利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

65 条记录 (耗时 0.026 秒)

    Inherently de-coupled sandwiched solenoidal array coil
    3.
    发明授权
    Inherently de-coupled sandwiched solenoidal array coil 有权

    公开(公告)号：US06751496B2

    公开(公告)日：2004-06-15

    申请号：US09935705

    申请日：2001-08-24

    申请人： Sunyu Su ,  Leon Kaufman ,  Mitsuaki Arakawa

    发明人： Sunyu Su ,  Leon Kaufman ,  Mitsuaki Arakawa

    IPC分类号： A61B5055

    CPC分类号： G01R33/3415

    摘要： An inherently de-coupled sandwiched solenoidal array coil (SSAC) is disclosed for use in receiving nuclear magnetic resonance (NMR) radio frequency (RF) signals in both horizontal and vertical-field magnetic resonance imaging (MRI) systems. In its most basic configuration, the SSAC comprises two coaxial RF receive coils. The first coil of the array has two solenoidal (or loop) sections that are separated from one another along a common axis. The two sections are electrically connected in series but the conductors in each section are wound in opposite directions so that a current through the coil sets up a magnetic field of opposite polarity in each section. The second coil of the SSAC is disposed (“sandwiched”) between the two separated solenoidal sections of the first coil in a region where the combined opposing magnetic fields cancel to become a null. Due to the winding arrangement and geometrical symmetry, the receive coils of the array become electromagnetically “de-coupled” from one another while still maintaining their sensitivity toward receiving NMR signals. The multiple coil array arrangement also allows for selecting between a larger or smaller field-of-view (FOV) to avoid image fold-over problems without time penalty in image data acquisition. Alternative embodiments are disclosed which include unequal constituent coil diameters, unequal constituent coil windings, non-coaxial coil configurations, a three-coil quadrature detection (QD) SSAC arrangement, multiple SSAC arrangements, and optimized SSAC configurations for breast imaging in both horizontal and vertical-field MRI systems.

    Inherently de-coupled sandwiched solenoidal array coil
    4.
    发明授权
    Inherently de-coupled sandwiched solenoidal array coil 有权
    固有的去耦合夹层螺线管阵列线圈

    公开(公告)号：US06493572B1

    公开(公告)日：2002-12-10

    申请号：US09408506

    申请日：1999-09-30

    申请人： Sunyu Su ,  Leon Kaufman ,  Mitsuaki Arakawa ,  Joseph W. Carlson

    发明人： Sunyu Su ,  Leon Kaufman ,  Mitsuaki Arakawa ,  Joseph W. Carlson

    IPC分类号： A61B5055

    CPC分类号： G01R33/3415

    摘要： An inherently de-coupled sandwiched solenoidal array coil (SSAC) is disclosed for use in receiving nuclear magnetic resonance (NMR) radio frequency (RF) signals in both horizontal and vertical-field magnetic resonance imaging (MRI) systems. In its most basic configuration, the SSAC comprises two coaxial RF receive coils. The first coil of the array has two solenoidal (or loop) sections that are separated from one another along a common axis. The two sections are electrically connected in series but the conductors in each section are wound in opposite directions so that a current through the coil sets up a magnetic field of opposite polarity in each section. The second coil of the SSAC is disposed (“sandwiched”) between the two separated solenoidal sections of the first coil in a region where the combined opposing magnetic fields cancel to become a null. Due to the winding arrangement and geometrical symmetry, the receive coils of the array become electromagnetically “de-coupled” from one another while still maintaining their sensitivity toward receiving NMR signals. The multiple coil array arrangement also allows for selecting between a larger or smaller field-of-view (FOV) to avoid image fold-over problems without time penalty in image data acquisition. Alternative embodiments are disclosed which include unequal constituent coil diameters, unequal constituent coil windings, non-coaxial coil configurations, a three-coil quadrature detection (QD) SSAC arrangement, multiple SSAC arrangements, and optimized SSAC configurations for breast imaging in both horizontal and vertical-field MRI systems.

    摘要翻译： 公开了一种固有的去耦合的夹层螺线管阵列线圈（SSAC），用于在水平和垂直场磁共振成像（MRI）系统中接收核磁共振（NMR）射频（RF）信号。 在其最基本的配置中，SSAC包括两个同轴RF接收线圈。 阵列的第一个线圈具有沿公共轴彼此分离的两个螺线管（或环）部分。 两个部分串联电连接，但每个部分中的导体沿相反的方向缠绕，使得通过线圈的电流在每个部分中建立相反极性的磁场。 SSAC的第二线圈在组合的相对磁场取消为零的区域中被布置（“夹持”在第一线圈的两个分离的螺线管部分之间）。 由于绕组布置和几何对称性，阵列的接收线圈彼此电磁“去耦合”，同时仍然保持对接收NMR信号的灵敏度。 多线圈阵列布置还允许在更大或更小的视场（FOV）之间进行选择，以避免图像折叠问题，而在图像数据采集中没有时间损失。 公开了包括不等构成线圈直径，不相等的构成线圈绕组，非同轴线圈配置，三线圈正交检测（QD）SSAC布置，多个SSAC布置以及用于乳腺成像在水平和垂直方向上的优化SSAC配置的替代实施例 场MRI系统。

    Open architecture iron core electromagnet for MRI using superconductive winding
    6.
    发明授权
    Open architecture iron core electromagnet for MRI using superconductive winding 失效
    使用超导绕组开放架构用于MRI的铁芯电磁铁

