CN204044346U - 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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- CN204044346U CN204044346U CN201420486331.6U CN201420486331U CN204044346U CN 204044346 U CN204044346 U CN 204044346U CN 201420486331 U CN201420486331 U CN 201420486331U CN 204044346 U CN204044346 U CN 204044346U
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- 238000005481 NMR spectroscopy Methods 0.000 title claims abstract description 29
- 238000004804 winding Methods 0.000 abstract description 17
- 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
- 238000010521 absorption reaction Methods 0.000 description 1
- 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
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Abstract
The utility model discloses a kind of planar radio frequency coils for nuclear magnetic resonance, be included in vertical direction and there is certain distance and the front coil be parallel to each other and purl loop.Described front coil comprises coil II, III, and described purl loop comprises coil I, IV, and 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 coiling of described first geometry subcoil I and the interlaced arrangement of coiling of the second geometry subcoil II, the coiling of described 3rd geometry subcoil III and the interlaced arrangement of coiling of the 4th geometry subcoil IV.The planar radio frequency coils for nuclear magnetic resonance that the utility model provides, its radio-frequency (RF) magnetic field of target area above coil compares usually positive " 8 "-shaped coil, and the quality factor of radio-frequency (RF) magnetic field uniformity coefficient, magnetic field intensity, coil are all well improved.
Description
Technical field
The utility model 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 produces the physical phenomenon of energy level transition under the effect of external RF field.Since from nineteen forty-six, the people such as American scientist Bloch, Purcell finds nuclear magnetic resonance absorption phenomenon, nuclear magnetic resonance technique obtains unprecedented development in the field such as Wave Spectrum, medical imaging, promoted the progress of human society widely.
But, common high-field nuclear magnetic resonance equipment, such as nuclear magnetic resonance spectrometer, medical magnetic resonance imager etc., have the inferior positions such as bulky, heavy, poor mobility, the application in its Site Detection at actual sample (the real-time monitoring to patient's state of an illness) be restricted; In addition, the sample of high-field nuclear magnetic resonance equipment must be placed in there is a certain size closed magnet chamber in can be measured, this makes high-field nuclear magnetic resonance can 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 the sample with arbitrary shape, compensate for 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 exciting and receive NMR signal concurrently, under radio-frequency pulse effect, namely trigger the core generation magnetic resonance of characteristic frequency in sample, and receives in trigger pulse closedown the NMR signal sensed afterwards.Low-field nuclear magnetic resonance planar radio frequency coils common at present has planar spiral winding and figure of eight planar coil.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 of the current-carrying ring flowing through 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, resonates to excite more sample; The magnetic field intensity of radio-frequency (RF) magnetic field will be tried one's best greatly, the NMR signal received is tried one's best large.
For the magnet structure of the static magnetic field produced perpendicular to magnet surface, radio-frequency coil commonly uses figure of eight planar coil, and the radio-frequency (RF) magnetic field produced to make it is orthogonal with the static magnetic field that magnet structure produces in target area.But the magnetic field homogeneity of the radio-frequency (RF) magnetic field that common positive figure of eight planar radio frequency coils produces in target area is poor, magnetic field intensity is less, the quality factor of coil are not high.
Utility model content
In view of this, the purpose of this utility model is to provide a kind of planar radio frequency coils for nuclear magnetic resonance, and 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 purpose of this utility model is realized by such technical scheme, and a kind of planar radio frequency coils for nuclear magnetic resonance, comprises the front coil and 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 geometry subcoil III, and described purl loop comprises 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 connect successively; Described first geometry subcoil I and the second geometry subcoil II around to identical, the coiling of described first geometry subcoil I and the interlaced arrangement of coiling of the second geometry subcoil II; Described 3rd geometry subcoil III and the 4th geometry subcoil IV around to identical, the coiling of described 3rd geometry subcoil III and the interlaced arrangement of coiling of the 4th geometry subcoil IV; Described second geometry subcoil II and the 3rd geometry subcoil III around to contrary; Described first geometry subcoil I and the 4th geometry subcoil IV is in the same plane, and described second geometry subcoil II and the 3rd geometry subcoil III is 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 unnecessary second geometry subcoil II of the number of turn of described first geometry subcoil I; The number of turn of the unnecessary 4th geometry subcoil IV of the number of turn of described 3rd geometry subcoil III.
