CN104155622B - A kind of planar radio frequency coils for nuclear magnetic resonance - Google Patents
A kind of planar radio frequency coils for nuclear magnetic resonance Download PDFInfo
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- CN104155622B CN104155622B CN201410426363.1A CN201410426363A CN104155622B CN 104155622 B CN104155622 B CN 104155622B CN 201410426363 A CN201410426363 A CN 201410426363A CN 104155622 B CN104155622 B CN 104155622B
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- 238000005481 NMR spectroscopy Methods 0.000 title claims abstract description 27
- 238000004804 winding Methods 0.000 abstract description 15
- 230000000694 effects Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002059 diagnostic imaging Methods 0.000 description 1
- 238000004471 energy level splitting Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 230000005311 nuclear magnetism Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Abstract
The invention discloses a kind of planar radio frequency coils for nuclear magnetic resonance, it is included in front coil and purl loop that vertical direction has certain distance and is parallel to each other.The front coil includes coil II, III, and the purl loop includes coil I, IV, and coil II is identical with coil I direction of winding, and coil III is identical with coil IV direction of winding, and coil I and coil III direction of winding are opposite；The coiling of the first geometry subcoil I and the second geometry subcoil II interlaced arrangement of coiling, the coiling of the 3rd geometry subcoil III and the 4th geometry subcoil IV interlaced arrangement of coiling.Provided by the present invention for the planar radio frequency coils of nuclear magnetic resonance, the RF magnetic field of its target area above coil is compared to generally positive " 8 "-shaped coil, and the RF magnetic field uniformity, magnetic field intensity, the quality factor of coil are all improved well.
Description
Technical field
The present invention relates to a kind of planar radio frequency coils, more particularly to a kind of planar radio frequency coils for nuclear magnetic resonance.
Background technology
Nuclear magnetic resonance, is that energy level splitting occurs in the presence of external magnetic field for material atom nuclear magnetic moment, and in additional radio-frequency magnetic
The physical phenomenon of energy level transition is produced in the presence of.Nuclear-magnetism is found from nineteen forty-six American scientist Bloch, Purcell et al.
Since RESONANCE ABSORPTION phenomenon, nuclear magnetic resonance technique has obtained unprecedented development in fields such as Wave Spectrum, medical imagings, greatly pushes away
The progress of human society is moved.
However, common high-field nuclear magnetic resonance equipment, such as nuclear magnetic resonance spectrometer, medical magnetic resonance imager etc., have
The inferior position such as bulky, heavy, poor mobility, makes it in Site Detection (the real-time monitoring to the patient's state of an illness) side of actual sample
The application in face is restricted；In addition, the sample of high-field nuclear magnetic resonance equipment must be placed in having a certain size closed magnetic
It can be measured in body cavity, this prevents high-field nuclear magnetic resonance from carrying out Non-Destructive Testing to the large sample with arbitrary shape.
Low-field nuclear magnetic resonance sensor compensate for height with its opening, the portable, characteristic that can be measured to the sample with arbitrary shape
The deficiency of field nuclear magnetic resonance equipment, is increasingly becoming the advanced subject of nuclear magnetic resonance technique research.
In nuclear magnetic resonance, RF magnetic field is produced by radio-frequency coil.Radio-frequency coil, has concurrently and excites and receive nuclear magnetic resonance letter
Number effect, i.e., radio-frequency pulse effect under triggering sample in specific frequency core occur magnetic resonance, and trigger pulse close
The NMR signal sensed is received afterwards.At present common low-field nuclear magnetic resonance planar radio frequency coils have planar spiral winding and
Figure of eight planar coil.Planar spiral winding is the design philosophy based on single electric current current-carrying conductor, the RF magnetic field of generation perpendicular to
Coil surface；Figure of eight planar coil is the design philosophy based on two current-carrying rings for flowing through reverse current, the radio-frequency magnetic of generation
Field is parallel to coil surface.
According to nuclear magnetic resonance principle, it is quiet that the RF magnetic field that radio-frequency coil is produced will be produced in target area with magnet structure
Magnetic field orthotropic；RF magnetic field is as far as possible uniform, to excite more samples to resonate；The magnetic field intensity of RF magnetic field will try one's best
Greatly, the NMR signal received is made to try one's best greatly.
For generation magnetostatic field perpendicular to the magnet structure of magnet surface, radio-frequency coil often uses figure of eight planar coil,
So that its RF magnetic field produced is orthogonal with the magnetostatic field that magnet structure is produced in target area.However, the common positive figure of eight
The magnetic field homogeneity of the RF magnetic field that planar radio frequency coils are produced in target area is poor, magnetic field intensity is smaller, coil quality
Factor is not high.
