# Can I get a specific vertex number surface model from lung CT and its segmentation？

**URL:** <https://discourse.slicer.org/t/can-i-get-a-specific-vertex-number-surface-model-from-lung-ct-and-its-segmentation/23795>\
**Category:** Support\
**Tags:** 3d-model\
**Created:** [June 9, 2022, 1:36pm UTC](https://discourse.slicer.org/t/can-i-get-a-specific-vertex-number-surface-model-from-lung-ct-and-its-segmentation/23795 "2022-06-09T13:36:30Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![qod\_rec](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/qod_rec/32/15572_2.png) [@qod\_rec](https://discourse.slicer.org/u/qod_rec)\
**Post date:** [June 9, 2022, 1:36pm UTC](https://discourse.slicer.org/t/can-i-get-a-specific-vertex-number-surface-model-from-lung-ct-and-its-segmentation/23795/1 "2022-06-09T13:36:30Z")

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Hello，I’m trying to do some deep learning quest on 3d reconstruction from lung x-rays (CT’s DRR). I want to take some features from DRR and use this to transform a initial template lung mesh to the ground-truth mesh, which needs a specific vertex number mesh model and a relation between the vertex and the DRR.  
Here are my questions about data preparation:

1. Can I get a specific vertex number surface model from a lung CT and its segmentation?(Now I can only export a surface model to STL or OBJ which has a random vertex number).
2. I know that DRR is a synthetic x-ray for a CT. Can I get a DRR in slicer?
3. If I get a DRR and the specific vertex number surface model, is there any way I can map the vertex of the model onto a DRR pixel?
4. For the initial lung template mesh, can I get a mean shape mesh from different lung CTs?

Sorry for my stupid questions, I’m really poor in medical knowledge.