# Export heart motion to CFD/FSI

**URL:** <https://discourse.slicer.org/t/export-heart-motion-to-cfd-fsi/22913>\
**Category:** Support\
**Tags:** registration, fem\
**Created:** [April 11, 2022, 6:54pm UTC](https://discourse.slicer.org/t/export-heart-motion-to-cfd-fsi/22913 "2022-04-11T18:54:07Z")\
**Posts on this page:** 1\
**Showing post:** 20

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**Author:** ![Gening\_Dong](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/gening_dong/32/14706_2.png) [@Gening\_Dong](https://discourse.slicer.org/u/Gening_Dong)\
**Post date:** [April 21, 2022, 2:34pm UTC](https://discourse.slicer.org/t/export-heart-motion-to-cfd-fsi/22913/20 "2022-04-21T14:34:02Z")

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Hi @lassoan , thanks for your help with the position extracting. However I met another problem right now: I want to calculate strain tensor of the boundary. I read your suggestion [here](https://discourse.slicer.org/t/4d-cardiac-ct-strain-analysis/22789/3) so I’m trying to export the displacement field.

I found an example for extracting displacement field [here](https://slicer.readthedocs.io/en/latest/developer_guide/script_repository.html#export-the-displacement-magnitude-of-the-transform-as-a-volume). However, I only want the displacement field in the segmentation/model, but not the entire volume. Can I transfer a segmentation into a new volume so that I can export the displacement magnitude of the transform as a volume and visualize it? Or do you have any other ideas to get the displacement field of a model?

Thanks a lot!

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