CN104155622A - Planar radio frequency coil for nuclear magnetic resonance - Google Patents
Planar radio frequency coil for nuclear magnetic resonance Download PDFInfo
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- CN104155622A CN104155622A CN201410426363.1A CN201410426363A CN104155622A CN 104155622 A CN104155622 A CN 104155622A CN 201410426363 A CN201410426363 A CN 201410426363A CN 104155622 A CN104155622 A CN 104155622A
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- 238000005481 NMR spectroscopy Methods 0.000 title claims abstract description 29
- 238000004804 winding Methods 0.000 abstract description 21
- 230000000694 effects Effects 0.000 description 5
- 230000003068 static effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 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
- 238000005516 engineering process Methods 0.000 description 2
- 230000002146 bilateral effect Effects 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
- 238000012544 monitoring process Methods 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000002910 structure generation Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Abstract
The invention discloses a planar radio frequency coil for nuclear magnetic resonance. The planar radio frequency coil comprises front coils and reverse coils, wherein the front coils and the reverse coils are parallel to each other and spaced in the vertical direction. The front coils comprise the coil II and the coil III. The reverse coils comprise the coil I and the coil IV. The coil II and the coil I are the same in the winding direction, the coil III and the coil IV are the same in winding direction, and the coil I and the coil III are in opposite winding directions. A winding of the geometric sub-coil I and a winding of the geometric sub-coil II are arranged in a staggered mode, and a winding of the geometric sub-coil III and a winding of the geometric sub-coil IV are arranged in a staggered mode. By the adoption of the planar radio frequency coil for nuclear magnetic resonance, compared with a general coil shaped like a positive Arabic number '8', uniformity and intensity of a radio frequency magnetic field of a target region above the planar radio frequency coil are well improved, and the quality factor of the coil is well increased.
Description
Technical field
The present invention relates to a kind of planar radio frequency coils, particularly a kind of planar radio frequency coils for nuclear magnetic resonance.
Background technology
Nuclear magnetic resonance, is, under the effect of material atom nuclear magnetic moment outside magnetic field, energy level splitting occurs, and under the effect of additional radio-frequency (RF) magnetic field, produces the physical phenomenon of energy level transition.Since the people such as nineteen forty-six American scientist Bloch, Purcell find nuclear magnetic resonance absorbing phenomenon, nuclear magnetic resonance technique has obtained unprecedented development in the field such as Wave Spectrum, medical imaging, promoted widely the progress of human society.
But, common high-field nuclear magnetic resonance equipment, such as nuclear magnetic resonance spectrometer, medical magnetic resonance imager etc., there is the inferior positions such as bulky, heavy, poor mobility, the application aspect its Site Detection at actual sample (to the real-time monitoring of patient's state of an illness) is restricted; In addition, the sample of high-field nuclear magnetic resonance equipment must be placed in can be measured in the closed magnet bore with a certain size, and this makes high-field nuclear magnetic resonance not carry out Non-Destructive Testing to the large sample with arbitrary shape.The characteristic that low-field nuclear magnetic resonance sensor is open, portable with it, can measure having the sample of arbitrary shape, has made up the deficiency of high-field nuclear magnetic resonance equipment, day by day becomes the advanced subject of nuclear magnetic resonance technique research.
In nuclear magnetic resonance, radio-frequency (RF) magnetic field is produced by radio-frequency coil.Radio-frequency coil, has the effect that excites and receive NMR signal concurrently, under radio-frequency pulse effect, trigger sample in the core generation magnetic resonance of characteristic frequency, and after trigger pulse is closed, receive the NMR signal sensing.Common low-field nuclear magnetic resonance planar radio frequency coils has planar spiral winding and figure of eight planar coil at present.Planar spiral winding is the design philosophy based on single electric current current-carrying conductor, and the radio-frequency (RF) magnetic field of generation is perpendicular to coil surface; Figure of eight planar coil is the design philosophy that flows through the current-carrying ring of inverse current based on two, and the radio-frequency (RF) magnetic field of generation is parallel to coil surface.
