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1. 发明授权

US06694602B2 Method of making a pole piece for an MRI 失效
标题翻译：制作磁极片的方法
公开(公告)号：US06694602B2
公开(公告)日：2004-02-24
申请号：US09738856
申请日：2000-12-18
申请人： Evangelos T. Laskaris , William D. Barber , Bulent Aksel , Paul S. Thompson , Michele D. Ogle
发明人： Evangelos T. Laskaris , William D. Barber , Bulent Aksel , Paul S. Thompson , Michele D. Ogle
IPC分类号： H01F706
CPC分类号： H01F7/0278 , G01R33/383 , Y10S29/001 , Y10T29/4902 , Y10T29/49075 , Y10T29/49078
摘要： A method is presented for manufacturing laminate tile metal pole pieces for an MRI. Each laminate tile has a trapezoidal or annular sector shape. The trapezoidal shape allows the tiles to be attached side by side to form a multiple concentric annular array pole piece without using oddly shaped edge filler tiles needed to fill a circular pole piece with square tiles. The pole piece is made by placing a plurality of tiles into a mold and filling the mold with an adhesive substance to bind the plurality of tiles into a unitary tile body. The unitary tile body is then removed from the mold and attached to a pole piece base to form the pole piece. The mold cavity surface preferably has a non-uniform contour. The bottom surface of the unitary tile body forms a substantially inverse contour of the mold cavity surface contour.
摘要翻译：提出了一种用于制造用于MRI的层压瓦片金属极片的方法。每个层压砖具有梯形或环形扇形。梯形形状允许瓦片并排连接以形成多个同心环形阵列极片，而不使用填充具有方形瓦片的圆形极片所需的奇怪形状的边缘填充瓦。极片通过将多个瓦片放置在模具中并用粘合剂物质填充模具来制造，以将多个瓦片粘合成整体瓦片体。然后将单一瓦片体从模具中取出并附接到极片基座以形成极片。模腔表面优选具有不均匀的轮廓。整体瓦片体的底面形成模腔表面轮廓的基本上相反的轮廓。

2. 发明授权

US06429761B2 Mold for bonding MRI pole piece tiles and method of making the mold 有权
标题翻译：用于粘结MRI极片的模具和制造模具的方法
公开(公告)号：US06429761B2
公开(公告)日：2002-08-06
申请号：US09738838
申请日：2000-12-18
申请人： Evangelos T. Laskaris , William D. Barber , Johannes M van Oort , Bulent Aksel , Paul S. Thompson , Michele D. Ogle
发明人： Evangelos T. Laskaris , William D. Barber , Johannes M van Oort , Bulent Aksel , Paul S. Thompson , Michele D. Ogle
IPC分类号： H01F500
CPC分类号： H01F7/0278 , G01R33/383 , Y10S29/001 , Y10T29/4902 , Y10T29/49075 , Y10T29/49078
摘要： A laminate tile pole piece for an MRI, a method and a mold for manufacturing laminate tile metal pole pieces for an MRI. Each laminate tile has a trapezoidal or annular sector shape. The trapezoidal shape allows the tiles to be attached side by side to form a multiple concentric annular array pole piece without using oddly shaped edge filler tiles needed to fill a circular pole piece with square tiles. The pole piece is made by placing a plurality of tiles into a mold and filling the mold with an adhesive substance to bind the plurality of tiles into a unitary tile body. The unitary tile body is then removed from the mold and attached to a pole piece base to form the pole piece. The mold cavity surface preferably has a non-uniform contour. The bottom surface of the unitary tile body forms a substantially inverse contour of the mold cavity surface contour.
摘要翻译：用于MRI的叠层瓦片极片，用于制造用于MRI的层压瓦片金属极片的方法和模具。每个层压砖具有梯形或环形扇形。梯形形状允许瓦片并排连接以形成多个同心环形阵列极片，而不使用填充具有方形瓦片的圆形极片所需的奇怪形状的边缘填充瓦。极片通过将多个瓦片放置在模具中并用粘合剂物质填充模具来制造，以将多个瓦片粘合成整体瓦片体。然后将单一瓦片体从模具中取出并附接到极片基座以形成极片。模腔表面优选具有不均匀的轮廓。整体瓦片体的底面形成模腔表面轮廓的基本上相反的轮廓。

