Neurostimulation systems: Assessment of magnetic field interactions associated with 1.5-and 3-Tesla MR systems
Neurostimulation systems: Assessment of magnetic field interactions associated with 1.5-and 3-Tesla MR systems
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DOI：
10.1002/jmri.20224
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发表时间：
2005-01-01
影响因子：
4.4
通讯作者：
Shellock, FG
中科院分区：
文献类型：
--
作者：
Baker, KB;Nyenhuis, JA;Shellock, FG
目的：为评价植入式神经刺激系统所用植入式脉冲发生器（IPG）和射频（RF）接收器在1.5-和3-T下的磁场相互作用，材料和方法：测定了用于神经刺激系统的10种器械（7种IPG，3种RF接收器）的磁致位移力和扭矩。位移力和扭矩进行了评估，在不同的位置在1.5和3特斯拉MR systems.Results：四个IPG表现出的力比（磁吸引力/设备重量）大于1.0，与整体幅度的力比增加，显着比较时，1.5特斯拉的3特斯拉MR系统。在7个受试IPG中，1个表现出扭矩比（磁致扭矩/器械重量和长度的乘积）大于1.0。射频接收器在1.5和3 T下均显示出相对较强的磁场相互作用，力和扭矩比大于1.0。结论：测试的神经刺激植入物显示出不同程度的磁场相互作用，7个IPG中有4个和3个射频接收器显示出至少一个MR感应力或扭矩值大于重力效应。这些发现对接受MRI检查的植入这些植入物的患者具有重要意义。
Purpose: To evaluate magnetic field interactions at 1.5- and 3-Tesla for implantable pulse generators (IPGs) and radiofrequency (RF) receivers used for implantable neurostimulation systems.Materials and Methods: Measurements of magnetically induced displacement force and torque were determined for 10 devices (seven IPGs, three RF receivers),used for neurostimulation systems. Displacement force and torque were assessed at various positions in 1.5- and 3-Tesla MR systems using standardized techniques.Results: Four IPGs exhibited force ratios (magnetic attraction force/device weight) greater than 1.0, with the overall magnitude of the force ratio increasing, significantly when comparing the 1.5-Tesla to the 3-Tesla MR system. Of the seven IPGs tested, one exhibited a torque ratio (magnetic induced torque/product of the device weight,and length) greater than 1.0. The RF receivers displayed relatively strong magnetic field interactions at both 1.5- and 3-Tesla, exhibiting force and torque ratios greater than 1.0.Conclusions: The neurostimulation implants tested exhibited varying degrees of magnetic field interactions, with four of the seven IPGs and the three RF receivers exhibiting at least one MR-induced force or torque value greater than the effect of gravity. These findings have important implications for Patients with these implants who are referred for MRI examinations.