KR101690428B1 - Multi-channel RF coil array for magnetic resonance imaging - Google Patents

Multi-channel RF coil array for magnetic resonance imaging Download PDF

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KR101690428B1
KR101690428B1 KR1020150138985A KR20150138985A KR101690428B1 KR 101690428 B1 KR101690428 B1 KR 101690428B1 KR 1020150138985 A KR1020150138985 A KR 1020150138985A KR 20150138985 A KR20150138985 A KR 20150138985A KR 101690428 B1 KR101690428 B1 KR 101690428B1
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South Korea
Prior art keywords
coil
array
coil array
mri
plane
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KR1020150138985A
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Korean (ko)
Inventor
서증훈
한상덕
김경남
류연철
정준영
Original Assignee
(의료)길의료재단
가천대학교 산학협력단
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Priority to KR1020150138985A priority Critical patent/KR101690428B1/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
    • G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
    • G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
    • G01R33/34007—Manufacture of RF coils, e.g. using printed circuit board technology; additional hardware for providing mechanical support to the RF coil assembly or to part thereof, e.g. a support for moving the coil assembly relative to the remainder of the MR system
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
    • G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
    • G01R33/341—Constructional details, e.g. resonators, specially adapted to MR comprising surface coils
    • G01R33/3415—Constructional details, e.g. resonators, specially adapted to MR comprising surface coils comprising arrays of sub-coils, i.e. phased-array coils with flexible receiver channels
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
    • G01R33/36—Electrical details, e.g. matching or coupling of the coil to the receiver

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  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)

Abstract

A multi-channel RF coil array for MRI is disclosed. The present invention relates to an multi-channel RF coil array for MRI which is arranged in a circle to surround an object to be examined. At least one RF coil element among a plurality of RF coil elements constituting the multi-channel RF coil array includes first and second coil portions disposed on a first plane and facing each other; and third and fourth coil portions respectively disposed on the second and third planes perpendicular to the first plane and connecting the first and second coil portions at a facing position. Each of the third and fourth coil portions are maximally spaced apart from the first plane at a central point.

Description

Multi-channel RF coil array for magnetic resonance imaging (MRI)

[0001] The present invention relates to a multichannel RF coil array for MRI, and more particularly, to a multichannel RF coil array for MRI having a form in which the uniformity of a transmitting / receiving field can be improved as compared with the conventional one.

As is widely known, magnetic resonance imaging (MRI) refers to a technique of applying a high frequency to a subject placed in a magnetic field and reconstructing a magnetic resonance signal from the subject by a computer and imaging the same.

MRI is not harmful to the human body because it does not use radiation like X-ray. It can shoot three-dimensional images, and it can shoot coronal and sagittal images unlike CT, which can only take a cross-sectional image. Because of the advantage that the examiners can selectively take pictures, they are in the limelight as medical treatment means.

The application of high frequency to the subject in an MRI apparatus is performed by a transmitting RF coil and the sensing of a magnetic resonance signal from the subject is performed by a receiving RF coil. In some cases, an RF coil serving as both transmitting and receiving may be used.

6 (a) shows an RF coil 10 for MRI according to the related art in the form of a multi-channel array. The conventional RF coil array 10 is composed of a plurality of RF coil elements 11 arranged in a circle, and each RF coil element 11 is provided in the shape of a closed curve such as a circle, an ellipse, or a square.

The RF coil array 10 composed of these conventional types of RF coil elements 11 is limited in showing excellent characteristics in terms of the uniformity of the transmitting and receiving fields along the circumferential direction R thereof.

Improvement of the uniformity of the transmission / reception field of the RF coil array can contribute to improvement of the performance of the MRI, and therefore, there is a great need for a method for improving the uniformity of transmission and reception fields of the RF coil array.

SUMMARY OF THE INVENTION Accordingly, it is a primary object of the present invention to provide a multichannel RF coil array for MRI having a form capable of improving the uniformity of transmission / reception fields compared to the conventional art.

In order to achieve the above object, the present invention provides an MRI multichannel RF coil array arranged in a circle so as to surround an object to be examined, wherein at least one RF coil element among the plurality of RF coil elements constituting the multi- First and second coil portions disposed on a first plane and facing each other; And third and fourth coil portions respectively disposed on the second and third planes perpendicular to the first plane and connecting the first and second coil portions at positions facing each other, 3 and the fourth coil part each have a shape that is at a maximum distance from the first plane at a central point.

Wherein each of the third and fourth coil portions includes: a first region disposed on one side with respect to the center point; And a second area disposed on the other side with respect to the center point, wherein the first and second areas each have a shape in which the distance from the first plane gradually increases toward the center point have.

The first region and the second region may have the same shape.

Each of the third and fourth coil portions may have an arc shape.

The central angle of the arc may be 180 degrees.