3. 发明授权

US06259252B1 Laminate tile pole piece for an MRI, a method manufacturing the pole piece and a mold bonding pole piece tiles 失效
标题翻译：用于MRI的层叠瓦片极片，制造极片的方法和模具接合极片瓦片
公开(公告)号：US06259252B1
公开(公告)日：2001-07-10
申请号：US09198507
申请日：1998-11-24
申请人： Evangelos T. Laskaris , William D. Barber , Johannes M van Oort , Bulent Aksel , Paul S. Thompson , Michele D. Ogle
发明人： Evangelos T. Laskaris , William D. Barber , Johannes M van Oort , Bulent Aksel , Paul S. Thompson , Michele D. Ogle
IPC分类号： G01V300
CPC分类号： H01F7/0278 , G01R33/383 , Y10S29/001 , Y10T29/4902 , Y10T29/49075 , Y10T29/49078
摘要： A laminate tile pole piece for an MRI. Each laminate tile has a trapezoidal or annular sector shape. The trapezoidal shape allows the tiles to be attached side by side to form a multiple concentric annular array pole piece without using oddly shaped edge filler tiles needed to fill a circular pole piece with square tiles. The pole piece is made by placing a plurality of tiles into a mold and filling the mold with an adhesive substance to bind the plurality of tiles into a unitary tile body. The unitary tile body is then removed from the mold and attached to a pole piece base to form the pole piece. The mold cavity surface preferably has a non-uniform contour. The bottom surface of the unitary tile body forms a substantially inverse contour of the mold cavity surface contour.
摘要翻译：用于MRI的层压瓦片极片。每个层压砖具有梯形或环形扇形。梯形形状允许瓦片并排连接以形成多个同心环形阵列极片，而不使用填充具有方形瓦片的圆形极片所需的奇怪形状的边缘填充瓦。极片通过将多个瓦片放置在模具中并用粘合剂物质填充模具来制造，以将多个瓦片粘合成整体瓦片体。然后将单一瓦片体从模具中取出并附接到极片基座以形成极片。模腔表面优选具有不均匀的轮廓。整体瓦片体的底面形成模腔表面轮廓的基本上相反的轮廓。

4. 发明授权

US5568102A Closed superconductive magnet with homogeneous imaging volume 失效
标题翻译：封闭的超导磁体具有均匀的成像体积
公开(公告)号：US5568102A
公开(公告)日：1996-10-22
申请号：US603520
申请日：1996-02-20
申请人： Bizhan Dorri , Evangelos T. Laskaris , Michele D. Ogle
发明人： Bizhan Dorri , Evangelos T. Laskaris , Michele D. Ogle
IPC分类号： G01R33/3815 , G01R33/3873 , H01F6/06 , G01V3/00
CPC分类号： G01R33/3815 , G01R33/3873
摘要： A closed magnetic resonance imaging (MRI) magnet has a single superconductive coil assembly including a toroidal-shaped coil housing containing a pair of superconductive main coils and at least one additional superconductive main coil. A pair of generally annular-shaped permanent magnet arrays is spaced radially inward and apart from the superconductive main coils. The permanent magnet arrays allow the design of a shorter MRI magnet because the permanent magnet arrays overcome the gross magnetic field distortions in the imaging volume of the magnet (created by removing some of the additional longitudinally-outermost superconductive main coils, otherwise used in the magnet, to make the magnet shorter) to produce a magnetic field of high uniformity within the imaging volume.
摘要翻译：闭合磁共振成像（MRI）磁体具有单个超导线圈组件，其包括包含一对超导主线圈和至少一个额外的超导主线圈的环形线圈壳体。一对大致环形的永磁体阵列径向向内并与超导主线圈隔开。永磁体阵列允许设计较短的MRI磁体，因为永久磁体阵列克服了磁体成像体积中的总磁场失真（通过去除一些附加的纵向最外面的超导主线圈而产生，否则在磁体中使用，以使磁体更短）以在成像体积内产生高均匀性的磁场。

