Eddy current disruption: effect on nuclear magnetic resonance coil impedance and power loss.
Eddy current disruption: effect on nuclear magnetic resonance coil impedance and power loss.
复制标题
涡流干扰：对核磁共振线圈阻抗和功率损耗的影响。
DOI：
10.1118/1.596336
复制
发表时间：
1989
期刊：
影响因子：
3.8
通讯作者：
Harpen,MD
中科院分区：
文献类型：
--
作者：
Harpen,MD
我们提出了一种理论发展和实验验证的描述功率损耗和样品电阻在核磁共振射频线圈中损耗样品的样品几何形状，其中涡流流线从通常假设的圆形路径中断。特别处理的是有损半球的情况。该问题在两个方向上都得到了解决；以平行和垂直于半球平面的感应。这个分析的结果，以及由Hoult和Lauterbur提出的全球体的结果，与各种样品电导率和取向的观察结果进行了比较。
We present a theoretical development and experimental verification of a description of power loss and sample resistance for a lossy sample in a nuclear magnetic resonance radio frequency coil for a sample geometry where the eddy current streamlines are disrupted from their usually assumed circular paths. Specifically treated is the case of a lossy hemisphere. The problem is solved for two orientations; with the induction parallel and perpendicular to the flat surface of the hemisphere. Results of this analysis as well as those for the full sphere as presented by Hoult and Lauterbur are compared with observation for a variety of sample conductivities and orientation.