KR101886227B1

KR101886227B1 - Radio Frequency Coil For Magnetic Resonance Imaging

Info

Publication number: KR101886227B1
Application number: KR1020160171695A
Authority: KR
Inventors: 허필; 김경남; 류연철; 정준영
Original assignee: 가천대학교 산학협력단; (의료)길의료재단
Priority date: 2016-12-15
Filing date: 2016-12-15
Publication date: 2018-08-07
Also published as: KR20180069478A; WO2018110835A1

Abstract

The present invention relates to a radio frequency coil for a multi-RF excitation magnetic resonance imaging apparatus. According to the embodiment of the present invention, there is an advantage that a uniform magnetic field can be obtained even in an ultra-high magnetic field by correcting the phase of a current flowing in a conductor including at least two excitation parts.

Description

{Radio Frequency Coil for Magnetic Resonance Imaging}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio frequency coil for a magnetic resonance imaging apparatus, and more particularly to a radio frequency coil for a magnetic resonance imaging apparatus that maintains a homogeneity of a magnetic field even in an ultra-high magnetic field.

BACKGROUND ART Magnetic resonance imaging (MRI) devices and magnetic resonance spectroscopy (MRS) devices are known as magnetic resonance systems using nuclear magnetic resonance (NMR) phenomena. The magnetic resonance imaging apparatus uses a nuclear magnetic resonance phenomenon to photograph a cross section of a human body. Since nuclei such as hydrogen, phosphorus, sodium, and carbon isotopes in the human body have inherent rotational field constants due to nuclear magnetic resonance phenomena, the magnetization vectors of nuclei aligned in the direction of the main magnetic field (RF) coil is applied to a magnetization vector, and a magnetic resonance signal generated by rearrangement of magnetization vectors in a vertical plane due to frequency resonance is received by a radio frequency coil, Can be obtained.

The radio frequency coil used in the conventional magnetic resonance imaging apparatus shown in FIG. 1 has a single RF excitation method.

In the authors' magnetic resonance imaging apparatus, the uniformity of the magnetic field and the accuracy of the current phase produced by the single RF excitation radio frequency coil can be secured.

However, in a magnetic resonance imaging apparatus using a high magnetic field or a very high magnetic field, the wavelength becomes shorter as the frequency becomes higher.

Therefore, in a high-field magnetic resonance imaging apparatus having a high intensity of the main magnetic field, the radio frequency coil of the single RF excitation method has a problem that the uniformity of the magnetic field and the accuracy of the current phase are lowered.

1. Korean Patent No. 10-1424976

An object of the present invention is to provide a multi-RF excitation radio frequency coil for solving the above problems.

According to an aspect of the present invention, there is provided an RF loop coil for a magnetic resonance imaging apparatus, which includes at least two exciting parts supplied with current, and is capable of correcting a phase of a current flowing in a wire .

Advantageously, said at least two excitation portions may be receiving current from the same RF amplifier.

According to the present invention as described above, there is an advantage that the uniformity of the magnetic field produced by the radio frequency coil and the accuracy of the current phase are enhanced even in the ultra high magnetic field by using the multi-RF excitation method.

Figure 1 is a prior art radio frequency coil.
2 is a multi-RF excitation radio frequency coil according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will now be described, by way of example only, with reference to the accompanying drawings, in which: References to examples will be clear. It should be noted that the detailed description of known functions and constructions related to the present invention will not be described in detail when it is determined that the gist of the present invention may be unnecessarily blurred.

A radio frequency coil for a magnetic resonance imaging apparatus according to the present invention includes at least two exciting portions so that the phase of a current flowing in a conductor can be corrected.

Here, preferably, the radio frequency coil may be a closed-loop coil.

Specifically, as illustrated in FIG. 2, the radio frequency coil 1 for a magnetic resonance imaging apparatus of the present invention can be configured to include four excitation portions 10. [

The excitation unit 10 includes a power supply 100 for receiving a current from an RF (Radio Frequency) amplifier (not shown) and supplying the current to the coil, a capacitor 200, and an inductor 300.

The power supply 100 receives a current from the RF amplifier and supplies current to the capacitor 200 and the inductor 300.

The power supply 100, the capacitor 200, and the inductor 300 of the excitation unit 10 may be connected in series and each excitation unit may be connected in series.

In this embodiment, the four excitation units 10 are connected in series, but the present invention is not limited thereto.

In addition, at least two excitation parts 10 included in the radio frequency coil for a magnetic resonance imaging apparatus of the present invention may be supplied with current from the same RF amplifier.

The radio frequency coil 1 of the multi-RF excitation method including at least two excitation parts 10 proposed by the present invention can uniformize the current distribution of the long conductor even in the high magnetic field to the ultra high magnetic field and calibrate the current phase A magnetic field with high homogeneity can be produced.

That is, as the frequency becomes higher as the ultrahigh magnetic field increases, the length of the wavelength becomes shorter. As a result, a long RF line causes a phase difference of current in a single RF excitation method. However, It is possible to correct the current phase by preventing the phase delay by supplying current to at least two exciting portions 10 respectively.

While the present invention has been particularly shown and described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It will be appreciated that many changes and modifications may be made without departing from the invention. Accordingly, all such appropriate modifications and changes, and equivalents thereof, should be regarded as within the scope of the present invention.

1 Radio-frequency coil for magnetic resonance imaging
10 excitation
100 power supply
200 capacitors
300 inductor

Claims

In an RF loop coil for a magnetic resonance imaging apparatus,
And at least two exciting parts supplied with current to uniformize the current distribution of the conductor in the high magnetic field to the ultra high magnetic field and to correct the phase of the current flowing in the conductor,
Wherein the excitation unit comprises a power supply for supplying a current to the coil, a capacitor and an inductor, and connected in series,
Wherein the power source, the capacitor, and the inductor are connected in series.

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