> Not sure. Your Dropbox links give an error "Can't find the page you're
> looking for."
>

The coordinates depend on the file format and perhaps the viewer you are
using. I do not pay attention to the coordinates as long as I can see the
results and know they are in the correct orientation and are properly
coregistered to the reference image I am using. In that case you could just
use the coordinates of the viewer. I use MRIcron and MeVisLab to display
results as overlays along with other images I have processed such as PET.

Also I am puzzled why you would want to do a group analysis of SPECT
results. They vary so dramatically for different patients.