Is there a way to getCurrentVolumeNode?

Dear all,
I’ve been using Slicer for a time now and am really happy with it.
However, there is one thing I have not found out.

When I’m using a script right now, I manually change the volumeNode name to a certain name.
I always only load one volumenode, never two scans at a time.

My code then uses

masterVolumeNode = getNode('name')

to get the volumeNode by name.

However, is there a way to let slicer get the currently loaded node? Independent of the name? (by selecting the only available volume node in the hierarchy?)
Something like

masterVolumeNode = getActiveNode()

In example scripts I always see examples that manually get volumeNode by name, so I wonder whether it is available at all.

Thanks a lot in advance!
Best,
Justin

If you have only a single volume loaded then you can use slicer.mrmlScene.GetFirstNodeByClass('vtkMRMLScalarVolumeNode').

If you work with multiple nodes (which is most of the time) then you add node selectors to your module GUI to let the user choose inputs and outputs.

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Thanks, that’s indeed the solution to my problem!

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