CN102288928B - Radio frequency coil device for magnetic resonance imaging system - Google Patents
Radio frequency coil device for magnetic resonance imaging system Download PDFInfo
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- CN102288928B CN102288928B CN 201110221013 CN201110221013A CN102288928B CN 102288928 B CN102288928 B CN 102288928B CN 201110221013 CN201110221013 CN 201110221013 CN 201110221013 A CN201110221013 A CN 201110221013A CN 102288928 B CN102288928 B CN 102288928B
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Abstract
The invention discloses a radio frequency coil device for a magnetic resonance imaging system. The device comprises an inner shell and a coil part, wherein the coil part is fixed on the inner shell; the inner shell has a shoe shape; the coil part comprises five saddle-shaped coils, wherein a first coil, a second coil and a third coil are used for acquiring signals from a shank, an ankle to a sole part; the first coil covers a shoe sleeve part of the inner shell; the second coil covers a shoe sleeve part and an upper part of the inner shell; the third coil covers a sole rear end part and the upper part of the inner shell; a fourth coil and a fifth coil are used for acquiring signals of an instep and a toe part; the fourth coil covers an instep part, the upper part and a sole middle part of the inner shell; and the fifth coil covers the instep part, the upper part and a sole front end part of the inner shell. The coil device can completely cover the whole foot, and has good uniformity and high conversion efficiency. Moreover, better imaging quality is achieved.
Description
Technical field
The present invention relates to nuclear magnetic resonance imaging system (MRI).Particularly, relate to a kind of coil device for nuclear magnetic resonance imaging system.
Background technology
In the modern medical service technology, nuclear magnetic resonance imaging system is a kind of being widely used and the common armarium of outstanding effect, and the research and development of relevant nuclear magnetic resonance imaging system are also in constantly carrying out.In nuclear magnetic resonance imaging system, a coil device is arranged, driven by radio frequency (RF) power amplifier, be used for producing in a big as far as possible zone radio-frequency (RF) magnetic field of equally distributed certain intensity.
Because the performance of coil device is very big to the performance impact of nuclear magnetic resonance imaging system, so the quality of coil device performance is very important, and the quality of its performance mainly is two indexs:
L, homogeneity range namely reach 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 more big radio frequency sending set of power is just more expensive, 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 the version that generally adopts has at present:
L, 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 uniformity 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 mental 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 uniformity of butterfly shaped coils is very bad, and efficient is also lower.
3, solenoid coil, this coil is more suitable for the field system that steady magnetic field is vertical direction, but solenoid coil is subjected to the influence of metal object on every side easily, special when the close solenoid coil of metal object, efficient obviously reduces when exciting object to be seen, and conversion efficiency obviously descends when detecting the magnetic resonance signal that produces in the object to be seen.
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.
Summary of the invention
The object of the present invention is to provide a kind of coil device for nuclear magnetic resonance imaging system, have uniformity and high conversion rate preferably.
Technical scheme of the present invention is as follows:
A kind of coil device for nuclear magnetic resonance imaging system comprises inner shell and coiler part, and coiler part is fixed on the inner shell;
Inner shell is designed to the shape of shoes, specifically is divided into footwear tube part, upper portion, upper of a shoe part, sole fore-end, sole mid portion, sole rear end part;
Coiler part comprises 5 saddle coils, all overlaps between per two adjacent saddle coils, and 5 saddle coils specifically are first coil, second coil, tertiary coil, the 4th coil, the 5th coil;
First coil to tertiary coil be used for to be gathered the signal from shank, ankle to the sole position, first coil covers the footwear tube part of inner shell, second coil covers footwear tube part and the upper of a shoe part of inner shell, and tertiary coil covers sole rear end part and the upper of a shoe part of inner shell;
The 4th coil and the 5th coil are used for gathering the signal at instep and toe position, and the 4th coil covers upper portion, upper of a shoe part, the sole mid portion of inner shell, and the 5th coil covers upper portion, upper of a shoe part and the sole fore-end of inner shell.
Described coil device for nuclear magnetic resonance imaging system, wherein, coiler part also comprises 3 solenoid coils, and the axis direction of 3 solenoid coils is identical, and 3 solenoid coils specifically are the 6th coil, the 7th coil, the 8th coil;
The 6th coil is used for the auxiliary signal of gathering ankle and sole position, and the 6th coil covers sole rear end part, upper of a shoe part and the footwear tube part of inner shell;
The 7th coil and the 8th coil are used for the auxiliary signal of gathering instep and toe position, and the 7th coil covers upper portion, upper of a shoe part and the sole mid portion of inner shell, and the 8th coil covers upper portion, upper of a shoe part and the sole fore-end of inner shell.
Described coil device for nuclear magnetic resonance imaging system, wherein, coiler part also comprises various electronic components, electronic component is serially connected in each coil.
