A method of analyzing the type of tissue of a body portion of a subject. The
method
includes applying an excitation signal to the subject, sensing electrical signals
from the subject responsive to the excitation signal, determining a stationary
impedance map of the body portion responsive to the sensed signals, determining
a change waveform of at least a part of the stationary impedance map, and providing
an indication on a tissue type of at least part of the body portion, responsive
to the change waveform.