The content of the invention
In view of this, it is an object of the invention to provide a kind of planar radio frequency coils for nuclear magnetic resonance, above coil
The RF magnetic field uniformity, magnetic field intensity, the quality factor of coil of target area are all improved well.
The purpose of the present invention realized by such technical scheme, a kind of multi-planar radio frequency line for nuclear magnetic resonance
Circle, including the front coil and purl loop being parallel to each other；The front coil has one in vertical direction with purl loop
Set a distance；The front coil includes the second geometry subcoil II and the 3rd geometry subcoil III, and the purl loop includes the
One geometry subcoil I and the 4th geometry subcoil IV；First geometry subcoil I, the second geometry subcoil II, the 3rd geometry sub-line
Circle III and the 4th geometry subcoil IV is sequentially connected in series；The first geometry subcoil I and the second geometry subcoil II is around to phase
Together, the coiling of the first geometry subcoil I and the second geometry subcoil II interlaced arrangement of coiling；3rd geometry
Subcoil III and the 4th geometry subcoil IV are around to identical, coiling and the 4th geometry of the 3rd geometry subcoil III
The interlaced arrangement of coil IV coiling；The second geometry subcoil II and the 3rd geometry subcoil III are around to opposite；Institute
State the first geometry subcoil I and the 4th geometry subcoil IV is in the same plane, the second geometry subcoil II and the 3rd
Geometry subcoil III is in the same plane.
Further, the RF magnetic field that target area is produced above radio-frequency coil is parallel to radio-frequency coil surface.
Further, the unnecessary second geometry subcoil II of the number of turn of the first geometry subcoil I number of turn；Described more than three
What the subcoil III unnecessary 4th geometry subcoil IV of the number of turn number of turn.
Further, it is laid with shading ring V on the outside of the front coil.
By adopting the above-described technical solution, the present invention has the advantage that：Provided by the present invention for nuclear magnetic resonance
Planar radio frequency coils, the RF magnetic field of its target area above coil is compared to generally positive " 8 "-shaped coil, and RF magnetic field is equal
Evenness, magnetic field intensity, the quality factor of coil are all improved well.
Brief description of the drawings
In order that the object, technical solutions and advantages of the present invention are clearer, below in conjunction with accompanying drawing the present invention is made into
The detailed description of one step, wherein：
Fig. 1 is 30 ° of direction top views of planar radio frequency coils；
Fig. 2 is planar radio frequency coils top view；
Fig. 3 is front coil structural representation provided in an embodiment of the present invention；
Fig. 4 is purl loop structural representation provided in an embodiment of the present invention；
Fig. 5 is planar radio frequency coils upper area magnetic vector directional diagram provided in an embodiment of the present invention；
Fig. 6 is planar radio frequency coils upper area magnetic field amplitude distribution map provided in an embodiment of the present invention.
Embodiment
Below with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail；It should be appreciated that preferred embodiment
Only for the explanation present invention, the protection domain being not intended to be limiting of the invention.
As shown in Figure 1, 2, provided by the present invention for the planar radio frequency coils of nuclear magnetic resonance, radio-frequency coil is two-sided knot
Structure, includes two flat sub-coils being parallel to each other：Front coil and purl loop.Radio-frequency coil target above coil
The RF magnetic field that region is produced is parallel to coil surface, it is adaptable to which coordinating with magnetostatic field perpendicular to the magnet structure of magnet surface makes
With.
The front coil is identical with the shape of purl loop.The front coil is approximate by multiple shapes with purl loop
Several coils of geometry constitute.
The front coil has certain distance in vertical direction with purl loop；The front coil includes more than the second
What subcoil II and the 3rd geometry subcoil III, the purl loop includes the first geometry subcoil I and the 4th geometry subcoil
IV；First geometry subcoil I, the second geometry subcoil II, the 3rd geometry subcoil III and the 4th geometry subcoil IV go here and there successively
Connection；The first geometry subcoil I and the second geometry subcoil II are around to identical, the coiling of the first geometry subcoil I
With the second geometry subcoil II interlaced arrangement of coiling；The 3rd geometry subcoil III and the 4th geometry subcoil IV
Around to identical, the coiling of the 3rd geometry subcoil III and the 4th geometry subcoil IV interlaced arrangement of coiling；Institute
The second geometry subcoil II and the 3rd geometry subcoil III are stated around to opposite；The first geometry subcoil I and the 4th geometry
Subcoil IV is in the same plane, and the second geometry subcoil II and the 3rd geometry subcoil III are in the same plane.
