公开(公告)号：US08981779B2

公开(公告)日：2015-03-17

申请号：US13324850

申请日：2011-12-13

申请人： Shmaryu Shvartsman ,  James Dempsey ,  Gordon DeMeester

发明人： Shmaryu Shvartsman ,  James Dempsey ,  Gordon DeMeester

IPC分类号： G01V3/00 ,  G01R33/3875 ,  G01R33/38 ,  G01R33/48

CPC分类号： G01R33/3875 ,  G01R33/3642 ,  G01R33/3806 ,  G01R33/385 ,  G01R33/4808 ,  G01R33/481 ,  G01R33/4812 ,  G01R33/4814

摘要： Active resistive shim coil assemblies may be used in magnetic resonance imaging (MRI) systems to reduce in-homogeneity of the magnetic field in the imaging volume. Disclosed embodiments may be used with continuous systems, gapped cylindrical systems, or vertically gapped systems. Disclosed embodiments may also be used with an open MRI system and can be used with an instrument placed in the gap of the MRI system. An exemplary embodiment of the active resistive shim coil assembly of the present disclosure includes active resistive shim coils each operable to be energized by separate currents through a plurality of power channels. In some embodiments, the disclosed active resistive shim coil assemblies allow for various degrees of freedom to shim out field in-homogeneity.

摘要翻译： 有源电阻衬片线圈组件可用于磁共振成像（MRI）系统，以减小成像体积中磁场的均匀性。 公开的实施例可以与连续系统，间隙圆柱形系统或垂直间隙系统一起使用。 公开的实施例也可以与开放式MRI系统一起使用，并且可以与放置在MRI系统的间隙中的仪器一起使用。 本公开的有源电阻衬片线圈组件的示例性实施例包括有源电阻衬垫线圈，其可操作以由通过多个功率通道的分离电流激励。 在一些实施例中，所公开的主动阻抗衬片线圈组件允许不同程度的自由度来均匀地摆放场。

公开(公告)号：US20130147476A1

公开(公告)日：2013-06-13

申请号：US13324850

申请日：2011-12-13

申请人： Shmaryu Shvartsman ,  James Dempsey ,  Gordon DeMeester

发明人： Shmaryu Shvartsman ,  James Dempsey ,  Gordon DeMeester

IPC分类号： G01R33/58 ,  G01R33/341

CPC分类号： G01R33/3875 ,  G01R33/3642 ,  G01R33/3806 ,  G01R33/385 ,  G01R33/4808 ,  G01R33/481 ,  G01R33/4812 ,  G01R33/4814

摘要： Active resistive shim coil assemblies may be used in magnetic resonance imaging (MRI) systems to reduce in-homogeneity of the magnetic field in the imaging volume. Disclosed embodiments may be used with continuous systems, gapped cylindrical systems, or vertically gapped systems. Disclosed embodiments may also be used with an open MRI system and can be used with an instrument placed in the gap of the MRI system. An exemplary embodiment of the active resistive shim coil assembly of the present disclosure includes active resistive shim coils each operable to be energized by separate currents through a plurality of power channels. In some embodiments, the disclosed active resistive shim coil assemblies allow for various degrees of freedom to shim out field in-homogeneity.

摘要翻译： 有源电阻衬片线圈组件可用于磁共振成像（MRI）系统，以减小成像体积中磁场的均匀性。 公开的实施例可以与连续系统，间隙圆柱形系统或垂直间隙系统一起使用。 公开的实施例也可以与开放式MRI系统一起使用，并且可以与放置在MRI系统的间隙中的仪器一起使用。 本公开的有源电阻衬片线圈组件的示例性实施例包括有源电阻衬垫线圈，其可操作以由通过多个功率通道的分离电流激励。 在一些实施例中，所公开的主动阻抗衬片线圈组件允许不同程度的自由度来均匀地摆放场。