In order to achieve the above object, the present invention also provides a RF coil array comprising: a first RF coil array arranged in a circular shape; And a second RF coil array arranged in a circle at an inner side or an outer side of the first RF coil array, wherein at least one RF coil element among the plurality of RF coil elements constituting the second RF coil array includes: 1 < / RTI > plane and facing each other; And third and fourth coil portions respectively disposed on the second and third planes perpendicular to the first plane and connecting the first and second coil portions at positions facing each other, 3 and the fourth coil part each have a shape that is at a maximum distance from the first plane at a central point.

Wherein each of the third and fourth coil portions includes: a first region disposed on one side with respect to the center point; And a second area disposed on the other side with respect to the center point, wherein the first and second areas each have a shape in which the distance from the first plane gradually increases toward the center point have.

Each of the plurality of RF coil elements constituting the first RF coil array may have a closed curve shape disposed on one single plane.

The RF coil element having the closed curve shape may have a circular shape, an elliptical shape, or a rectangular shape.

According to the multichannel RF coil array for MRI according to the present invention, compared with the multichannel RF coil array for MRI according to the related art, the uniformity of the transmission / reception field can be greatly improved and the MRI performance can be improved.

1 is a perspective view of a multi-channel RF coil array for MRI according to a first embodiment of the present invention.
FIG. 2 is a perspective view showing an individual RF coil element constituting the MRI multi-channel RF coil array of FIG. 1; FIG.
Figure 3 is a side view of the RF coil element of Figure 2;
4 is a perspective view of a multichannel RF coil array for MRI according to a second embodiment of the present invention.
5 is a perspective view showing an individual RF coil element constituting the MRI multi-channel RF coil array of FIG.
FIG. 6 is a diagram showing a distribution of a transmission-only field (B 1 + field) measured for the RF coil array according to the prior art and the RF coil arrays according to the first and second embodiments.
FIG. 7 is a diagram showing a distribution (B 1 filed distribution) of the magnetic field measured on the RF coil array according to the prior art and the RF coil arrays according to the first and second embodiments.
8 is a graph showing the B 1 distribution along the horizontal line P 1 -P 2 with respect to FIGS. 7A, 7B and 7C.
9 is a graph showing the B 1 distribution along the horizontal line P 1 -P 2 with respect to the vertical lines P 3 -P 4 for FIGS. 7A, 7B and 7C.

Hereinafter, embodiments of a multi-channel RF coil array for MRI according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view of an MRI multi-channel RF coil array according to a first embodiment of the present invention, FIG. 2 is a perspective view showing an individual RF coil element constituting the MRI multi-channel RF coil array of FIG. 1, Is a side view of the RF coil element of FIG.

1 to 3, the multichannel RF coil array 100 for MRI according to the first embodiment includes a plurality of RF coil elements 100 arranged in a circle so as to surround a subject (for example, a human head) 110).

In this embodiment, the RF coil array 100 is composed of a total of 16 RF coil elements 110, but the number of RF coil elements 110 is 8, 10, 14, 18, 20, etc. And can be variously changed. These RF coil elements 110 are arranged at regular intervals and equidistant from the central axis X of the RF coil array 100.

2, the RF coil element 110 includes a first coil part 150, a second coil part 160, a third coil part 170, and a fourth coil part 180 do.

The first and second coil parts 150 and 160 are disposed on one common plane (first plane) a and the third coil part 170 is arranged on a second plane perpendicular to the first plane alpha. and the fourth coil portion 180 is disposed in the third plane? perpendicular to the first plane?. Here, the second plane? And the third plane? Are in a parallel relationship with each other.

As shown in FIG. 2, for example, the first and second coil sections 150, 160 may be arranged in a straight line and may have an arrangement facing each other in parallel. The first and second coil parts 150 and 160 may be parallel to the central axis X of the RF coil array 110 (see FIG. 1).

Alternatively, the first and second coil portions 150, 160 may have a curved shape. For example, the first and second coil sections 150 and 160 may have a curved shape formed outwardly symmetrically and convexly. In this case, the first and second coil parts 150 and 160 may be provided in an arc shape.

The third and fourth coil portions 170 and 180 connect the first and second coil portions 150 and 160 at positions facing each other. Specifically, the third coil part 170 connects the two ends of the first and second coil parts 150 and 160, the fourth coil part 180 connects the first and second coil parts 150 and 160, And the other two ends of the two ends.

Each of the third and fourth coil portions 170 and 180 has a shape that is spaced apart from the first plane alpha at its center point C at its maximum. Each of the third and fourth coil parts 170 and 180 may be divided into a first area located on one side and a second area located on the other side with respect to the center point C of the first and second coil parts 170 and 180, It is preferable that each of the regions has a shape in which a distance to the first plane? Gradually increases toward the center point C, respectively.

