CN102749598A - Magnetic resonance radio frequency coil based on fractal alternating impedance micro-strip - Google Patents

Magnetic resonance radio frequency coil based on fractal alternating impedance micro-strip Download PDF

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CN102749598A
CN102749598A CN2012102659033A CN201210265903A CN102749598A CN 102749598 A CN102749598 A CN 102749598A CN 2012102659033 A CN2012102659033 A CN 2012102659033A CN 201210265903 A CN201210265903 A CN 201210265903A CN 102749598 A CN102749598 A CN 102749598A
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fractal
alternately
koch
frequency coil
magnetic resonance
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CN102749598B (en
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徐文龙
陶贵生
张鞠成
徐冰俏
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China Jiliang University
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Abstract

The invention discloses a magnetic resonance radio frequency coil based on a fractal alternating impedance micro-strip. The magnetic resonance radio frequency coil is made of the micro-strip, wherein the micro-strip comprises a dielectric substrate (1), an earth plate and metal sheets (2), the earth plate is arranged on the backside of the dielectric substrate (1), the metal sheets (2) are arranged on the front side of the dielectric substrate (1) alternately in a wide and narrow manner, and the wide side (2.1) is formed from Koch fractal. According to the structure disclosed by the invention, the coil is designed into the shape alternative in high and low impedances in axial direction of the long axis of the micro-strip, so that the magnetic field of the coil in the axial direction of the long axis become more uniform, and the magnetic field is further improved in uniformity on the basis of the Koch fractal upon the wide side, so that the magnetic resonance imaging is facilitated, the image definition is improved and the diagnostic efficiency and the accuracy are improved.

Description

Based on the fractal alternately magnetic resonance radio-frequency coil of impedance microstrip line
Technical field
The present invention relates to magnetic resonance arts, is a kind of based on the fractal alternately magnetic resonance radio-frequency coil of impedance microstrip line specifically.
Background technology
Resonance is a kind of specific physical phenomenon, produces magnetic resonance in order to make the material under the external magnetic field effect, needs certain RF excited usually, and promptly RF excited is the condition that produces the magnetic resonance phenomenon.Common clinically MRI is the distribution situation that shows contained protons such as human tissue organ.In order accurately to obtain the position in space, proton place, three orthogonal linear gradient magnetic fields of stack on the constant main field of being everlasting, the result of stack makes the magnetic field intensity of space each point have nothing in common with each other, so the Rameau frequency of space each point also has nothing in common with each other.Therefore, can adopt the Rameau frequency of diverse location proton to come the locus of mark various points.Magnetic resonance imaging (MRI) technology is a kind of important medical imaging diagnosis method; Because it has the many and no ionising radiation characteristic of imaging parameters; Be widely used in medicine clinical research and diagnosis now, greatly promoted the development of Neuscience, physiology and Medical Imaging.But the radiofrequency signal that MR imaging apparatus collects is very faint, very easily receives the interference of outside noise, and therefore improving signal noise ratio (snr) of image (SNR) is the top priority of magnetic resonance imaging.Radio-frequency coil is one of determinative of signal to noise ratio (S/N ratio) as signal receiving sensor, is an active focus of MRI investigation field always.
The magnetic resonance radio-frequency coil is normally formed by basic conductor element (as: copper sheet) coiling, both can play the effect of excite radiofrequency signal, also can play the effect of receiving magnetic resonance signals, is one of core component of magnetic resonance system.Microstrip array is simple in structure with it, be easy to make, volume is little, cost is low, be applied to the design of magnetic resonance radio-frequency coil easily with advantage such as conformal is installed, and its feeding network can be integrated on the same medium substrate with the microstrip array unit well.Microstrip line circle commonly used is on a thin-medium substrate (pressing layer like the teflon spun glass); One side is enclosed thin metal layer as ground plate; Another side is made the metal patch of definite shape with methods such as photoetching corrosions and is constituted; It utilizes microstrip line or coaxial cable probe to the paster feed, between conductor patch and ground plate, has encouraged radio frequency electromagnetic field.According to the needs of magnetic resonance imaging occasion, microstrip line is processed different shapes, thereby design corresponding magnetic resonance radio-frequency coil, like birdcage radio frequency coil, taper radio-frequency coil etc.
