KR101676192B1 - Multi-channel RF coil array for MRI - Google Patents

Multi-channel RF coil array for MRI Download PDF

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KR101676192B1
KR101676192B1 KR1020150138987A KR20150138987A KR101676192B1 KR 101676192 B1 KR101676192 B1 KR 101676192B1 KR 1020150138987 A KR1020150138987 A KR 1020150138987A KR 20150138987 A KR20150138987 A KR 20150138987A KR 101676192 B1 KR101676192 B1 KR 101676192B1
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서증훈
한상덕
김경남
류연철
정준영
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(의료)길의료재단
가천대학교 산학협력단
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    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
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Abstract

The present invention relates to a multichannel RF coil array for a MRI apparatus, and more particularly, to a multi-channel transmission RF coil using a plurality of CP (circular polarized) modes in a MRI apparatus, A multi-channel RF coil array for a device, the multi-channel RF coil array comprising L coil elements surrounding a subject in a circle, the L coil elements comprising a plurality of coil groups A plurality of current phase values are applied to a plurality of coil elements belonging to each coil group by an integer multiple of 360 ° / L, and the plurality of current phase values applied to each coil group are applied to the other coil For magnetic resonance imaging devices that are independently applied to a plurality of current phase values applied to a group A plurality of current phase values applied to each of the first coil group and the second coil group can be independently applied to each other, thereby providing a uniform magnetic field.

Description

[0001] Multi-channel RF coil array for MRI [0002]

The present invention relates to a multi-channel RF coil array for a MRI apparatus, and more particularly, to a multi-channel transmission RF coil using a plurality of CP (circular polarized) modes in a MRI apparatus.

Magnetic resonance imaging (MRI) is a medical device that displays images of the distribution of hydrogen nuclei in the body by applying harmonics that are harmless to the human body.

It is a technique to reconstruct and visualize the magnetic properties of materials constituting the human body through computer.

The principles of MRI are already well known.

Obviously, in order to obtain an image of a test site to be known by the MRI apparatus, it is necessary to apply a high-quality magnetic field to the test object, or to receive a signal emitted from the hydrogen atom nucleus well, More important than anything else.

Uniform application to the inside of the object to be inspected will be the best way to obtain a clear image.

On the other hand, conventional general multi-channel transmission / reception coils are mainly used for improving the uniformity of transmission-only fields in the form of coils applied in ultra-high magnetic field MR systems.

1 is a circuit in which a multi-channel transmitting / receiving coil 40 is applied using a single amplifier 10 in a conventional microwave MRI system.

When the conventional multi-channel transmitting / receiving coil 40 using a single amplifier is composed of eight channels, for example, each coil has a phase difference of 45 degrees between 0 and 45 degrees from the first channel to the eighth channel, The RF source may be applied to each of the RF signals to be respectively processed by the phase conversion unit 30 and the driving unit 20 so as to have the degrees of freedom, 90 degrees, 135 degrees, 180 degrees, 225 degrees, 270 degrees and 315 degrees.

The multi-channel transmission / reception coil 40 using the conventional single amplifier 10 has a problem that the uniformity of a transmission-only field is reduced in the form of a coil applied to an ultra-high-field MR system.

Korean Patent No. 805,600 discloses a method and apparatus for improving the uniformity of a magnetic resonance image using a time division multiple high frequency pulse.

Korean Patent No. 805,600 relates to a technique of applying a high-frequency pulse waveform to a human body in a time division manner in order to improve the uniformity of a magnetic resonance image.

This is to overcome the problem that the uniformity of the image is lowered in the human body due to the short wavelength of the electromagnetic wave in the high-field magnetic resonance imaging system of 3.0 Tesla or more. When a time-divided high frequency pulse is applied to the phased array high frequency coil, And to improve the spatial RBS latitude of the high frequency magnetic field applied to the human body.

This includes generating high-frequency pulses as time-division multiplexed pulses, and applying a time-divided high-frequency pulse to the high-frequency coil, which also has the problem that the uniformity of the transmission field is not constant.

(Patent Document 1) KR805600 B1

(Patent Document 2) US7091721 B2

(Patent Document 3) US 6608480 B1

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a magnetic field- Channel RF coil array for a resonance imaging apparatus.

According to an aspect of the present invention, there is provided a multichannel RF coil array for a magnetic resonance imaging apparatus, the multichannel RF coil array including L coil elements surrounding a subject in a circular shape, Elements are divided into a plurality of coil groups constituted by a plurality of coil elements, and a plurality of current phase values increasing by an integer multiple of 360 DEG / L are applied to a plurality of coil elements belonging to each coil group, The plurality of current phase values applied to the coil group are independently applied to a plurality of current phase values applied to different coil groups.

