JPH06209922A - Mr device - Google Patents

Mr device

Info

Publication number
JPH06209922A
JPH06209922A JP5008457A JP845793A JPH06209922A JP H06209922 A JPH06209922 A JP H06209922A JP 5008457 A JP5008457 A JP 5008457A JP 845793 A JP845793 A JP 845793A JP H06209922 A JPH06209922 A JP H06209922A
Authority
JP
Japan
Prior art keywords
radio wave
nmr
signal
modulated
nmr signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP5008457A
Other languages
Japanese (ja)
Inventor
Hiromi Kawaguchi
博巳 川口
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GE Healthcare Japan Corp
Original Assignee
Yokogawa Medical Systems Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yokogawa Medical Systems Ltd filed Critical Yokogawa Medical Systems Ltd
Priority to JP5008457A priority Critical patent/JPH06209922A/en
Publication of JPH06209922A publication Critical patent/JPH06209922A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00Arrangements or instruments for measuring magnetic variables
    • G01R33/20Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/32Excitation or detection systems, e.g. using radio frequency signals
    • G01R33/36Electrical details, e.g. matching or coupling of the coil to the receiver
    • G01R33/3692Electrical details, e.g. matching or coupling of the coil to the receiver involving signal transmission without using electrically conductive connections, e.g. wireless communication or optical communication of the MR signal or an auxiliary signal other than the MR signal

Abstract

PURPOSE:To dispense with a coaxial cable for transmitting NMR signals. CONSTITUTION:The NMR signal received by a coil 2 is inputted into the first gate GI of a dual gate FET 4. The second gate G2 receives the carrier supplied from an oscillator 3. The modulated signal fM having the NMR signal as modulation signal is generated, and radiated as electric wave from a transmission antenna 5. This electric wave is received by a receiving antenna 21, and the NMR signal is taken out by a decoder. The NMR signal is processed by an information processing part 23. Accordingly, the pulling-in of the outside noise by a coaxial cable is eliminated, and S/N can be improved. Further, an operator is prevented from being burnt because of the contact with the coaxial cable. In installation, the necessity of turning-pulling of the coaxial cable is obviated.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明は、MR装置に関し、さ
らに詳しくは、受信コイルで受信したNMR信号を電波
で情報処理部に伝送するMR装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an MR device, and more particularly to an MR device for transmitting an NMR signal received by a receiving coil to an information processing section by radio waves.

【0002】[0002]

【従来の技術】図5は、従来のMR装置501の受信系
の構成図である。NMR信号は、スキャンルーム内のコ
イル2(ボディコイル,サーフェイスコイル,ヘッドコ
イルなど)で受信され、スイッチ回路Bから取り出さ
れ、同軸ケーブルLを介してスキャンルーム外のプリア
ンプ51に伝送され、情報処理部23に導かれ処理され
る。通常、同軸ケーブルLは、長さ5m〜10mであ
る。
2. Description of the Related Art FIG. 5 is a block diagram of a receiving system of a conventional MR device 501. The NMR signal is received by the coil 2 (body coil, surface coil, head coil, etc.) in the scan room, taken out from the switch circuit B, transmitted to the preamplifier 51 outside the scan room via the coaxial cable L, and processed. It is guided to the section 23 and processed. Usually, the coaxial cable L has a length of 5 m to 10 m.

【0003】[0003]

【発明が解決しようとする課題】上記従来のMR装置5
01では、長い同軸ケーブルLを用いているため、その
同軸ケーブルLが外部ノイズを引き込む問題点がある。
また、送信時のRFパルスの電力で同軸ケーブルLの外
側シールド線が高温に加熱され、接触した人に火傷を負
わせる問題点がある。さらに、設置時に、同軸ケーブル
Lを引き回す手間がかかる問題点がある。そこで、この
発明の目的は、同軸ケーブルLをなくすことにより上記
問題点を解消したMR装置を提供することにある。
The above-mentioned conventional MR device 5
In No. 01, since the long coaxial cable L is used, there is a problem that the coaxial cable L draws in external noise.
In addition, there is a problem that the outer shield wire of the coaxial cable L is heated to a high temperature by the power of the RF pulse at the time of transmission, and the contact person is burned. Further, there is a problem that it takes time and effort to draw the coaxial cable L at the time of installation. Therefore, an object of the present invention is to provide an MR device which eliminates the above problems by eliminating the coaxial cable L.