5. 发明授权

US5517169A Superconducting magnet with magnetic shielding 失效
标题翻译：磁屏蔽超导磁体
公开(公告)号：US5517169A
公开(公告)日：1996-05-14
申请号：US323649
申请日：1994-10-17
申请人： Evangelos T. Laskaris , Bizhan Dorri , Madabushi V. Chari , Gerald B. Kliman , Michele D. Ogle
发明人： Evangelos T. Laskaris , Bizhan Dorri , Madabushi V. Chari , Gerald B. Kliman , Michele D. Ogle
IPC分类号： G01R33/3815 , G01R33/421 , G01V3/00
CPC分类号： G01R33/421 , G01R33/3815
摘要： A superconductive magnet with magnetic shielding has an annularly-cylindrical-shaped housing whose first end wall and outer cylindrical wall are magnetizable (e.g., iron) walls and whose inner cylindrical wall is a non-magnetizable wall. At least one main superconductive coil is positioned within the housing and carries an electric current in a first (e.g., clockwise) direction. An annular first permanent magnet is positioned outside the housing longitudinally proximate the first end wall. The first permanent magnet has a number of equivalent ampere turns and has a magnetic field direction oriented parallel to the axis pointing towards the second end wall so that its magnetic field longitudinally pulls the stray magnetic field of the superconductive coil(s), which leaves the magnet's bore, inward to be captured by the iron first end wall.
摘要翻译：具有磁屏蔽的超导磁体具有环形圆柱形的壳体，其第一端壁和外圆柱形壁是可磁化的（例如铁）壁，并且其内圆柱形壁是不可磁化的壁。至少一个主超导线圈定位在壳体内并且以第一（例如，顺时针）方向承载电流。环形第一永久磁铁定位在外壳的纵向附近，靠近第一端壁。第一永磁体具有多个等效的安匝数，并且具有平行于指向第二端壁的轴定向的磁场方向，使得其磁场纵向拉动超导线圈的杂散磁场，其离开磁铁的内孔，被铁的第一端壁捕获。

6. 发明授权

US5446434A Magnet having pole faces with trapezoidal-shaped shims 失效
标题翻译：磁铁具有带梯形垫片的极面
公开(公告)号：US5446434A
公开(公告)日：1995-08-29
申请号：US280976
申请日：1994-07-27
申请人： Bizhan Dorri , Evangelos T. Laskaris , Michele D. Ogle
发明人： Bizhan Dorri , Evangelos T. Laskaris , Michele D. Ogle
IPC分类号： G01R33/38 , G01R33/383 , G01R33/3873 , H01F6/00 , G01V3/00
CPC分类号： H01F6/00 , G01R33/383 , G01R33/3873 , G01R33/3806
摘要： A magnet including spaced-apart first and second pole pieces with generally opposing first and second pole faces. The first pole face has an axis extending generally towards the second pole face and has a generally circular shim tray generally coaxially aligned with the axis and attached to the first pole face. The circular shim tray has shims each with a shape of generally a trapezoid when viewed facing the first pole face. The trapezoidal shaped shims may be arranged on the circumferences of imaginary concentric circles on the circular shim trays, with trapezoids on the same circumference having generally the same trapezoidal shape and with trapezoids on different circumferences having generally different trapezoidal shapes, to provide a smoother magnetic field to better reduce 3D (three-dimensional) magnetic field inhomogeneity.
摘要翻译：磁体包括间隔开的第一和第二极片，其具有大致相对的第一和第二极面。第一极面具有大致朝向第二极面延伸的轴线，并且具有大致圆形的垫片托盘，其大致与轴线同轴对准并且附接到第一极面。当朝向第一极面时，圆形垫片每个都具有大致梯形的形状。梯形垫片可以布置在圆形垫片托盘上的虚拟同心圆的圆周上，同一圆周上的梯形具有大致相同的梯形形状，并且梯形在不同的圆周上具有大致不同的梯形形状，以提供更平滑的磁场以更好地减少3D（三维）磁场不均匀性。

