KR20180069478A - Radio Frequency Coil For Magnetic Resonance Imaging - Google Patents
Radio Frequency Coil For Magnetic Resonance Imaging Download PDFInfo
- Publication number
- KR20180069478A KR20180069478A KR1020160171695A KR20160171695A KR20180069478A KR 20180069478 A KR20180069478 A KR 20180069478A KR 1020160171695 A KR1020160171695 A KR 1020160171695A KR 20160171695 A KR20160171695 A KR 20160171695A KR 20180069478 A KR20180069478 A KR 20180069478A
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- KR
- South Korea
- Prior art keywords
- magnetic resonance
- radio frequency
- resonance imaging
- frequency coil
- excitation
- Prior art date
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
- A61B5/055—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
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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
- G01R33/36—Electrical details, e.g. matching or coupling of the coil to the receiver
-
- 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
- G01R33/3628—Tuning/matching of the transmit/receive coil
- G01R33/3635—Multi-frequency operation
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- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Engineering & Computer Science (AREA)
- Medical Informatics (AREA)
- Radiology & Medical Imaging (AREA)
- General Physics & Mathematics (AREA)
- Biophysics (AREA)
- Pathology (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- High Energy & Nuclear Physics (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
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
BACKGROUND OF THE
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.
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
The
The
The
In this embodiment, the four
In addition, at least two
The
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
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 (2)
Wherein the RF loop coil includes at least two excitation parts supplied with current so as to correct the phase of the current flowing in the conductor.
Wherein the at least two excitation portions comprise:
And a current is supplied from the same RF amplifier. The RF loop coil for a multi-RF excitation magnetic resonance imaging apparatus.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020160171695A KR101886227B1 (en) | 2016-12-15 | 2016-12-15 | Radio Frequency Coil For Magnetic Resonance Imaging |
PCT/KR2017/012587 WO2018110835A1 (en) | 2016-12-15 | 2017-11-08 | Radio frequency coil for magnetic resonance imaging device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020160171695A KR101886227B1 (en) | 2016-12-15 | 2016-12-15 | Radio Frequency Coil For Magnetic Resonance Imaging |
Publications (2)
Publication Number | Publication Date |
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KR20180069478A true KR20180069478A (en) | 2018-06-25 |
KR101886227B1 KR101886227B1 (en) | 2018-08-07 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1020160171695A KR101886227B1 (en) | 2016-12-15 | 2016-12-15 | Radio Frequency Coil For Magnetic Resonance Imaging |
Country Status (2)
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KR (1) | KR101886227B1 (en) |
WO (1) | WO2018110835A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20240017252A (en) | 2022-07-29 | 2024-02-07 | 가천대학교 산학협력단 | RF coil for MRI with non-sysmmetrical current distribution |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07303623A (en) * | 1994-05-16 | 1995-11-21 | Ge Yokogawa Medical Syst Ltd | Rf coil for mri and mri apparatus |
JP2010525860A (en) * | 2007-05-04 | 2010-07-29 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Method for generating RF field and multi-channel RF transmitter |
US20110175616A1 (en) * | 2006-12-21 | 2011-07-21 | Hisaaki Ochi | Nuclear Magnetic Resonance Imaging System and Coil Unit |
KR101424976B1 (en) | 2012-11-08 | 2014-08-13 | 삼성전자주식회사 | Phased array RF coil for magnetic resonance imaging |
JP2015500127A (en) * | 2011-12-13 | 2015-01-05 | ビューレイ・インコーポレイテッドViewRay Incorporated | Active resistive shimming for MRI equipment |
KR20150022700A (en) * | 2013-08-23 | 2015-03-04 | 지멘스 악티엔게젤샤프트 | Magnetic resonance coil, magnetic resonance device and magnetic resonance system operating with said coil, as well as method for operating the magnetic resonance coil |
JP5705884B2 (en) * | 2011-02-14 | 2015-04-22 | 株式会社日立製作所 | RF coil and magnetic resonance imaging apparatus |
KR20150142489A (en) * | 2014-06-12 | 2015-12-22 | 삼성전자주식회사 | Radio frequency surface coil and Magnetic resonance imaging system comprising the same |
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2016
- 2016-12-15 KR KR1020160171695A patent/KR101886227B1/en active IP Right Grant
-
2017
- 2017-11-08 WO PCT/KR2017/012587 patent/WO2018110835A1/en active Application Filing
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07303623A (en) * | 1994-05-16 | 1995-11-21 | Ge Yokogawa Medical Syst Ltd | Rf coil for mri and mri apparatus |
US20110175616A1 (en) * | 2006-12-21 | 2011-07-21 | Hisaaki Ochi | Nuclear Magnetic Resonance Imaging System and Coil Unit |
JP2010525860A (en) * | 2007-05-04 | 2010-07-29 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Method for generating RF field and multi-channel RF transmitter |
JP5705884B2 (en) * | 2011-02-14 | 2015-04-22 | 株式会社日立製作所 | RF coil and magnetic resonance imaging apparatus |
JP2015500127A (en) * | 2011-12-13 | 2015-01-05 | ビューレイ・インコーポレイテッドViewRay Incorporated | Active resistive shimming for MRI equipment |
KR101424976B1 (en) | 2012-11-08 | 2014-08-13 | 삼성전자주식회사 | Phased array RF coil for magnetic resonance imaging |
KR20150022700A (en) * | 2013-08-23 | 2015-03-04 | 지멘스 악티엔게젤샤프트 | Magnetic resonance coil, magnetic resonance device and magnetic resonance system operating with said coil, as well as method for operating the magnetic resonance coil |
KR20150142489A (en) * | 2014-06-12 | 2015-12-22 | 삼성전자주식회사 | Radio frequency surface coil and Magnetic resonance imaging system comprising the same |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20240017252A (en) | 2022-07-29 | 2024-02-07 | 가천대학교 산학협력단 | RF coil for MRI with non-sysmmetrical current distribution |
Also Published As
Publication number | Publication date |
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KR101886227B1 (en) | 2018-08-07 |
WO2018110835A1 (en) | 2018-06-21 |
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