vtkimagegaussiansmooth->SetStandardDeviation( stdvX,stdvY, stdvZ );
vtkimagegaussiansmooth->Modified();
vtkimagegaussiansmooth->Update();
vtkimagegaussiansmooth->SetStandardDeviation( stdvX,stdvY, stdvZ );
vtkimagegaussiansmooth->Modified();
vtkimagegaussiansmooth->Update();