【0004】[0004]

【課題を解決するための手段】この発明のMR装置は、
受信コイルで受信したNMR信号で搬送波を変調して被
変調信号を生成する変調手段と、前記被変調信号に基づ
いて電波を送信する電波送信手段と、前記電波を受信す
る電波受信手段と、その受信した電波から前記NMR信
号を復調して取り出す復調手段とを具備したことを構成
上の特徴とするものである。
The MR device of the present invention comprises:
Modulating means for modulating a carrier wave with an NMR signal received by a receiving coil to generate a modulated signal, radio wave transmitting means for transmitting a radio wave based on the modulated signal, radio wave receiving means for receiving the radio wave, and It is characterized in that it comprises demodulation means for demodulating and extracting the NMR signal from the received radio wave.

【0005】[0005]

【作用】この発明のMR装置では、受信コイルで受信し
たNMR信号を変調信号として被変調信号を生成し、そ
の被変調信号に基づいて電波を送信する。そして、その
電波を受信し復調してNMR信号を取り出す。このた
め、同軸ケーブルをなくすことが出来るから、外部ノイ
ズの引き込みがなくなり、S/Nを向上できる。また、
人が同軸ケーブルに接触して火傷を負うことを防止でき
る。さらに、設置時に、同軸ケーブルを引き回す手間が
かからなくなる。
In the MR device of the present invention, a modulated signal is generated using the NMR signal received by the receiving coil as a modulation signal, and a radio wave is transmitted based on the modulated signal. Then, the radio wave is received and demodulated to extract an NMR signal. For this reason, since the coaxial cable can be eliminated, external noise is not drawn in and S / N can be improved. Also,
It is possible to prevent a person from coming into contact with the coaxial cable and getting burned. In addition, it eliminates the need to pull the coaxial cable around during installation.

【0006】[0006]

【実施例】以下、図に示す実施例によりこの発明をさら
に詳しく説明する。なお、これによりこの発明が限定さ
れるものではない。
The present invention will be described in more detail with reference to the embodiments shown in the drawings. The present invention is not limited to this.

【0007】−第1実施例− 図1は、この発明の第1実施例によるMR装置1の構成
図である。NMR信号は、スキャンルーム内のコイル2
(ボディコイル,サーフェイスコイル,ヘッドコイルな
ど)で受信され、スイッチ回路Bから取り出され、デュ
アルゲートFET4の第1ゲートG1に入力される。デ
ュアルゲートFET4の第2ゲートG2には、発振器3
からの搬送波f0が入力される。この搬送波f0は、N
MR信号の周波数より高い周波数であり、例えばNMR
信号の周波数が64MHzのとき、搬送波f0の周波数は
400MHzである。デュアルゲートFET4は、NMR
信号を変調信号として搬送波f0を振幅変調した被変調
信号fMを生成し、送信アンテナ5へ送り出す。送信ア
ンテナ5からは、電波が放射される。
First Embodiment FIG. 1 is a block diagram of an MR device 1 according to a first embodiment of the present invention. The NMR signal is sent to the coil 2 in the scan room.
It is received by (body coil, surface coil, head coil, etc.), taken out from the switch circuit B, and inputted to the first gate G1 of the dual gate FET4. The oscillator 3 is connected to the second gate G2 of the dual gate FET4.
The carrier wave f0 from is input. This carrier wave f0 is N
A frequency higher than the frequency of the MR signal, for example NMR
When the frequency of the signal is 64 MHz, the frequency of the carrier f0 is 400 MHz. Dual gate FET4 is NMR
A modulated signal fM in which the carrier wave f0 is amplitude-modulated using the signal as a modulation signal is generated and sent to the transmitting antenna 5. Radio waves are radiated from the transmitting antenna 5.

【0008】送信アンテナ5から放射された電波は、受
信アンテナ21により受信される。そして、復調器22
によりNMR信号が取り出され、情報処理部23に導か
れ処理される。
Radio waves radiated from the transmitting antenna 5 are received by the receiving antenna 21. And the demodulator 22
Thus, the NMR signal is extracted, guided to the information processing unit 23, and processed.

【0009】なお、発振器3やデュアルゲートFET4
の電源Eには、外部からの配線を避けるため、光電池や
2次電池を用いるのが好ましい。
The oscillator 3 and the dual gate FET 4
It is preferable to use a photocell or a secondary battery as the power source E in order to avoid wiring from the outside.

