+//
+//===> Many users expect from vtkGdcmReader it 'orders' the images
+// (that's the job of gdcm::SerieHelper ...)
+// When user *knows* the files with same Serie UID
+// have same sizes, same 'pixel' type, same color convention, ...
+// the right way to proceed is as follow :
+//
+// gdcm::SerieHelper *sh= new gdcm::SerieHelper();
+// // if user wants *not* to load some parts of the file headers
+// sh->SetLoadMode(loadMode);
+// // if user wants *not* to load some files
+// sh->AddRestriction(group, element, value, operator);
+// sh->AddRestriction( ...
+// sh->SetDirectory(directoryWithImages);
+//
+// // if user wants to sort reverse order
+// sh->SetSortOrderToReverse();
+// // here, we suppose only the first Coherent File List is of interest
+// gdcm::FileList *l = sh->GetFirstCoherentFileList();
+// // if user is doesn't trust too much the files with same Serie UID
+// if ( !sh->IsCoherent(l) )
+// return; // not same sizes, same 'pixel' type -> stop
+// sh->OrderFileList(l); // sort the list
+//
+// vtkGdcmReader *reader = vtkGdcmReader::New();
+// // if user wants to modify pixel order (Mirror, TopDown, 90°Rotate, ...)
+// // he has to supply the function that does the job
+// // (a *very* simple example is given in vtkgdcmSerieViewer.cxx)
+// reader->SetUserFunction (userSuppliedFunction);
+// // to pass a 'Coherent File List' as produced by gdcm::SerieHelper
+// reader->SetCoherentFileList(l);
+// reader->Update();
+