Geselowitz D B
Bioengineering Program, Pennsylvania State University, USA.
IEEE Eng Med Biol Mag. 1998 Jan-Feb;17(1):128-32. doi: 10.1109/51.646230.
It is convenient to select a reference point for recording ECG potentials on the torso or EEG potentials on the scalp. The body is a bounded, insulated volume conductor. As such, it is meaningless to seek a point whose potential is at true zero. The choice of a particular reference, and hence the amplitude assigned to a contour, does not change in any way the biophysical information contained in the potential distribution. It does not in any way change the relation between source and potential, except for an additive constant of no physical significance. Standardization of a reference is useful for comparing, more directly, data from different laboratories. An agreed upon reference is necessary when a limited number of leads are used for diagnosis. In the case of the electrocardiogram, the generally agreed upon reference is the WCT. The issue of the zero of potential seems to arouse passions that may sometimes inhibit scientific discourse.
选择一个参考点来记录躯干上的心电图电位或头皮上的脑电图电位很方便。人体是一个有界的、绝缘的容积导体。因此，寻找一个电位为真正零值的点是没有意义的。选择特定的参考点，以及因此赋予轮廓的幅度，并不会以任何方式改变电位分布中包含的生物物理信息。它不会以任何方式改变源与电位之间的关系，除了一个没有物理意义的加性常数。参考点的标准化有助于更直接地比较来自不同实验室的数据。当使用有限数量的导联进行诊断时，商定一个参考点是必要的。在心电图的情况下，普遍商定的参考点是威尔逊中心端（WCT）。电位零点的问题似乎会引发一些情绪，有时可能会抑制科学讨论。