公开(公告)号：US20060033496A1

公开(公告)日：2006-02-16

申请号：US10535530

申请日：2003-10-29

申请人： Shmaryu Shvartsman ,  Michael Morich ,  Gordon DeMeester

发明人： Shmaryu Shvartsman ,  Michael Morich ,  Gordon DeMeester

IPC分类号： G01V3/00

CPC分类号： G01R33/385 ,  G01R33/421 ,  G01R33/4215

摘要： A gradient coil for a magnetic resonance imaging apparatus (10) includes a primary coil (16) defining an inner cylindrical surface (60), and shield coil (18) or coils defining a coaxial outer cylindrical surface (62). Coil jumps (74) connect the primary and shield coils (16, 18). The coil jumps (74) define a non-planar current-sharing surface (64) extending between inner and outer contours (66, 68) that coincide with the inner and outer cylindrical surfaces (60, 62), respectively. The coil (16, 18, 74) defines a current path that passes across the current sharing surface (64) between the inner and outer contours (66, 68) a plurality of times. Optionally, some primary coil turns (70) are electrically interconnected to define an isolated primary sub coil (P2) that together with a second shield (S2, S2′, S2″) enables a discretely or continuously selectable field of view.

摘要翻译： 用于磁共振成像装置（10）的梯度线圈包括限定内圆柱形表面（60）的初级线圈（16）和限定同轴外圆柱形表面（62）的屏蔽线圈（18）或线圈。 线圈跳跃（74）连接主和屏蔽线圈（16,18）。 线圈跳跃（74）限定分别在与内圆柱形表面（60）和外圆柱形表面（62）重合的内轮廓和外轮廓（66,68）之间延伸的非平面分流表面（64）。 线圈（16,18,74）限定了在内外轮廓（66,68）之间穿过电流共享表面（64）的电流路径多次。 可选地，一些初级线圈匝（70）电互连以限定与第二屏蔽（S 2，S 2'，S 2“）一起的隔离的初级次级线圈（P 2），使得能够离散地或连续地选择 视图。

公开(公告)号：US5689189A

公开(公告)日：1997-11-18

申请号：US638203

申请日：1996-04-26

申请人： Michael A. Morich ,  Labros S. Petropoulos ,  Hiroyuki Fujita ,  Shmaryu Shvartsman ,  Robert W. Brown

发明人： Michael A. Morich ,  Labros S. Petropoulos ,  Hiroyuki Fujita ,  Shmaryu Shvartsman ,  Robert W. Brown

IPC分类号： A61B5/055 ,  G01R33/34 ,  G01V3/00

CPC分类号： G01R33/341

摘要： A localized coil (30) is disposed in the temporally constant magnetic field of a magnetic resonance imaging system. The localized coil is designed in five steps: a static problem formulation step, a static current solution step, a discretization step, a current loop connection step, and a high frequency solution step. One radio frequency coil designed by this process to be carried on a circularly cylindrical former includes two coil sections (60, 62) disposed on opposite sides of the dielectric former. Each of the two coil sections includes a pair of inner loops (64.sub.1, 64.sub.2) disposed symmetrically relative to a z=0 plane of symmetry and a second pair of loops (68.sub.1, 68.sub.2) also disposed symmetrically about the plane of symmetry. To raise self-resonance frequency, the inner and outer loops are connected in parallel. The resonance frequency is fine-tuned with reactive elements (66.sub.1, 66.sub.2). To ensure balanced current flow between the two coil portions, the two portions are connected (78) in parallel.

摘要翻译： 局部线圈（30）设置在磁共振成像系统的时间上恒定的磁场中。 局部线圈设计有五个步骤：静态问题制定步骤，静态电流解决步骤，离散化步骤，电流环路连接步骤和高频解决步骤。 通过该工艺设计的一个射频线圈被承载在圆柱形成形器上，包括设置在电介体的相对侧上的两个线圈部分（60,62）。 两个线圈段中的每一个包括一对相对于z = 0对称平面对称设置的内环（641,642），以及也围绕对称平面对称设置的第二对环（681,682）。 为了提高自谐振频率，内环和外环并联。 谐振频率与无功元件（661,662）进行微调。 为了确保两个线圈部分之间的平衡电流流动，两个部分平行连接（78）。

公开(公告)号：US20120229141A1

公开(公告)日：2012-09-13

申请号：US13407852

申请日：2012-02-29

申请人： Robert W. Brown ,  Yong Wu ,  Zhen Yao ,  Shmaryu Shvartsman ,  Thomas Chmielewski ,  Timothy Eagan

