vtkLookupTable* LUT = static_cast<vtkLookupTable*>(this->GetWindowLevel()->GetLookupTable());
if ( LUT ) {
double window = this->GetWindowLevel()->GetWindow();
vtkLookupTable* LUT = static_cast<vtkLookupTable*>(this->GetWindowLevel()->GetLookupTable());
if ( LUT ) {
double window = this->GetWindowLevel()->GetWindow();