Reduction of the radiofrequency heating of metallic devices using a dual-drive birdcage coil
Reduction of the radiofrequency heating of metallic devices using a dual-drive birdcage coil
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DOI：
10.1002/mrm.24316
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发表时间：
2013-03-01
影响因子：
3.3
通讯作者：
Atalar, Ergin
中科院分区：
文献类型：
--
作者：
Eryaman, Yigitcan;Turk, Esra Abaci;Atalar, Ergin
在这项工作中，它表明，双驱动鸟笼线圈可用于减少在磁共振成像过程中的金属器械的射频加热。通过控制鸟笼线圈的两个通道的激励电流，可以将电极导线尖端附近感应的射频电流设置为零。为了监测电流，测量了电极导线尖端附近的图像伪影。使用双驱动鸟笼线圈控制电场分布。通过该方法，电极导线电流和电极导线头端温度大幅降低[使用正交激励时为4.9 ℃]，如体模和动物实验所示。正如志愿者实验所示，翻转角分布的均匀性得到了保留。对于所有激励，翻转角分布的归一化均方根误差小于10%。平均比吸收率增加作为使用不同的激发模式的权衡。Magn Reson Med，2013年。(c)2012 Wiley Periodicals，Inc.
In this work, it is demonstrated that a dual-drive birdcage coil can be used to reduce the radiofrequency heating of metallic devices during magnetic resonance imaging. By controlling the excitation currents of the two channels of a birdcage coil, the radiofrequency current that is induced near the lead tip could be set to zero. To monitor the current, the image artifacts near the lead tips were measured. The electric field distribution was controlled using a dual-drive birdcage coil. With this method, the lead currents and the lead tip temperatures were reduced substantially [4.9 degrees C using quadrature excitation], as demonstrated by phantom and animal experiments. The homogeneity of the flip angle distribution was preserved, as shown by volunteer experiments. The normalized root-mean-square error of the flip angle distribution was less than 10% for all excitations. The average specific absorption rate increased as a trade-off for using different excitation patterns. Magn Reson Med, 2013. (c) 2012 Wiley Periodicals, Inc.