发明人： Robert W. Brown ,  Yong Wu ,  Zhen Yao ,  Shmaryu Shvartsman ,  Thomas Chmielewski ,  Timothy Eagan

IPC分类号： G01R33/422 ,  B26D5/00 ,  G06F17/50

CPC分类号： G01R33/422 ,  G01R33/341 ,  G01R33/385 ,  G01R33/4822 ,  G01R33/56518 ,  Y10T83/505

摘要： Radio frequency (RF) shields used with magnetic resonance imaging (MRI) apparatus may experience gradient field induced eddy currents and RF field induced eddy currents. These eddy currents can cause the RF shield to heat up at an undesirable rate. RF shields are designed to have a desired degree of RF shielding and a desired heating attribute. Design goals for RF shields include gradient field transparency and RF field opacity, both of which can be influenced by eddy currents. Example methods identify a gradient field that will induce eddy currents and identify an RF field that will induce eddy currents. If a region on the RF shield is identified where the desired heating attribute will not be achieved, then a pattern of axial cuts and azimuthal cuts can be made in the RF shield to reduce gradient eddy current heating in the RF shield while maintaining desired RF shielding.

摘要翻译： 与磁共振成像（MRI）装置一起使用的射频（RF）屏蔽可能会经历梯度场感应涡流和射频场感应涡流。 这些涡流可以使RF屏蔽以不期望的速率加热。 RF屏蔽被设计为具有期望的RF屏蔽程度和期望的加热属性。 RF屏蔽的设计目标包括梯度场透明度和RF场不透明度，这两者都可以受涡流影响。 示例性方法识别将引起涡流的梯度场，并识别将产生涡流的RF场。 如果RF屏蔽上的区域被识别出将不能实现所需的加热属性，则可以在RF屏蔽中进行轴向切割和方位切割的图案，以减少RF屏蔽中的梯度涡流加热，同时保持所需的RF屏蔽 。

公开(公告)号：US07235973B2

公开(公告)日：2007-06-26

申请号：US10553175

申请日：2004-04-02

申请人： Thomas Chmielewski ,  Shmaryu Shvartsman

发明人： Thomas Chmielewski ,  Shmaryu Shvartsman

IPC分类号： G01V3/00

CPC分类号： G01R33/3678 ,  G01R33/3415

摘要： A magnetic resonance imaging apparatus includes a main magnet (12) for generating a main magnetic field in an examination region (14), a plurality of gradient coils (22) for setting up magnetic field gradients in the main field, an RF transmit coil for transmitting RF signals into the examination region to excite magnetic resonance in a subject disposed therein, and an RF receive coil (16) for receiving RF signals from the subject. The RF receive coil includes a first loop (101) and a second loop (102), the first and second loops being disposed substantially in a similar plane (x-z). Also included is a signal combiner (120) for combining the signals received by the first and second loops in quadrature.

摘要翻译： 磁共振成像装置包括用于在检查区域（14）中产生主磁场的主磁体（12），用于在主场中设置磁场梯度的多个梯度线圈（22），用于在主场中设置磁场梯度的多个梯形线圈 将RF信号发送到检查区域以激发设置在其中的对象中的磁共振，以及用于从对象接收RF信号的RF接收线圈（16）。 RF接收线圈包括第一环（101）和第二环（102），第一和第二环基本上设置在类似的平面（x-z）中。 还包括一个信号组合器（120），用于组合由第一和第二循环以正交方式接收的信号。

公开(公告)号：US20060226840A1

公开(公告)日：2006-10-12

申请号：US10553175

申请日：2004-04-02

申请人： Thomas Chmielewski ,  Shmaryu Shvartsman

发明人： Thomas Chmielewski ,  Shmaryu Shvartsman

IPC分类号： G01V3/00

CPC分类号： G01R33/3678 ,  G01R33/3415

摘要： A magnetic resonance imaging apparatus includes a main magnet (12) for generating a main magnetic field in an examination region (14), a plurality of gradient coils (22) for setting up magnetic field gradients in the main field, an RF transmit coil for transmitting RF signals into the examination region to excite magnetic resonance in a subject disposed therein, and an RF receive coil (16) for receiving RF signals from the subject. The RF receive coil includes a first loop (101) and a second loop (102), the first and second loops being disposed substantially in a similar plane (x-z). Also included is a signal combiner (120) for combining the signals received by the first and second loops in quadrature.

