Hi everyone, I’m trying to use Maurer 3D distance map to calculate the difference in size of a tumor before and after procedure (to estimate margin). I applied the signedmaurerdistancemap filter to the pre-procedure tumor, but how do I superimpose the post-procedure tumor onto this map and pull out the difference in distance of the tumor before and after procedure? Thank you

I think the issue is not the segmentation node but the segment, because otherwise the error message would be “AttributeError: ‘NoneType’ object has no attribute ‘GetSegmentation’”. But in any case, any string literals in sample code should be double checked for your use case, because every Slicer scene is different. You can get the segment IDs like this: segmentIds = vtk.vtkStringArray() segNode.GetSegmentation().GetSegmentIDs(segmentIds) for i in xrange(segmentIds.GetNumberOfValues()): print segmentIds.GetValue(i)

[image] ytaneja: What are the units that you have in the histogram? 1100 (pixels, mm, microns?) difference in the models It is a histogram. Y axis is count, which is the number of model points in that distance bin.

Calculating distance using Maurer distance map

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lassoan (Andras Lasso) September 18, 2019, 10:33pm 21

It is a histogram. Y axis is count, which is the number of model points in that distance bin.

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Calculating distance using Maurer distance map

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