About vtkImagePlaneWidget remove or delete vtkImageData from it self.

Development
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Now, I created a vtkImagePlaneWidget instance, and i set the vtkImageData by SetInputDataConnection().
Now, I want to set another vtkImageData instance, But I don’t konw how to remove the first vtkImageData instance or disconnect the pipeline between vtkImagePlaneWidget and vtkImageData. Please give me some suggestion.