I know 3D slicer can merge two volume/slice nodes from separate CT data but is it possible to merge an PLY/STL loaded model node with a CT volume/slice node?

I’ve already implemented this in Curved Planar Reformat module. It can now create a transform that you can use to transform implants, landmark points, models, etc. between the original and straightened volume.

Not quite what I was referring to. For example, we obtain 2 nodes as such ply_node = slicer.util.getNode(‘model_name’) ct_node = slicer.util.getNode(‘ct_name’) merged_node = merge(ply_node, ct_node) such that merged_node contains the image/volume data from both nodes

How do you envision combining models and volumes? Would you like to end up with a model or a volume? You can import a model into a segmentation and then use Segment Editor’s Mask volume effect (provided by SegmentEditorExtraEffects extension) to paste the segment into the volume.

hey, i found have this from the nightly script repository meshVolumeNode = getNode(mesh_model) seg = slicer.mrmlScene.AddNewNodeByClass(‘vtkMRMLSegmentationNode’) slicer.modules.segmentations.logic().ImportModelToSegmentationNode(meshVolumeNode, seg) seg.CreateClosedSurfaceRepresentation() sli…

[image] talmazov: I’m working on an extension that builds around panoramic reconstruction which essentially straightens a volume: Slice rotation in viewport when using SetSliceToRASByNTP in python but i also want this reconstruction to incorporate mesh models so im trying to merge volumes - im …

Woa this is really neat! I didn’t realize this feature had been implemented. Ultimately I’m trying to do implant planning so having the an stl/ply mesh representation of the implant shown in the pan tomographic representation would be really useful. Can I merge segmentation with ct node in order to…

You can “paint” an STL model into a CT by importing the STL model into a segmentation then use Mask volume effect (provided by SegmentEditorExtraEffects extension) in Segment Editor module. Model painted into CBCT volume using Mask volume effect: [image]

The Mask Volume works beautifully with the CPR extension. One caveat I have though is that when I use mask volume, the segment color turns gray once projected onto the CT volume. so when I use the CPR extension to transform the gray color of the segment blends against the gray values of the CT volum…

[image] talmazov: when I use the CPR extension to transform the gray color of the segment blends against the gray values of the CT volume. any workaround for that? In mask volume effect, you can pick the gray color intensity. Probably you want to set a high value to indicate that the implant…

hey, i saw on the nightly script repository an example on how to access scripted modules. I want to access the mask volume effect, i am trying this slicer.modules.segmenteditoreffect.widgetRepresentation().maskVolumeWithSegment() but i get that module ‘modules’ has no attribute ‘segmenteditoreffe…

Merge CT volume node with a model node in python

Development

pieper (Steve Pieper (Isomics, Inc.)) December 10, 2019, 2:12pm 2

Yes, you can load PLY/STL models and display them with the CT. But because those formats don’t define a reference space they may not align. See this post for example.

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Merge CT volume node with a model node in python

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