According to nuclear magnetic resonance principle, the radio-frequency (RF) magnetic field that radio-frequency coil produces is orthogonal with the static magnetic field that magnet structure produces in target area; Radio-frequency (RF) magnetic field will be tried one's best evenly, to excite more sample to resonate; The magnetic field intensity of radio-frequency (RF) magnetic field will be tried one's best greatly, makes the NMR signal receiving try one's best large.
Magnet structure for the static magnetic field producing perpendicular to magnet surface, radio-frequency coil is commonly used figure of eight planar coil, so that the radio-frequency (RF) magnetic field of its generation is orthogonal at the static magnetic field of target area and magnet structure generation.But common positive figure of eight planar radio frequency coils is poor at the magnetic field homogeneity of the radio-frequency (RF) magnetic field of target area generation, magnetic field intensity is less, the quality factor of coil are not high.
Summary of the invention
In view of this, the object of this invention is to provide a kind of planar radio frequency coils for nuclear magnetic resonance, above coil, the quality factor of the radio-frequency (RF) magnetic field uniformity coefficient of target area, magnetic field intensity, coil are all well improved.
The object of the invention is to realize by such technical scheme, a kind of planar radio frequency coils for nuclear magnetic resonance, comprises the front coil and the purl loop that are parallel to each other; Described front coil and purl loop have certain distance in vertical direction; Described front coil comprises the second geometry subcoil II and the 3rd how much subcoil III, and described purl loop comprises the first geometry subcoil I and the 4th how much subcoil IV; First how much subcoil I, the second geometry subcoil II, the 3rd geometry subcoil III and the 4th how much subcoil IV connect successively; Described the first how much subcoil I and second how much subcoil II around to identical, the interlaced arrangement of coiling of the coiling of described first how much subcoil I and the second geometry subcoil II; Described the 3rd how much subcoil III and the 4th how much subcoil IV around to identical, the interlaced arrangement of coiling of the coiling of the described the 3rd how much subcoil III and the 4th geometry subcoil IV; Described the second how much subcoil II and the 3rd geometry subcoil III around to contrary; Described the first geometry subcoil I and the 4th how much subcoil IV are in the same plane, and described the second geometry subcoil II and the 3rd how much subcoil III are in the same plane.
Further, the radio-frequency (RF) magnetic field that target area produces above radio-frequency coil is parallel to radio-frequency coil surface.
Further, the number of turn of the number of turn of described first how much subcoil I unnecessary second how much subcoil II; The number of turn of the number of turn the unnecessary the 4th how much subcoil IV of the described the 3rd how much subcoil III.
Further, the outside of described front coil is laid with shading ring V.
Owing to having adopted technique scheme, the present invention has advantages of as follows: the planar radio frequency coils for nuclear magnetic resonance provided by the invention, its radio-frequency (RF) magnetic field of target area above coil is compared conventionally positive " 8 "-shaped coil, and the quality factor of radio-frequency (RF) magnetic field uniformity coefficient, magnetic field intensity, coil are all well improved.
Brief description of the drawings
In order to make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, the present invention is described in further detail, wherein:
Fig. 1 is 30 ° of direction vertical views of planar radio frequency coils;
Fig. 2 is planar radio frequency coils vertical view;
The frontal line coil structures schematic diagram that Fig. 3 provides for the embodiment of the present invention;
The purl loop structural representation that Fig. 4 provides for the embodiment of the present invention;
The planar radio frequency coils upper area magnetic vector directional diagram that Fig. 5 provides for the embodiment of the present invention;
The planar radio frequency coils upper area magnetic field amplitude distribution plan that Fig. 6 provides for the embodiment of the present invention.
Embodiment
Below with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail; Should be appreciated that preferred embodiment is only for the present invention is described, instead of in order to limit the scope of the invention.
