Fig. 20.2 The similarity between the lead fields of certain electric and magnetic leads are illustrated.
If the magnetic field is measured in such an orientation (in the x direction in this example) and location,
that the symmetry axis is located far from the region of the heart, the magnetic lead field in the heart's region
is similar to the electric lead field of a lead (lead II in this example), which is oriented normal to
the symmetry axis of the magnetic lead. This similarity may also be verified from the similarity of
the corresponding detected signals.