vtkSmartPointer<vtkImageMapToWindowLevelColors> mFusionMapper;
vtkSmartPointer<vtkImageActor> mFusionActor;
vtkSmartPointer<vtkCornerAnnotation> ca;
vtkSmartPointer<vtkImageMapToWindowLevelColors> mFusionMapper;
vtkSmartPointer<vtkImageActor> mFusionActor;
vtkSmartPointer<vtkCornerAnnotation> ca;