Also, the multi-channel RF coil array includes 2 x N coil elements in a circle, and the 2 x N coil elements are arranged at odd numbers along the circumferential direction of the multi-channel RF coil array A first coil group composed of N coil elements and a second coil group composed of N coil elements disposed at even-numbered positions along the circumferential direction, wherein the first coil group and the second coil group CP (M, n) = {360 DEG (CP)) is applied to each of the coil elements according to the CP mode of 2 x N current phase (CP) N is an integer other than 0 between -N and N, and n is an integer from 0 to N in each group. Indicate the placement order of each coil element Is a natural number for the MRI apparatus from between 1 N and a channel RF coil arrays.

The present invention as described above has the following effects.

A plurality of current phase values applied to each of the first coil group and the second coil group can be independently applied to each other, thereby making it possible to form a uniform magnetic field.

FIG. 1 is a conceptual diagram of transmission and reception of an RF coil to which a single amplifier according to the related art is applied, and FIG. 2 is a perspective view of an 8-channel RF coil array according to the related art.
FIG. 3 is a cross-sectional view of a multichannel RF coil array for an 8-channel MRI RF coil array according to a first embodiment of the present invention, in which a CP + 2 mode is applied to a first coil group, Channel RF coil array for a magnetic resonance imaging apparatus to which a mode is applied.
4 is a cross-sectional view of a multi-channel RF coil array for an 8-channel MRI RF coil array according to a second preferred embodiment of the present invention, in which a CP + 1 mode is applied to a first coil group, Channel RF coil array for a magnetic resonance imaging apparatus to which a mode is applied.
FIG. 5 is a cross-sectional view of a multichannel RF coil array for a 16-channel magnetic resonance imaging apparatus according to a third embodiment of the present invention, in which the CP + 3 mode is applied to the first coil group, Channel RF coil array for a magnetic resonance imaging apparatus to which a mode is applied.
6 is a cross-sectional view of a multi-channel RF coil array for a 16-channel MRI RF coil array according to a fourth embodiment of the present invention, in which a CP + 2 mode is applied to a first coil group, Channel RF coil array for a magnetic resonance imaging apparatus to which a mode is applied.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, the definitions of these terms should be described based on the contents throughout this specification.

The multi-channel RF coil array to be described below includes 2 x N coil elements that surround the object in a circular pattern.

The 2 x N coil elements have a first coil group composed of N coil elements arranged at odd numbers along the circumferential direction of the multi-channel RF coil array.

And a second coil group composed of N coil elements arranged at even-numbered positions along the circumferential direction.

The coil elements of each of the first coil group and the second coil group are supplied with currents according to any one of the CP mode of the 2 × N current phase (CP) mode defined by the following CP mode equation.

CP (M, n) = {360 占 / (2 占 N)} 占 M 占 (n-1)

In the above formula, N is a natural number of 4 or more, M is a number specifying a mode and is an integer other than 0 between -N and N, and n is a natural number from 1 to N indicating the arrangement order of each coil element in each group .

This will be described in more detail as follows.

Figure 112015095559306-pat00001

Table 1 shows the arrangement order in the coil group and thus the phase values of the CP mode in the multichannel RF coil array for a magnetic resonance imaging apparatus having 8 channels according to the preferred embodiment of the present invention.

FIG. 3 is a cross-sectional view of a multichannel RF coil array for an 8-channel MRI RF coil array according to a first embodiment of the present invention, in which a CP + 2 mode is applied to a first coil group, Channel RF coil array for a magnetic resonance imaging apparatus to which a mode is applied.

A multi-channel RF coil array for a magnetic resonance imaging apparatus is composed of a total of eight channels.

The odd channel group which is the first coil group has the first channel, the third channel, the fifth channel and the seventh channel, and the even channel group which is the second coil group has the second channel, the fourth channel, 8 channels.

Here, the value of n means the arrangement order of the channels in each coil group.

For example, the first channel, which is the first channel of the odd channel group which is the first coil group, has an n value of 1, the nth value of the third channel which is the second channel is 2, the nth value of the fifth channel which is the third channel, , And the seventh channel, which is the fourth channel, has an n value of 4.

This applies equally to the even channel group which is the second coil group.