摘要翻译： 磁共振成像装置包括用于在检查区域（14）中产生主磁场的主磁体（12），用于在主场中设置磁场梯度的多个梯度线圈（22），用于在主场中设置磁场梯度的多个梯形线圈 将RF信号发送到检查区域以激发设置在其中的对象中的磁共振，以及用于从对象接收RF信号的RF接收线圈（16）。 RF接收线圈包括第一环（101）和第二环（102），第一和第二环基本上设置在类似的平面（x-z）中。 还包括一个信号组合器（120），用于组合由第一和第二循环以正交方式接收的信号。

公开(公告)号：US07482809B1

公开(公告)日：2009-01-27

申请号：US11779445

申请日：2007-07-18

申请人： Shmaryu Shvartsman

发明人： Shmaryu Shvartsman

IPC分类号： G01V3/00

CPC分类号： G06F17/50 ,  G01R33/385

摘要： The present invention relates to a method of discretization of the continuous current solution of a gradient coil design that allows satisfaction of the target field quality characteristics as well as other characteristics such as minimization of the energy/inductance, minimization of the residual eddy current effect, minimization of the thrust forces on the coil and cold shields, coil resistance thus the power dissipated by the coil, etc. The method of optimized gradient coil design can be applied to the design of axial or transverse gradient coils. The method of this invention includes the steps of defining at least one, and more commonly numerous performance characteristics of the desired gradient coil, concurrently varying discretization parameters to develop numerous possible hypothetical gradient coil designs, evaluating the designs to determine whether the defined performance characteristics are met by each design and selecting one design.

摘要翻译： 本发明涉及一种梯度线圈设计的连续电流解离方法，其允许满足目标场质量特性以及诸如能量/电感的最小化，残余涡流效应的最小化等其他特性， 线圈和冷屏蔽上的推力的最小化，线圈电阻因此由线圈消耗的功率等。优化的梯度线圈设计的方法可以应用于轴向或横向梯度线圈的设计。 本发明的方法包括以下步骤：定义所需梯度线圈的至少一个并且更常见的许多性能特征，同时改变离散参数以开发许多可能的假设梯度线圈设计，评估设计以确定定义的性能特征是 通过每个设计进行会议并选择一个设计。

公开(公告)号：US20090024966A1

公开(公告)日：2009-01-22

申请号：US11779445

申请日：2007-07-18

申请人： Shmaryu Shvartsman

发明人： Shmaryu Shvartsman

IPC分类号： G06F17/50

CPC分类号： G06F17/50 ,  G01R33/385

摘要： The present invention relates to a method of discretization of the continuous current solution of a gradient coil design that allows satisfaction of the target field quality characteristics as well as other characteristics such as minimization of the energy/inductance, minimization of the residual eddy current effect, minimization of the thrust forces on the coil and cold shields, coil resistance thus the power dissipated by the coil, etc. The method of optimized gradient coil design can be applied to the design of axial or transverse gradient coils. The method of this invention includes the steps of defining at least one, and more commonly numerous performance characteristics of the desired gradient coil, concurrently varying discretization parameters to develop numerous possible hypothetical gradient coil designs, evaluating the designs to determine whether the defined performance characteristics are met by each design and selecting one design.

摘要翻译： 本发明涉及一种梯度线圈设计的连续电流解离方法，其允许满足目标场质量特性以及诸如能量/电感的最小化，残余涡流效应的最小化等其他特性， 线圈和冷屏蔽上的推力的最小化，线圈电阻因此由线圈消耗的功率等。优化的梯度线圈设计的方法可以应用于轴向或横向梯度线圈的设计。 本发明的方法包括以下步骤：定义所需梯度线圈的至少一个并且更常见的许多性能特征，同时改变离散参数以开发许多可能的假设梯度线圈设计，评估设计以确定定义的性能特征是 通过每个设计进行会议并选择一个设计。