用于磁共振成像的有源开口环超材料板
Active split-ring metamaterial slabs for magnetic resonance imaging
摘要：
在这项工作中，它是分析能力的开口环超材料板与零/高磁导率拒绝/限制射频磁场在磁共振成像系统。使用均匀化程序，分裂环板已被设计和制造工作在1.5T的系统。由成对的交叉二极管组成的有源元件插入在开口环中。利用这些元件，板的磁导率可以在与发射体线圈的强激励场相互作用时的单位值与组织中的质子产生的弱场相互作用时的零值或高值之间自动切换。实验表明，不同的配置，这些板坯可以帮助本地增加的信号噪声比。
英文摘要：
In this work, it is analyzed the ability of split-ring metamaterial slabs with zero/high permeability to reject/confine the radiofrequency magnetic field in magnetic resonance imaging systems. Using an homogenization procedure, split-ring slabs have been designed and fabricated to work in a 1.5T system. Active elements consisting of pairs of crossed diodes are inserted in the split-rings. With these elements, the permeability of the slabs can be automatically switched between a unity value when interacting with the strong excitation field of the transmitting body coil, and zero or high values when interacting with the weak field produced by protons in tissue. Experiments are shown for different configurations where these slabs can help to locally increase the signal-to-noise-ratio.
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