CN201387479Y - Gradient coil - Google Patents
Gradient coil Download PDFInfo
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- CN201387479Y CN201387479Y CN200920145229U CN200920145229U CN201387479Y CN 201387479 Y CN201387479 Y CN 201387479Y CN 200920145229 U CN200920145229 U CN 200920145229U CN 200920145229 U CN200920145229 U CN 200920145229U CN 201387479 Y CN201387479 Y CN 201387479Y
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- coil
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- gradient coil
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Abstract
The utility model relates to a gradient coil. The gradient coil is arranged in magnet bodies (51, 52 and 53) respectively, the gradient coil comprises a main coil (1) and a secondary coil (2), a clearance is formed between the main coil (1) and the secondary coil (2), and a passive shimming element (3) is distributed in the interior of the gradient coil. Through the integration of the passive shimming element (3) in the interior of the gradient coil, the utility model effectively utilizes spaces among the gradient coils without increasing the sizes of the magnet bodies, thereby saving the cost of the magnet bodies.
Description
Technical field
The utility model relates to a kind of gradient coil, especially a kind of flat gradient coil that is integrated with passive shimming spare.
Background technology
In magnetic resonance equipment, the magnetic field degree of uniformity directly influences the quality of its imaging.In scanning area, the shimming district is big more, and picture quality is good more.But in the prior art, in order to obtain bigger shimming district, the size of magnetic resonance equipment, complicacy and weight sharply increase, thereby make its cost also sharply increase.Simultaneously, for above-mentioned reasons, the increase of the size of magnetic resonance equipment also makes its openness reduce, thereby limits its application.For open dull and stereotyped magnet, as C type magnet, those who are investigated lie in scanning bed on, be in up and down between two magnetic poles, in order to reduce those who are investigated's claustrophobia effect, open spacing should design greatly as far as possible.
Has good homogeneity although in design, always make every effort to magnet, but the magnetic field homogeneity of produced magnet is common and good unlike expection, and, the vortex flow that the time-varying field that is produced by gradient coil is responded in conductive material, make that the main field homogeneity is destroyed, gradient increases switching time, and image quality is had negative effect.At present, the self-shileding gradient coil is the effective ways that solve eddy current, but its gradient intensity in imaging region also can reduce to some extent than non-shielded gradient coil.In order in imaging region, to obtain high gradient intensity, can enlarge the distance of gradient primary and secondary coil or increase method such as gradient coil external diameter, magnet size increases, weight increases the weight of, thereby the cost of magnet is significantly risen but this causes again.
In order to revise the spatial non-uniformity in magnetic field, final uniformity of magnetic field needs to realize by shimming, for example pastes soft magnetism or Hard Magnetic shimming sheet on magnetic pole.For flat magnet, usually design is on the position for magnetic pole symmetry up and down in the shimming district, and for the hollow cylinder magnet, the shimming district then designs on the position for the cylinder axis symmetry.
For example, U.S. Pat 5,550 discloses a kind of closed gradient coil that is integrated with shimming among the 472A, and wherein, shimming is arranged in the inboard of gradient coil, thereby has occupied the inner space of magnet, makes the inspection space that is used for those who are investigated diminish.
U.S. Pat 5,677 also discloses a kind of open gradient coil that is integrated with shimming among the 630A, wherein, between the inspection space that shimming is arranged in lower magnetic pole equally and is surrounded, reduced the spacing between the dull and stereotyped magnet equally.
Thereby, in order to obtain same big shimming district, will enlarge the size of magnetic resonance equipment, for example, for closed magnet, need to enlarge the diameter of magnet, for flat magnet, need to enlarge the distance that goes up between the lower magnetic pole, these can bring the rapid increase of cost.
Transmitting coil in traditional Permanent Magnet Open Magnetic Resonance system, gradient coil and passive shimming spare all are independent structures, and be to obtain high gradient performance, the relative distance that must be maintained fixed of gradient primary and secondary coil, these make that all its space availability ratio is low, though reduced the influence of eddy current, also caused bigger magnet size, thereby increased the cost of magnet.
The utility model content
Therefore, the technical problems to be solved in the utility model provides a kind of gradient coil that is integrated with passive shimming spare, and it has effectively utilized the space between the gradient coil, and need not to enlarge the size of magnet, has saved the cost of magnet.
