WO2003082106A1 - Aimant permanent pour resonance magnetique - Google Patents

Aimant permanent pour resonance magnetique Download PDF

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Publication number
WO2003082106A1
WO2003082106A1 PCT/CN2003/000229 CN0300229W WO03082106A1 WO 2003082106 A1 WO2003082106 A1 WO 2003082106A1 CN 0300229 W CN0300229 W CN 0300229W WO 03082106 A1 WO03082106 A1 WO 03082106A1
Authority
WO
WIPO (PCT)
Prior art keywords
yoke
permanent magnet
magnet
magnetic resonance
magnetic
Prior art date
Application number
PCT/CN2003/000229
Other languages
English (en)
French (fr)
Other versions
WO2003082106A8 (fr
Inventor
Shengqian Xiao
Shijie Zhao
Guangran Chen
Original Assignee
Shenyang Neusoft Bopu Nmr Tech Co., 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 Shenyang Neusoft Bopu Nmr Tech Co., Ltd. filed Critical Shenyang Neusoft Bopu Nmr Tech Co., Ltd.
Priority to AU2003227173A priority Critical patent/AU2003227173A1/en
Priority to US10/509,573 priority patent/US7084632B2/en
Priority to EP03714628A priority patent/EP1491138A4/en
Publication of WO2003082106A1 publication Critical patent/WO2003082106A1/zh
Publication of WO2003082106A8 publication Critical patent/WO2003082106A8/zh

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Classifications

    • 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
    • G01R33/383—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using permanent magnets
    • 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
    • G01R33/3806—Open magnet assemblies for improved access to the sample, e.g. C-type or U-type magnets

Definitions

  • the invention belongs to the technical field of medical equipment, and particularly relates to a permanent magnet for medical diagnostic magnetic resonance imaging. Background technique
  • Magnetic resonance imaging equipment is the latest medical diagnostic equipment developed in the 1980s. It is the most advanced clinical diagnostic equipment for the early detection and diagnosis of early cancer and many other diseases. Magnet is one of the key core devices of magnetic resonance imaging equipment. Its performance is directly related to the signal-to-noise ratio of the magnetic resonance equipment system, and therefore determines the image quality to a certain extent. Permanent magnets have a series of advantages such as simple structure, no additional equipment, easy maintenance, small range of surrounding stray magnetic fields, safe and reliable operation, and low cost. Therefore, permanent magnet magnetic resonance imaging equipment is increasingly being Industry attaches great importance.
  • the present invention provides a two-pillar open C-type permanent magnet magnetic resonance magnet.
  • the invention consists of a yoke, a magnetic material, a pole, an eddy current disc, a shim ring, and a gradient coil.
  • the yoke of the present invention is integrally cast, and adopts an integral structure of c-type two-pillar open type.
  • the magnetic material is bonded to the yoke, the pole is stuck to the magnetic material, the eddy current disc is stuck to the pole, the gradient coil and the shim
  • the rings are fixed to the poles with screws, the coils are inside, the hook field rings are outside, and the shim ring is composed of several arc-shaped segments, and each segment is fixed to the poles to form a ring.
  • the magnet of the present invention is an integrally cast c-type two-pillar type open type, which has a high degree of openness, simpler operation and more comfortable operation. The overall shape is lively and the lines are smooth.
  • the magnetic circuit structure adopts computer two-dimensional and three-dimensional simulation design.
  • the magnetic materials are all advanced homogeneous neodymium-iron-boron permanent magnet materials. A series of high-tech and technological measures have been used. This ensures good uniformity and stability, and basically eliminates the eddy current effect, and the range of stray magnetic fields is small.
  • the yoke part of the present invention adopts integral casting, and adopts a low carbon content material with good magnetic permeability. The material is uniform. Through two annealing treatments, the internal grains of the yoke are uniform and consistent, and the internal stress is completely eliminated.
  • Magnetic particle and ultrasonic flaw detection eliminates various casting defects, maximizes the parallelism of the upper and lower yokes, and greatly improves the mechanical strength of the magnet frame, thereby ensuring the uniformity of the magnetic field and the smoothness of the magnetic circuit.
  • the shape of the iron frame adopts a streamlined design, more in line with the requirements of the magnetic circuit design principle of the magnet, and has the characteristics of light weight and low magnetic leakage. At the same time, it has the characteristics of beautiful appearance.
  • the magnet adopts high-performance neodymium-iron-boron magnetic material, which further improves the uniformity of the magnet, and the eddy current effect often found in permanent magnets is basically eliminated. Because the basic field is good, the shimming is simple. BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a schematic diagram of the overall structure of the present invention
  • FIG. 2 is a side view of FIG. 1.
  • the present invention is composed of a yoke 1, a magnetic material 2, a pole 3, an eddy current disc 4, a shim ring 5, and a gradient coil 6.
  • the yoke 1 adopts a monolithic structure and is a C-type two-pillar jack-up type.
  • the magnetic material is adhered to the yoke 1, the pole 3 is adhered to the magnetic material 2, the eddy current plate 4 is adhered to the pole 3, and the gradient coil 6 and the shim ring 5 are respectively fixed to the pole 3 with screws.
  • the technical indicators of the present invention are as follows:

Landscapes

  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)

Description

两立柱开放式 C型永磁型磁共振磁体 技术领域
本发明属于医疗器械技术领域， 特别涉及一种医疗诊断磁共振成像用永磁 磁体。 背景技术
磁共振成像设备是八十年代最新发展的医疗诊断设备， 是当今发现和诊断 早期癌症及其它多种疾病最先进的临床诊断设备。 磁体是磁共振成像设备的关 键核心设备之一， 它的性能直接关系到磁共振设备***的信噪比， 因而在一定 程度上决定着图像的质量。 由于永磁磁体具有结构简单无附加设备， 维护简便， 周围杂散磁场范围小， 运行安全可靠且成本低廉等一系列优点， 因此永磁型磁 共振成像设备越来越受到国内外科技界、 医学界的高度重视。
但是传统的永磁型厢式磁体采用铁氧体磁性材料的缺点是场强低、 重量 重、 体积大、 封闭且实用性差。 早期 3000 高斯磁体重达 100 吨， 对后期磁体 运输、 安装带来极大不便。 由于高磁能积、 体积小、 一致性好的新型磁性材料 钕铁硼的问世， 世界各国都对低场永磁磁共振磁体的研制和开发加大了投入， 近年来出现了所谓幵放式 (OPEN 型)磁体， 这种磁体的优点是病人位于半敞幵 的检查床上不会产生通常 MRI受检者常有的恐惧心理， 易为儿童或其它焦躁型 患者所接受， 另外它会一改病人仰卧或俯卧接受 MRI检査的先例， 使病人取坐 姿检查某些部位 (如四肢等)， 并为 MRI开展介入治疗提供了可能。 因此该系列 磁体的发展速度很快， 各国公司均推出了稳定的产品投放市场。 由于具有价格 低廉等优点， 市场占有率呈逐年上升趋势。 但由于上述产品在整体结构上均采 用分体式拼装结构， 磁轭铁部分由多部分组成， 在加工和装配中无法保证磁体 上下轭铁的平行度， 因此使磁体的指标受到了一定的影响， 特别是增加了机械 强度方面的隐患， 同时影响了磁路的均匀流畅。 发明内容
针对现有磁共振磁体磁轭铁由多部分拼装， 影响磁体指标和磁路均匀流畅 的问题， 本发明提供一种两立柱开放式 C型永磁型磁共振磁体。
本发明由轭铁、 磁性材料、 极头、 涡流盘、 匀场环、 梯度线圈组成。
本发明的轭铁整体铸造而成， 采用整体结构 c型两立柱开放式， 磁性材 料粘结在轭铁上， 极头粘在磁性材料上， 涡流盘粘在极头上， 梯度线圈和匀场 环分别用螺钉固定在极头上， 线圈在里， 勾场环在外， 匀场环由若干弧形段组 成， 各段分别固定在极头上， 组成环状。 本发明磁体为整体铸造 c型两立柱型开放式， 开放度高、 操作更为 简便、 舒适。 整体造型活泼、 线条流畅， 磁路结构采用计算机二维和三维模拟 设计， 磁性材料全部采用先进的同质钕铁硼永磁材料运用了一系列高新技术和 工艺措施。 从而保证了良好的均匀性和稳定性并基本销除了涡流效应， 杂散磁 场范围小。 本发明轭铁部分采取整体铸造， 采用导磁性好的低含碳量材质， 材 质均匀， 通过两次退火处理， 使轭铁内部晶粒均匀、 一致， 内应力得到完全的 消除， 通过对铸件的磁粉和超声波探伤， 消除了各种铸造缺陷， 最大限度的保 证了上下轭铁的平行度， 使磁体机架的机械强度大幅度提高， 从而保证了磁场 的均匀度和磁路的流畅， 同时轭铁框架的外形采取了流线型设计， 更符合磁体 的磁路设计原理要求， 具有重量轻、 漏磁小等特点。 同时具有外形美观大方的 特点。 本磁体采用了高性能钕铁硼磁性材料， 使磁体的均勾性进一步得到了提 高， 永磁体常有的涡流效基本消除， 由于基础场良好， 所以匀场简易。 附图说明
图 1为本发明的整体结构示意图；
图 2为图 1的侧视图。
图中： 1轭铁， 2磁性材料， 3极头， 4涡流盘， 5匀场环， 6梯度线圈。 具体实施方式
如图 1所示， 本发明由轭铁 1、 磁性材料 2、 极头 3、 涡流盘 4、 匀 场环 5和与梯度线圈 6组成。 轭铁 1采用整体式结构， 为 C型两立柱幵放式。 磁性材料粘结在轭铁 1上， 极头 3粘在磁性材料 2上， 涡流盘 4粘在极头 3上， 梯度线圈 6和匀场环 5分别用螺钉固定在极头 3上。 本发明的技术指标如下表：
2300高斯 3500高斯
磁体强度 230005+气％ 350005+气％ 磁场方向 垂 直 垂 直
气隙高度 525mm 525隱
磁性材料 NdFeB NdFeB
结 构 开 放 开 放
5Gs线 ^2. 2m 2. 2m
磁场均匀度 30DSV中 20ppm 30DSV中 20ppm 匀场方式 无 源 无 源
稳定性 6ppm 1 h 6ppm 1 h
运行条件 21 °C ± rC 21 °C土 1 °C