    公开(公告)号：US5250901A

    公开(公告)日：1993-10-05

    申请号：US789041

    申请日：1991-11-07

    申请人： Leon Kaufman ,  Joseph W. Carlson

    发明人： Leon Kaufman ,  Joseph W. Carlson

    IPC分类号： G01R33/38 ,  G01R33/383 ,  G01R33/3875 ,  G01R33/20

    CPC分类号： G01R33/383 ,  G01R33/3806 ,  G01R33/3875

    摘要： A high T.sub.c superconductive electromagnet winding is advantageously employed as part of an MRI magnet structure having a pair of magnetically permeable poles opposingly disposed about the patient imaging volume. The magnetic circuit is otherwise completed by a magnetically permeable yoke structure having plural open apertures for easy access to the patient imaging volume. Still further advantage can be had by asymmetrically disposing a single superconductive electromagnet winding with respect to the patient image volume thereby eliminating the need for more than one cryostat. When high T.sub.c superconductive electromagnetic windings are utilized, a non-conductive composite cryostat may also be used to further reduce spurious eddy current fields. When an asymmetric single high T.sub.c superconductive electromagnet coil is utilized, an asymmetric electromagnet shim winding may also be employed so as to further increase the magnetic field homogeneity within what is now an asymmetrically located patient imaging volume within the air gap of the magnet structure.

    摘要翻译： 有利地采用高Tc超导电磁铁绕组作为具有相对设置在患者成像体积周围的一对导磁极的MRI磁体结构的一部分。 否则，磁路可以通过具有多个开放孔径的磁性可透过的磁轭结构来完成，以容易地接近患者成像体积。 可以通过相对于患者图像体积不对称地布置单个超导电磁铁绕组而进一步的优点，从而不需要多于一个的低温恒温器。 当使用高Tc超导电磁绕组时，也可以使用非导电复合低温恒温器来进一步减少杂散涡流场。 当使用非对称单高Tc超导电磁线圈时，也可以采用非对称电磁铁垫片绕组，以便进一步增加磁体均匀性，现在在磁体结构的气隙内的不对称位置的患者成像体积内。

    Gradient driver control in magnetic resonance imaging
    7.
    发明授权
    Gradient driver control in magnetic resonance imaging 失效
    磁共振成像中梯度驱动控制

    公开(公告)号：US5227728A

    公开(公告)日：1993-07-13

    申请号：US786828

    申请日：1991-11-01

    申请人： Leon Kaufman ,  Joseph W. Carlson ,  Richard Gran

    发明人： Leon Kaufman ,  Joseph W. Carlson ,  Richard Gran

    IPC分类号： A61B5/055 ,  G01R33/12 ,  G01R33/381 ,  G01R33/385 ,  G01R33/389

    CPC分类号： G01R33/385 ,  G01R33/389

    摘要： Electromagnet coil driving circuitry in a magnetic resonance imaging system is modified to include a flux-driven closed-loop real-time feedback control. The result is more accurate and efficient control of the net actual gradient flux generated by the coil even in the presence of magnetic circuit materials exhibiting hysteresis effects and/or electrical conductors giving rise to eddy current effects. Such driver control can be used to simultaneously correct the magnetic flux changes induced by environmental, ambient or other outside disturbances affecting the net magnetic field within a patient imaging volume of a magnetic resonance imaging system.

    摘要翻译： 磁共振成像系统中的电磁线圈驱动电路被修改为包括磁通驱动的闭环实时反馈控制。 结果是即使在存在导致涡流效应的磁滞效应的磁路材料和/或电导体的情况下，线圈产生的净实际梯度通量的更精确和有效的控制。 可以使用这样的驱动器控制来同时校正由影响磁共振成像系统的患者成像体积内的净磁场的环境，环境或其它外部干扰引起的磁通量变化。

    Interventional MRI system and RF coils therefore
    10.
    发明授权
    Interventional MRI system and RF coils therefore 失效
    介入MRI系统和RF线圈因此

    公开(公告)号：US5357958A

    公开(公告)日：1994-10-25

    申请号：US33551

    申请日：1993-03-18

    申请人： Leon Kaufman

    发明人： Leon Kaufman

    IPC分类号： A61B5/055 ,  G01R33/32 ,  G01R33/34 ,  G01R33/36 ,  A61B5/05

    CPC分类号： G01R33/34084 ,  G01R33/34053 ,  G01R33/3628

    摘要： An MRI RF coil utilizes a helical conductor having a plurality of turns and a non-uniform pitch between turns along at least a portion of the axial length of the coil. The non-uniform pitch is disposed so as to accommodate interventional procedures and/or interventional apparatus (e.g., stereotaxic frames) when used on a human patient in conjunction with magnetic resonance imaging. The non-uniform pitch portion of the coil may comprise a simple gap, an opening formed by deformation or angular disposition of some or all of the coil turns and/or by utilizing fringe field effects of the coil to accomplish at least some of the magnetic resonance imaging procedure.

    摘要翻译： MRI RF线圈利用螺旋导体，该螺旋导体沿线圈的轴向长度的至少一部分具有多个匝和匝之间的不均匀节距。 当与人类患者结合磁共振成像使用时，非均匀间距被设置为适应介入手术和/或介入装置（例如，立体定位框架）。 线圈的不均匀节距部分可以包括简单的间隙，通过一些或所有线圈的变形或角度布置形成的开口和/或通过利用线圈的边缘场效应来实现至少一些磁 共振成像程序。