CN2525533Y - Radio frequency coil device used for magnetic resonance imaging system - Google Patents
Radio frequency coil device used for magnetic resonance imaging system Download PDFInfo
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- CN2525533Y CN2525533Y CN 01234278 CN01234278U CN2525533Y CN 2525533 Y CN2525533 Y CN 2525533Y CN 01234278 CN01234278 CN 01234278 CN 01234278 U CN01234278 U CN 01234278U CN 2525533 Y CN2525533 Y CN 2525533Y
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- resonance imaging
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Abstract
The utility model discloses a radio frequency coil device used for magnetic resonance imaging system. The technical proposal of the utility model does not use the coil internal magnetic field which is used by the prior art, but uses the external magnetic field of the coil. A plurality of ring-shaped strip-like coils are divided into two groups, the plane of each coil is overlaid in turn with spacing in the two groups of coil, the planes respectively formed by the two groups of coil are parallel one another. A capacitor connected in series or the inductance of the coil is used for coupling among the coils. A large uniform area can be obtained by adjusting the dimension and the shape of the coil; simultaneously the shape of the magnetic body is unlimited, the power efficiency is very high.
Description
Technical field the utility model relates to a kind of coil device, especially relates to a kind of coil device that is applied to magnetic resonance imaging system.
Background technology is in the medical skill in modern times, and magnetic resonance imaging system is a kind of being widely used and the common Medical Devices of outstanding effect, and the research and development of relevant magnetic resonance imaging system are also in constantly carrying out.In magnetic resonance imaging system, a coil device is all arranged, drive by radio frequency (RF) power amplifier, be used on a big as far as possible zone, producing the radio-frequency (RF) magnetic field of equally distributed certain intensity.
Because the performance of above-mentioned coil device is very big to the performance impact of magnetic resonance imaging system, so the quality of coil device performance is very important, and the quality of its performance mainly is two indexs:
1, homogeneity range promptly reaches evenly the distribute size in zone of requirement of radio-frequency (RF) magnetic field, and this zone is the bigger the better;
2, conversion efficiency, the transmit power transition that is about to radio frequency sending set is the efficient of radio-frequency (RF) magnetic field magnetic energy, because radio frequency sending set price comparison costliness, and the big more radio frequency sending set of power is just expensive more, just do not need too powerful radio frequency sending set if having high conversion rate, can reduce cost.
Concerning coil device itself, the main factor that influences its performance is the version of coil device, and what generally adopt at present is two kinds of versions:
1, saddle coil, its general shape are similar to a saddle, so the name saddle coil.Its advantage is that the magnetic field homogeneity of coil generation is relatively good, and conversion efficiency is also than higher.But, saddle coil is extremely responsive to radio frequency environment, and needs the magnet symmetry, otherwise the variation that its homogeneity and conversion efficiency all can be rapid.So just magnetic resonance imaging system can only be made the comparatively cylindric or similar shape of sealing, and such shape is unaccommodated to the patient who suffers from melancholia, claustrophobia or some other similar conditions, can produce serious psychological pressure to them.
2, butterfly shaped coils, the advantage of this coil are to make the structure of split blade type, and also not high to the requirement of magnet shape, but the homogeneity of butterfly shaped coils is very bad, and efficient is also lower.
Can know that from above introduction the shape of the different discharging modes of coil and coil is very big to the influence of radio frequency coil performance in the radio-frequency coil, how discharge the performance quality that difform coil in the radio-frequency coil has often determined radio-frequency coil.
The summary of the invention the purpose of this utility model is: proposes a kind of coil device, can take into account the shape of various magnets, and promptly not high to the radio frequency environmental requirement, and also homogeneity and conversion efficiency are all than higher.
The purpose of this utility model is achieved in that a kind of coil device that is applied to magnetic resonance imaging system, comprises a power divider or a power combiner,
And,
Above-mentioned coil device also comprises two groups of ring-type bar shaped coils;
Every group of wherein above-mentioned ring-type bar shaped coil all comprises some coils, and each coil plane is stacked successively and have at interval in every group;
The plane that two groups of above-mentioned ring-type bar shaped coils constitute respectively is set to parallel.
Simultaneously,
The plane parallel at each coil place is set in two groups of above-mentioned ring-type bar shaped coils.
Connect between the adjacent windings in every group of above-mentioned ring-type bar shaped coil an electric capacity is set, above-mentioned electric capacity is used to carry out capacitive coupling; The coiling direction of each coil in two groups of above-mentioned ring-type bar shaped coils is identical.
