# From the hollow back to the lumen

**URL:** <https://discourse.slicer.org/t/from-the-hollow-back-to-the-lumen/14648>\
**Category:** Support\
**Created:** [November 16, 2020, 10:02pm UTC](https://discourse.slicer.org/t/from-the-hollow-back-to-the-lumen/14648 "2020-11-16T22:02:08Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Andreas](https://avatars.discourse-cdn.com/v4/letter/a/ee7513/32.png) [@Andreas](https://discourse.slicer.org/u/Andreas)\
**Post date:** [November 16, 2020, 10:02pm UTC](https://discourse.slicer.org/t/from-the-hollow-back-to-the-lumen/14648/1 "2020-11-16T22:02:08Z")

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Hello everyone,

I have a completely segmented vessel model and wanted to ask whether I can remove the vessel walls again in order to only see the lumen?

So I could measure the internal dimensions of the segmented vessel exactly and calculate the volume.

Sincerely yours

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [November 16, 2020, 11:21pm UTC](https://discourse.slicer.org/t/from-the-hollow-back-to-the-lumen/14648/2 "2020-11-16T23:21:23Z")

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You can use any of the fill methods (grow from seeds, flood fill, etc.) to fill the volume within the vessel wall.