    reader = vtkXMLImageDataReader()
    reader.SetFileName(filename)
    reader.Update()

    # Convert the image to a polydata
    imageDataGeometryFilter = vtkImageDataGeometryFilter()
--
    reader = vtkXMLImageDataReader()
    reader.SetFileName(file_name)

    # Create the mapper that creates graphics elements
    mapper = vtkDataSetMapper()
    mapper.SetInputConnection(reader.GetOutputPort())
