Lorentz-force-induced motion in conductive media
Lorentz-force-induced motion in conductive media
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DOI：
10.1016/j.mri.2005.02.014
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发表时间：
2005-06-01
影响因子：
2.5
通讯作者：
Ehman, RL
中科院分区：
文献类型：
--
作者：
Basford, AT;Basford, JR;Ehman, RL
该项目旨在评估MRI成像是否可以检测导电样品中的洛伦兹力诱导运动。通过在放置在1.5-T MRI扫描仪场中的2%琼脂和18%牛凝胶上施加交流电压来进行实验。运动敏感的时间门控MRI图像，获得和分析与定制开发的软件在以前的研究中使用揭示了生产的运动在琼脂和凝胶样品。运动在垂直于样品的平面中最明显，并且当电流路径垂直于扫描仪的磁场时具有最大幅度。这些发现与洛伦兹力的矢量叉积性质是相容的，并表明在导电样品中洛伦兹力引起的运动的成像是可行的。这种方法是否可以扩展到研究电活性组织，如外周神经，大脑和心脏，还有待观察。(c)2005年爱思唯尔公司All rights reserved.
This project was designed to assess whether MRI imaging could detect Lorentz-force-induced motion in conductive samples. Experiments were performed by applying alternating voltages across 2 % agar and 18 % bovine gels placed in the field of a 1.5-T MRI scanner. Motion-sensitized time-gated MRI images that were obtained and analyzed with custom-developed software used in previous studies revealed the production of movement in both agar and gel samples. Motion was most pronounced in the plane vertical to the sample and had the greatest amplitude when the current path was perpendicular to the scanner's magnetic field. These findings are compatible with the vector cross product nature of the Lorentz force and suggest that the imaging of Lorentz-force-induced motion in conductive samples is feasible. Whether this approach can be extended to study electrically active tissues such as the peripheral nerves, brain and heart remains to be seen. (c) 2005 Elsevier Inc. All rights reserved.