公开(公告)号：US06518867B2

公开(公告)日：2003-02-11

申请号：US09824245

申请日：2001-04-03

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

IPC分类号： H01F500

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.

公开(公告)号：US07023309B2

公开(公告)日：2006-04-04

申请号：US10309139

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

IPC分类号： H01F7/02

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.

公开(公告)号：US06525634B2

公开(公告)日：2003-02-25

申请号：US10157965

申请日：2002-05-31

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

IPC分类号： H01F100

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.

公开(公告)号：US06396376B1

公开(公告)日：2002-05-28

申请号：US09716127

申请日：2000-11-17

申请人： Evangelos Trifon Laskaris ,  Michael Anthony Palmo

发明人： Evangelos Trifon Laskaris ,  Michael Anthony Palmo

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。