Further, the outside of described front coil is laid with shading ring V.
Owing to have employed technique scheme, the utility model has following advantage: the planar radio frequency coils for nuclear magnetic resonance that the utility model provides, its radio-frequency (RF) magnetic field of target area above coil compares usually positive " 8 "-shaped coil, and the quality factor of radio-frequency (RF) magnetic field uniformity coefficient, magnetic field intensity, coil are all well improved.
Accompanying drawing explanation
In order to make the purpose of this utility model, technical scheme and advantage clearly, below in conjunction with accompanying drawing, the utility model is described in further detail, wherein:
Fig. 1 is planar radio frequency coils 30o direction vertical view;
Fig. 2 is planar radio frequency coils vertical view;
The frontal line coil structures schematic diagram that Fig. 3 provides for the utility model embodiment;
The purl loop structural representation that Fig. 4 provides for the utility model embodiment;
The planar radio frequency coils upper area magnetic vector directional diagram that Fig. 5 provides for the utility model embodiment;
The planar radio frequency coils upper area magnetic field amplitude distribution plan that Fig. 6 provides for the utility model embodiment.
Embodiment
Below with reference to accompanying drawing, preferred embodiment of the present utility model is described in detail; Should be appreciated that preferred embodiment only in order to the utility model is described, instead of in order to limit protection domain of the present utility model.
As shown in Figure 1, 2, the planar radio frequency coils for nuclear magnetic resonance that the utility model provides, radio-frequency coil is bilateral structure, comprises two flat sub-coils be parallel to each other: front coil and purl loop.Described radio-frequency coil above coil target area produce radio-frequency (RF) magnetic field be parallel to coil surface, be applicable to static magnetic field perpendicular to magnet surface magnet structure with the use of.
Described front coil is identical with the shape of purl loop.Described front coil and purl loop are made up of a few coil of the geometry of multiple shape approximation.
Described front coil and purl loop have certain distance in vertical direction; Described front coil comprises the second geometry subcoil II and the 3rd geometry subcoil III, and described purl loop comprises 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 connect successively; Described first geometry subcoil I and the second geometry subcoil II around to identical, the coiling of described first geometry subcoil I and the interlaced arrangement of coiling of the second geometry subcoil II; Described 3rd geometry subcoil III and the 4th geometry subcoil IV around to identical, the coiling of described 3rd geometry subcoil III and the interlaced arrangement of coiling of the 4th geometry subcoil IV; Described second geometry subcoil II and the 3rd geometry subcoil III around to contrary; Described first geometry subcoil I and the 4th geometry subcoil IV is in the same plane, and described second geometry subcoil II and the 3rd geometry subcoil III is in the same plane.
The number of turn of the unnecessary second geometry subcoil II of the number of turn of described first geometry subcoil I; The number of turn of the unnecessary 4th geometry subcoil IV of the number of turn of described 3rd geometry 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.
Geometry subcoil described in the utility model is " D " type, rectangle, square or other polygonal one, is described in the utility model embodiment with " D " type coil.
In the present embodiment, two " D " type coils (i.e. coil II and coil III) form the front coil of a similar circle, and two " D " type coils (i.e. coil I and coil IV) form the purl loop of a similar circle.
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, enhances the intensity of radio-frequency (RF) magnetic field.As explanation, for left half of coil winding (i.e. the winding of coil I and coil II composition).If electric current enters coil from the lead-in wire of coil I, the flow direction of electric current in coil I is counterclockwise; The vertical leads of electric current through between coil I, II enters coil II, and flowing at No. 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 so in coil III is clockwise, current direction in coil IV is also clockwise, like this, it is downward that the radio-frequency (RF) magnetic field produced in right half of coil winding is all vertical paper, enhances radio-frequency (RF) magnetic field intensity.Simultaneously, the interlaced arrangement in gap of the winding of the winding of front coil and the purl loop of corresponding below, namely the gap below the coil-winding of front between the corresponding winding being purl loop, the wire structures that staggers like this can reduce the impact in magnetic field, target area above stray capacitance and eddy effect radio frequency coil.
