  Recent femtoscopic measurements involving the use of an imaging technique and
a newly developed moment analysis are presented and discussed. We show that
this new paradigm allows robust investigation of reaction dynamics for which
the sound speed $c_s \neq 0$ during an extended hadronization period. Source
functions extracted for charged pions produced in Au+Au and Pb+Pb collisions
show non-Gaussian tails for a broad selection of collision energies. The ratio
of the RMS radii of these source functions in the out and side directions are
found to be greater than 1, suggesting a finite emission time for pions.