The third and fourth coil parts 170 and 180 may have an arc shape as shown in FIG. 3 so that such a shapeal designing condition is satisfied. A third coil portion 170 is typically shown in FIG.

Referring to FIG. 3, the third coil part 170 is provided in an arc shape having a central angle of 180 degrees. That is, the third coil part 170 shown in FIG. 3 is provided in a semicircular shape. However, when the third coil part 170 is provided in an arc shape, its center angle may be variously changed to 210 degrees, 240 degrees, and the like.

3, the arc-shaped third coil part 170 has a first region 171 located on one side (left side in the figure) and a first region 171 located on the other side (right side in the drawing) And a second area 172 in which the second area 172 is located. The distance d with respect to the first plane? Gradually increases from the center point C toward the center point C of each of the first and second regions 171 and 172. Therefore, the distance from the third coil part 170 to the first plane alpha becomes maximum at the center point C.

Although the shape of the third and fourth coil portions 170 and 180 in FIG. 3 is illustrated as an arc, the shape of the third and fourth coil portions 170 and 180 may alternatively be a part of an ellipse, And the like.

In the above description of the first embodiment, all the RF coil elements 110 constituting the RF coil array 100 are illustrated as being the same as shown in FIG. 1, but alternatively, the RF coils 110 of the RF coil array 100 The shape of the coil element shown in Fig. 2 may be applied to a limited number of elements among the elements. For example, among the total of 14 RF coil elements, the shape of the coil element shown in Fig. 2 is applied to the eight RF coil elements disposed at odd positions along the circumferential direction of the array, and the remaining The shape of the conventional coil element shown in FIG. 6 (a) can be applied to the eight RF coil elements.

FIG. 4 is a perspective view of a multi-channel RF coil array for MRI according to a second embodiment of the present invention, and FIG. 5 is a perspective view showing individual RF coil elements constituting the MRI multi-channel RF coil array of FIG.

Referring to FIGS. 4 and 5, the MRI multi-channel RF coil array 200 according to the second embodiment of the present invention includes a first array 210 arranged in a circular shape inside and a second array 210 arranged in a circular shape outside (220).

As shown in Figs. 4 and 5, the first array 210 arranged inside is configured the same as the conventional RF coil array 10 as shown in Fig. 6 (a) The arrayed second array 220 can be configured in the same manner as the RF coil array 100 according to the first embodiment described above. In other words, the individual RF coil elements 211 constituting the first array 210 have a coil element form of a conventional form that is placed on a single plane as a whole, such as a circle, an ellipse, and a quadrangle, The individual RF coil elements 221 may have the form of an RF coil array 110 according to the first embodiment.

Alternatively, the MRI multi-channel RF coil array 200 according to the second embodiment includes the first and second arrays 210 and 220 described above, in which the conventional RF coil array 210 is arranged outside And the RF coil array 220 corresponding to the above-described first embodiment may be arranged inside.

The multi-channel RF coil arrays 100 and 200 according to the first and second embodiments described above have improved characteristics in terms of the uniformity of the transmission and reception fields exhibited by the coil array as compared with the multi-channel RF coil array 10 according to the related art , Which can contribute to improving the performance of MRI.

The improvement characteristics of the transmission and reception fields of the RF coil arrays 100 and 200 have been experimentally confirmed by the inventors of the present application, and FIGS. 6 to 8 show the experimental results.

6 is a diagram showing the measured B 1 + distribution for the RF coil array 10 according to the prior art and the RF coil arrays 100, 200 according to the first and second embodiments.

Referring to FIG. 6A, the B 1 + distribution of the conventional RF coil array 10 has an average value of 2.0 and a standard deviation of 1.14. Referring to FIG. 6B, the B 1 + distribution of the RF coil array 100 according to the first embodiment has an average value of 1.18 and a standard deviation of 0.48. Referring to FIG. 6C, The B 1 + distribution of the RF coil array 200 according to the embodiment has an average value of 1.55 and a standard deviation of 0.55.

Here, the RF coil arrays 100 and 200 according to the first and second embodiments are significantly reduced in the standard deviation of the B 1 + distribution as compared with the RF coil array 10 according to the related art, According to the RF coil arrays 100 and 200 according to the embodiments of the present invention, the uniformity of the transmission / reception field is improved compared to the conventional art.

7 is a graph showing the measured B 1 distribution for the RF coil array 10 according to the prior art and the RF coil arrays 100 and 200 according to the first and second embodiments, (a), (b) and (c) are views of a conventional RF coil array 10, an RF coil array 100 of the first embodiment, and an RF coil array 200 of the second embodiment.

8 is a graph showing the B 1 distribution along the horizontal line P 1 -P 2 with respect to each of FIGS. 7A, 7B and 7C, FIG. 9 is a graph showing the B 1 distribution along the horizontal line P 1 -P 2, , (c) is a graph showing the distribution of B 1 according to the horizontal line P1-P2 with respect to each of the vertical line P3-P4.