7. 发明授权

US5307039A Frustoconical magnet for magnetic resonance imaging 失效
标题翻译：用于磁共振成像的截面磁铁
公开(公告)号：US5307039A
公开(公告)日：1994-04-26
申请号：US942003
申请日：1992-09-08
申请人： Madabushi V. Chari , Evangelos T. Laskaris , Michele D. Ogle
发明人： Madabushi V. Chari , Evangelos T. Laskaris , Michele D. Ogle
IPC分类号： A61B5/055 , G01R33/38 , G01R33/3815 , H01F5/00
CPC分类号： G01R33/3815 , G01R33/3806
摘要： An open magnet having a frustoconical shaped inner bore is provided for MR imaging. The magnet has a plurality of axisymmetric superconducting coils of differing diameters which are disposed along an axis in order of successively increasing diameters so as to define the frustoconical shape. This shape permits a patient access opening which is much larger than that in conventional cylindrical magnets. The overall length is much less than the length of conventional systems. The combination of wide opening and short length facilitates patient access and presents a feeling of openness. Furthermore, the device can be tilted with respect to horizontal to increase the openness.
摘要翻译：提供具有截头圆锥形内孔的开放磁体用于MR成像。磁体具有多个不同直径的轴对称超导线圈，它们沿着轴线设置，以便依次增加直径以限定截头圆锥形状。这种形状允许患者进入口比传统的圆柱形磁体大得多。总长度远小于常规系统的长度。宽开口和短长度的组合有助于患者进入并呈现出开放的感觉。此外，该装置可以相对于水平面倾斜以增加开放度。

8. 发明授权

US5568110A Closed MRI magnet having reduced length 失效
标题翻译：闭合MRI磁体具有减小的长度
公开(公告)号：US5568110A
公开(公告)日：1996-10-22
申请号：US603522
申请日：1996-02-20
申请人： Bizhan Dorri , Evangelos T. Laskaris , Michele D. Ogle
发明人： Bizhan Dorri , Evangelos T. Laskaris , Michele D. Ogle
IPC分类号： G01R33/3815 , G01R33/3875 , H01F6/06 , G01V3/00
CPC分类号： G01R33/3815 , G01R33/3875
摘要： A closed magnetic resonance imaging (MRI) magnet has a single superconductive coil assembly including a toroidal-shaped coil housing containing a pair of superconductive main coils. A pair of generally annular-shaped bucking coils, carrying electric current in a direction opposite to that of the superconductive main coils, is spaced radially inward and apart from the superconductive main coils. The bucking coils allow the design of a shorter MRI magnet because the bucking coils overcome the gross magnetic field distortions in the imaging volume of the magnet (created by removing some of the additional longitudinally-outermost superconductive main coils, otherwise used in the magnet, to make the magnet shorter) to produce a magnetic field of high uniformity within the imaging volume.
摘要翻译：闭合磁共振成像（MRI）磁体具有单个超导线圈组件，其包括含有一对超导主线圈的环形线圈壳体。在与超导主线圈的方向相反的方向上承载电流的一对大体呈环形的抵抗线圈与超导主线圈径向向内和间隔开。屈曲线圈允许设计较短的MRI磁体，因为降压线圈克服了磁体成像体积中的总磁场失真（通过除去磁体中另外使用的一些附加的纵向最外面的超导主线圈产生，使磁体更短），以在成像体积内产生高均匀性的磁场。