For solving above-mentioned technical matters of the present utility model, the utility model proposes a kind of flat gradient coil that is integrated with passive shimming spare, described gradient coil is arranged in the magnet, described gradient coil comprises a main coil and one coil, has a gap between described main coil and described coil, wherein, be furnished with a passive shimming spare at described gradient line.
In one embodiment, described passive shimming spare is arranged in the described gap between described main coil and described the coil.
Wherein, described main coil, described coil and described passive shimming spare are fixed on the described magnet by a fixture respectively, make the relative distance that described main coil, described coil and described passive shimming spare are maintained fixed each other.Be furnished with cooling line respectively in described main coil and described coil.
In the embodiment, described passive shimming spare is arranged in described main coil or described coil inside in another.
Wherein, described main coil and described coil by a fixture, are fixed on the described magnet respectively, make the relative distance that described main coil and described coil are maintained fixed each other.
Wherein, be furnished with cooling line respectively in described main coil and described coil, described cooling line is a helical structure, and described passive shimming spare is arranged between the described cooling line.
The utility model is integrated in passive shimming spare in the gradient coil, has effectively utilized the space between the gradient coil, and need not to enlarge the size of magnet, has saved the cost of magnet.And the cooling line that the utility model can also make full use of main coil and/or inferior coil cools off passive shimming spare, thereby has effectively controlled the temperature of passive shimming spare part.
Description of drawings
The following drawings only is intended to the utility model done and schematically illustrates and explain, does not limit scope of the present utility model.Wherein:
Fig. 1 shows is sectional view according to the gradient coil that is integrated with passive shimming spare of a preferred embodiment of the present utility model;
What Fig. 2 showed is the partial enlarged drawing of the gradient coil shown in Fig. 1;
Fig. 3 shows is sectional view according to the gradient coil that is integrated with passive shimming spare of another embodiment of the present utility model;
What Fig. 4 showed is the partial enlarged drawing of the gradient coil shown in Fig. 3;
Fig. 5 shows is the distribution plan of cooling line and passive shimming spare in the gradient coil shown in Fig. 2;
Fig. 6 shows is along the cut-open view of A-A direction among Fig. 5.
Embodiment
Understand for technical characterictic of the present utility model, purpose and effect being had more clearly, now contrast description of drawings embodiment of the present utility model.Wherein, identical parts adopt identical label.
Embodiment 1
Below with reference to Fig. 1 and Fig. 2 embodiment 1 of the present utility model is elaborated.
What wherein, Fig. 1 showed is according to a kind of sectional view that is integrated with the gradient coil of passive shimming spare of the present utility model; What Fig. 2 showed is the partial enlarged drawing of the gradient coil shown in Fig. 1.Should be noted that, in order to represent conveniently, Fig. 1 and Fig. 2 do not draw according to normal proportionate relationship, for example, the width of gradient coil is much bigger in fact relatively for the thickness of gradient coil, but among Fig. 1,2 thickness of gradient coil is specially amplified for convenience of description.
As shown in Figure 1, the gradient coil in the present embodiment is flat gradient coil, and this flat gradient coil is used for open dull and stereotyped magnet, and for example C type magnet only is the top of dull and stereotyped magnet shown in the figure.Only comprise shown in the figure constituting critical piece of the present utility model, other known configurations of dull and stereotyped magnet is all omitted.
As illustrated in fig. 1 and 2, this flat gradient coil is seen circular substantially structure from top to bottom, it has a centre symmetry line R, described gradient coil is arranged in the magnet, described gradient coil comprises a main coil 1 and one coil 2, have a gap S between described main coil 1 and described coil 2, in the described gap S between described main coil 1 and described coil 2, be furnished with a passive shimming spare 3.
Transmitting coil, gradient coil and passive shimming spare all are independent structures in traditional Permanent Magnet Open Magnetic Resonance system, and are to obtain high gradient performance, the relative distance that must be maintained fixed of gradient primary and secondary coil.In aforementioned prior art, passive shimming spare is arranged between the inspection space that lower magnetic pole surrounds, and has reduced the spacing between the dull and stereotyped magnet.And in the present embodiment, because the distance between main coil 1 and the inferior coil 2 existed already, therefore, passive shimming spare 3 is arranged among the gap S between above-mentioned main coil 1 and the inferior coil 2, form gradient, the incorporate self-shileding gradient coil of passive shimming spare, and can not occupy the inspection space.Thereby this version of present embodiment has effectively been utilized the space between the gradient coil, and need not to enlarge the size of magnet, has saved the cost of magnet.