Described coil device for nuclear magnetic resonance imaging system, wherein, each coil all adopts copper strips to make.
Described coil device for nuclear magnetic resonance imaging system wherein, also comprises shell, and shell is fixedlyed connected with inner shell, is used for covering coiler part.
The invention has the beneficial effects as follows:
Exciting and receiving all of radio-frequency (RF) magnetic field finished by radio-frequency coil.For receiving coil, it is vital improving conversion efficiency.In general, less coil and more close imaging object can obtain high conversion rate.In order to cover bigger imaging region, need to use a plurality of coils around whole imaging object.Coil device of the present invention has satisfied above-mentioned requirements, and the whole foot of covering that can be complete has uniformity and high conversion rate preferably, and image quality is preferable.
Description of drawings
Fig. 1 is the sketch map of the coil device for nuclear magnetic resonance imaging system of the present invention.
Fig. 2 to Fig. 9 is respectively the shape sketch map of first coil to the, eight coils.
The specific embodiment
Below with reference to accompanying drawing, the specific embodiment of the present invention and embodiment are described in detail, described specific embodiment is not for limiting the specific embodiment of the present invention only in order to explain the present invention.
See also Fig. 1, the coil device for nuclear magnetic resonance imaging system of the present invention comprises inner shell 10, coiler part and shell.Coiler part is fixed on the inner shell 10, and shell is fixedlyed connected with inner shell 10, is used for covering coiler part.
Coiler part comprises 8 coils and electronic components (optionally) such as various inductance, electric capacity, and electronic component is serially connected in the coil.Coil can adopt copper strips to make.
Fig. 2 to Fig. 9 has illustrated the shape of 8 coils (first coil, 21 to the 8th coils 28) respectively.Wherein, first coil, 21 to the 5th coils 25 are saddle coil, and the 6th coil 26 to the 8th coils 28 are solenoid coil.The axis direction of three solenoid coils is identical.First coil, 21 to the 5th coils 25 are absolutely necessary, and the 6th coil 26 to the 8th coils 28 are optional.All overlap between per two adjacent saddle coils.Overlapping effect is to remove mutual coupling (be total magnetic flux be zero) the overlapping region in.
The 4th coil 24 and the 5th coil 25 are used for gathering the signal at instep and toe position.The 4th coil 24 covers upper portion, upper of a shoe part, the sole mid portion of inner shell 10, and the 5th coil 25 covers upper portion, upper of a shoe part and the sole fore-end of inner shell 10.
The 6th coil 26 is used for the auxiliary signal of gathering ankle and sole position, and the 6th coil 26 covers sole rear end part, upper of a shoe part and the footwear tube part of inner shell 10.
The 7th coil 27 and the 8th coil 28 are used for the auxiliary signal of gathering little joint parts such as instep and toe, the 7th coil 27 covers upper portion, upper of a shoe part and the sole mid portion of inner shell 10, and the 8th coil 28 covers upper portion, upper of a shoe part and the sole fore-end of inner shell 10.
In imaging process, coil device of the present invention is covered on people's foot, can carry out scanning imagery to people's foot.
Exciting and receiving all of radio-frequency (RF) magnetic field finished by radio-frequency coil.For receiving coil, it is vital improving conversion efficiency.In general, less coil and more close imaging object can obtain high conversion rate.In order to cover bigger imaging region, need to use a plurality of coils around whole imaging object.Coil device of the present invention has satisfied above-mentioned requirements, and the whole foot of covering that can be complete has uniformity and high conversion rate preferably, and image quality is preferable.
Should be understood that application of the present invention is not limited to above-mentioned giving an example, for those of ordinary skills, can be improved according to the above description or conversion that all these improvement and conversion all should belong to the protection domain of claims of the present invention.
Claims (5)
1. a coil device that is used for nuclear magnetic resonance imaging system is characterized in that comprise inner shell and coiler part, coiler part is fixed on the inner shell;
Inner shell is designed to the shape of shoes, specifically is divided into footwear tube part, upper portion, upper of a shoe part, sole fore-end, sole mid portion, sole rear end part;
Coiler part comprises 5 saddle coils, all overlaps between per two adjacent saddle coils, and 5 saddle coils specifically are first coil, second coil, tertiary coil, the 4th coil, the 5th coil;
First coil to tertiary coil be used for to be gathered the signal from shank, ankle to the sole position, first coil covers the footwear tube part of inner shell, second coil covers footwear tube part and the upper of a shoe part of inner shell, and tertiary coil covers sole rear end part and the upper of a shoe part of inner shell;
The 4th coil and the 5th coil are used for gathering the signal at instep and toe position, and the 4th coil covers upper portion, upper of a shoe part, the sole mid portion of inner shell, and the 5th coil covers upper portion, upper of a shoe part and the sole fore-end of inner shell.
