JPH0350302U - - Google Patents
Info
- Publication number
- JPH0350302U JPH0350302U JP11232889U JP11232889U JPH0350302U JP H0350302 U JPH0350302 U JP H0350302U JP 11232889 U JP11232889 U JP 11232889U JP 11232889 U JP11232889 U JP 11232889U JP H0350302 U JPH0350302 U JP H0350302U
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- pair
- plate yokes
- permanent magnet
- yokes
- 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.)
- Granted
Links
- 230000005415 magnetization Effects 0.000 claims 1
Landscapes
- Magnetic Resonance Imaging Apparatus (AREA)
Description
第１図はこの考案の一実施例を示す磁界発生装
置の斜視説明図である。第２図は磁界発生装置の
空〓外のＺ軸方向の磁界強度を測定した結果を示
すグラフである。第３図は従来の磁界発生装置を
示す縦断説明図である。
１……永久磁石構成体、２……磁極片、３……
環状突起部、４，５……板状継鉄、６……柱状継
鉄、７……空〓、８……シールド用磁石。
FIG. 1 is a perspective explanatory view of a magnetic field generating device showing an embodiment of this invention. FIG. 2 is a graph showing the results of measuring the magnetic field strength in the Z-axis direction outside the sky of the magnetic field generator. FIG. 3 is a longitudinal sectional view showing a conventional magnetic field generating device. 1...Permanent magnet structure, 2...Magnetic pole piece, 3...
Annular protrusion, 4, 5... Plate yoke, 6... Column yoke, 7... Sky, 8... Shielding magnet.
Claims (1)
を一対の板状継鉄に設け、さらに板状継鉄間の板
状継鉄で磁気的結合し、各永久磁石構成体の空〓
対向面に磁極片を固着し、該空〓に磁界を発生さ
せるＭＲＩ用磁界発生装置において、 一対の板状継鉄の少なくとも一方の外向面に、
漏洩磁界の方向と逆の方向の磁化を有する複数の シールド用磁石を着設しことを特徴とするＭＲ
Ｉ用磁界発生装置。[Claims for Utility Model Registration] A pair of permanent magnet structures facing each other forming an air space are provided in a pair of plate yokes, and further magnetically coupled by plate yokes between the plate yokes, The sky of permanent magnet structure
In an MRI magnetic field generation device in which magnetic pole pieces are fixed to opposing surfaces and a magnetic field is generated in the air, at least one outward facing surface of a pair of plate yokes is provided with
MR characterized in that a plurality of shielding magnets having magnetization in a direction opposite to the direction of the leakage magnetic field are attached.
Magnetic field generator for I.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11232889U JPH0541530Y2 (en) | 1989-09-25 | 1989-09-25 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11232889U JPH0541530Y2 (en) | 1989-09-25 | 1989-09-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0350302U true JPH0350302U (en) | 1991-05-16 |
| JPH0541530Y2 JPH0541530Y2 (en) | 1993-10-20 |
Family
ID=31660777
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11232889U Expired - Lifetime JPH0541530Y2 (en) | 1989-09-25 | 1989-09-25 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0541530Y2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004502479A (en) * | 2000-07-06 | 2004-01-29 | マルコニ メディカル システムズ フィンランド インコーポレイテッド | MRI magnet with small peripheral magnetic field |
| WO2007004672A1 (en) * | 2005-07-06 | 2007-01-11 | Hitachi, Ltd. | Magnetic shield room and magnetic resonance imaging system having the magnetic shield room |
| JP2012176189A (en) * | 2011-02-28 | 2012-09-13 | Ge Medical Systems Global Technology Co Llc | Stray magnetic field reduction structure, magnet room, and stray magnetic field reduction method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6642826B1 (en) * | 2000-08-09 | 2003-11-04 | Sumitomo Special Metals Co., Ltd. | Magnetic field generator and assembling method thereof |
-
1989
- 1989-09-25 JP JP11232889U patent/JPH0541530Y2/ja not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004502479A (en) * | 2000-07-06 | 2004-01-29 | マルコニ メディカル システムズ フィンランド インコーポレイテッド | MRI magnet with small peripheral magnetic field |
| WO2007004672A1 (en) * | 2005-07-06 | 2007-01-11 | Hitachi, Ltd. | Magnetic shield room and magnetic resonance imaging system having the magnetic shield room |
| JP2012176189A (en) * | 2011-02-28 | 2012-09-13 | Ge Medical Systems Global Technology Co Llc | Stray magnetic field reduction structure, magnet room, and stray magnetic field reduction method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0541530Y2 (en) | 1993-10-20 |
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