公开(公告)号：US06366093B1

公开(公告)日：2002-04-02

申请号：US09615000

申请日：2000-07-12

申请人： Spencer C. Hartman

发明人： Spencer C. Hartman

IPC分类号： G01U300

CPC分类号： G01R33/482

摘要： A re-entrant radio-frequency (RF) TE11-mode cavity resonator allows generating a spatially homogeneous RF magnetic field for magnetic resonance (NMR, MRI) applications. The azimuthal current distribution is truly (continuously) sinusoidal. Moreover, the geometry allows tuning the cavity resonance frequency over a wide range. The resonator includes an outer cylindrical shell, and an inner re-entrant shell extending only along the ends of the outer shell. The magnetic resonance target of interest is placed in the middle region of the outer cylindrical shell. Multiple re-entrant inner shells can be used, particularly if multiple resonances are desirable. The resonator can be driven capacitively or inductively, for example by placing excitation loops in the space between the outer and inner shell. Multiple excitation loops are used to drive the resonator in quadrature. The resonance frequency of the cavity can be tuned by rotating tuning paddles placed between the inner and outer shells.

摘要翻译： 入射射频（RF）TE11模式腔谐振器允许产生用于磁共振（NMR，MRI）应用的空间均匀RF磁场。 方位角电流分布是真正（连续的）正弦曲线。 此外，几何形状允许在宽范围内调谐空腔共振频率。 谐振器包括外圆柱形外壳和仅沿着外壳的端部延伸的内部重入壳。 感兴趣的磁共振靶位于外圆柱壳的中间区域。 可以使用多个重入的内壳，特别是如果需要多个共振时。 谐振器可以通过电容或电感驱动，例如通过将激励环放置在外壳和内壳之间的空间中。 使用多个励磁环来正交驱动谐振器。 可以通过旋转放置在内壳和外壳之间的调谐桨来调节空腔的共振频率。

公开(公告)号：US06236206B1

公开(公告)日：2001-05-22

申请号：US09298619

申请日：1999-04-23

申请人： Spencer C. Hartman ,  Wai Ha Wong

发明人： Spencer C. Hartman ,  Wai Ha Wong

IPC分类号： G01V300

CPC分类号： G01R33/3628 ,  G01R33/34046

摘要： A birdcage coil is globally tuned by a tuning structure to maintain constant RF phase shift for each leg conductor of the birdcage while containing a load. The birdcage coil may be globally tuned by adjusting the capacitances or inductances in a symmetrical manner.

摘要翻译： 鸟笼线圈由调谐结构全局调谐，以在包含负载的同时保持鸟笼的每个腿部导体的恒定的RF相移。 可以通过以对称方式调整电容或电感来全局调谐鸟笼线圈。

公开(公告)号：US6011395A

公开(公告)日：2000-01-04

申请号：US989207

申请日：1997-12-11

申请人： Mark C. Leifer ,  Spencer C. Hartman

发明人： Mark C. Leifer ,  Spencer C. Hartman

IPC分类号： A61B5/055 ,  G01R33/34 ,  G01R33/422 ,  G01V3/00

CPC分类号： G01R33/34046 ,  G01R33/422

摘要： A birdcage coil is operated in a balanced mode through connection of signal ground to a shield surrounding the coil. The driven leg of the coil includes tune capacitors, through which balance is maintained.

摘要翻译： 鸟笼线圈通过将信号接地连接到线圈周围的屏蔽以平衡模式操作。 线圈的从动支腿包括调谐电容器，通过该电容器保持平衡。