Avoid creating multiple module widget instances from a python script

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1

Hi,
I am trying to generate centerlines for a batch of segmentation masks. I use a python script that uses the VMTK Extract Centerline widget. The issue is that for every new segmentation, Slicer opens a new Extract Centerline widget window, while keeping the previous window open as well, leading to a lot of windows, as the script processes more masks. The script has the following structure.

for volume, segmentation in zip(volume_list, segmentation_list):
# 1. load volume and segmentation
...

# 2. Auto-detect the endpoints and extract centerline
extractCenterlineWidget = ExtractCenterline.ExtractCenterlineWidget()
# Set the parameters
extractCenterlineWidget._parameterNode.SetNodeReferenceID("InputSurface", seg.GetID())
extractCenterlineWidget._parameterNode.SetParameter("InputSegmentID", segmentID)
...
extractCenterlineWidget.onAutoDetectEndPoints()
extractCenterlineWidget.onApplyButton()

# Save centerline
...

# Clean up
slicer.mrmlScene.Clear(0)

# Hoping this would exit slicer completely and start 
# again for the next iteration of the loop but it does not.
slicer.app.exit()

How to avoid opening multiple widget windows or close the previous one when the processing for the current segmentation is finished?

2

The simplest solution is to re-use the same widget and only change the parameter node content before calling apply again.

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