The radio frequency coil arrays of being made by microstrip line generally is used for the emission and the reception of magnetic resonance signal, and through amplitude and the phase place of controlling each passage, this coil can be used for the parallel emission and the reception of magnetic resonance signal effectively.Producing uniform RF magnetic field at imaging region is one of radio frequency coil designs sixty-four dollar question, moreover, will try one's best evenly along the intensity of the major axis axial magnetic field of radio-frequency coil.The radio-frequency coil that is used for emitting radio frequency signal must operate at corresponding Larmor frequency, and will produce uniform magnetic field in region of interest, makes atomic energy access uniformly and excites.The radio-frequency coil that is used for received RF signal must be sentenced identical gain received RF signal in the arbitrfary point of region of interest.This is the basic demand of the radio-frequency coil of magnetic resonance.The traditional microstrip line radio-frequency coil that is used for magnetic resonance imaging discovers that magnetic field reaches maximal value at the center on this direction in magnetic field that its major axis produces on axially and inhomogeneous, and minimum at the two ends of coil.And because magnetic field is even inadequately, the MRI sharpness that then produces is not high, thus the influence diagnosis.
Summary of the invention
The technical matters that the present invention will solve is, provide a kind of and can produce the good electric field of uniform magnetic field and continuity, obtain accurate MRI based on the fractal alternately magnetic resonance radio-frequency coil of impedance microstrip line.
Technical solution of the present invention is; A kind of magnetic resonance radio-frequency coil based on fractal alternately impedance microstrip line of following structure is provided, and described magnetic resonance radio-frequency coil is processed by microstrip line, and described microstrip line comprises medium substrate, ground plate and metal patch; Described ground plate is located at the back side of medium substrate; Metal patch is located at the front of medium substrate, and described metal patch is width alternately arranges, broadside be shaped as that Koch is fractal to form.
Adopt above structure; The present invention compared with prior art has the following advantages: adopt structure of the present invention, the resistance of the impedance merchandiser bit length of microstrip line is relevant, therefore; Through changing the width of traditional microstrip line; The impedance meeting of coil changes, thereby forms alternately impedance, and then can cause that microstrip line produces the variation in magnetic field; On the microstrip line major axis is axial, coil is made as the shape that high Low ESR replaces; The magnetic field of coil on its major axis is axial can become more even; Further improved uniformity of magnetic field, thereby helped magnetic resonance imaging on the fractal basis of Koch in that the broadside place is carried out; Guarantee the sharpness of image, improved diagnosis efficiency and accuracy.
As improvement, described metal patch width is alternately arranged and is meant by two sections broadsides and one section narrow limit and alternately arranges, and described Koch is fractal to be that single order Koch is fractal.Three sections designs combine the fractal uniformity of magnetic field that not only improved of single order Koch, also are convenient to emulation and number adjustment simultaneously.
As improvement, described metal patch width is alternately arranged and is meant by two sections broadsides and one section narrow limit and alternately arranges, and described Koch is fractal to be that second order Koch is fractal.Second order Koch is fractal to be fractal once more on the fractal basis of single order, has played the fractal effect that is optimized of single order.
As improvement, described metal patch width is alternately arranged and is meant by three sections broadsides and two sections narrow limits and alternately arranges, and described Koch is fractal to be that single order Koch is fractal.
As improvement, described metal patch width is alternately arranged and is meant by three sections broadsides and two sections narrow limits and alternately arranges, and described Koch is fractal to be that second order Koch is fractal.
As improvement, the width of described broadside is four times of narrow limit, in order further five sections fractal alternately performances of impedance to be promoted, so be provided with preferable width limit ratio.
As improvement, the width on described broadside and narrow limit is respectively 20mm and 5mm.
As improvement, the width on described broadside and narrow limit is respectively 20mm and 2mm.
As improvement, described metal patch width is alternately arranged and is meant by four sections broadsides and three sections narrow limits and alternately arranges, and described Koch is fractal to be that single order Koch is fractal.
As improvement, described metal patch width is alternately arranged and is meant by four sections broadsides and three sections narrow limits and alternately arranges, and described Koch is fractal to be that second order Koch is fractal.
Description of drawings
Fig. 1 is for inventing based on the fractal alternately structural representation (embodiment 1) of the magnetic resonance radio-frequency coil of impedance microstrip line.
