[vtkusers] help with vtkmarchingsquares

[car01a]

hi I'm beginner I want to visualize the contours of animage but Icant Im
using vtkmarchingsquares I tried with vtkimageviewer but its wrong please
help me  
a little of my code where I have problems
I read my image using vtk cause I need to work with dicom

ITKExportType::Pointer itkVTKExporter= ITKExportType::New();

      vtkImageImport *vtkImporter = vtkImageImport::New();

      itkVTKExporter->SetInput(reader->GetOutput());

     ConnectPipelines(itkVTKExporter, vtkImporter);
       vtkImporter->Update();
 
 

//////////////////////////////////////////////// 


vtkImageViewer2     *viewer = vtkImageViewer2::New();


	vtkRenderWindowInteractor* renderWindowInteractor=
		vtkRenderWindowInteractor::New();





vtkSmartPointer<vtkMarchingSquares> contour =
vtkSmartPointer<vtkMarchingSquares>::New();


contour->SetInput(vtkImporter->GetOutput());

contour->GenerateValues(1, .5, .5);	



 

	viewer->SetupInteractor( renderWindowInteractor);
	viewer->SetInput(contour->GetOutput() );        
   viewer->SetSlice(60);

	viewer->Render();
	viewer->SetColorWindow( 255);
	viewer->SetColorLevel( 128);


	renderWindowInteractor->Initialize();
	renderWindowInteractor->Start();




this part is wrong viewer->SetInput(contour->GetOutput() );  why what I have
to put instead??
 can not convert parameter 1 from 'vtkPolyData *' to 'vtkImageData *'


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