Claims

权 利 要 求
1、 一种两立柱开放式 C型永磁型磁共振磁体， 由轭铁、 磁性材料、 极 头、 涡流盘、 匀场环、 梯度线圈构成， 其特征在于该磁体轭铁的形状和结构为
C型两立柱开放式整体结构。
2、 根据权利要求 1所述的两立柱开放式 C型永磁型磁共振磁体， 其特 征在于其中所述轭铁为整体铸造而成。
3、 根据权利要求 1或 2所述的两立柱开放式 C型永磁型磁共振磁体， 其特征在于所述轭铁部分为导磁性好的低含碳量材料。
4、 根据权利要求 1到 3中的任何一个权利要求所述的两立柱开放式 C 型永磁型磁共振磁体， 其特征在于其中的轭铁部分经过两次退火处理。
5、 根据权利要求 1到 4中的任何一个权利要求所述的两立柱开放式 C 型永磁型磁共振磁体， 其特征在于所述轭铁部分的外形采用流线形设计。
PCT/CN2003/000229 2002-04-01 2003-03-28 Aimant permanent pour resonance magnetique WO2003082106A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU2003227173A AU2003227173A1 (en) 2002-04-01 2003-03-28 A permanent magnet for magnet resonance
US10/509,573 US7084632B2 (en) 2002-04-01 2003-03-28 Permanent magnet for magnet resonance
EP03714628A EP1491138A4 (en) 2002-04-01 2003-03-28 PERMANENT MAGNET FOR MAGNETIC RESONANCE

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN02210965.X 2002-04-01
CN02210965U CN2542205Y (zh) 2002-04-01 2002-04-01 两立柱开放式c型永磁型磁共振磁体

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WO2003082106A1 true WO2003082106A1 (fr) 2003-10-09
WO2003082106A8 WO2003082106A8 (fr) 2004-11-18

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EP (1) EP1491138A4 (zh)
CN (1) CN2542205Y (zh)
AU (1) AU2003227173A1 (zh)
WO (1) WO2003082106A1 (zh)

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CN100569180C (zh) * 2006-11-22 2009-12-16 中国科学院电工研究所 一种减小磁共振成像磁体涡流的装置
CN102677918A (zh) * 2011-03-17 2012-09-19 上海爱立峰医疗科技有限公司 一体式磁共振医疗室
KR101424552B1 (ko) 2012-09-05 2014-07-31 삼성전자 주식회사 자기공명영상장치 및 그 제조방법
CN103901372B (zh) * 2013-11-29 2016-10-05 沈阳东软波谱磁共振技术有限公司 一种永磁体及其机架
CN103860178B (zh) * 2014-03-21 2016-04-06 沈阳中北真空磁电科技有限公司 一种用于核磁共振成像仪的永磁体
CN103892834B (zh) * 2014-03-21 2016-05-25 沈阳中北真空磁电科技有限公司 一种用于核磁共振成像仪的永磁体

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Also Published As

Publication number Publication date
AU2003227173A1 (en) 2003-10-13
EP1491138A4 (en) 2005-06-22
CN2542205Y (zh) 2003-04-02
AU2003227173A8 (en) 2003-10-13
EP1491138A1 (en) 2004-12-29
WO2003082106A8 (fr) 2004-11-18

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