Fig. 2 is for inventing based on the fractal alternately structural representation (embodiment 2) of the magnetic resonance radio-frequency coil of impedance microstrip line.
Fig. 3 is for inventing based on the fractal alternately structural representation (embodiment 3) of the magnetic resonance radio-frequency coil of impedance microstrip line.
Fig. 4 is for inventing based on the fractal alternately structural representation (embodiment 4) of the magnetic resonance radio-frequency coil of impedance microstrip line.
Fig. 5 is for inventing based on the fractal alternately structural representation (embodiment 5) of the magnetic resonance radio-frequency coil of impedance microstrip line.
Fig. 6 is for inventing based on the fractal alternately structural representation (embodiment 6) of the magnetic resonance radio-frequency coil of impedance microstrip line.
Fig. 7 is the interior Distribution of Magnetic Field figure of FOV of embodiment 3.
Fig. 8 is the interior Distribution of Magnetic Field figure of FOV of embodiment 4.
Fig. 9 is the synoptic diagram of Koch fractal curve unit.
As shown in the figure 1, medium substrate, 2, metal patch, 2.1, broadside, 2.2, narrow limit.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is described further.
As shown in the figure; Of the present invention described magnetic resonance radio-frequency coil is processed by microstrip line based on the fractal alternately magnetic resonance radio-frequency coil of impedance microstrip line, and described microstrip line comprises medium substrate 1, ground plate and metal patch 2; Described ground plate is located at the back side of medium substrate 1; Metal patch 2 is located at the front of medium substrate 1, and described metal patch 2 is width alternately arranges, broadside 2.1 be shaped as that Koch is fractal to form.
Embodiment 1 is the fractal alternately designs of impedance of three sections single order Koch, and is as shown in Figure 1, and described metal patch width is alternately arranged and is meant by two sections broadsides and one section narrow limit and alternately arranges, and described Koch is fractal to be that single order Koch is fractal.
Embodiment 2 is the fractal alternately designs of impedance of three sections second order Koch, and is as shown in Figure 2, and described metal patch width is alternately arranged and is meant by two sections broadsides and one section narrow limit and alternately arranges, and described Koch is fractal to be that second order Koch is fractal.
Embodiment 3 is the fractal alternately designs of impedance of five sections single order Koch, and is as shown in Figure 3, and described metal patch width is alternately arranged and is meant by three sections broadsides and two sections narrow limits and alternately arranges, and described Koch is fractal to be that single order Koch is fractal; The width of described broadside is four times of narrow limit, provides following numerical value here and specifies.The width on broadside and narrow limit is respectively 20mm and 5mm, and length is respectively 20mm and 25mm; The fractal alternately impedance microstrip line radio-frequency coil of single order Koch replaces replacing three sections broadsides in the impedance microstrip line radio-frequency coil with different being of fractal alternately impedance microstrip line radio-frequency coil with single order Koch fractal curve.
Embodiment 4 is the fractal alternately designs of impedance of five sections second order Koch, and is as shown in Figure 4, and described metal patch width is alternately arranged and is meant by three sections broadsides and two sections narrow limits and alternately arranges, and described Koch is fractal to be that second order Koch is fractal; The fractal alternately impedance microstrip line radio-frequency coil of second order Koch replaces replacing three sections broadsides in the impedance microstrip line radio-frequency coil with different being of fractal alternately impedance microstrip line radio-frequency coil with second order Koch fractal curve.Continue to use the numerical value of embodiment 3 among the embodiment 4,, change narrow limit into 2mm just according to actual effect.
The parameter that specifies and compare wherein below in conjunction with embodiment 3,4; Table 1 is depicted as the magnetic field of four coil formers in region of interest (FOV) and the peak value and the average of Electric Field Distribution; FOV refers to the rectangular area of coil top, and length is identical with microstrip line length, is made as 110mm here; Width is 100mm; Z is the distance that arrives microstrip line in the FOV; It is thus clear that alternately the magnetic field average of impedance microstrip line radio-frequency coil than the raising of traditional microstrip line radio-frequency coil 169%, the fractal magnetic field average with the fractal alternately impedance microstrip line radio-frequency coil of second order of single order has improved 30% and 150% respectively than traditional microstrip line radio-frequency coil.