As shown in Figure 1, 2, the planar radio frequency coils for nuclear magnetic resonance provided by the invention, radio-frequency coil is bilateral structure, comprises two plane subcoils that are parallel to each other: front coil and purl loop.The described radio-frequency coil radio-frequency (RF) magnetic field that target area produces above coil is parallel to coil surface, is applicable to be used in conjunction with perpendicular to the magnet structure of magnet surface with static magnetic field.
Described front coil is identical with the shape of purl loop.Described front coil and purl loop are made up of several coils of geometry of multiple shape approximations.
Described front coil and purl loop have certain distance in vertical direction; Described front coil comprises the second geometry subcoil II and the 3rd how much subcoil III, and described purl loop comprises the first geometry subcoil I and the 4th how much subcoil IV; First how much subcoil I, the second geometry subcoil II, the 3rd geometry subcoil III and the 4th how much subcoil IV connect successively; Described the first how much subcoil I and second how much subcoil II around to identical, the interlaced arrangement of coiling of the coiling of described first how much subcoil I and the second geometry subcoil II; Described the 3rd how much subcoil III and the 4th how much subcoil IV around to identical, the interlaced arrangement of coiling of the coiling of the described the 3rd how much subcoil III and the 4th geometry subcoil IV; Described the second how much subcoil II and the 3rd geometry subcoil III around to contrary; Described the first geometry subcoil I and the 4th how much subcoil IV are in the same plane, and described the second geometry subcoil II and the 3rd how much subcoil III are in the same plane.
The number of turn of the number of turn unnecessary second how much subcoil II of described first how much subcoil I; The number of turn of the number of turn the unnecessary the 4th how much subcoil IV of the described the 3rd how much subcoil III.
The outside of described front coil is laid with shading ring V, and in practical operation, shading ring ground connection, to reduce the interference of external noise to signal.
How much subcoils of the present invention are " D " type, rectangle, square or other polygonal one, in the embodiment of the present invention, describe with " D " type coil.
In the present embodiment, the front coil of a similar circle of two " D " type coils (being coil II and coil III) composition, the purl loop of a similar circle of two " D " type coils (being coil I and coil IV) composition.
Coil II is identical with the direction of winding of coil I, and coil III is identical with the direction of winding of coil IV, and the direction of winding of coil I and coil III is contrary.The direction of winding of two coils is identical, and the radio-frequency (RF) magnetic field direction of generation is consistent, has strengthened the intensity of radio-frequency (RF) magnetic field.As explanation, taking left half of coil winding (being the winding of coil I and coil II composition) as example.If electric current enters coil from the lead-in wire of coil I, the flow direction of electric current in coil I is counterclockwise; Electric current enters coil II through the vertical leads between coil I, II, and flowing at II coil is also counterclockwise; The radio-frequency (RF) magnetic field that electric current produces at left half-coil winding is all vertical paper upwards.Electric current enters into coil III from coil II by the vertical leads between coil II, III, current direction in coil III is clockwise so, current direction in coil IV is also clockwise, like this, it is downward that the radio-frequency (RF) magnetic field producing in right half of coil winding is all vertical paper, strengthened radio-frequency (RF) magnetic field intensity.Simultaneously, the interlaced arrangement in gap of the winding of the purl loop of the winding of front coil and corresponding below, be front coil-winding below corresponding be the gap between the winding of purl loop, the wire structures that staggers like this can reduce stray capacitance and the impact of eddy effect on magnetic field, target area, radio-frequency coil top.
Fig. 3 is frontal line coil structures schematic diagram.Lay shading ring in coil outside, reduce the interference of external noise to signal.In this embodiment, the coiling live width of radio-frequency coil is 0.5mm, and distance between centers of tracks is 1.0mm, and vertical leads thickness is 0.2mm, and the overall diameter of shading ring is 40mm.
Fig. 4 is purl loop structural representation.Purl loop is different with front coil: 1) purl loop does not have shading ring; 2) purl loop is than each many 1 circles in coil left and right, front, and the radius of purl loop has more 0.75mm than the radius of the interior loop of front coil.
