JP4128150B2 - 任意波形発生器を用いたラジオ波送信回路およびそれを用いた核磁気共鳴装置 - Google Patents
任意波形発生器を用いたラジオ波送信回路およびそれを用いた核磁気共鳴装置 Download PDFInfo
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- JP4128150B2 JP4128150B2 JP2004082535A JP2004082535A JP4128150B2 JP 4128150 B2 JP4128150 B2 JP 4128150B2 JP 2004082535 A JP2004082535 A JP 2004082535A JP 2004082535 A JP2004082535 A JP 2004082535A JP 4128150 B2 JP4128150 B2 JP 4128150B2
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- magnetic resonance
- nuclear magnetic
- radio wave
- wave transmission
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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
- G01R33/3607—RF waveform generators, e.g. frequency generators, amplitude-, frequency- or phase modulators or shifters, pulse programmers, digital to analog converters for the RF signal, means for filtering or attenuating of the RF signal
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- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Description
A(f)=1(f1<f<f2)、
A(f)=0(f<f1、またはf>f2)、
位相はN分割してスクランブルすると位相Pは以下のように表せる。
―f1)/N, k=1…N)
ここで、ramdom (k)は種整数kで発生する0から1の間の実数をとる乱数である。A(f)とP(f)を用いると周波数領域の励起用スペクトルS(f)を複素数で表すことができ、S(f)=A(f)exp(P(f))と表せる。
これを任意波形発生器AWG1,AWG2で発生させれば良い。得られたデータを任意波形発生器AWG1,AWG2への入力データとして用いる。以上のプロセスで自由な励起パルスをユーザーは作り出すことができる。
Claims (6)
- 入力された異なる波形データを記憶する2つのメモリと、これらメモリの波形データを所定の周波数に同期してD/A変換してそれぞれ出力波を発生する2つの波形発生器を有し、NMR測定の基準となる中心周波数を発振する局部発振器と、前記2つの波形発生器の出力と前記局部発振器の出力を変調する2つのミキサーと、これら2つのミキサーの出力を結合する結合器を有するIQモジュレーターを備え、前記IQモジュレーターは、前記局部発振器からの電磁波を前記2つの波形発生器の出力波によって変調することを特徴とする核磁気共鳴用ラジオ波送信回路。
- 請求項1において、前記IQモジュレーターは、前記2つのミキサーと、前記局部発振器からの電磁波の位相を90度ずらす位相シフターを有し、前記ミキサーの一方には前記局部発振器の出力が入力され、他方には前記位相シフターの出力が入力される核磁気共鳴用ラジオ波送信回路。
- 請求項1において、前記2つのメモリの一方には所定周波数に対応した振幅データを、他方には前記振幅データの位相をランダムにかき混ぜた位相スクランブルデータ記憶する核磁気共鳴用ラジオ波送信回路。
- 請求項1〜3のいずれかにおいて、前記波形発生器に入力する波形データとして逆フーリエ変換した周波数データを用いる核磁気共鳴用ラジオ波送信回路。
- 請求項4において、逆フーリエ変換される周波数データの元となるデータとして、測定試料の実スペクトルを参照してつくられたデータ、もしくは前記実スペクトルを加工したデータを用いる核磁気共鳴用ラジオ波送信回路。
- 請求項1〜5のいずれか一つに記載された核磁気共鳴用ラジオ波送信回路の出力が与えられるプローブコイルを備えた核磁気共鳴装置。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004082535A JP4128150B2 (ja) | 2004-03-22 | 2004-03-22 | 任意波形発生器を用いたラジオ波送信回路およびそれを用いた核磁気共鳴装置 |
US11/058,356 US7132830B2 (en) | 2004-03-22 | 2005-02-16 | Radiofrequency wave transmission circuit using arbitrary waveform generator and NMR apparatus using the same |
DE102005007610A DE102005007610B4 (de) | 2004-03-22 | 2005-02-18 | Einen Generator für beliebige Wellenformen verwendende Hochfrequenzwellensendeschaltung und dieselbe verwendende NMR-Vorrichtung |
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---|---|---|---|
JP2004082535A JP4128150B2 (ja) | 2004-03-22 | 2004-03-22 | 任意波形発生器を用いたラジオ波送信回路およびそれを用いた核磁気共鳴装置 |
Publications (2)
Publication Number | Publication Date |
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JP2005261831A JP2005261831A (ja) | 2005-09-29 |
JP4128150B2 true JP4128150B2 (ja) | 2008-07-30 |
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Application Number | Title | Priority Date | Filing Date |
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JP2004082535A Expired - Fee Related JP4128150B2 (ja) | 2004-03-22 | 2004-03-22 | 任意波形発生器を用いたラジオ波送信回路およびそれを用いた核磁気共鳴装置 |
Country Status (3)
Country | Link |
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US (1) | US7132830B2 (ja) |
JP (1) | JP4128150B2 (ja) |
DE (1) | DE102005007610B4 (ja) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7595641B1 (en) * | 2008-03-07 | 2009-09-29 | Varian, Inc. | Electronic NMR reference signal systems and methods |
CN103852648B (zh) * | 2014-03-20 | 2016-07-06 | 西安电子科技大学 | 获取空间电磁强度数据的方法 |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS6296557U (ja) * | 1985-12-06 | 1987-06-19 | ||
NL8601002A (nl) * | 1986-04-21 | 1987-11-16 | Philips Nv | Werkwijze en inrichting voor het bepalen van een kernmagnetisatieverdeling in deel van een lichaam. |
NL8701195A (nl) * | 1987-05-19 | 1988-12-16 | Philips Nv | M.r.i.-inrichting met digitale zender/ontvanger. |
US5457386A (en) * | 1991-11-26 | 1995-10-10 | Hitachi, Ltd. | Multiple-coil adopting a quadrature detection method applied thereto and a signal processing circuit employing the same in an MRI apparatus in a vertical magnetic system |
JP3452395B2 (ja) * | 1994-05-24 | 2003-09-29 | 株式会社日立メディコ | 磁気共鳴画像診断装置 |
EP0742647A4 (en) * | 1994-11-30 | 1999-11-24 | Matsushita Electric Ind Co Ltd | RECEPTION CIRCUIT |
US5909460A (en) * | 1995-12-07 | 1999-06-01 | Ericsson, Inc. | Efficient apparatus for simultaneous modulation and digital beamforming for an antenna array |
US6259747B1 (en) * | 1997-03-20 | 2001-07-10 | Telefonaktiebolaget L M Ericsson (Publ) | IQ modulator, and associated method |
JPH1155036A (ja) * | 1997-08-04 | 1999-02-26 | Kokusai Electric Co Ltd | 周波数発生回路 |
JP2000261403A (ja) * | 1999-03-04 | 2000-09-22 | Sony Corp | 送信装置および方法、並びに提供媒体 |
US6515622B1 (en) * | 2000-06-13 | 2003-02-04 | Hrl Laboratories, Llc | Ultra-wideband pulse coincidence beamformer |
US6504505B1 (en) * | 2000-10-30 | 2003-01-07 | Hughes Electronics Corporation | Phase control network for active phased array antennas |
JP3884244B2 (ja) * | 2001-07-04 | 2007-02-21 | ジーイー・メディカル・システムズ・グローバル・テクノロジー・カンパニー・エルエルシー | Rf送信回路およびmri装置 |
JP2003209463A (ja) * | 2002-01-15 | 2003-07-25 | Murata Mfg Co Ltd | 周波数変換器およびそれを用いた周波数可変発振器およびそれらを用いた電子装置 |
US7397865B2 (en) * | 2003-04-02 | 2008-07-08 | Agilent Technologies, Inc. | Systems and methods of using IQ modulation for calibration or measurement |
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2004
- 2004-03-22 JP JP2004082535A patent/JP4128150B2/ja not_active Expired - Fee Related
-
2005
- 2005-02-16 US US11/058,356 patent/US7132830B2/en not_active Expired - Fee Related
- 2005-02-18 DE DE102005007610A patent/DE102005007610B4/de not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
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JP2005261831A (ja) | 2005-09-29 |
US20050206384A1 (en) | 2005-09-22 |
DE102005007610A1 (de) | 2005-12-01 |
DE102005007610B4 (de) | 2012-12-13 |
US7132830B2 (en) | 2006-11-07 |
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