Referring to Fig. 1, also be furnished with cooling line 4 respectively in described main coil 1 and described coil 2.
Referring to Fig. 2, in order to guarantee the fixed distance between main coil 1, inferior coil 2 and the passive shimming spare 3, described main coil 1, described coil 2 and described passive shimming spare 3 are fixed on the magnet unit 51,52,53 of magnet by fixture 61,62,63 respectively, make the relative distance that described main coil 1, described coil 2 and described passive shimming spare 3 are maintained fixed each other.
As shown in Figure 2, described magnet is to be combined by a plurality of independent magnet unit 51,52,53 to constitute, shown in the figure three independent magnet unit, these three stepped arrangements of independent magnet unit, main coil 1, inferior coil 2 and passive shimming spare 3 are fixed on three cascaded surfaces of described three magnet unit 51,52,53 by fixture (as bolt) 61,62,63 respectively.
Because passive shimming spare part is to temperature sensitivity very, this version of the present utility model, 4 pairs of passive shimming spares 3 of cooling line that can also make full use of main coil 1 and time coil 2 cool off, thereby the temperature of passive shimming spare part 3 has been carried out effective control.
This version that present embodiment adopted need not to change the size of magnet, compares to traditional design, has effectively utilized the space, has reduced the magnet cost.
Below, describe with reference to Fig. 3-6 couple of another embodiment of the present utility model.
Gradient coil is similar shown in Fig. 3 and Fig. 4 and the embodiment 1, and its proportionate relationship is also through specially having amplified.
As shown in Figure 3, this flat gradient coil is seen rounded substantially from top to bottom, it has a centre symmetry line R, described gradient coil is arranged in the magnet, described gradient coil comprises a main coil 1 and one coil 2, has a gap S between described main coil 1 and described coil 2.In the present embodiment, passive shimming spare 3 is arranged among time coil 2, that is to say, described passive shimming spare 3 integrates with described coil 2, can not occupy effective inspection space like this, effectively utilize the space between the gradient coil, and need not to enlarge the size of magnet, saved the cost of magnet.
Certainly, it should be understood by those skilled in the art that described passive shimming spare 3 also can integrate with main coil 1.
Referring to Fig. 3, also be furnished with cooling line 4 respectively in described main coil 1 and described coil 2.
Referring to Fig. 4, in order to guarantee the fixed distance between main coil 1, the inferior coil 2, described main coil 1 and described coil 2 are fixed on the cascaded surface of magnet unit 51,53 of described magnet by a fixture 61,63 respectively, make the relative distance that described main coil 1 and described coil 2 are maintained fixed each other.
As shown in Figure 4, described magnet is to be combined by a plurality of independent magnet unit to constitute, shown in the figure three independent magnet unit 51,52,53, these three independent magnet unit, 51,52,53 stepped arrangements are as described in main coil 1 and time coil 2 are fixed on by fixture (as bolt) 61,63 respectively on wherein two cascaded surfaces of three magnet unit.
Since 3 pairs of temperature of passive shimming spare sensitivity very, this version of the present utility model, and 4 pairs of passive shimming spares 3 of cooling line that can also make full use of main coil 1 or inferior coil 2 cool off, thereby effectively control the temperature of passive shimming spare 3.
In addition, as illustrated in Figures 5 and 6, the cooling line 4 of described coil 2 is structure in the shape of a spiral, it has a cooling liquid inlet 41 and a cooling liquid outlet 42, in order fully to cool off magnet spaces, described passive shimming spare 3 is arranged between the spiral helicine cooling line 4, thereby not only can be so that cooling line 4 cools off passive shimming spare 3 and time coil 2 simultaneously, but also made full use of magnet spaces, saved cost.
Certainly, it will be appreciated by those skilled in the art that the cooling line shown in Fig. 5 and Fig. 64 and the arrangement form of passive shimming spare 3 are equally applicable to main coil 1.
