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    Integrated MRI gradient coil and RF screen
    21.
    发明授权
    Integrated MRI gradient coil and RF screen 失效
    集成MRI梯度线圈和射频屏幕

    公开(公告)号：US5406204A

    公开(公告)日：1995-04-11

    申请号：US80413

    申请日：1993-06-21

    Applicant: Michael A. Morich ,  Gordon D. DeMeester ,  John L. Patrick ,  Xueming Zou

    Inventor： Michael A. Morich ,  Gordon D. DeMeester ,  John L. Patrick ,  Xueming Zou

    IPC: G01R33/20 ,  A61B5/055 ,  G01R33/3815 ,  G01R33/385 ,  G01R33/421 ,  G01R33/422

    CPC classification number: G01R33/3815 ,  G01R33/385 ,  G01R33/421 ,  G01R33/422 ,  G01R33/3856 ,  G01R33/4215

    Abstract: The magnetic field assembly of a magnetic resonance imaging device includes an annular superconducting magnet (10) which is mounted within a toroidal vacuum vessel (24). A cylindrical member (26) defines a central bore through which the superconducting magnets generate a temporally constant primary magnetic field. A cylindrical, dielectric former (46) is mounted in the bore displaced a small distance from the cylindrical member. A radio frequency coil (32) is mounted within the cylindrical member defining a patient receiving examination region. An RF shield (34) is mounted around the exterior peripheral surface of the former. Primary gradient coils (40) are mounted around and potted to the exterior of the dielectric former around the RF shield. Gradient shield or secondary coils (44) are potted around an exterior of the cylindrical member within the vacuum chamber. As illustrated in FIG. 3 , when unshielded gradient coils are used, the primary gradient coils and the RF shield are mounted around the outer diameter of the cylindrical member (26).

    Abstract translation: 磁共振成像装置的磁场组件包括安装在环形真空容器（24）内的环形超导磁体（10）。 圆柱形构件（26）限定中心孔，超导磁体通过该中心孔产生时间上不变的初级磁场。 圆柱形电介质成形器（46）安装在距离圆柱形构件较小距离的孔中。 射频线圈（32）安装在限定患者接收检查区域的圆柱形构件内。 RF屏蔽件（34）围绕前者的外周表面安装。 初级梯度线圈（40）围绕RF屏蔽件安装在电介质成形器的外部并且封装在外部。 梯度屏蔽或次级线圈（44）围绕真空室内的圆柱形构件的外部进行灌封。 如图1所示。 如图3所示，当使用非屏蔽梯度线圈时，主梯度线圈和RF屏蔽围绕圆柱形部件（26）的外径安装。

    Technique for driving quadrature dual frequency RF resonators for magnetic resonance spectroscopy/imaging by four-inductive loop over coupling
    22.
    发明授权
    Technique for driving quadrature dual frequency RF resonators for magnetic resonance spectroscopy/imaging by four-inductive loop over coupling 失效
    用于驱动正交双频RF谐振器的技术用于通过四电感耦合耦合进行磁共振光谱/成像

    公开(公告)号：US5365173A

    公开(公告)日：1994-11-15

    申请号：US19234

    申请日：1993-02-18

    Applicant: Xueming Zou ,  David A. Lampman ,  Paul T. Orlando

    Inventor： Xueming Zou ,  David A. Lampman ,  Paul T. Orlando

    IPC: G01R33/34 ,  G01R33/385 ,  G01R33/422 ,  G01V3/00

    CPC classification number: G01R33/341 ,  G01R33/34 ,  G01R33/385 ,  G01R33/422

    Abstract: In a magnetic resonance system, four primary loop circuits (50, 52, 54, 56) are inductively coupled to a resonator coil (32) at 90.degree. intervals around its circumference. The loop circuits are over-coupled to the resonator coil, i.e. they present more than the characteristic resistance of the associated cabling system which causes the maximum current transfer between the loop circuits and the resonator coil to be offset (f.sub.N) in equal amounts in each direction from a natural resonance frequency (f.sub.0) of the resonator coil. In one embodiment, two adjacent primary loop circuits provide for quadrature radio frequency transmission to and from the resonator coil at a first frequency and the other two primary loop circuits provide for quadrature radio frequency transmission to and from the resonator coil at a second resonance frequency. Each of the primary loop circuits includes a tank circuit (62) for blocking the passage of the frequency of the other quadrature primary loop circuit pair. In another embodiment, the third and fourth primary loop circuits are connected with tuning capacitors for adjusting the resonance frequency of the resonator coil relative to radio frequency signals applied and received by the primary loop circuit 180.degree. opposite. This enables the frequency of each quadrature component of a quadrature RF signal to be adjusted separately. Analogously, this enables the resonance frequency of two linear RF signals to be adjusted independently.

    Abstract translation: 在磁共振系统中，四个初级回路电路（50,52,54,56）围绕其圆周以90度间隔感应耦合到谐振器线圈（32）。 环路电路过耦合到谐振器线圈，即它们比相关电缆系统的特性电阻多出现，这导致环路电路和谐振器线圈之间的最大电流传输在每个电路中以相等的量（fN）偏移（fN） 方向从谐振器线圈的固有谐振频率（f0）。 在一个实施例中，两个相邻的主回路电路以第一频率提供到谐振器线圈和从谐振器线圈的正交射频传输，而另外两个主回路电路以第二谐振频率提供到谐振器线圈和从谐振器线圈的正交射频传输。 每个主回路电路包括用于阻止另一正交主回路电路对的频率通过的电路（62）。 在另一个实施例中，第三和第四主回路电路与用于调节谐振器线圈的谐振频率相对于由主回路电路180°相反施加和接收的射频信号的调谐电容器连接。 这使得能够分别调整正交RF信号的每个正交分量的频率。 类似地，这使得可以独立地调节两个线性RF信号的共振频率。

    Sliding-dome and split-top MRI radio frequency quadrature array coil system
    25.
    发明授权
    Sliding-dome and split-top MRI radio frequency quadrature array coil system 有权
    滑动圆顶和分体式MRI射频正交阵列线圈系统

    公开(公告)号：US06577888B1

    公开(公告)日：2003-06-10

    申请号：US09676225

    申请日：2000-09-29

    Applicant: Pei Hsuon Chan ,  Matthias Gyori ,  Mark Xueming Zou

    Inventor： Pei Hsuon Chan ,  Matthias Gyori ,  Mark Xueming Zou

    IPC: A61B5055

    CPC classification number: G01R33/3415 ,  A61B5/0555

    Abstract: An MRI array coil system for neurovascular and spine imaging of a human includes a neck coil having a split top; a dome-like head coil having a dome region, the head coil being slidable between a closed position adjacent to the neck coil and an open position spaced away from the neck coil; a posterior torso coil attached to the neck coil; and an anterior torso coil adapted to cooperate with the posterior coil.

    Abstract translation: 用于人的神经血管和脊柱成像的MRI阵列线圈系统包括具有分裂顶部的颈线圈; 具有圆顶区域的圆顶状头部线圈，所述头部线圈可在邻近所述颈部线圈的闭合位置和与所述颈部线圈间隔开的打开位置之间滑动; 连接到颈圈的后躯体线圈; 以及适于与后线圈配合的前躯干线圈。

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