【0010】上記第1実施例のMR装置1によれば、コ
イル2で受信したNMR信号を電波によりスキャンルー
ム外の情報処理部23側に伝送するので、同軸ケーブル
をなくすことが出来る。このため、外部ノイズの引き込
みがなくなり、S/Nを向上できる。また、人が同軸ケ
ーブルに接触して火傷を負うことがなくなる。さらに、
設置時に、同軸ケーブルを引き回す必要がなくなる。
According to the MR device 1 of the first embodiment, since the NMR signal received by the coil 2 is transmitted to the information processing section 23 outside the scan room by radio waves, the coaxial cable can be eliminated. Therefore, the external noise is not drawn in, and the S / N can be improved. In addition, a person does not get in contact with the coaxial cable and get burned. further,
Eliminates the need to route coaxial cables during installation.

【0011】−第2実施例− 図2は、この発明の第2実施例によるMR装置の構成図
である。このMR装置101は、上記第1実施例による
MR装置1と基本的には同じ構成であり、サーフェイス
コイル2a〜2c(図示の都合から3つのみ示す)で受
信したNMR信号S1〜S3で搬送波f0をそれぞれデ
ュアルゲートFET4a〜4cで変調して被変調信号f
Ma〜fMcを生成する。これら被変調信号fMa〜f
Mcは、各サーフェイスコイル2a〜2cの配置状態に
応じた位相差を持っているので、それを位相補償回路6
a〜6cにより補償する。そして、位相差を補償した被
変調信号fMa〜fMcを合成器7で合成して被変調信
号fMを生成し、送信アンテナ5へ送り出す。送信アン
テナ5からは、電波が放射される。
-Second Embodiment- FIG. 2 is a block diagram of an MR apparatus according to a second embodiment of the present invention. This MR device 101 has basically the same configuration as the MR device 1 according to the first embodiment described above, and uses the NMR signals S1 to S3 received by the surface coils 2a to 2c (only three are shown for convenience of illustration) as a carrier wave. f0 is modulated by each of the dual gate FETs 4a to 4c and the modulated signal f
Ma to fMc are generated. These modulated signals fMa to f
Since Mc has a phase difference according to the arrangement state of the surface coils 2a to 2c, the phase compensation circuit 6
Compensate with a to 6c. Then, the modulated signals fMa to fMc in which the phase difference is compensated are combined by the combiner 7 to generate the modulated signal fM, which is sent to the transmitting antenna 5. Radio waves are radiated from the transmitting antenna 5.

【0012】送信アンテナ5から放射された電波は、受
信アンテナ21により受信される。そして、復調器22
によりNMR信号が取り出され、情報処理部23に導か
れ処理される。
Radio waves radiated from the transmitting antenna 5 are received by the receiving antenna 21. And the demodulator 22
Thus, the NMR signal is extracted, guided to the information processing unit 23, and processed.

【0013】−第3実施例− 図3は、この発明の第3実施例によるMR装置201の
構成図である。NMR信号は、バードケージコイル(後
述)の各エレメントEa〜Ec(図示の都合から3つの
み示す)で受信され、各ダイオード保護回路8a〜8c
に入力される。ダイオード保護回路8a〜8cは、RF
パルスを遮断し、NMR信号のみを通過させて、ディレ
イ回路9a,9b,9cに入力する。
Third Embodiment FIG. 3 is a block diagram of an MR device 201 according to the third embodiment of the present invention. The NMR signal is received by each element Ea to Ec (only three are shown for convenience of illustration) of the birdcage coil (described later), and each diode protection circuit 8a to 8c.
Entered in. The diode protection circuits 8a to 8c are RF
The pulse is cut off, only the NMR signal is allowed to pass, and is input to the delay circuits 9a, 9b, 9c.

【0014】図4に示すように、バードケージコイルB
Cは、複数のエレメントEa,Eb,…を1対のリング
状導体L1,L2間に張設したものであるから、エレメ
ントEa,Eb,…の位置に応じて各NMR信号は位相
差を持っている。そこで、ディレイ回路9a,9b,9
cは、これらNMR信号の位相差を補償し、各デュアル
ゲートFET4a,4b,4cの第1ゲートG1に入力
する。
As shown in FIG. 4, the birdcage coil B
Since C has a plurality of elements Ea, Eb, ... Tensioned between a pair of ring-shaped conductors L1, L2, each NMR signal has a phase difference depending on the position of the elements Ea, Eb ,. ing. Therefore, the delay circuits 9a, 9b, 9
c compensates for the phase difference of these NMR signals and inputs them to the first gate G1 of each dual gate FET 4a, 4b, 4c.