The graphs shown in FIG. 8 show distances between two points indicating half signal intensity of maximum signal intensity. The distance between two points of the conventional RF coil array 10, the RF of the first embodiment, It can be seen that the coil array 100 and the RF coil array 200 of the second embodiment have distances of 66, 74 and 90, respectively.

Similarly, the graphs shown in FIG. 9 also show distances between two points, which indicate half signal intensity of maximum signal intensity. The conventional RF coil array 10, the first It can be seen that the distance between the RF coil array 100 of the embodiment and the RF coil array 200 of the second embodiment is 66, 70, and 86, respectively.

As described above, the RF coil arrays 100 and 200 according to the embodiments of the present invention have an increased distance between two points that exhibit half signal intensity as compared with the conventional RF coil array 10, In the case of the exemplary RF coil array 100, the increase value is noticeable. Here, the increase in the distance between the two points representing the half strength means that the uniformity of the transmitting and receiving fields indicated by the coil array is increased.

As can be seen from the above experimental results, the multi-channel RF coil arrays 100 and 200 according to the embodiments of the present invention have uniformity of transmission / reception fields compared to the multi-channel RF coil array 10 according to the related art It is possible to greatly improve the MRI performance.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It can be understood that

100: multi-channel RF coil array (first embodiment)
110: RF coil element
150: first coil part
160: second coil part
170: third coil part
180: fourth coil part
200: multi-channel RF coil array (second embodiment)
210: first array
211: RF coil element
220: second array
221: RF coil element

Claims (9)

A multi-channel RF coil array for MRI arranged in a circular shape to surround an object to be examined,
At least one RF coil element among the plurality of RF coil elements constituting the multi-channel RF coil array,
First and second coil portions disposed on a first plane and facing each other; And
Third and fourth coil portions arranged on the second and third planes perpendicular to the first plane and connecting the first and second coil portions to each other at a position facing each other, Wherein each of the coil portions includes a first region disposed on one side with respect to a center point and a second region disposed on the other side with respect to the center point, And a third and a fourth coil part having a shape in which the spacing distance to one plane gradually increases.
Multichannel RF coil array for MRI.
delete The method according to claim 1,
Wherein the first region and the second region have the same shape,
Multichannel RF coil array for MRI.
The method according to claim 1,
Wherein each of the third and fourth coil portions has an arc shape,
Multichannel RF coil array for MRI.
5. The method of claim 4,
Wherein the central angle of the arc is 180 DEG,
Multichannel RF coil array for MRI.
A first RF coil array arranged in a circular shape; And
And a second RF coil array arranged in a circular shape inside or outside the first RF coil array,
At least one RF coil element among the plurality of RF coil elements constituting the second RF coil array,
First and second coil portions disposed on a first plane and facing each other; And
Third and fourth coil portions arranged on the second and third planes perpendicular to the first plane and connecting the first and second coil portions to each other at a position facing each other, Wherein each of the coil portions includes a first region disposed on one side with respect to a center point and a second region disposed on the other side with respect to the center point, And a third and a fourth coil part having a shape in which the spacing distance to one plane gradually increases.
Multichannel RF coil array for MRI.
delete The method according to claim 6,
Wherein each of the plurality of RF coil elements constituting the first RF coil array has a closed curve shape disposed on one single plane,
Multichannel RF coil array for MRI.
9. The method of claim 8,
The RF coil element having the closed curve shape may have a circular, elliptical, or rectangular shape,
Multichannel RF coil array for MRI.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1024025A (en) * 1996-07-15 1998-01-27 Toshiba Corp Rf coil unit for mri and coil regulating method
JP2004097606A (en) * 2002-09-11 2004-04-02 Ge Medical Systems Global Technology Co Llc Rf coil and magnetic resonance imaging device using the same
US20090134873A1 (en) * 2007-11-22 2009-05-28 Gachon University Of Medicine & Science Industry- Academic Cooperation Foundation Rf coil assembly for magnetic resonance imaging system
US7764065B2 (en) * 2007-10-01 2010-07-27 Siemens Aktiengesellschaft Arrangement for transmission of magnetic resonance signals

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1024025A (en) * 1996-07-15 1998-01-27 Toshiba Corp Rf coil unit for mri and coil regulating method
JP2004097606A (en) * 2002-09-11 2004-04-02 Ge Medical Systems Global Technology Co Llc Rf coil and magnetic resonance imaging device using the same
US7764065B2 (en) * 2007-10-01 2010-07-27 Siemens Aktiengesellschaft Arrangement for transmission of magnetic resonance signals
US20090134873A1 (en) * 2007-11-22 2009-05-28 Gachon University Of Medicine & Science Industry- Academic Cooperation Foundation Rf coil assembly for magnetic resonance imaging system

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