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公开(公告)号：US06215383B1
公开(公告)日：2001-04-10
申请号：US09419237
申请日：1999-10-15
IPC分类号： H01F500
CPC分类号： G01R33/421 , G01R33/3815
摘要： A magnet, such as a closed, superconductive, magnetic-resonance-imaging (MRI) magnet includes a main coil, a magnetizable article, and a shielding coil positioned radially outward from the main coil and magnetizable article. Two magnetizable members are positioned radially outward from the main coil and magnetizable article and radially inward from the shielding coil to supplement the strength, and increase the homogeneity of, the magnetic field created, at least in part, by the main coil and magnetizable article and to supplement the shielding provided, at least in part, by the shielding coil.
摘要翻译： 诸如封闭的超导磁共振成像（MRI）磁体的磁体包括主线圈，可磁化制品和位于主线圈和可磁化制品的径向外侧的屏蔽线圈。 两个可磁化构件从主线圈和可磁化制品径向向外定位并且从屏蔽线圈径向向内定位以补充强度，并且增加至少部分由主线圈和可磁化制品产生的磁场的均匀性，以及 以补充至少部分由屏蔽线圈提供的屏蔽。
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公开(公告)号：US5874882A
公开(公告)日：1999-02-23
申请号：US26390
申请日：1998-02-19
IPC分类号： H01F27/36 , G01R33/38 , G01R33/3815 , G01R33/421 , H01F6/00 , H05K9/00 , H01F5/00
CPC分类号： G01R33/3806 , G01R33/421 , G01R33/3815
摘要： An open superconductive magnet useful in magnetic resonance imaging (MRI) applications. The magnet has two spaced apart assemblies, wherein each assembly has a magnetizable pole piece and a magnetizable ring radially spaced outwardly apart from, and at least partially longitudinally overlapping, the pole piece. A superconductive main coil is positioned radially between the pole piece and the ring. A superconductive shielding coil is positioned radially outward from the superconductive main coil and longitudinally outward from the longitudinally outer end of the ring.
摘要翻译： 用于磁共振成像（MRI）应用的开放超导磁体。 磁体具有两个间隔开的组件，其中每个组件具有可磁化磁极片和可磁化环，该可磁化环径向间隔开并且至少部分纵向重叠的极片。 超导主线圈径向地位于极片和环之间。 超导屏蔽线圈从超导主线圈径向向外定位，并且从环的纵向外端纵向向外定位。
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公开(公告)号：US06215384B1
公开(公告)日：2001-04-10
申请号：US09419238
申请日：1999-10-15
IPC分类号： H01F500
CPC分类号： G01R33/421 , G01R33/3815
摘要： A magnet, such as a closed, superconductive, magnetic-resonance-imaging (MRI) magnet includes a main coil, a correction coil, and a shielding coil positioned radially outward from the main and correction coils. Two magnetizable members are positioned radially outward from the main and correction coils and radially inward from the shielding coil to shorten the magnet, to supplement the strength, and increase the homogeneity of, the magnetic field created, at least in part, by the main and correction coils and to supplement the shielding provided, at least in part, by the shielding coil.
摘要翻译： 诸如闭合的超导磁共振成像（MRI）磁体的磁体包括主线圈，校正线圈和从主矫正线圈和校正线圈径向向外定位的屏蔽线圈。 两个可磁化构件从主和校正线圈径向向外定位并且从屏蔽线圈径向向内定位以缩短磁体，以补充强度，并且增加至少部分地由主体和主体产生的磁场的均匀性， 并且补充至少部分由屏蔽线圈提供的屏蔽。
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公开(公告)号：US06218923B1
公开(公告)日：2001-04-17
申请号：US09419236
申请日：1999-10-15
IPC分类号： H01F500
CPC分类号： G01R33/3873 , G01R33/3815 , G01R33/421
摘要： A magnet, such as a closed, superconductive, magnetic-resonance-imaging (MRI) magnet, includes a main coil and includes a shielding coil positioned radially outward from the main coil. A magnetizable member is positioned radially outward from the main coil and radially inward from the shielding coil to supplement the strength, and increase the homogeneity of, the magnetic field created, at least in part, by the main coil and to supplement the shielding provided, at least in part, by the shielding coil.
