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Effects of inhomogeneous regions on electric potentials and magnetic fields: Two special cases

机译：不均匀区域对电势和磁场的影响：两种特殊情况

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The effects of inhomogeneous regions on electric potentials and magnetic fields are compared for two special cases. The first case is for measurements far from the sources and inhomogeneous regions for which it is shown that the effects on both types of measurements are exactly the same. This means that both types of measurements contain the same information about the inhomogeneous regions. The second case is for the effects on measurements near a spherical inhomogeneous region. Equations are derived for the electric potentials and magnetic fields produced by dipolar sources near an inhomogeneous sphere. These equations show that the effects on the two types of measurements are generally the same. A sphere whose conductivity is less than the rest of the volume conductor decreases the potentials and fields of sources perpendicular to the sphere, but increases the potentials and fields of sources tangential to it; a sphere with greater conductivity has the opposite effects. The relative amplitudes of these changes are very nearly the same for potentials and fields. The spheres also produce very nearly the same shifts in the potential and field patterns. The only significant differences in the effects occur for a tangential dipole near a highly conductive sphere for which the field pattern is shifted more than the potential pattern, and the field pattern is distorted. These differences may be useful in obtaining more accurate information about sources in the body.
机译：对于两种特殊情况，比较了不均匀区域对电势和磁场的影响。第一种情况是用于远离源和非均匀区域的测量，对于这两种情况，已证明对两种类型的测量的影响是完全相同的。这意味着两种类型的测量都包含有关不均匀区域的相同信息。第二种情况是对球形不均匀区域附近的测量的影响。对于不均匀球体附近的偶极子源产生的电势和磁场，可以导出方程。这些方程式表明，对两种类型的测量的影响通常是相同的。电导率小于体积导体其余部分的球体会减小垂直于球体的源的电位和场，但会增加与球体相切的源的电位和场；电导率更高的球具有相反的效果。对于电位和场，这些变化的相对幅度几乎相同。球体在电位和场模式上也会产生几乎相同的变化。效应的唯一显着差异发生在高导电性球体附近的切向偶极子上，对于该切向偶极子，场模式比电位模式偏移更大，并且场模式失真。这些差异可能有助于获取有关人体来源的更准确信息。

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    《Journal of Applied Physics》 |1982年第12期|P.9192-9197|共6页
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  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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