2. the coil device for nuclear magnetic resonance imaging system according to claim 1, it is characterized in that, coiler part also comprises 3 solenoid coils, and the axis direction of 3 solenoid coils is identical, and 3 solenoid coils specifically are the 6th coil, the 7th coil, the 8th coil;
The 6th coil is used for the auxiliary signal of gathering ankle and sole position, and the 6th coil covers sole rear end part, upper of a shoe part and the footwear tube part of inner shell;
The 7th coil and the 8th coil are used for the auxiliary signal of gathering instep and toe position, and the 7th coil covers upper portion, upper of a shoe part and the sole mid portion of inner shell, and the 8th coil covers upper portion, upper of a shoe part and the sole fore-end of inner shell.
3. the coil device for nuclear magnetic resonance imaging system according to claim 1 is characterized in that, coiler part also comprises various electronic components, and electronic component is serially connected in each coil.
4. the coil device for nuclear magnetic resonance imaging system according to claim 1 is characterized in that, each coil all adopts copper strips to make.
5. the coil device for nuclear magnetic resonance imaging system according to claim 1 is characterized in that, also comprises shell, and shell is fixedlyed connected with inner shell, is used for covering coiler part.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110221013 CN102288928B (en) | 2011-08-03 | 2011-08-03 | Radio frequency coil device for magnetic resonance imaging system |
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| CN 201110221013 CN102288928B (en) | 2011-08-03 | 2011-08-03 | Radio frequency coil device for magnetic resonance imaging system |
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| CN102288928A CN102288928A (en) | 2011-12-21 |
| CN102288928B true CN102288928B (en) | 2013-08-21 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104569879A (en) * | 2015-01-12 | 2015-04-29 | 上海联影医疗科技有限公司 | Ankle coil assembly and use method thereof |
| CN106707207A (en) * | 2015-11-13 | 2017-05-24 | 上海联影医疗科技有限公司 | Radio frequency coil assembly for magnetic resonance imaging |
| CN105487029A (en) * | 2015-12-23 | 2016-04-13 | 深圳市特深电气有限公司 | Multichannel radio frequency coil device for NMR imaging system |
| CN107305242A (en) * | 2016-04-25 | 2017-10-31 | 南通大学附属医院 | Coil device for finger magnetic resonance imaging |
| CN109350060B (en) * | 2018-10-17 | 2023-12-05 | 四川大学华西医院 | Nuclear magnetic resonance ankle joint coil device |
| CN111220936B (en) * | 2018-11-23 | 2023-05-26 | 西门子(深圳)磁共振有限公司 | Ankle coil |
Citations (1)
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| US5277183A (en) * | 1992-06-22 | 1994-01-11 | Medical Advances, Inc. | NMR local coil for foot imaging |
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| JPH0576510A (en) * | 1991-09-19 | 1993-03-30 | Hitachi Ltd | Inspecting device using nuclear magnetic resonance |
| JPH0767848A (en) * | 1993-09-01 | 1995-03-14 | Nippon Telegr & Teleph Corp <Ntt> | Biomagnetism measuring instrument and biomagnetism measuring method |
| US20040220469A1 (en) * | 2003-05-02 | 2004-11-04 | Jovan Jevtic | Knee-foot coil with improved homogeneity |
| WO2005006007A1 (en) * | 2003-06-30 | 2005-01-20 | General Electric Company | Open peripheral vascular coil and method of providing peripheral vascular imaging |
| CN2768019Y (en) * | 2004-12-24 | 2006-03-29 | 上海辰光医疗科技有限公司 | Foot/knee associated RF winding device for magnetic resonance image system |
| JP4576534B2 (en) * | 2006-03-28 | 2010-11-10 | 国立大学法人 筑波大学 | Magnetic resonance imaging apparatus and imaging method |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5277183A (en) * | 1992-06-22 | 1994-01-11 | Medical Advances, Inc. | NMR local coil for foot imaging |
Non-Patent Citations (5)
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| JP特开2007-260001A 2007.10.11 |
| JP特开平5-76510A 1993.03.30 |
| JP特开平7-67848A 1995.03.14 |
| 丁美新等.磁共振成像鞍型射频线圈的优化设计.《上海交通大学学报》.1996,第30卷(第5期),全文. |
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Address after: 518107 area 301c, building 201, 301, 501, 5, building 4, Jihui mould Industrial Park, Tianliao Avenue, Tianliao community, Yutang street, Guangming District, Shenzhen City, Guangdong Province Patentee after: Shenzhen RF Tech Co., Ltd. Address before: 518132 Guangdong Province, Shenzhen Guangming District Tianliao Juhui Industrial Park 4 2 floor Patentee before: Shenzhen RF Tech Co., Ltd. |