The planar radio frequency coils upper area magnetic vector directional diagram that Fig. 5 provides for the embodiment of the present invention.Zone line above coil, magnetic direction and coil surface collimation are better.The target area marking is apart from coil upper surface 0.6mm place, the region of 0.8mm*0.8mm*0.8mm.This planar radio frequency coils radio-frequency (RF) magnetic field that target area produces above coil is parallel to coil surface, is applicable to be used in conjunction with perpendicular to the magnet structure of magnet surface with static magnetic field.
The planar radio frequency coils upper area magnetic field amplitude distribution plan that Fig. 6 provides for the embodiment of the present invention.In target area, the homogeneity of radio-frequency (RF) magnetic field is better.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if these amendments of the present invention and within modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.
Claims (4)
1. for a planar radio frequency coils for nuclear magnetic resonance, it is characterized in that: comprise the front coil and the purl loop that are parallel to each other; Described front coil and purl loop have certain distance in vertical direction; Described front coil comprises second how much subcoils (II) and the 3rd how much subcoils (III), and described purl loop comprises first how much subcoils (I) and the 4th how much subcoils (IV); First how much subcoils (I), second how much subcoils (II), the 3rd how much subcoils (III) and the 4th how much subcoils (IV) are connected successively; Described the first how much subcoils (I) and second how much subcoils (II) around to identical, the interlaced arrangement of coiling of the coiling of described first how much subcoils (I) and the second geometry subcoils (II); Described the 3rd how much subcoils (III) and the 4th how much subcoils (IV) around to identical, the interlaced arrangement of coiling of the coiling of the described the 3rd how much subcoils (III) and the 4th geometry subcoils (IV); Described the second how much subcoils (II) and the 3rd geometry subcoils (III) around to contrary; Described first how much subcoils (I) are in the same plane with the 4th how much subcoils (IV), and described second how much subcoils (II) are in the same plane with the 3rd how much subcoils (III).
2. the planar radio frequency coils for nuclear magnetic resonance according to claim 1, is characterized in that: the radio-frequency (RF) magnetic field that target area produces above radio-frequency coil is parallel to radio-frequency coil surface.
3. the planar radio frequency coils for nuclear magnetic resonance according to claim 1, is characterized in that: the number of turn of the number of turn unnecessary second how much subcoils (II) of described first how much subcoils (I); The number of turn of the number of turn the unnecessary the 4th how much subcoils (IV) of the described the 3rd how much subcoils (III).
4. the planar radio frequency coils for nuclear magnetic resonance according to claim 1, is characterized in that: the outside of described front coil is laid with shading ring (V).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
|---|---|---|---|
| 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 true CN104155622A (en) | 2014-11-19 |
| CN104155622B CN104155622B (en) | 2017-10-03 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6437567B1 (en) * | 1999-12-06 | 2002-08-20 | General Electric Company | Radio frequency coil for open magnetic resonance imaging system |
| CN1201165C (en) * | 2000-02-21 | 2005-05-11 | 通用电器横河医疗系统株式会社 | RF coil and magnetic resonance imaging method and equipment |
| JP3705996B2 (en) * | 2000-04-26 | 2005-10-12 | ジーイー・メディカル・システムズ・グローバル・テクノロジー・カンパニー・エルエルシー | Magnetic resonance imaging device |
| CN1258683C (en) * | 2002-12-16 | 2006-06-07 | 中国科学院电工研究所 | C-type open MRI panel radio-frequency coil |
| CN101444421B (en) * | 2008-12-26 | 2010-11-17 | 重庆大学 | Integrated coil sensor for magnetic induction medical imaging |
| CN103744041B (en) * | 2013-12-27 | 2017-01-04 | 包头市稀宝博为医疗系统有限公司 | A kind of coil device being applied to nuclear magnetic resonance |
| 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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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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| CN104155622B (en) | 2017-10-03 |
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