MAGNETIC-FIELDS OF A DIPOLE IN SPECIAL VOLUME CONDUCTOR SHAPES
MAGNETIC-FIELDS OF A DIPOLE IN SPECIAL VOLUME CONDUCTOR SHAPES
复制标题
DOI：
10.1109/tbme.1977.326145
复制
发表时间：
1977-01-01
影响因子：
4.6
通讯作者：
COHEN, D
中科院分区：
文献类型：
--
作者：
CUFFIN, BN;COHEN, D
给出了电流偶极子在4种基本体积导体形状下产生的磁场表达式。这些形状分别是半无限体积、球体、长球体（蛋形）和扁球体（铁饼形）。后三种形状接近人类头部的形状，可以作为理解大脑磁场测量的基础。为了研究导体和非导体之间最简单的边界的影响，引入了半无限体积。字段的表达式以一种将总字段分成两部分的形式表示。一部分是由于偶极子本身（偶极子场）；另一种是由于偶极子在体积导体中产生的电流（体积电流场）。给出了每个形状的总场和体积电流场的代表性图。对于这些形状，垂直于体积导体表面的总场分量完全或大部分是由偶极子单独产生的。因此，测量和使用该元件将大大减少从体外测量确定体内电活动来源的复杂性，因为它消除了处理体积电流场的必要性。
Expressions were presented for the magnetic fields produced by current dipoles in 4 basic volume conductor shapes. These shapes were the semi-infinite volume, the sphere, the prolate spheroid (egg-shape) and the oblate spheroid (discus-shape). The latter 3 shapes approximate the shape of the human head and can serve as a basis for understanding the measurements of the brain''s magnetic fields. The semi-infinite volume was included in order to investigate the effect of the simplest boundary between a conductor and nonconductor. The expressions for the fields were presented in a form which separates the total field into 2 parts. One part is due to the dipole alone (the dipole field); the other is due to the current generated in the volume conductor by the dipole (the volume current field). Representative plots of the total field and the volume current field were presented for each shape. For these shapes the component of the total field normal to the surface of the volume conductor is produced completely or in large part by the dipole alone. Therefore, measurement and use of this component will greatly reduce the complexity of determining the sources of electrical activity inside a body from measurements outside the body by removing the necessity of dealing with the volume current field.