The peak value and the average of B1 field and electric field in each model FOV of table 1
Figure BSA00000756159000041
Table 2 is depicted as each model respectively in the homogeneity of five level line place Distribution of Magnetic Field; The Distribution of Magnetic Field of impedance microstrip line radio-frequency coil poor than traditional microstrip line radio-frequency coil of Distribution of Magnetic Field homogeneity when Z＜30mm alternately; This is that high Low ESR joint changes of magnetic field acutely causes owing to the corresponding magnetic field peak value apart from each others in two arrowbands.Distribution of Magnetic Field homogeneity in the fractal alternately impedance microstrip line radio-frequency coil FOV is compared alternately, and impedance microstrip line radio-frequency coil and traditional microstrip line radio-frequency coil all have raising; With z=15mm is example, and single order is fractal to have improved 17% and 21% than the homogeneity that replaces impedance microstrip line radio-frequency coil respectively with the fractal alternately impedance microstrip line radio-frequency coil of second order.With z=30mm is example, and single order is fractal to have improved 10% and 15% than the homogeneity of traditional microstrip line coil respectively with the fractal alternately impedance microstrip line radio-frequency coil of second order.The more little expression Distribution of Magnetic Field of numerical value homogeneity might as well in the table 2.
Each model of table 2 is in the Distribution of Magnetic Field homogeneity at five level line places
(Bmax-Bmm)/Bmean?Z 5mm 10mm 15mm 20mm 30mm
The surface current density of tradition microstrip line radio-frequency coil, the fractal alternately impedance microstrip line radio-frequency coil of single order and the fractal alternately impedance microstrip line radio-frequency coil of second order distributes; The electric current distribution uncontinuity that fractal alternately impedance line microstrip line coil is alternately located at its high Low ESR is greatly improved, and the Distribution of Magnetic Field in the coil FOV is more even; The fractal coil of second order Koch is compared the fractal coil of single order Koch not only in the alternately current continuity improvement at place of high Low ESR, and continuity is better in the edge of fractal shape, thereby Distribution of Magnetic Field is more even.
Embodiment 5 is the fractal alternately designs of impedance of seven sections single order Koch, and is as shown in Figure 5, and described metal patch width is alternately arranged and is meant by four sections broadsides and three sections narrow limits and alternately arranges, and described Koch is fractal to be that single order Koch is fractal.
Embodiment 6 is the fractal alternately designs of impedance of seven sections second order Koch, and is as shown in Figure 6, and described metal patch width is alternately arranged and is meant by four sections broadsides and three sections narrow limits and alternately arranges, and described Koch is fractal to be that second order Koch is fractal.
Single order shown in the embodiment, second order Koch is fractal is the basis with the curve among Fig. 9; Every straight-line segment of impedance broadside is alternately replaced obtaining the Koch curve of an iteration (single order) with curve shown in Figure 9, and every straight-line segment with single order Koch in fractal can obtain the Koch curve of second iteration (second order) with the replacement of Koch fractal curve.
As shown in Figure 9, consideration is produced the process of first figure (6 points) by straight-line segment (2 points).If P 1And P 6Be respectively two end points of original straight-line segment, need insert four some P in the centre of straight-line segment successively at present 2, P 3, P 4, P 5Obvious P 2, P 3Be positioned at line segment 1/3rd places, P 4, P 5Be positioned at line segment 2/3rds places, P 4The position of point can be regarded as by P 5Point is with P 2Point is for the axle center, is rotated counterclockwise 90 degree and gets.Rotation is by orthogonal matrix
A = cos ( π 2 ) - sin ( π 2 ) sin ( π 2 ) cos ( π 2 )
Realize.
Algorithm is according to primary data (P 1And P 6The coordinate of point), produce the coordinate of six nodes among Fig. 9.The coordinate array of node forms one 6 * 2 matrix P, the first behavior P of matrix 1Coordinate, the second behavior P 2Coordinate ..., the 6th behavior P 6Coordinate.First column element of matrix is respectively the x coordinate of six nodes, and the secondary series element is respectively the y coordinate of six nodes.Further consider nodal point number purpose Changing Pattern in the Koch curve forming process.If the nodal point number of the k time iteration generation is n k, the nodal point number of the k+1 time iteration generation is n K+1, n then kAnd n K+1Middle recurrence relation is n K+1=5n k-4.