In this case, applicable CP modes are CP + 1, CP + 2, CP + 3 and CP + 4 modes and CP-1, CP-2, CP-3 and CP-4 modes . That is, each of the first coil group and the second coil group includes a CP + 1 mode, a CP + 2 mode, a CP + 3 mode, a CP + 4 mode, a CP-1 mode, a CP- Any one of the modes may be applied.

In each CP mode, the phase increases or decreases by n times as the value of n increases.

Referring to Table 1, when the CP + 2 mode is applied to the odd channel as the first coil group, for example, as shown in FIG. 3, a 0-degree phase value is applied to the first channel with the n value of 1, + 90 degrees phase value is applied to the second channel 3, a + 180 degree phase value is applied to the fifth channel where the n value is 3, and +270 degrees phase value is applied to the seventh channel where the n value is 4 do.

When the CP-1 mode is applied to the even-numbered channel, which is the second coil group, for example, the 0-degree phase value is applied to the second channel having the n value of 1, and the- The phase value is applied to the sixth channel having the n value of 3, and the phase value is applied to the eighth channel having the n value of 4 and -135 degrees.

As described above, the plurality of current phase values applied to the first coil group and the second coil group can be independently applied to each other, so that a uniform magnetic field can be formed.

4 is a cross-sectional view of a multi-channel RF coil array for an 8-channel MRI RF coil array according to a second preferred embodiment of the present invention, in which a CP + 1 mode is applied to a first coil group, Channel RF coil array for a magnetic resonance imaging apparatus to which a mode is applied.

Referring to Table 1, when the CP + 1 mode is applied to the odd channel, which is the first coil group, for example, as shown in FIG. 4, a 0-degree phase value is applied to the first channel having an n value of 1, +45 degrees phase value is applied to the second channel 3, a + 90 degree phase value is applied to the fifth channel where the n value is 3, and a +135 phase value is applied to the seventh channel where the n value is 4 do.

When the CP-4 mode is applied to the even-numbered channel, which is the second coil group, for example, the 0-degree phase value is applied to the second channel having the n value of 1, and -180 A phase value of -360 degrees is applied to a sixth channel having an n value of 3 and a phase value of -540 degrees is applied to an eighth channel having an n value of 4.

As described above, the plurality of current phase values applied to the first coil group and the second coil group can be independently applied to each other, so that a uniform magnetic field can be formed.

It should be understood that other CP modes can be applied independently to each coil group by the same principle as above.

Next, a case where a multi-channel RF coil array for a magnetic resonance imaging apparatus is composed of a total of 16 channels will be described.

Figure 112015095559306-pat00002

Table 2 shows the arrangement order in the coil group and thus the phase values of the CP mode in the multichannel RF coil array for MRI apparatuses of 16 channels according to another preferred embodiment of the present invention.

The odd channel group which is the first coil group has the first channel, the third channel, the fifth channel, the seventh channel, the ninth channel, the eleventh channel, the thirteenth channel and the fifteenth channel, The channel group has a second channel, a fourth channel, a sixth channel, an eighth channel, a tenth channel, a twelfth channel, a fourteenth channel, and a sixteenth channel.

Here, the value of n means the arrangement order of the channels in each coil group.

For example, the first channel, which is the first channel of the odd channel group which is the first coil group, has an n value of 1, the nth value of the third channel which is the second channel is 2, the nth value of the fifth channel which is the third channel, , The nth value of the seventh channel is 4, the nth value of the ninth channel is 5, the nth value of the sixth channel is 6, and the seventh channel is the sixth channel. the n value is 7, and the 15th channel, the eighth channel, has an n value of 8.

This applies equally to the even channel group which is the second coil group.

In this case, the applicable CP modes are CP 1, CP 2, CP 3, CP 4, CP 5, CP 6, CP 7, 3, CP-4, CP-5, CP-6, CP-7 and CP-8 modes. That is, each of the first and second coil groups is divided into a CP + 1 mode, a CP + 2 mode, a CP + 3 mode, a CP + 4 mode, a CP + 5 mode, a CP + 6 mode, a CP + , CP-1 mode, CP-2 mode, CP-3 mode, CP-4 mode, CP-5 mode, CP-6 mode, CP-7 mode and CP-8 mode can be applied.

In each CP mode, the phase increases or decreases by n times as the value of n increases.

FIG. 5 is a cross-sectional view of a multi-channel RF coil array for a 16-channel MRI RF coil array according to a third embodiment of the present invention, in which the CP + 3 mode is applied to the first coil group, Channel RF coil array for a magnetic resonance imaging apparatus to which a mode is applied.

