Hosaka H, Cohen D
J Electrocardiol. 1976;9(4):426-32. doi: 10.1016/s0022-0736(76)80043-x.
Previously it was shown that Bn, the component of the heart's magnetic field which is normal to the chest, is in large part produced directly by the generators in the heart; the volume-current (or boundary) contribution to Bn is relatively small. It was also shown that the distribution of Bn across the chest could be displayed as an arrow map which visually reveals the underlying dipole sources, in particular those dipole combinations which produce suppresed surface potentials but undiminished Bn. Arrow maps of two normal and one abnormal heart subject are here presented. The purpose is to demonstrate that the generators of the MCG can be coarsely estimated by visual inspection of these maps. The generators of the normal hearts are visually determined by comparing their arrow maps with those computed from the Cuffin-Selvester model. The generators of the abnormal heart are visually determined by trial-and-error, with the aid of a simple computing program. These examples are the first determinations, however approximate, of multi-dipole generators of the actual MCGs. Some possible new information is indicated.
先前的研究表明，心脏磁场垂直于胸部的分量Bn在很大程度上是由心脏中的发生器直接产生的；体积电流（或边界）对Bn的贡献相对较小。研究还表明，Bn在胸部的分布可以显示为箭头图，直观地揭示潜在的偶极子源，特别是那些产生表面电位抑制但Bn未减弱的偶极子组合。这里展示了两个正常心脏受试者和一个异常心脏受试者的箭头图。目的是证明通过目视检查这些图可以粗略估计MCG的发生器。通过将正常心脏的箭头图与根据Cuffin-Selvester模型计算的图进行比较，目视确定正常心脏的发生器。借助一个简单的计算程序，通过反复试验目视确定异常心脏的发生器。这些例子是对实际MCG的多偶极子发生器的首次确定，尽管是近似的。还指出了一些可能的新信息。
