  Tracking a real trajectory of a quantum particle still has been treated as
the interpretation problem. It shall be expressed by a Brownian (stochastic)
motion suggested by E. Nelson, however, the well-defined mechanism of field
generation from a stochastic particle hasn't been proposed yet. For the
improvement of this, I propose the extension of Nelson's quantum dynamics, for
describing a relativistic scalar electron with its radiation equivalent to the
Klein-Gordon particle and field system.