摘要翻译： 诸如封闭的超导磁共振成像（MRI）磁体的磁体包括主线圈并且包括从主线圈径向向外定位的屏蔽线圈。 可磁化构件从主线圈径向向外定位并且从屏蔽线圈径向向内设置以补充强度，并且增加至少部分由主线圈产生的磁场的均匀性，并补充所提供的屏蔽， 至少部分地由屏蔽线圈。
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公开(公告)号：US6157279A
公开(公告)日：2000-12-05
申请号：US419014
申请日：1999-10-13
申请人： Evangelos Trifon Laskaris , Michael Anthony Palmo , Bu-Xin Xu , Michele Dollar Ogle , Bruce Campbell Amm
发明人： Evangelos Trifon Laskaris , Michael Anthony Palmo , Bu-Xin Xu , Michele Dollar Ogle , Bruce Campbell Amm
IPC分类号： G01R33/421 , A61B5/055 , G01R33/38 , G01R33/381 , G01R33/3815 , H01F6/00 , H01F7/20 , H01H5/00
CPC分类号： G01R33/421 , G01R33/3806 , G01R33/3815
摘要： An open magnet useful in magnetic resonance imaging (MRI) applications. The magnet has two spaced-apart assemblies. Each assembly has a shielding coil located longitudinally outward from a main coil, a magnetizable member not carrying an electric current and spaced apart from and proximate the main and shielding coils, and a magnetizable pole piece spaced apart from the magnetizable member: The method of the invention generates a magnetic field in a first area between the two assemblies while shielding a second area not between the two assemblies from a stray magnetic field by creating the previously-described open magnet.
摘要翻译： 用于磁共振成像（MRI）应用的开放磁体。 磁体具有两个间隔开的组件。 每个组件具有从主线圈纵向向外定位的屏蔽线圈，不具有电流并且与主屏蔽线圈和屏蔽线圈间隔开并邻近的可磁化构件以及与可磁化构件间隔开的可磁化磁极片： 本发明在两个组件之间的第一区域中产生磁场，同时通过产生前述的开放磁体，将两个组件之间的第二区域与杂散磁场屏蔽。
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公开(公告)号：US5994991A
公开(公告)日：1999-11-30
申请号：US199096
申请日：1998-11-24
申请人： Evangelos Trifon Laskaris , Michael Anthony Palmo , Bu-Xin Xu , Michele Dollar Ogle , Bruce Campbell Amm
发明人： Evangelos Trifon Laskaris , Michael Anthony Palmo , Bu-Xin Xu , Michele Dollar Ogle , Bruce Campbell Amm
IPC分类号： G01R33/421 , A61B5/055 , G01R33/38 , G01R33/381 , G01R33/3815 , H01F6/00 , H01F7/20 , H01F1/00
CPC分类号： G01R33/421 , G01R33/3806 , G01R33/3815
摘要： An open magnet useful in magnetic resonance imaging (MRI) applications. The magnet has two spaced-apart assemblies. Each assembly has a shielding coil located longitudinally outward from a main coil, a magnetizable member not carrying an electric current and spaced apart from and proximate the main and shielding coils, and a magnetizable pole piece spaced apart from the magnetizable member: The method of the invention generates a magnetic field in a first area between the two assemblies while shielding a second area not between the two assemblies from a stray magnetic field by creating the previously-described open magnet.
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公开(公告)号：US07053743B2
公开(公告)日：2006-05-30
申请号：US10309146
申请日：2002-12-04
申请人： Evangelos Trifon Laskaris , Michael Anthony Palmo , Kathleen Melanie Amm , Paul Shadforth Thompson
发明人： Evangelos Trifon Laskaris , Michael Anthony Palmo , Kathleen Melanie Amm , Paul Shadforth Thompson
CPC分类号： H01F41/0253 , H01F13/003
摘要： An imaging apparatus, such as an MRI system, contains at least one layer of soft magnetic material between the yoke and each permanent magnet. This imaging apparatus may be operated without pole pieces due to the presence of the soft magnetic material. The permanent magnets may be fabricated by magnetizing unmagnetized alloy bodies after the unmagnetized alloy bodies have been attached to the yoke.