【0015】デュアルゲートFET4a,4b,4cの
第2ゲートG2には、発振器3からの搬送波f0が入力
されている。そこで、デュアルゲートFET4a,4
b,4cは、NMR信号を変調信号として搬送波f0を
振幅変調した被変調信号fMa,fMb,fMcを生成
する。合成器7は、前記被変調信号fMa〜fMcを合
成して被変調信号fMを生成し、送信アンテナ5へ送り
出す。送信アンテナ5からは、電波が放射される。
The carrier f0 from the oscillator 3 is input to the second gate G2 of the dual gate FETs 4a, 4b and 4c. Therefore, the dual gate FETs 4a, 4
b and 4c generate modulated signals fMa, fMb, and fMc in which the carrier wave f0 is amplitude-modulated using the NMR signal as a modulation signal. The combiner 7 combines the modulated signals fMa to fMc to generate a modulated signal fM and sends it to the transmitting antenna 5. Radio waves are radiated from the transmitting antenna 5.

【0016】送信アンテナ5から放射された電波は、受
信アンテナ21により受信される。そして、復調器22
によりNMR信号が取り出され、情報処理部23に導か
れ処理される。
Radio waves radiated from the transmitting antenna 5 are received by the receiving antenna 21. And the demodulator 22
Thus, the NMR signal is extracted, guided to the information processing unit 23, and processed.

【0017】−他の実施例− 他の実施例としては、第3実施例のMR装置201にお
いて、ディレイ回路9a,9b,9cの出力を合成して
から1つのデュアルゲートFETの第1ゲートG1に入
力するものが挙げられる。
-Other Embodiments-As another embodiment, in the MR device 201 of the third embodiment, the outputs of the delay circuits 9a, 9b and 9c are combined and then the first gate G1 of one dual gate FET is used. What to enter in.

【0018】[0018]

【発明の効果】この発明のMR装置によれば、コイルで
受信したNMR信号を電波によりスキャンルーム外の情
報処理部に伝送するので、同軸ケーブルをなくすことが
出来る。このため、外部ノイズの引き込みがなくなり、
S/Nを向上できる。また、人が同軸ケーブルに接触し
て火傷を負うことがなくなる。さらに、設置時に、同軸
ケーブルを引き回す必要がなくなる。
According to the MR device of the present invention, since the NMR signal received by the coil is transmitted to the information processing section outside the scan room by radio waves, the coaxial cable can be eliminated. Therefore, the external noise is not drawn in,
The S / N can be improved. In addition, a person does not get in contact with the coaxial cable and get burned. Further, it is not necessary to route the coaxial cable at the time of installation.

【図面の簡単な説明】[Brief description of drawings]

【図1】この発明の第1実施例によるMR装置の構成図
である。
FIG. 1 is a configuration diagram of an MR device according to a first embodiment of the present invention.

【図2】この発明の第2実施例によるMR装置の構成図
である。
FIG. 2 is a block diagram of an MR device according to a second embodiment of the present invention.

【図3】この発明の第3実施例によるMR装置の構成図
である。
FIG. 3 is a configuration diagram of an MR device according to a third embodiment of the present invention.

【図4】バードケージコイルの構成図である。FIG. 4 is a configuration diagram of a birdcage coil.

【図5】従来のMR装置の受信系の構成図である。FIG. 5 is a block diagram of a receiving system of a conventional MR device.

【符号の説明】[Explanation of symbols]

1,101,201 MR装置 2 コイル 2a,2b,2c サーフェイスコイル 3 発振器 4,4a,4b,4c デュアルゲートFET 5 送信アンテナ 6a,6b,6c 位相補償回路 7 合成器 8a,8b,8c ダイオード保護回路 9a,9b,9c ディレイ回路 21 受信アンテナ 22 復調器 23 情報処理部 R バイアス抵抗 E 電源 BC バードケージコイル Ea,Eb,Ec エレメント 1, 101, 201 MR device 2 coil 2a, 2b, 2c surface coil 3 oscillator 4, 4a, 4b, 4c dual gate FET 5 transmission antenna 6a, 6b, 6c phase compensation circuit 7 combiner 8a, 8b, 8c diode protection circuit 9a, 9b, 9c Delay circuit 21 Reception antenna 22 Demodulator 23 Information processing section R Bias resistance E Power supply BC Bird cage coil Ea, Eb, Ec element