9. 发明授权

US5565831A Shielded and open MRI magnet 失效
标题翻译：屏蔽和开放MRI磁铁
公开(公告)号：US5565831A
公开(公告)日：1996-10-15
申请号：US547083
申请日：1995-10-23
申请人： Bizhan Dorri , Evangelos T. Laskaris , Michele D. Ogle , Timothy J. Havens
发明人： Bizhan Dorri , Evangelos T. Laskaris , Michele D. Ogle , Timothy J. Havens
IPC分类号： G01R33/421 , A61B5/055 , G01R33/38 , G01R33/3815 , H01F6/00 , H05K9/00 , G01V3/00
CPC分类号： G01R33/3806 , G01R33/3815
摘要： A shielded and open magnetic resonance imaging (MRI) magnet having two spaced-apart, generally toroidal-shaped superconductive coil assemblies. Each coil assembly has a coil housing containing a generally annular-shaped superconductive main and a radially-outwardly spaced-apart shielding coil carrying electric currents in opposing directions. Preferably, supplemental shielding is provided with the addition of: a generally annular permanent magnet configuration internal to, or external of, the coil housings; a generally-non-permanently-magnetized external ferromagnetic shield having at least a portion positioned longitudinally between the coil housings, an external resistive coil; or combinations thereof.
摘要翻译：具有两个间隔开的大致环形形状的超导线圈组件的屏蔽和开放磁共振成像（MRI）磁体。每个线圈组件具有线圈壳体，其包含大致环形的超导主体和沿相反方向承载电流的径向向外间隔开的屏蔽线圈。优选地，补充屏蔽被提供有：线圈壳体内部或外部的大致环形的永磁体构造; 一个非永久磁化的外部铁磁屏蔽件，至少有一部分纵向位于线圈壳体之间，一个外部电阻线圈; 或其组合。

10. 发明授权

US5539366A Magnet having contoured pole faces for magnetic field homogeneity 失效
标题翻译：具有磁场均匀性的磁极形状的磁体
公开(公告)号：US5539366A
公开(公告)日：1996-07-23
申请号：US281044
申请日：1994-07-27
申请人： Bizhan Dorri , Evangelos T. Laskaris , Michele D. Ogle , Bu-Xin Xu
发明人： Bizhan Dorri , Evangelos T. Laskaris , Michele D. Ogle , Bu-Xin Xu
IPC分类号： G01R33/38 , G01R33/3815 , H01F6/00 , H01F3/00 , G01V3/00
CPC分类号： G01R33/3806 , G01R33/3815 , H01F6/00
摘要： A magnet including spaced-apart first and second pole pieces with generally opposing first and second pole faces. The first pole face has an axis extending generally towards the second pole face and has a surface region which includes at least two frustoconical surfaces. The frustoconical surfaces are generally coaxially aligned about the axis, and radially-adjacent frustoconical surfaces abut each other. In a second embodiment, points on the surface region located an identical radial distance from the axis are also located a common axial distance along the axis, and a graph of axial distance along the axis versus radial distance from the axis for such points is a curve having a continuous slope with at least two sign reversals. Such contoured pole faces allow for a smoother magnetic field to better reduce axisymmetric magnetic field inhomogeneity.
摘要翻译：磁体包括间隔开的第一和第二极片，其具有大致相对的第一和第二极面。第一极面具有大致朝向第二极面延伸的轴线，并且具有包括至少两个截头圆锥形表面的表面区域。截头圆锥形表面通常围绕轴线同轴对准，并且径向相邻的截头圆锥形表面彼此邻接。在第二实施例中，位于与轴相同的径向距离的表面区域上的点也沿着轴线定位共同的轴向距离，并且沿轴线的轴向距离与该轴线相对于径向距离的曲线图是曲线具有至少两个符号反转的连续斜率。这种轮廓极面允许更平滑的磁场更好地减少轴对称磁场不均匀性。

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