Other structures and the embodiment 1 of present embodiment are identical, describe no longer one by one at this.
The above only is the schematic embodiment of the utility model, is not in order to limit scope of the present utility model.Any those skilled in the art, equivalent variations, the modification of being done under the prerequisite that does not break away from design of the present utility model and principle and combining all should belong to the scope of the utility model protection.
Claims (10)
1. gradient coil, described gradient coil is arranged on a magnet (51,52,53) in, described gradient coil comprises a main coil (1) and one coil (2), have a gap (S) between described main coil (1) and described the coil (2), it is characterized in that, a passive shimming spare (3) is arranged in described gradient coil internal placement.
2. gradient coil according to claim 1 is characterized in that, described passive shimming spare (3) is arranged in the described gap (S) between described main coil (1) and described the coil (2).
3. gradient coil according to claim 2, it is characterized in that, described main coil (1), described coil (2) and described passive shimming spare (3) are respectively by a fixture (61,62,63) be fixed on described magnet (51,52,53) on, make the relative distance that described main coil (1), described coil (2) and described passive shimming spare (3) are maintained fixed each other.
4. gradient coil according to claim 2 is characterized in that, is furnished with cooling line (4) respectively in described main coil (1) and described the coil (2).
5. gradient coil according to claim 1 is characterized in that, described passive shimming spare (3) is arranged in described main coil (1) or described coil (2) inside.
6. according to claim 2 or 5 described gradient coils, it is characterized in that described gradient coil is flat gradient coil.
7. gradient coil according to claim 5, it is characterized in that, described main coil (1) and described coil (2) are respectively by a fixture (61,63) be fixed on described magnet (52,53) on, make the relative distance that described main coil (1) and described coil (2) are maintained fixed each other.
8. gradient coil according to claim 5 is characterized in that, is furnished with cooling line (4) respectively in described main coil (1) and described the coil (2).
9. gradient coil according to claim 8 is characterized in that, described cooling line (4) is a helical structure.
10. gradient coil according to claim 9 is characterized in that, described passive shimming spare (3) is arranged between the described cooling line (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920145229U CN201387479Y (en) | 2009-03-12 | 2009-03-12 | Gradient coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920145229U CN201387479Y (en) | 2009-03-12 | 2009-03-12 | Gradient coil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201387479Y true CN201387479Y (en) | 2010-01-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200920145229U Expired - Fee Related CN201387479Y (en) | 2009-03-12 | 2009-03-12 | Gradient coil |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103576113A (en) * | 2012-07-26 | 2014-02-12 | 西门子(深圳)磁共振有限公司 | Superconducting magnet and shimming device and method thereof |
| CN105699922A (en) * | 2016-04-02 | 2016-06-22 | 苏州科技学院 | Magnetic resonance equipment |
| CN105866717A (en) * | 2016-05-28 | 2016-08-17 | 苏州科技学院 | Gradient coil component and magnetic resonance equipment |
-
2009
- 2009-03-12 CN CN200920145229U patent/CN201387479Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103576113A (en) * | 2012-07-26 | 2014-02-12 | 西门子(深圳)磁共振有限公司 | Superconducting magnet and shimming device and method thereof |
| CN103576113B (en) * | 2012-07-26 | 2016-06-08 | 西门子(深圳)磁共振有限公司 | A kind of superconducting magnet and shimming device thereof and method for shimming |
| CN105699922A (en) * | 2016-04-02 | 2016-06-22 | 苏州科技学院 | Magnetic resonance equipment |
| CN105866717A (en) * | 2016-05-28 | 2016-08-17 | 苏州科技学院 | Gradient coil component and magnetic resonance equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SIEMENS (SHENZHEN) MAGNETIC RESONANCE CO., LTD. Free format text: FORMER NAME: SIEMENS MINDIT (SHENZHEN) MAGNETIC RESONANCE LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 518057 two SIEMENS magnetic resonance garden, central high tech Zone, Guangdong, Shenzhen Patentee after: Siemens (Shenzhen) Magnetic Resonance Ltd. Address before: 518057 two SIEMENS magnetic resonance garden, central high tech Zone, Guangdong, Shenzhen Patentee before: Siemens Mindit (Shenzhen) Magnetic Resonance Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100120 Termination date: 20170312 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |