JP4783556B2 - Mri用磁場生成器の中心磁場を調節するための方法及び装置 - Google Patents
Mri用磁場生成器の中心磁場を調節するための方法及び装置 Download PDFInfo
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- JP4783556B2 JP4783556B2 JP2004109822A JP2004109822A JP4783556B2 JP 4783556 B2 JP4783556 B2 JP 4783556B2 JP 2004109822 A JP2004109822 A JP 2004109822A JP 2004109822 A JP2004109822 A JP 2004109822A JP 4783556 B2 JP4783556 B2 JP 4783556B2
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- Japan
- Prior art keywords
- magnetic field
- yoke
- central
- magnet
- blocks
- 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.)
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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
- G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
- G01R33/387—Compensation of inhomogeneities
- G01R33/3873—Compensation of inhomogeneities using ferromagnetic bodies ; Passive shimming
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- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Description
但し、以下の制約を受ける:
−Imax ≦Ii- ≦0 式(2)
0≦Ii+ ≦Imax 式(3)
YL ≦Yj ≦YU 式(4)
BL ≦AX≦BU 式(5)。
12 板状ヨーク
14 柱状ヨーク
16 C字形ヨーク
18 磁石ブロック
20 磁極片基部
22 支持リング
24 磁極片
25 ギャップ
26 電子回路
28 表示装置
Claims (4)
- 磁場を変更する方法であって、
MRIシステム(10)の磁石の組立を終了した後に、前記MRIシステム(10)の中心磁場を測定して中心磁場値を求める工程と、
前記MRIシステム(10)の少なくとも1つの構成要素の温度を調整して、中心磁場を前記測定した値とは異なる値に変更する工程とを含み、
前記MRIシステム(10)が、
第1のヨーク(12)と、
該第1のヨーク上に配置された第1の中央組立体(30)を形成する複数の第1の磁石ブロック(18)と、
前記第1のヨークに対向する面を有する第2のヨーク(12)と、
該第2のヨーク上に配置され且つ前記第1の中央組立体と同じ形状を持つ第2の中央組立体(30)を形成する複数の第2の磁石ブロック(18)と、
前記第2の中央組立体の周縁で前記第2のヨークに取り付けられた第1組の磁石ブロック(32,34,36,38,40)とを含んでおり、
更に、前記測定した前記中心磁場値が所定の範囲にない場合、前記第2の中央組立体の周縁で前記第1組の磁石ブロック(32,34,36,38,40)を前記第2のヨークの前記対向する面に取り付けて、前記所定の範囲内となるように前記中心磁場を3.5パーセント以上強める工程を含んでおり、前記第1組の磁石ブロック(32,34,36,38,40)の各々が前記第2のヨーク(12)の前記対向する面上において、前記第2の中央組立体の周縁に適合する形状の矩形の形状を有している、
方法。 - 温度が調整される前記少なくとも1つの構成要素が磁石ブロック(18)であり、
前記MRIシステム(10)は更に、前記第1の中央組立体(30)の周縁で前記第1のヨーク(12)に取り付けられた第2組の磁石ブロック(32,34,36,38,40)を含んでおり、該第2組の磁石ブロックは前記第1組の磁石ブロックとは異なる配置構成である、請求項1記載の方法。 - 前記第1組の磁石ブロック(32,34,36,38,40)は一組の半ブロック(32,34)を含んでいる、請求項1又は2に記載の方法。
- 前記MRIシステム(10)は更に、前記第1組に隣接して前記第2のヨーク(12)上に配置された第2組の半ブロック(32,34)を含んでいる、請求項3記載の方法。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/407,887 US6844801B2 (en) | 2003-03-21 | 2003-04-04 | Methods and apparatus for adjusting center magnetic field of a magnetic field generator for MRI |
US10/407,887 | 2003-04-04 |
Publications (3)
Publication Number | Publication Date |
---|---|
JP2004305744A JP2004305744A (ja) | 2004-11-04 |
JP2004305744A5 JP2004305744A5 (ja) | 2007-05-17 |
JP4783556B2 true JP4783556B2 (ja) | 2011-09-28 |
Family
ID=32869178
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2004109822A Expired - Fee Related JP4783556B2 (ja) | 2003-04-04 | 2004-04-02 | Mri用磁場生成器の中心磁場を調節するための方法及び装置 |
Country Status (4)
Country | Link |
---|---|
US (1) | US6844801B2 (ja) |
EP (1) | EP1467220A3 (ja) |
JP (1) | JP4783556B2 (ja) |
CN (1) | CN100536769C (ja) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100418475C (zh) * | 2004-07-01 | 2008-09-17 | 日立金属株式会社 | 磁场产生装置 |
US20070285197A1 (en) * | 2006-06-08 | 2007-12-13 | General Electric Company | Method for disassembling a magnetic field generator |
CA2704674A1 (en) * | 2007-11-06 | 2009-05-14 | T2 Biosystems, Inc. | Small magnet and rf coil for magnetic resonance relaxometry |
CN104459584B (zh) * | 2009-12-02 | 2018-03-20 | 纳纳利塞斯公司 | 用于产生均匀磁场的方法和装置 |
CN106556813B (zh) * | 2016-11-25 | 2021-09-24 | 上海辰光医疗科技股份有限公司 | 一种磁共振系统中主动匀场线圈的线性混合优化方法 |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS60189905A (ja) * | 1984-03-09 | 1985-09-27 | Mitsubishi Electric Corp | 高均一磁界発生装置 |
JPH01283905A (ja) * | 1988-05-11 | 1989-11-15 | Hitachi Medical Corp | Mri装置用均一磁場の偏位方法及びそれを用いた静磁場発生装置 |
JPH03131234A (ja) * | 1989-07-07 | 1991-06-04 | Sumitomo Special Metals Co Ltd | Mri用磁界発生装置 |
JPH0394732A (ja) * | 1989-09-08 | 1991-04-19 | Sumitomo Special Metals Co Ltd | Mri用磁界発生装置 |
JPH05152120A (ja) * | 1991-11-29 | 1993-06-18 | Shin Etsu Chem Co Ltd | 磁場発生装置及び磁場均一度調整方法 |
US5668516A (en) | 1995-12-29 | 1997-09-16 | General Electric Company | Simplified active shield superconducting magnet assembly for magnetic resonance imaging |
JP3705861B2 (ja) * | 1996-03-21 | 2005-10-12 | 株式会社日立メディコ | 超電導磁石装置及びその着磁調整方法 |
JP2953659B1 (ja) * | 1998-08-06 | 1999-09-27 | 住友特殊金属株式会社 | Mri用磁界発生装置およびその組立方法並びにそれに用いる磁石ユニットの組立方法 |
US6358582B1 (en) | 1998-11-19 | 2002-03-19 | General Electric Company | Laminated composite shell assembly for magnet applications |
US5999076A (en) | 1998-12-30 | 1999-12-07 | General Electric Company | Magnetic resonance imaging passively shimmed superconducting magnet assembly |
KR100319923B1 (ko) * | 1999-05-10 | 2002-01-09 | 윤종용 | 자기공명영상장치용 자기장 발생 장치 |
JP4123649B2 (ja) * | 1999-08-12 | 2008-07-23 | 日立金属株式会社 | 磁界発生装置およびその組立方法 |
US6252405B1 (en) | 1999-11-15 | 2001-06-26 | General Electric Company | Temperature compensated NMR magnet and method of operation therefor |
DE60041792D1 (de) * | 1999-11-16 | 2009-04-23 | Hitachi Metals Ltd | Magnetfeldgenerator mit einer Polstückeinheit |
JP3559262B2 (ja) * | 2000-10-06 | 2004-08-25 | 株式会社Neomax | 磁界調整用装置、磁界調整方法および記録媒体 |
JP4338166B2 (ja) * | 2001-03-13 | 2009-10-07 | 信越化学工業株式会社 | Mri用磁場発生装置 |
US6504461B2 (en) | 2001-03-26 | 2003-01-07 | General Electric Company | Open magnet with recessed field shaping coils |
JP2003024296A (ja) * | 2001-07-04 | 2003-01-28 | Ge Medical Systems Global Technology Co Llc | 静磁界調整方法およびmri装置 |
-
2003
- 2003-04-04 US US10/407,887 patent/US6844801B2/en not_active Expired - Fee Related
-
2004
- 2004-03-30 EP EP04251880A patent/EP1467220A3/en not_active Ceased
- 2004-04-01 CN CNB2004100321494A patent/CN100536769C/zh not_active Expired - Fee Related
- 2004-04-02 JP JP2004109822A patent/JP4783556B2/ja not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
EP1467220A2 (en) | 2004-10-13 |
CN100536769C (zh) | 2009-09-09 |
JP2004305744A (ja) | 2004-11-04 |
EP1467220A3 (en) | 2005-10-26 |
US20040196126A1 (en) | 2004-10-07 |
US6844801B2 (en) | 2005-01-18 |
CN1535654A (zh) | 2004-10-13 |
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