Referring to Table 2, when the CP + 3 mode is applied to the odd-numbered channel, which is the first coil group, for example, the 0-degree phase value is applied to the first channel having the n value of 1, A phase value of +67.5 degrees is applied to the third channel, a phase value of +135 degrees is applied to the fifth channel having the n value of 3, a phase value of +202.5 degrees is applied to the seventh channel having the n value of 4, A +270 degree phase value is applied to the ninth channel of 5, +337.5 degrees of phase value is applied to the eleventh channel of the n value of 6, and a +405 degree phase value is applied to the thirteenth channel of the n value of 7 And a phase value of +472.5 degrees is applied to the fifteenth channel having n = 8.

When the CP-7 mode is applied to the even-numbered channel, which is the second coil group, for example, the 0-degree phase value is applied to the second channel having the n value of 1, A phase value of -360 degrees is applied to the sixth channel having the n value of 3 and a phase value of -540 degrees is applied to the eighth channel having the n value of 4 and a tenth channel having the n value of 5 is applied A phase value of -787.5 degrees is applied to the twelfth channel having the n value of 6, and a phase value of -945 degrees is applied to the fourteenth channel having the n value of 7. When the n value is equal to 8 And a -1102.5 degree phase value is applied to the 16th channel.

As described above, the plurality of current phase values applied to the first coil group and the second coil group can be independently applied to each other, so that a uniform magnetic field can be formed.

It should be understood that other CP modes can be applied independently to each coil group by the same principle as above.

6 is a cross-sectional view of a multi-channel RF coil array for a 16-channel MRI RF coil array according to a fourth embodiment of the present invention, in which a CP + 2 mode is applied to a first coil group, Channel RF coil array for a magnetic resonance imaging apparatus to which a mode is applied.

Referring to Table 2, when the CP + 2 mode is applied to the odd channel which is the first coil group, for example, a 0-degree phase value is applied to the first channel having an n value of 1, and a 0- A +45 degree phase value is applied to the third channel, a +90 degree phase value is applied to the fifth channel having the n value of 3, and a +135 phase value is applied to the seventh channel having the n value of 4, A phase value of +180 degrees is applied to the ninth channel of 5, a phase value of +225 degrees is applied to the eleventh channel of which n is 6, and a phase value of +270 degrees is applied to the thirteenth channel of which n is 7 And a phase value of +315 degrees is applied to the fifteenth channel having an n value of 8.

If the CP-1 mode is applied to the even-numbered channel, which is the second coil group, for example, the 0-degree phase value is applied to the second channel having the n value of 1, and the- A phase value of -45 degrees is applied to a sixth channel having an n value of 3 and a phase value of -67.5 degrees is applied to an eighth channel having an n value of 4. When the nth value is 5, A phase value of -125 degrees is applied to the twelfth channel having the n value of 6, and a phase value of -135 degrees is applied to the fourteenth channel having the n value of 7. When the n value is equal to 8 And a phase value of -157.5 degrees is applied to the 16th channel.

As described above, the plurality of current phase values applied to the first coil group and the second coil group can be independently applied to each other, so that a uniform magnetic field can be formed.

It should be understood that other CP modes can be applied independently to each coil group by the same principle as above.

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 will be understood that the present invention can be changed.

10: Conventional single amplifier
20:
30:
40: Multi-channel transmission / reception coils

Claims (2)

delete In a multi-channel RF coil array for a magnetic resonance imaging apparatus,
The multi-channel RF coil array includes L coil elements surrounding a subject in a circular shape,
The L coil elements are divided into a plurality of coil groups each composed of a plurality of coil elements, and a plurality of current phase values are applied to a plurality of coil elements belonging to each coil group by an integer multiple of 360 DEG / L Wherein the plurality of current phase values applied to each coil group are independently applied to a plurality of current phase values applied to different coil groups,
The multi-channel RF coil array includes 2 x N coil elements which surround the object in a circular shape,
Wherein the 2 x N coil elements comprise:
A first coil group composed of N coil elements disposed at odd positions along the circumferential direction of the multi-channel RF coil array,
And a second coil group composed of N coil elements disposed at even-numbered positions along the circumferential direction,
The coil elements of each of the first coil group and the second coil group are supplied with currents according to any one of the CP mode of the 2 × N current phase (CP) mode defined by the following CP mode equation ,
CP (M, n) = {360 占 / (2 占 N)} 占 M 占 (n-1)
In the above equation, N is a natural number of 4 or more, M is a number specifying a mode, and is an integer other than 0 between -N and N, and n is a natural number from 1 to N indicating the arrangement order of each coil element in each group sign,
Multichannel RF coil array for magnetic resonance imaging.


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