  We discuss the far-field spatio-temporal cross-correlations of waves
multiple-scattered in a turbid medium in which is embedded a hidden
heterogeneous region (inclusion) characterized by a distinct scatterer dynamics
(as compared to the rest of the medium). We show that the spatio-temporal
correlation is affected by the inclusion which suggests a new method of imaging
in turbid media. Our results allow qualitative interpretation in terms of
diffraction theory: the cross-correlation of scattered waves behaves similarly
to the intensity of a wave diffracted by an aperture.
