Evaluation of magnetic resonance imaging issues for implantable microfabricated magnetic actuators.
Evaluation of magnetic resonance imaging issues for implantable microfabricated magnetic actuators.
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DOI：
10.1007/s10544-013-9815-3
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发表时间：
2014-02
影响因子：
2.8
通讯作者：
Judy, Jack W.
中科院分区：
文献类型：
--
作者：
Lee, Hyowon;Xu, Qing;Shellock, Frank G.;Bergsneider, Marvin;Judy, Jack W.
研究了微制造扭转磁致动器在承受MR系统产生的强静态场（7 T）和时变场梯度（17 T/m）时的机械鲁棒性。对30个器件暴露于均匀强磁场和非均匀强磁场前后的静态和动态力学特性进行了定量测量。结果表明，静态和动态机械性能均无统计学显著变化，这缓解了在本评估所用条件下与MR系统相关的这些器械的机械稳定性问题。还在3-T/128-MHz MR系统中测量了MR致热。结果显示，由于磁性微致动器阵列的存在，温度的增加最小（1.6 °C）。最后，量化了由磁性微器件产生的MR图像伪影的大小。器械造成的信号损失大约是器械尺寸的四倍。
The mechanical robustness of microfabricated torsional magnetic actuators in withstanding the strong static fields (7 T) and time-varying field gradients (17 T/m) produced by an MR system was studied in this investigation. The static and dynamic mechanical characteristics of 30 devices were quantitatively measured before and after exposure to both strong uniform and non-uniform magnetic fields. The results showed no statistically significant change in both the static and dynamic mechanical performance, which mitigate concerns about the mechanical stability of these devices in association with MR systems under the conditions used for this assessment. The MR-induced heating was also measured in a 3-T/128-MHz MR system. The results showed a minimal increase (1.6 °C) in temperature due to the presence of the magnetic microactuator array. Finally, the size of the MR-image artifacts created by the magnetic microdevices were quantified. The signal loss caused by the devices was approximately four times greater than the size of the device.
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影响因子：
2.8
作者：
Kosa, Gabor;Jakab, Peter;Szekely, Gabor;Hata, Nobuhiko
通讯作者：
Hata, Nobuhiko
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3.3
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