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 受信コイルで受信したNMR信号で搬送
波を変調して被変調信号を生成する変調手段と、前記被
変調信号に基づいて電波を送信する電波送信手段と、前
記電波を受信する電波受信手段と、その受信した電波か
ら前記NMR信号を復調して取り出す復調手段とを具備
したことを特徴とするMR装置。
1. A modulation means for modulating a carrier wave with an NMR signal received by a receiving coil to generate a modulated signal, a radio wave transmitting means for transmitting a radio wave based on the modulated signal, and a radio wave for receiving the radio wave. An MR apparatus comprising: a receiving means and a demodulating means for demodulating and extracting the NMR signal from the received radio wave.
【請求項2】 異なる位置に設けられた複数の受信コイ
ルでそれぞれ受信したNMR信号の位相を揃えるように
各NMR信号を遅延させるNMR信号遅延手段と、前記
遅延した各NMR信号で搬送波をそれぞれ変調して被変
調信号をそれぞれ生成する変調手段と、前記複数の被変
調信号を合成した合成被変調信号に基づいて電波を送信
する電波送信手段と、前記電波を受信する電波受信手段
と、その受信した電波から前記各NMR信号を合成した
合成NMR信号を復調して取り出す復調手段とを具備し
たことを特徴とするMR装置。
2. An NMR signal delay means for delaying each NMR signal so that the phases of the NMR signals received by a plurality of receiving coils provided at different positions are aligned, and a carrier wave is modulated by each delayed NMR signal. Modulating means for respectively generating modulated signals, radio wave transmitting means for transmitting a radio wave based on a combined modulated signal obtained by combining the plurality of modulated signals, radio wave receiving means for receiving the radio waves, and reception thereof And a demodulation means for demodulating and extracting a synthesized NMR signal obtained by synthesizing the respective NMR signals from the radio wave.
【請求項3】 異なる位置に設けられた複数の受信コイ
ルでそれぞれ受信したNMR信号の位相を揃えて合成し
合成NMR信号を生成するNMR信号合成手段と、前記
合成NMR信号で搬送波を変調して被変調信号を生成す
る変調手段と、前記被変調信号に基づいて電波を送信す
る電波送信手段と、前記電波を受信する電波受信手段
と、その受信した電波から前記合成NMR信号を復調し
て取り出す復調手段とを具備したことを特徴とするMR
装置。
3. An NMR signal synthesizing means for synthesizing the NMR signals received by a plurality of receiving coils provided at different positions so that the phases thereof are aligned and synthesized, and a carrier is modulated by the synthesized NMR signals. Modulating means for generating a modulated signal, radio wave transmitting means for transmitting a radio wave based on the modulated signal, radio wave receiving means for receiving the radio wave, and demodulating and extracting the synthesized NMR signal from the received radio wave. MR comprising demodulation means
apparatus.
JP5008457A 1993-01-21 1993-01-21 Mr device Pending JPH06209922A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5008457A JPH06209922A (en) 1993-01-21 1993-01-21 Mr device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5008457A JPH06209922A (en) 1993-01-21 1993-01-21 Mr device

Publications (1)

Publication Number Publication Date
JPH06209922A true JPH06209922A (en) 1994-08-02

Family

ID=11693663

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5008457A Pending JPH06209922A (en) 1993-01-21 1993-01-21 Mr device

Country Status (1)

Country Link
JP (1) JPH06209922A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006048816A1 (en) * 2004-11-04 2006-05-11 Koninklijke Philips Electronics N.V. Rf receive coil assembly with individual digitizers and means for synchronization thereof
JP2007203036A (en) * 2006-01-06 2007-08-16 Toshiba Corp Magnetic resonance imaging device, coil system of magnetic resonance imaging device, and method for processing received signal in magnetic resonance imaging device
JP2010501294A (en) * 2006-08-28 2010-01-21 サニーブルック アンド ウィメンズ カレッジ ヘルス サイエンシーズ センター Open structure imager and coil system for magnetic resonance imaging
JP2011092553A (en) * 2009-10-30 2011-05-12 Toshiba Corp Magnetic resonance imaging apparatus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006048816A1 (en) * 2004-11-04 2006-05-11 Koninklijke Philips Electronics N.V. Rf receive coil assembly with individual digitizers and means for synchronization thereof
US7750635B2 (en) 2004-11-04 2010-07-06 Koninklijke Philips Electronics N.V. RF receive coil assembly with individual digitizers and means for synchronization thereof
JP2007203036A (en) * 2006-01-06 2007-08-16 Toshiba Corp Magnetic resonance imaging device, coil system of magnetic resonance imaging device, and method for processing received signal in magnetic resonance imaging device
JP2010501294A (en) * 2006-08-28 2010-01-21 サニーブルック アンド ウィメンズ カレッジ ヘルス サイエンシーズ センター Open structure imager and coil system for magnetic resonance imaging
JP2011092553A (en) * 2009-10-30 2011-05-12 Toshiba Corp Magnetic resonance imaging apparatus

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