Be set to open circuit each other between each coil in every group of above-mentioned ring-type bar shaped coil.
The electric capacity of one series connection all is set on above-mentioned each coil that opens circuit each other, and above-mentioned electric capacity is used to make the whole winding device to be tuned in frequency of operation, and the inductance of each above-mentioned coil utilization itself is coupled mutually.
Two groups of above-mentioned ring-type bar shaped coils respectively are provided with a skeleton, are used for supporting each coil of two groups of coils.
Above-mentioned skeleton is made by no magnetic insulation material.
Adopt above-mentioned technical scheme, just can realize the purpose of this utility model.Because technical scheme of the present invention is actually the magnetic field that utilizes coil loop outer, i.e. magnetic field between two coils or the two groups of coils, when two coils when in pairs the symmetry discharging is used on the Z axle, the homogeneity on the magnetic field Z direction in two coil adjacent edge outsides is improved greatly; When the length breadth ratio of each coil is big more, the magnetic field homogeneity of directions X is good more; Simultaneously, adopt manyly, the magnetic field homogeneity of Y direction is improved the ring-type bar shaped coil.This shows that the adjustment by to every group of concrete size of coil and distribution shape can produce very big homogeneity range.
Simultaneously,, add the reinforcement in the magnetic field that under radio frequency environment image current produces two groups of ring-type bar shaped coils, make that coil power efficient is higher because these two groups of ring-type bar shaped coils are to use in pairs.
Because to the length of stube cable between two groups of coils and cloth line morphology without limits, the performance of coil device and magnet shape are had nothing to do, promptly this coil device is not high to the radio frequency environmental requirement again.
Description of drawings is described preferred embodiment of the present utility model in detail below in conjunction with accompanying drawing, by the detailed description to the utility model preferred embodiment, can more clearly find out advantage of the present utility model place.
Fig. 1 is the theoretical synoptic diagram of existing butterfly shaped coils;
Fig. 2 is the theoretical synoptic diagram of existing saddle coil;
Fig. 3 is the better theoretical explanation synoptic diagram of the utility model homogeneity;
Fig. 4 is that each coil passes through capacity coupled synoptic diagram in the utility model;
Fig. 5 be in the utility model each coil by the synoptic diagram of inductive coupling own.
Embodiment such as Fig. 1, in butterfly shaped coils, each is that in one plane rotational symmetry is discharged to coil, its coiling direction is as shown in the figure in the same way, according to the right-handed helix theorem, the magnetic line of force direction that two coils are produced is just in time opposite, and produces a magnetic field on the direction vertical with coil plane.Such coil discharging modes are not high to the requirement of magnet shape, but homogeneity is bad, can also learn that by calculating its power efficiency is not high yet.
As Fig. 2, in saddle coil, the coil of two saddle types is staggered relatively, and the direction of the winding current also is in the same way, so the magnetic line of force that two coils produce is relative, because two coils are staggered relatively, and relatively sealing again, its magnetic field homogeneity than the inside of enclosure space is relatively good.All than higher, and but the magnetic resonance imaging system of making thus can only make the tubular of sealing to this coil discharging modes to the requirement of radio frequency environment and magnet shape.
As Fig. 3, two bar shaped coils to be placed in one plane, the long limit of two coils is parallel with X-axis, and minor face is parallel with the Z axle, and the normal on plane, two coil places is parallel with Y-axis.The utility model utilization be magnetic field between two adjacent long limits of two coils.Change the length on the long limit of coil, the magnetic field homogeneity of X-direction can constantly improve along with the increase of the long edge lengths of coil.And the magnetic field of Z-direction between two coils, by Theoretical Calculation and experimental verification, its homogeneity is also fine.As for the homogeneity of Y direction, if be provided with manyly along Y direction, also can improve, and the coil logarithm is many more to coil, homogeneity is good more.
As Fig. 4, adopt each other plane, place mode parallel to each other to discharge between each coil, keep certain intervals between each coil each other, each wire loop is connected, and the electric capacity 10 of also connecting between the adjacent windings, electric capacity 10 are used for each coil is carried out the current potential of capacitive coupling and even each coil.In one group of coil, the coiling direction of each wire loop is identical.Two coils of outermost end are connected on power combiner or the power divider by radio-frequency cable.Adopt a skeleton of making by no magnetic insulation material at last, each coil support in every group of ring-type bar shaped coil is fixed up.