Fig. 3 is frontal line coil structures schematic diagram.Outside coil, lay shading ring, reduce external noise to the interference of 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 and front coil unlike: 1) purl loop does not have shading ring; 2) purl loop many 1 circle more each than coil left and right, front, namely 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 utility model embodiment.Zone line above coil, magnetic direction and coil surface collimation better.The target area marked is distance coil upper surface 0.6mm place, the region of 0.8mm*0.8mm*0.8mm.This planar radio frequency coils above coil target area produce radio-frequency (RF) magnetic field be parallel to coil surface, be applicable to static magnetic field perpendicular to magnet surface magnet structure with the use of.
The planar radio frequency coils upper area magnetic field amplitude distribution plan that Fig. 6 provides for the utility model embodiment.In target area, the homogeneity of radio-frequency (RF) magnetic field is better.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, obviously, those skilled in the art can carry out various change and modification to the utility model and not depart from spirit and scope of the present utility model.Like this, if these amendments of the present utility model and modification belong within the scope of the utility model claim and equivalent technologies thereof, then the utility model is also intended to comprise these change and modification.
Claims (4)
1. for a planar radio frequency coils for nuclear magnetic resonance, it is characterized in that: comprise the front coil and 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 geometry subcoil (III), and described purl loop comprises 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) are connected successively; Described first geometry subcoil (I) and the second geometry subcoil (II) around to identical, the coiling of described first geometry subcoil (I) and the interlaced arrangement of coiling of the second geometry subcoil (II); Described 3rd geometry subcoil (III) and the 4th geometry subcoil (IV) around to identical, the coiling of described 3rd geometry subcoil (III) and the interlaced arrangement of coiling of the 4th geometry subcoil (IV); Described second geometry subcoil (II) and the 3rd geometry subcoil (III) around to contrary; Described first geometry subcoil (I) is in the same plane with the 4th geometry subcoil (IV), and described second geometry subcoil (II) is in the same plane with the 3rd geometry subcoil (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 unnecessary second geometry subcoil (II) of the number of turn of described first geometry subcoil (I); The number of turn of the unnecessary 4th geometry subcoil (IV) of the number of turn of described 3rd geometry subcoil (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 |
|---|---|---|---|
| CN201420486331.6U CN204044346U (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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| CN201420486331.6U CN204044346U (en) | 2014-08-26 | 2014-08-26 | A kind of planar radio frequency coils for nuclear magnetic resonance |
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| CN204044346U true CN204044346U (en) | 2014-12-24 |
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| CN201420486331.6U Withdrawn - After Issue CN204044346U (en) | 2014-08-26 | 2014-08-26 | 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 |
|---|---|---|---|---|
| CN106711617A (en) * | 2017-02-24 | 2017-05-24 | 华南理工大学 | Plane lens for focusing and amplifying near magnetic field through adoption of magnet ring dipole |
| CN104155622B (en) * | 2014-08-26 | 2017-10-03 | 国家电网公司 | A kind of planar radio frequency coils for nuclear magnetic resonance |
-
2014
- 2014-08-26 CN CN201420486331.6U patent/CN204044346U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104155622B (en) * | 2014-08-26 | 2017-10-03 | 国家电网公司 | A kind of planar radio frequency coils for nuclear magnetic resonance |
| CN106711617A (en) * | 2017-02-24 | 2017-05-24 | 华南理工大学 | Plane lens for focusing and amplifying near magnetic field through adoption of magnet ring dipole |
| CN106711617B (en) * | 2017-02-24 | 2023-08-22 | 华南理工大学 | Plane lens for focusing and amplifying near magnetic field by utilizing magnetic ring dipole |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20141224 Effective date of abandoning: 20171003 |