imagebase->GetWholeExtent(ext);
dimBase[0]=ext[1]-ext[0]+1;
dimBase[1]=ext[3]-ext[2]+1;
dimBase[2]=ext[5]-ext[4]+1;
SetDimensionBase(dimBase);
imagebase->GetWholeExtent(ext);
dimBase[0]=ext[1]-ext[0]+1;
dimBase[1]=ext[3]-ext[2]+1;
dimBase[2]=ext[5]-ext[4]+1;
SetDimensionBase(dimBase);