As Fig. 5, at first some ring-type bar shaped coils are divided into two groups, each coil parallel stacked and having at interval successively arranges into parallel in the plane of formation two groups of ring-type bar shaped coils institute respectively again in two groups of coils.Keep opening circuit between each wire loop of every group of coil, the electric capacity 12 of also connecting on each wire loop, the coupling of each coil is to utilize the inductance of each coil itself to carry out.Two coils of outermost end are connected on power combiner or the power divider by radio-frequency cable.Adopt a skeleton of making by no magnetic insulation material at last, each coil support in every group of ring-type bar shaped coil is fixed up.
In Fig. 3, Fig. 4 and Fig. 5, the utility model is actual as can be seen is to have utilized the outer magnetic field of coil loop, i.e. magnetic field between two or the two groups of coils, because two or two groups of coils use in pairs and under radio frequency environment image current the reinforcement in magnetic field is made that the power efficiency of radio-frequency coil is higher; The length of stube cable and cloth line morphology make the performance of coil device and magnet shape irrelevant without limits between while two groups of coils, that is to say that coil device of the present utility model is not high to the radio frequency environmental requirement.Adjustment by to each coil dimension in every group of coil and substep shape can produce very big homogeneity range.
It is pointed out that on the basis that does not break away from the utility model essence those of ordinary skill in the art can make various suitable distortion or replacement, still, all these distortion or replacement all should belong within the protection domain of the present utility model.
Claims (7)
1, a kind of coil device that is applied to magnetic resonance imaging system comprises a power divider or a power combiner, it is characterized in that: described coil device also comprises two groups of ring-type bar shaped coils;
Wherein said every group of ring-type bar shaped coil all comprises some coils, and each coil plane is stacked successively and have at interval in every group;
The plane that described two groups of ring-type bar shaped coils constitute respectively is set to parallel.
2, a kind of coil device that is applied to magnetic resonance imaging system according to claim 1 is characterized in that: the plane parallel that each coil place is set in described two groups of ring-type bar shaped coils.
3, a kind of coil device that is applied to magnetic resonance imaging system according to claim 1 is characterized in that: connecting between the adjacent windings in described every group of ring-type bar shaped coil is provided with an electric capacity, and described electric capacity is used to carry out capacitive coupling; The coiling direction of each coil in described two groups of ring-type bar shaped coils is identical.
4, a kind of coil device that is applied to magnetic resonance imaging system according to claim 1 is characterized in that: be set to open circuit each other between each coil in described every group of ring-type bar shaped coil.
5, a kind of coil device that is applied to magnetic resonance imaging system according to claim 4, it is characterized in that: the electric capacity that a series connection all is set on described each coil that opens circuit each other, described electric capacity is used to make the whole winding device to be tuned in frequency of operation, and the inductance of described each coil utilization itself is coupled mutually.
6, a kind of coil device that is applied to magnetic resonance imaging system according to claim 1 is characterized in that: described two groups of ring-type bar shaped coils respectively are provided with a skeleton, are used for supporting each coil of two groups of coils.
7, a kind of coil device that is applied to magnetic resonance imaging system according to claim 6, it is characterized in that: described skeleton is made by no magnetic insulation material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01234278 CN2525533Y (en) | 2001-09-26 | 2001-09-26 | Radio frequency coil device used for magnetic resonance imaging system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01234278 CN2525533Y (en) | 2001-09-26 | 2001-09-26 | Radio frequency coil device used for magnetic resonance imaging system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2525533Y true CN2525533Y (en) | 2002-12-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01234278 Expired - Lifetime CN2525533Y (en) | 2001-09-26 | 2001-09-26 | Radio frequency coil device used for magnetic resonance imaging system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2525533Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114217253A (en) * | 2021-10-29 | 2022-03-22 | 江苏力磁医疗设备有限公司 | Debugging device and debugging method for radio frequency coil |
-
2001
- 2001-09-26 CN CN 01234278 patent/CN2525533Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114217253A (en) * | 2021-10-29 | 2022-03-22 | 江苏力磁医疗设备有限公司 | Debugging device and debugging method for radio frequency coil |
| CN114217253B (en) * | 2021-10-29 | 2023-12-01 | 江苏力磁医疗设备有限公司 | Debugging device and method for radio frequency coil |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20010926 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |