction of the annular end surface, whereby one positioning protrusion P is formed between the first shim hole 121 and the second shim hole 122 of the shim hole 12.
Fig. 2A shows a side view with shim strips inserted in the shim holes 12 of the gradient coil 10. As shown in fig. 2A, the first shim bars 21 are inserted into the first shim holes 121, and the first shim bars 21 are supported by the positioning protrusions P. Furthermore, second shim strips 22 are inserted into the second shim holes 122. Fig. 2B shows a cross-sectional view taken along line a-a of fig. 2A. As shown in fig. 2B, the gradient coil 10 includes a main gradient coil 101 and a shield gradient coil 102 located radially outward of the main gradient coil 101, and first and second shim holes 121 and 122 are provided in a space between the main gradient coil 101 and the shield gradient coil 102. In the present embodiment, the first shim bars 21 are longer in length than the second shim bars 22. The first shim 21 and the second shim 22 have cells (not shown) on which shims can be mounted. In the present exemplary embodiment, the first shim strips 21 and the second shim strips 22 have the same width in the circumferential direction of the annular end face, but may also differ. Alternatively, the first shim bars 21 and the second shim bars 22 may have different colors, as long as the first shim bars and the second shim bars can be distinguished. In general, the shimming can be carried out within the field in which the magnetic resonance apparatus is manufactured, using the first shim strips 21 inserted into the first shim holes 121. When the magnetic resonance apparatus is transported to the user's site, the shimming can be further performed by the second shim bars 22 inserted into the second shim holes 122, and in this case, the shimming operation can be performed directly in the presence of a magnetic field without performing the field raising and lowering operation on the magnetic resonance apparatus, thereby reducing the consumption of liquid helium.
Second embodiment
Fig. 3 shows a side view on the annular end face S of the gradient coil according to the second exemplary embodiment. As shown in fig. 3, in the present embodiment, the shim holes 13 have substantially T-shaped openings at the annular end surface S, including the first shim holes 131 and the through holes 132. In contrast to the first exemplary embodiment, the first shim hole 121 and the second shim hole 122 in the first exemplary embodiment are combined into one shim hole 131, i.e., the first shim strip 21 and the second shim strip 22 are arranged in the shim hole 131. Further, the width of the through hole 132 in the circumferential direction of the annular end face is smaller than the width of the shim hole 131 in the circumferential direction of the annular end face, whereby one positioning protrusion P is formed between the first shim hole 131 and the through hole 132. When the first shim bar 21 and the second shim bar 22 are disposed in the first shim hole 131, the first shim bar 21 and the second shim bar 22 are supported by the positioning convex portions P. The configuration other than this is the same as that of the first embodiment.
Third embodiment
Fig. 4A shows a side view on the annular end surface S of a gradient coil according to a third embodiment of the present invention. Fig. 4B shows a perspective view of the gradient coil of the above-described embodiment. As shown in fig. 4A and 4B, unlike the first embodiment, the shim holes 14 include first shim holes 141 and second shim holes 142, the first shim holes 141 are provided at positions different from the second shim holes 142 in the radial direction (arrow R direction) of the annular end surface of the gradient coil, the first shim holes 141 and the second shim holes 142 are alternately arranged in a zigzag shape in the circumferential direction (arrow C direction) of the annular end surface of the gradient coil, and no through hole is provided between the first shim holes 141 and the second shim holes 142. Further, in the present embodiment, the width W4 of the first shim hole 141 in the circumferential direction of the annular end face of the gradient coil is larger than the width W5 of the second shim hole 142, and the height of the first shim hole 141 in the radial direction of the annular end face of the gradient coil is higher than the height of the second shim hole 142. Furthermore, as shown in fig. 4B, in the present embodiment, a support flange 15 surrounding the gradient coil is further provided radially outside the opening of the gradient coil.
Other embodiments
In the above-described embodiment, the first shim bar and the second shim bar are provided in the first shim hole and the second shim hole, respectively, but the present invention is not limited thereto, and the shim bar may be attached to one of the first shim hole and the second shim hole, and the noise reduction member may be attached to the other shim hole. Therefore, the influence of noise generated during imaging of the magnetic resonance imaging system on the detected person can be reduced.
Of course, it is also possible to install only the first shim strips in the first shim holes, while leaving the second shim holes free.
In the above-described embodiment, the first shim holes and the second shim holes arranged at different radial positions on the end faces of the gradient coil have been exemplified, but the present invention is not limited thereto, and the third shim holes may be further provided at different radial positions on the end faces of the gradient coil.
In the above-described embodiment, the number of the first shim holes and the number of the second shim holes are 20, but the number is not limited to 8 to 36.
In addition, the sections of the first shim hole and the second shim hole in the direction perpendicular to the axial direction of the gradient coil can be the same or different.
Furthermore, the first shim holes may be variable in cross section in the axial direction of the gradient coil, and the second shim holes may be variable in cross section in the axial direction of the gradient coil.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A gradient coil comprising a hollow cylindrical body having an annular end face, comprising:
the first shimming holes are used for inserting first shimming strips, are arranged on the annular end face along the circumferential direction of the annular end face and extend along the axial direction of the main body;
the second shimming holes are used for inserting second shimming strips, are arranged on the annular end face along the circumferential direction of the annular end face and extend along the axial direction of the main body;
the first shimming hole and the second shimming hole are respectively arranged in a ring shape in the circumferential direction of the annular end face and are arranged at different positions in the radial direction of the annular end face in a separated manner,
the first shim hole and the second shim hole are arranged at the same circumferential position of the annular end surface in a manner of being opposite to each other in the radial direction of the annular end surface,
the first shimming hole is connected with the second shimming hole through a through hole.
2. Gradient coil according to claim 1,
a noise reduction member is disposed in the through hole.
3. A gradient coil comprising a hollow cylindrical body having an annular end face, comprising:
the first shimming holes are used for inserting first shimming strips, are arranged on the annular end face along the circumferential direction of the annular end face and extend along the axial direction of the main body;
the second shimming holes are used for inserting second shimming strips, are arranged on the annular end face along the circumferential direction of the annular end face and extend along the axial direction of the main body;
the first shimming hole and the second shimming hole are respectively arranged in a ring shape in the circumferential direction of the annular end face and are arranged at different positions in the radial direction of the annular end face in a separated manner,
the first shim holes and the second shim holes are alternately arranged in a zigzag shape in the circumferential direction on the annular end face.
4. Gradient coil according to claim 1 or 3,
the first shim bar or the second shim bar is arranged in one of the first shim hole and the second shim hole, and the noise reduction component is arranged in the other shim hole.
5. Gradient coil according to claim 1 or 3,
only one of the first shimming hole or the second shimming hole is provided with shimming strips, and the other shimming hole is kept empty.
6. Gradient coil according to claim 1 or 3,
a supporting projection surrounding the gradient coil is also arranged on the radial outer side of the opening of the gradient coil.
7. Gradient coil according to claim 1 or 3,
the first shim bar is different from the second shim bar.
8. Gradient coil according to claim 1 or 3,
comprises a main gradient coil and a shielding gradient coil, wherein the shielding gradient coil is arranged at the radial outer side of the main gradient coil,
the first shim bar and the second shim bar are arranged between the main gradient coil and the shielding gradient coil.
9. Magnetic resonance imaging apparatus, characterized in that it comprises:
a superconducting magnet; and
a gradient coil as claimed in any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821115594.0U CN209946363U (en) | 2018-07-12 | 2018-07-12 | Gradient coil and magnetic resonance imaging device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821115594.0U CN209946363U (en) | 2018-07-12 | 2018-07-12 | Gradient coil and magnetic resonance imaging device |
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| CN209946363U true CN209946363U (en) | 2020-01-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114114114A (en) * | 2020-09-01 | 2022-03-01 | 西门子(深圳)磁共振有限公司 | Shimming assembly for gradient coil and magnetic resonance imaging device |
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2018
- 2018-07-12 CN CN201821115594.0U patent/CN209946363U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114114114A (en) * | 2020-09-01 | 2022-03-01 | 西门子(深圳)磁共振有限公司 | Shimming assembly for gradient coil and magnetic resonance imaging device |
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