The unnecessary second geometry subcoil II of the number of turn of the first geometry subcoil I number of turn；The 3rd geometry sub-line
Enclose the III unnecessary 4th geometry subcoil IV of the number of turn number of turn.
Shading ring V is laid with the outside of the front coil, in practical operation, shading ring ground connection is made an uproar to reduce outside
Interference of the sound to signal.
Geometry subcoil of the present invention is " D " type, rectangle, square or other polygonal one kind, the present invention
Illustrated in embodiment with " D " type coil.
In the present embodiment, two " D " type coils (i.e. coil II and coil III) constitute a similar circular frontal line
Circle, two " D " type coils (i.e. coil I and coil IV) constitute a similar circular purl loop.
Coil II is identical with coil I direction of winding, and coil III is identical with coil IV direction of winding, coil I and coil
III direction of winding is opposite.The direction of winding of two coils is identical, and the RF magnetic field direction of generation is consistent, enhances radio-frequency magnetic
The intensity of field.As explanation, by taking left half of coil windings (i.e. the winding of coil I and coil II compositions) as an example.If electric current is from line
Circle I lead enters coil, and flow direction of the electric current in coil I is counterclockwise；Electric current is by vertically drawing between coil I, II
Line enters coil II, in No. II coil flow direction also for counterclockwise；Electric current is same in the RF magnetic field that left half-coil winding is produced
It is upward for vertical paper.Electric current enters coil III from coil II by the vertical leads between coil II, III, then in coil
Current direction in III is clockwise, and the current direction in coil IV is also clockwise, so, in right half of coil windings
The RF magnetic field of middle generation is all that vertical paper is downward, enhances RF magnetic field intensity.Meanwhile, the winding of front coil and correspondingly
Below the interlaced arrangement in the gap of the winding of the purl loop of lower section, i.e. front coil coiling it is corresponding be purl loop around
Gap between group, the wire structures that so stagger can reduce parasitic capacitance and eddy current effect to target area magnetic field above radio-frequency coil
Influence.
Fig. 3 is front coil structural representation.Shading ring is laid on the outside of coil, external noise is reduced and signal is done
Disturb.The coiling line width of radio-frequency coil is 0.5mm in the embodiment, and line spacing is 1.0mm, and vertical leads thickness is 0.2mm, shielding
The overall diameter of ring is 40mm.
Fig. 4 is purl loop structural representation.Unlike purl loop and front coil：1) purl loop is not shielded
Ring；2) half of purl loop many 1 circles more each than front coil or so, the i.e. radius of purl loop than the interior loop of front coil
Footpath has more 0.75mm.
Fig. 5 is planar radio frequency coils upper area magnetic vector directional diagram provided in an embodiment of the present invention.Above coil
Intermediate region, magnetic direction and coil surface collimation are preferable.The target area marked is apart from coil upper surface 0.6mm
Place, 0.8mm*0.8mm*0.8mm region.The planar radio frequency coils RF magnetic field that target area is produced above coil is parallel
In coil surface, it is adaptable to which the magnet structure with magnetostatic field perpendicular to magnet surface is used cooperatively.
Fig. 6 is planar radio frequency coils upper area magnetic field amplitude distribution map provided in an embodiment of the present invention.In target area
Interior, the uniformity of RF magnetic field is preferable.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, it is clear that those skilled in the art
Member can carry out various changes and modification to the present invention without departing from the spirit and scope of the present invention.So, if the present invention
These modifications and variations belong within the scope of the claims in the present invention and its equivalent technologies, then the present invention is also intended to include these
Including change and modification.
