# Elastic Registration

**URL:** <https://discourse.slicer.org/t/elastic-registration/46025>\
**Category:** Support\
**Tags:** registration, segmentation, dicom, python\
**Created:** [February 1, 2026, 6:38pm UTC](https://discourse.slicer.org/t/elastic-registration/46025 "2026-02-01T18:38:00Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Zah](https://avatars.discourse-cdn.com/v4/letter/z/57b2e6/32.png) [@Zah](https://discourse.slicer.org/u/Zah)\
**Post date:** [February 1, 2026, 6:38pm UTC](https://discourse.slicer.org/t/elastic-registration/46025/1 "2026-02-01T18:38:00Z")

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**Hi 3D Slicer Community,**

I’m new to 3D Slicer and still learning, and I have a few questions.

1. **After performing an elastic registration, should I harden the transformed CBCT using the “Transforms” module, or should this be done from the “Data” module?**

2. **When I save my data and reopen the scene, I don’t get the same results.**  
Is there a recommended or specific way to save all transformed volumes and segmentations to ensure everything loads correctly?

3. **After applying an elastic transformation, how can I extract the deformation matrix or deformation field?**  
I would like to quantify the deformation if possible.

4. **Finally, is there any method other than “Segment Cross-Section Area” to compare bone gain before and after grafting?**  
I’m looking for reliable ways to quantify volumetric changes.

Thank you very much for your help.

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**Author:** ![muratmaga](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/muratmaga/32/3622_2.png) [@muratmaga](https://discourse.slicer.org/u/muratmaga)\
**Post date:** [February 1, 2026, 7:12pm UTC](https://discourse.slicer.org/t/elastic-registration/46025/2 "2026-02-01T19:12:58Z")

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> [@Zah](#):
>
> **After performing an elastic registration, should I harden the transformed CBCT using the “Transforms” module, or should this be done from the “Data” module?**

These are equivalent, doesn’t matter where you it.

> [@Zah](#):
>
> **When I save my data and reopen the scene, I don’t get the same results.**

That shouldn’t be the case. Are you sure you are saving all the objects associated with the scene?

> [@Zah](#):
>
> **After applying an elastic transformation, how can I extract the deformation matrix or deformation field?**

Deformation field will be saved as a transform. You can then turn that into a grid transform or displacement field, depending on how you want to quantify the deformation. There are no specific tools to quantify deformation in Slicer, as far as I know.

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**Author:** ![Zah](https://avatars.discourse-cdn.com/v4/letter/z/57b2e6/32.png) [@Zah](https://discourse.slicer.org/u/Zah)\
**Post date:** [February 22, 2026, 11:19am UTC](https://discourse.slicer.org/t/elastic-registration/46025/3 "2026-02-22T11:19:06Z")

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thank you very much for your response, I tried another rigid way for registration and it worked. I would like to know if you are still having weekly meetings? if this is the case, I would appreciate it to join to share my findings