SIEMENS De-identified DICOM load:  corrected the logic so the 4D dataset could be logically combined and loaded properly.  The problem was in De-dentifies replacing the TAG_PATIENT_ID differently for each timepoint.

Two timepoint T0(2009) and T1(2011) were
a) Whole brain segmented for masks M0 and M1.
b) Brain masks M0 and M1 were co-registered.


Result is below:
M0 - red mask (earlier)
M1 - blue mask (later)
Purple (red+blue) = overlap of M0 & M1