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公开(公告)号：US06172588B2
公开(公告)日：2001-01-09
申请号：US09385407
申请日：1999-08-31
IPC分类号： H01F500
CPC分类号： H01F6/00 , G01R33/3806 , G01R33/3815 , Y10S505/892
摘要： A magnet, such as an open magnetic-resonance-imaging (MRI) magnet) has a first assembly including a superconductive main coil and a magnetizable pole piece which, during magnet operation, has a temperature equal to generally the temperature of the main coil. In one example, a cryogenic-fluid (e.g., liquid helium) dewar encloses the main coil, and the dewar has an interior surface defined in part by a surface portion of the pole piece. A method for providing a homogeneous imaging volume for a magnet includes steps to construct the above-described magnet.
摘要翻译： 诸如开放式磁共振成像（MRI）磁体的磁体具有包括超导主线圈和可磁化极片的第一组件，其在磁铁操作期间具有等于主线圈温度的温度。 在一个实例中，低温流体（例如液氦）杜瓦包围主线圈，并且杜瓦具有部分由极片的表面部分限定的内表面。 提供用于磁体的均匀成像体积的方法包括构造上述磁体的步骤。
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公开(公告)号：US5883558A
公开(公告)日：1999-03-16
申请号：US61415
申请日：1998-04-16
IPC分类号： H01F27/36 , G01R33/38 , G01R33/3815 , G01R33/421 , H01F6/00 , H05K9/00 , H01F1/00
CPC分类号： G01R33/421 , G01R33/3806 , G01R33/3815
摘要： An open superconductive magnet useful in magnetic resonance imaging (MRI) applications. The magnet has two spaced-apart assemblies and preferably has a "C" shape. Each assembly has: a vacuum enclosure having a longitudinal axis and surrounding a bore; a magnetizable pole piece located within the bore and outside the vacuum enclosure; and a superconductive main coil, a superconductive shielding coil, and a magnetizable ring positioned within the vacuum enclosure. There is no magnetizable solid path between the two pole pieces. Preferably, the ring is positioned longitudinally between the main and shielding coils.
摘要翻译： 用于磁共振成像（MRI）应用的开放超导磁体。 磁体具有两个间隔开的组件，并且优选具有“C”形状。 每个组件具有：具有纵向轴线并围绕孔的真空外壳; 位于孔内并位于真空外壳外的可磁化极片; 以及超导主线圈，超导屏蔽线圈和位于真空外壳内的可磁化环。 两个极片之间没有可磁化的实心路径。 优选地，环被纵向地定位在主屏蔽线圈和屏蔽线圈之间。
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公开(公告)号：US5874880A
公开(公告)日：1999-02-23
申请号：US35639
申请日：1998-03-05
IPC分类号： A61B5/055 , G01R33/38 , G01R33/3815 , G01R33/385 , G01R33/421 , H01F7/20 , H01F27/36 , G01V3/00
CPC分类号： G01R33/421 , G01R33/3806 , G01R33/3815
摘要： An open superconductive magnet useful in magnetic resonance imaging (MRI) applications. The magnet has two spaced apart assemblies, wherein each assembly has a superconductive shielding coil spaced longitudinally outward and apart from a superconductive main coil. A magnetizable pole piece is spaced apart from the coils, has a radially-outer portion at least partially radially overlapping the main coil, and has a longitudinally-inner portion which projects longitudinally inward past the longitudinally outer end of the main coil.
摘要翻译： 用于磁共振成像（MRI）应用的开放超导磁体。 磁体具有两个间隔开的组件，其中每个组件具有纵向向外并与超导主线圈隔开的超导屏蔽线圈。 可磁化极片与线圈间隔开，具有至少部分地径向重叠主线圈的径向外部，并且具有纵向内部，其纵向向内突出穿过主线圈的纵向外端。
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