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    Double-sided RF shield for RF coil contained within gradient coils used in high speed NMR imaging
    1.
    发明授权
    Double-sided RF shield for RF coil contained within gradient coils used in high speed NMR imaging 失效
    包含在用于高速NMR成像的梯度线圈内的RF线圈的双面RF屏蔽

    公开(公告)号：US5680046A

    公开(公告)日：1997-10-21

    申请号：US286366

    申请日：1994-08-05

    申请人： Perry Scott Frederick ,  Walter Albert Zimmermann ,  Peter Bernard Roemer

    发明人： Perry Scott Frederick ,  Walter Albert Zimmermann ,  Peter Bernard Roemer

    IPC分类号： A61B5/055 ,  G01R33/422 ,  G01Y3/00

    CPC分类号： G01R33/422

    摘要： A magnetic resonance system includes a cylindrical shield disposed between a quadrature RF coil and surrounding gradient coils. The shield includes a pair of copper sheets separated by an insulating dielectric sheet. A pattern formed by cuts in one copper sheet aligns with the currents induced in the shield by one of the RF quadrature fields, and a pattern formed by cuts in the other copper shield aligns with the other RF quadrature field. The copper sheets are shorted together to prevent voltage breakdowns and short cuts are made in each to prevent gradient induced eddy currents.

    摘要翻译： 磁共振系统包括设置在正交RF线圈和周围梯度线圈之间的圆柱形屏蔽。 屏蔽包括由绝缘介电片隔开的一对铜片。 由一个铜片中的切口形成的图案与通过RF正交场中的一个场合在屏蔽中感应的电流对准，并且由另一个铜屏蔽中的切口形成的图案与另一个RF正交场对准。 铜片短路在一起以防止电压击穿，并且在每个铜片上进行快速切割以防止梯度诱发的涡流。