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    B1 field control in magnetic resonance imaging
    1.
    发明申请
    B1 field control in magnetic resonance imaging 有权
    B1磁场成像磁场控制

    公开(公告)号：US20070108976A1

    公开(公告)日：2007-05-17

    申请号：US10595582

    申请日：2004-10-07

    申请人： Michael Morich ,  Gordon DeMeester ,  Zhiyong Zhai

    发明人： Michael Morich ,  Gordon DeMeester ,  Zhiyong Zhai

    IPC分类号： G01V3/00 ,  A61B5/05

    CPC分类号： G01R33/583 ,  G01R33/4835

    摘要： Multi-slice magnetic resonance imaging of a region of interest of an imaging subject (16) is performed using a radio frequency coil (40) arranged to generate a B1 magnetic field in the region of interest. One or more processors (44, 82, 88, 110) determine a B1 field value for each slice that is representative of the B1 field over a selected area of the slice, accounting for subject effects on the BI field, and determine an adjusted per-slice radio frequency excitation for each slice that adjusts the B1 field value for the slice to a selected value. A magnetic resonance imaging system (10, 44, 46, 50, 52) acquires magnetic resonance imaging data for each slice using the adjusted per-slice radio frequency excitation for that slice. A reconstruction processor (58) reconstructs the acquired magnetic resonance imaging data into a reconstructed image representation.

    摘要翻译： 使用布置成在感兴趣区域中产生B 1磁场的射频线圈（40）来执行成像对象（16）感兴趣区域的多层磁共振成像。 一个或多个处理器（44,82,88,110）确定代表在片段的选定区域上的B1字段的每个片段的B1字段值，以考虑BI字段上的对象影响，并且确定每个 对于每个切片，将切片的B SUB字段值调整为选定的值，以实现 - 射线射频激励。 磁共振成像系统（10,44,46,50,52）使用针对该切片的调节的每切片射频激励获取每个切片的磁共振成像数据。 重建处理器（58）将所获取的磁共振成像数据重建为重建图像表示。

    Self-shielded gradient field coil for magnetic resonance imaging
    3.
    发明申请
    Self-shielded gradient field coil for magnetic resonance imaging 失效
    用于磁共振成像的自屏蔽梯度场线圈

    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。

    ACTIVE RESISTIVE SHIMMING FOR MRI DEVICES
    4.
    发明申请
    ACTIVE RESISTIVE SHIMMING FOR MRI DEVICES 有权
    用于MRI设备的主动电阻成像

    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。

    METHOD AND APPARATUS FOR SHIELDING A LINEAR ACCELERATOR AND A MAGNETIC RESONANCE IMAGING DEVICE FROM EACH OTHER
    5.
    发明申请
    METHOD AND APPARATUS FOR SHIELDING A LINEAR ACCELERATOR AND A MAGNETIC RESONANCE IMAGING DEVICE FROM EACH OTHER 有权
    用于屏蔽线性加速器的方法和装置以及来自每个其它的磁性谐振成像装置

    公开(公告)号：US20110012593A1

    公开(公告)日：2011-01-20

    申请号：US12837309

    申请日：2010-07-15

    申请人： Shmaryu M. Shvartsman ,  Gordon DeMeester ,  James F. Dempsey ,  John Lester Patrick

    发明人： Shmaryu M. Shvartsman ,  Gordon DeMeester ,  James F. Dempsey ,  John Lester Patrick

    IPC分类号： G01R33/44

    CPC分类号： A61N5/1049 ,  A61B5/055 ,  A61B5/0555 ,  A61N5/1039 ,  A61N5/1081 ,  A61N2005/1055 ,  A61N2005/1088 ,  A61N2005/1089 ,  A61N2005/1094 ,  G01R33/28 ,  G01R33/3806 ,  G01R33/42 ,  G01R33/421 ,  G01R33/4808

    摘要： A radiation therapy system comprises a magnetic resonance imaging (MRI) system combined with an irradiation system, which can include one or more linear accelerators (linacs) that can emit respective radiation beams suitable for radiation therapy. The MRI system includes a split magnet system, comprising first and second main magnets separated by gap. A gantry is positioned in the gap between the main MRI magnets and supports the linac(s) of the irradiation system. The gantry is rotatable independently of the MRI system and can angularly reposition the linac(s). Shielding can also be provided in the form of magnetic and/or RF shielding. Magnetic shielding can be provided for shielding the linac(s) from the magnetic field generated by the MRI magnets. RF shielding can be provided for shielding the MRI system from RF radiation from the linac.

