change->SetExtentTranslation( -ext[0], -ext[2], -ext[4] );
change->SetOutputSpacing ( voxelSize , voxelSize , voxelSize );
change->Update(); //important
change->SetExtentTranslation( -ext[0], -ext[2], -ext[4] );
change->SetOutputSpacing ( voxelSize , voxelSize , voxelSize );
change->Update(); //important