Cohen D, Hosaka H
J Electrocardiol. 1976;9(4):409-17. doi: 10.1016/s0022-0736(76)80041-6.
To understand the MCG, electrical models of the heart must be used in which the basic building-block is usually the current dipole. The dipole's magnetic field is generally made up of two parts: 1. the contribution by the dipole element itself, which is mathematically simple; 2. the contribution by the current generated in the volume conductor by the dipole, which is complicated and depends on the boundaries; for special boundaries this contribution is zero to Bz, the component of magnetic field which is normal to the boundary. This applies to the boundaries of the semi-infinite volume conductor, the infinite slab, and the sphere. This property allows great simplification in solving the magnetic forward and inverse problems. Because of its importance, it is proven with electrolytic tank experiments. Based on this property, a method is presented for estimating the presence of those dipole combinations which produce a suppressed surface potential; it consists of a visual examination of an "arrow" display of Bz.
为了理解心磁图，必须使用心脏的电模型，其中基本构建单元通常是电流偶极子。偶极子的磁场一般由两部分组成：1. 偶极子元件本身的贡献，这在数学上很简单；2. 偶极子在容积导体中产生的电流的贡献，这很复杂且取决于边界；对于特殊边界，该贡献对于磁场垂直于边界的分量Bz为零。这适用于半无限容积导体、无限平板和球体的边界。此特性在求解磁正向和逆向问题时可实现极大简化。由于其重要性，通过电解槽实验得到了证明。基于此特性，提出了一种估计那些产生表面电位抑制的偶极子组合存在情况的方法；它包括对Bz的“箭头”显示进行目视检查。
