Floating shield current suppression trap
Floating shield current suppression trap
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DOI：
10.1002/cmr.b.20008
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发表时间：
2004-04-01
影响因子：
0.9
通讯作者：
Menon, A
中科院分区：
文献类型：
--
作者：
Seeber, DA;Jevtic, I;Menon, A
屏蔽电流或共模电流会影响线圈调谐、相控阵线圈中的线圈间耦合、图像不均匀性，最重要的是会导致严重的患者灼伤。传统上，在MRI中，屏蔽电流通过电缆陷波器降低;它们由缠绕的同轴电缆电感器组成，通过同轴电缆接地屏蔽端匝之间的电容器调谐到所需的谐振频率。这种方法增加了损耗并影响线圈和前置放大器之间的总相位距离。我们提出了一个电缆陷阱，不连接或焊接到电缆，是完全分裂，允许轻松地安装在任何电缆，而不影响任何线圈参数（调谐或相位长度）。多根电缆可以放置在屏蔽电流陷阱内，以同时衰减来自多达八根电缆的屏蔽电流，如目前设计的那样。屏蔽电流陷波器在64 MHz时可将屏蔽电流降低约30 dB。(C)2004 Wiley Periodicals，Inc.
Shield currents or common mode currents affect coil tuning, coil-to-coil coupling in phased array coils, image inhomogeneity, and most importantly can cause serious patient burns. Traditionally in MRI, shield currents are reduced by cable traps; they consist of a wound coaxial cable inductor tuned to the desired resonance frequency by a capacitor between end turns of the coaxial cable ground shield. This method increases losses and effects the overall phase distance between the coil and the preamplifiers. We present a cable trap that does not connect or solder to the cable and is completely splitable, allowing easy fitting over any cable without affecting any coil parameters (tuning or phase length). Multiple cables can be placed inside the shield current trap to simultaneously attenuate the shield currents from up to eight cables, as currently designed. The shield current trap reduces shield currents at 64 MHz by similar to30 dB. (C) 2004 Wiley Periodicals, Inc.