    摘要翻译： 放射治疗系统包括与照射系统组合的磁共振成像（MRI）系统，其可以包括可以发射适合于放射治疗的各个辐射束的一个或多个线性加速器（直线加速器）。 MRI系统包括分裂磁体系统，包括由间隙分开的第一和第二主磁体。 龙门架位于主MRI磁体之间的间隙中，并支撑照射系统的直线加速器。 台架可以独立于MRI系统旋转，并且可以有角度地重新定位直线加速器。 屏蔽也可以以磁性和/或RF屏蔽的形式提供。 可以提供磁屏蔽来屏蔽直线加速器与MRI磁铁产生的磁场。 可以提供射频屏蔽来屏蔽MRI系统免受来自直线加速器的射频辐射。

    Active resistive shimming fro MRI devices
    7.
    发明授权
    Active resistive shimming fro MRI devices 有权
    磁共振成像装置的主动阻力垫片

    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。

    Dynamic Shimset Calibration for Bo Offset
    8.
    发明申请
    Dynamic Shimset Calibration for Bo Offset 审中-公开
    Bo偏移的动态Shimset校准

    公开(公告)号：US20070279060A1

    公开(公告)日：2007-12-06

    申请号：US10598867

    申请日：2005-02-17

    申请人： Wayne Dannels ,  David Foxall ,  Gordon DeMeester

    发明人： Wayne Dannels ,  David Foxall ,  Gordon DeMeester

    IPC分类号： G01R33/38

    CPC分类号： G01R33/56563 ,  G01R33/3875

    摘要： A magnetic resonance imaging scanner includes a main magnet (20) generating a main B0 magnetic field, one or more shim coils (60) selectively shimming the main B0 magnetic field at selected shim currents, and a processor (70) executing a process including determining a magnitude shift of the main B0 magnetic field responsive to the selective shimming and performing a correction during the energizing to correct for the determined magnitude shift of the main B0 magnetic field. The performed correction includes one of (i) selectively energizing a D.C. shim coil (82) to counteract the determined magnitude shift of the main B0 magnetic field and (ii) computing a magnetic resonance frequency corresponding to the main B0 magnetic field including the determined magnitude shift and tuning a radio frequency transceiver (44, 46) to the computed magnetic resonance frequency.

    摘要翻译： 磁共振成像扫描器包括产生主B 0磁场的主磁体（20），一个或多个衬垫线圈（60）有选择地将主B 0磁场 以及处理器（70），其执行处理，所述处理包括响应于所述选择性匀场来确定主B 0 0磁场的幅度位移，并且在通电期间执行校正以校正所确定的 主磁场的磁场的幅度偏移。 执行的校正包括以下之一：（i）选择性地激励DC垫片线圈（82）以抵消所确定的主B 0磁场的幅度偏移，以及（ii）计算对应于 包括确定的幅度偏移的主B 0 0磁场，并且将射频收发器（44,46）调谐到所计算的磁共振频率。

    Table position sensing for magnetic resonance imaging
    9.
    发明申请
    Table position sensing for magnetic resonance imaging 有权
    用于磁共振成像的表位置检测

    公开(公告)号：US20060142655A1

    公开(公告)日：2006-06-29

    申请号：US10560695

    申请日：2004-06-01

    申请人： Bradford Petot ,  Gordon DeMeester ,  William Amor

    发明人： Bradford Petot ,  Gordon DeMeester ,  William Amor

    IPC分类号： A61B5/05

    CPC分类号： A61B5/0555 ,  A61B5/704 ,  A61B5/706 ,  A61B6/04 ,  A61B6/0407 ,  A61B6/0492 ,  G01R33/28 ,  G01R33/56375

    摘要： An MRI apparatus is provided. The MRI apparatus includes a main magnet (12) for generating a main magnetic field in an examination region, a plurality of gradient magnets (16) for generating magnetic field gradients in the main magnetic field, a radio frequency coil (22) for transmitting radio frequency signals into the examination region and exciting magnetic resonance in a subject disposed therein, and a radio frequency coil for receiving the magnetic resonance signals from the subject. The MRI apparatus also includes subject support (52) for supporting the subject, a position controller (60) for controlling the position of the subject support within the examination region, and a position encoder (53) for directly measuring the position of the subject support.

    摘要翻译： 提供MRI装置。 MRI装置包括用于在检查区域中产生主磁场的主磁体（12），用于在主磁场中产生磁场梯度的多个梯度磁体（16），用于发射无线电的射频线圈 频率信号进入检查区域并激励被设置在其中的被摄体的磁共振，以及射频线圈，用于接收来自被检体的磁共振信号。 MRI装置还包括用于支撑被检体的被检体支架（52），用于控制检查区域内的被检体的位置的位置控制器（60），以及用于直接测量被检体支架 。