used attr.getString to get number of slices since VR is UN.
used attr.getString to get number of slices since VR is UN.

aditiiyer/CERR,aditiiyer/CERR,aditiiyer/CERR,cerr/CERR,aditiiyer/CERR,cerr/CERR,cerr/CERR,aditiiyer/CERR,cerr/CERR,cerr/CERR,cerr/CERR,cerr/CERR,aditiiyer/CERR,aditiiyer/CERR,aditiiyer/CERR,cerr/CERR,cerr/CERR