Quadrature combiner
    1.
    发明授权
    Quadrature combiner 失效
    正交组合器

    公开(公告)号:US4833429A

    公开(公告)日:1989-05-23

    申请号:US194974

    申请日:1988-05-17

    IPC分类号: G01R33/341

    CPC分类号: G01R33/3678

    摘要: A quadrature coil combiner for phase shifting the pulses and signals of a quadrature coil system used in magnetic resonance (MR) systems to selectively combine or cancel the pulses and signals transmitted and received. The combiner comprises a first and a second conductor for coupling a first and a second coil respectively of the quadrature coil system to a transmit-receive circuit of the MR system. The first conductor comprises an insertable .pi./2 radian delay. The second conductor includes a fixed .pi./2 radian delay. At least one of either the fixed delay or the insertable delay is a quarter wavelength cable whereby active elements are minimized.

    摘要翻译: 一种正交线圈组合器,用于对在磁共振(MR)系统中使用的正交线圈系统的脉冲和信号进行相移,以选择性地组合或取消发射和接收的脉冲和信号。 组合器包括用于将正交线圈系统的第一和第二线圈耦合到MR系统的发射 - 接收电路的第一和第二导体。 第一导体包括可插入的π/ 2弧度延迟。 第二导体包括固定的pi / 2弧度延迟。 固定延迟或可插入延迟中的至少一个是四分之一波长的电缆,由此有源元件被最小化。

    Broadband matching and decoupling network
    2.
    发明授权
    Broadband matching and decoupling network 失效
    宽带匹配和去耦网络

    公开(公告)号:US4901022A

    公开(公告)日:1990-02-13

    申请号:US374552

    申请日:1989-07-05

    IPC分类号: G01R33/36

    CPC分类号: G01R33/3628

    摘要: A broadband matching and decoupling network for matching RF coils to an MR system at more than one Larmor frequency using coaxial cable that is equal to 1/4.lambda. at the lower Larmor frequency and an odd multiple of 1/4.lambda. at the higher Larmor frequency.

    摘要翻译: 宽带匹配和去耦网络,用于使用同轴电缆将RF线圈与MR系统匹配,该同轴电缆在较低的拉莫尔频率处等于1/4λ,在较高拉莫尔频率处的1/4λ的奇数倍 。