Claims (3)
1. a kind of planar radio frequency coils for nuclear magnetic resonance, it is characterised in that：Including the front coil being parallel to each other and reverse side
Coil；The front coil has certain distance in vertical direction with purl loop；The front coil includes the second geometry
Subcoil（II）With the 3rd geometry subcoil（III）, the purl loop include the first geometry subcoil（I）With the 4th geometry
Coil（IV）；First geometry subcoil（I）, the second geometry subcoil（II）, the 3rd geometry subcoil（III）With the 4th geometry
Coil（IV）It is sequentially connected in series；The first geometry subcoil（I）With the second geometry subcoil（II）Around to identical, described first
Geometry subcoil（I）Coiling and the second geometry subcoil（II）The interlaced arrangement of coiling；The 3rd geometry subcoil
（III）With the 4th geometry subcoil（IV）Around to identical, the 3rd geometry subcoil（III）Coiling and the 4th geometry
Coil（IV）The interlaced arrangement of coiling；The second geometry subcoil（II）With the 3rd geometry subcoil（III）Around to
Conversely；The first geometry subcoil（I）With the 4th geometry subcoil（IV）It is in the same plane, the second geometry sub-line
Circle（II）With the 3rd geometry subcoil（III）It is in the same plane；The first geometry subcoil（I）The number of turn unnecessary second
Geometry subcoil（II）The number of turn；The 3rd geometry subcoil（III）The unnecessary 4th geometry subcoil of the number of turn（IV）Circle
Number.
2. the planar radio frequency coils according to claim 1 for nuclear magnetic resonance, it is characterised in that：Above radio-frequency coil
The RF magnetic field that target area is produced is parallel to radio-frequency coil surface.
3. the planar radio frequency coils according to claim 1 for nuclear magnetic resonance, it is characterised in that：The front coil
Outside is laid with shading ring（Ⅴ）.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410426363.1A CN104155622B (en) | 2014-08-26 | 2014-08-26 | A kind of planar radio frequency coils for nuclear magnetic resonance |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410426363.1A CN104155622B (en) | 2014-08-26 | 2014-08-26 | A kind of planar radio frequency coils for nuclear magnetic resonance |
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| Publication Number | Publication Date |
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| CN104155622A CN104155622A (en) | 2014-11-19 |
| CN104155622B true CN104155622B (en) | 2017-10-03 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106526512A (en) * | 2016-11-30 | 2017-03-22 | 重庆三峡学院 | Radio frequency coil capable of being used for head nuclear magnetic resonance imaging |
| CN110401995A (en) * | 2018-04-25 | 2019-11-01 | 深圳市鑫汇科股份有限公司 | A kind of electromagnetic heating apparatus |
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|---|---|---|---|---|
| EP1115005A2 (en) * | 1999-12-06 | 2001-07-11 | General Electric Company | Radio frequency coil for open magnetic resonance imaging system |
| CN1310343A (en) * | 2000-02-21 | 2001-08-29 | 通用电器横河医疗***株式会社 | RF coil and magnetic resonance imaging method and equipment |
| CN1338638A (en) * | 2000-04-26 | 2002-03-06 | Ge医疗***环球技术有限公司 | FR coil and magnetic resonance image system |
| CN1508560A (en) * | 2002-12-16 | 2004-06-30 | 中国科学院电工研究所 | C-type open MRI panel radio-frequency coil |
| CN101444421A (en) * | 2008-12-26 | 2009-06-03 | 重庆大学 | Integrated coil sensor for magnetic induction medical imaging |
| CN103744041A (en) * | 2013-12-27 | 2014-04-23 | 包头市稀宝博为医疗***有限公司 | Radio frequency coil apparatus used for magnetic resonance imaging |
| CN204044346U (en) * | 2014-08-26 | 2014-12-24 | 国家电网公司 | A kind of planar radio frequency coils for nuclear magnetic resonance |
-
2014
- 2014-08-26 CN CN201410426363.1A patent/CN104155622B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1115005A2 (en) * | 1999-12-06 | 2001-07-11 | General Electric Company | Radio frequency coil for open magnetic resonance imaging system |
| CN1310343A (en) * | 2000-02-21 | 2001-08-29 | 通用电器横河医疗***株式会社 | RF coil and magnetic resonance imaging method and equipment |
| CN1338638A (en) * | 2000-04-26 | 2002-03-06 | Ge医疗***环球技术有限公司 | FR coil and magnetic resonance image system |
| CN1508560A (en) * | 2002-12-16 | 2004-06-30 | 中国科学院电工研究所 | C-type open MRI panel radio-frequency coil |
| CN101444421A (en) * | 2008-12-26 | 2009-06-03 | 重庆大学 | Integrated coil sensor for magnetic induction medical imaging |
| CN103744041A (en) * | 2013-12-27 | 2014-04-23 | 包头市稀宝博为医疗***有限公司 | Radio frequency coil apparatus used for magnetic resonance imaging |
| CN204044346U (en) * | 2014-08-26 | 2014-12-24 | 国家电网公司 | A kind of planar radio frequency coils for nuclear magnetic resonance |
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