Among the above embodiment; Fractal with single order, second order Koch is that example has been introduced the Koch fractal alternately structure and the application of impedance; It should be noted that order what with the uniformity coefficient in magnetic field be not one be decided to be positive correlation or negative correlation relation; But, fractal except single order, second order Koch, also exist other orders can satisfy the fractal of the application's condition.
Below only be described, but can not be interpreted as it is restriction claim with regard to preferred embodiment of the present invention.The present invention not only is confined to above embodiment, and its concrete structure allows variation, like fractal single order, the second order of being not limited to of Koch, comprises that also other are multistage fractal, or the like.In a word, all various variations of in the protection domain of independent claims of the present invention, being done are all in protection scope of the present invention.
Tradition microstrip line radio-frequency coil 1372 1345 1253 1217 1121
The fractal alternately impedance microstrip line radio-frequency coil of single order 1.399 1277 1.208 1.192 1.006
The fractal alternately impedance microstrip line radio-frequency coil of second order 1332 1342 1.145 1.099 0949

Claims (10)

1. magnetic resonance radio-frequency coil based on fractal alternately impedance microstrip line; Described magnetic resonance radio-frequency coil is processed by microstrip line; It is characterized in that: described microstrip line comprises medium substrate (1), ground plate and metal patch (2), and described ground plate is located at the back side of medium substrate (1), and metal patch (2) is located at the front of medium substrate (1); Described metal patch (2) is width alternately arranges, broadside (2.1) be shaped as that Koch is fractal to form.
2. according to claim 1 based on the fractal alternately magnetic resonance radio-frequency coil of impedance microstrip line; It is characterized in that: described metal patch width is alternately arranged and is meant by two sections broadsides (2.1) and one section narrow limit (2.2) and alternately arranges, and described Koch is fractal to be that single order Koch is fractal.
3. according to claim 1 based on the fractal alternately magnetic resonance radio-frequency coil of impedance microstrip line; It is characterized in that: described metal patch width is alternately arranged and is meant by two sections broadsides (2.1) and one section narrow limit (2.2) and alternately arranges, and described Koch is fractal to be that second order Koch is fractal.
4. according to claim 1 based on the fractal alternately magnetic resonance radio-frequency coil of impedance microstrip line; It is characterized in that: described metal patch width is alternately arranged and is meant by three sections broadsides (2.1) and two sections narrow limits (2.2) and alternately arranges, and described Koch is fractal to be that single order Koch is fractal.
5. according to claim 1 based on the fractal alternately magnetic resonance radio-frequency coil of impedance microstrip line; It is characterized in that: described metal patch width is alternately arranged and is meant by three sections broadsides (2.1) and two sections narrow limits (2.2) and alternately arranges, and described Koch is fractal to be that second order Koch is fractal.
6. according to claim 1 based on the fractal alternately magnetic resonance radio-frequency coil of impedance microstrip line; It is characterized in that: described metal patch width is alternately arranged and is meant by four sections broadsides (2.1) and three sections narrow limits (2.2) and alternately arranges, and described Koch is fractal to be that single order Koch is fractal.
7. according to claim 1 based on the fractal alternately magnetic resonance radio-frequency coil of impedance microstrip line; It is characterized in that: described metal patch width is alternately arranged and is meant by four sections broadsides (2.1) and three sections narrow limits (2.2) and alternately arranges, and described Koch is fractal to be that second order Koch is fractal.
8. according to claim 2 or 3 described magnetic resonance radio-frequency coils based on fractal alternately impedance microstrip line, it is characterized in that: the width of described broadside (2.1) is four times of narrow limit (2.2).
9. according to claim 2 based on the fractal alternately magnetic resonance radio-frequency coil of impedance microstrip line, it is characterized in that: the width of described broadside (2.1) and narrow limit (2.2) is respectively 20mm and 5mm.
10. according to claim 3 based on the fractal alternately magnetic resonance radio-frequency coil of impedance microstrip line, it is characterized in that: the width of described broadside (2.1) and narrow limit (2.2) is respectively 20mm and 2mm.
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CN107064839A (en) * 2017-04-19 2017-08-18 合肥工业大学 A kind of magnetic resonance imaging radiofrequency coil that left/right hand microstrip line is combined based on point shape

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