# Are all bones modelled in 3D Slicer hollow? I need to use them for FEA.

**URL:** <https://discourse.slicer.org/t/are-all-bones-modelled-in-3d-slicer-hollow-i-need-to-use-them-for-fea/31865>\
**Category:** Support\
**Tags:** segmentation, dicom, 3d-model, femur, fem\
**Created:** [September 24, 2023, 2:51am UTC](https://discourse.slicer.org/t/are-all-bones-modelled-in-3d-slicer-hollow-i-need-to-use-them-for-fea/31865 "2023-09-24T02:51:03Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![manjula](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/manjula/32/80981_2.png) [@manjula](https://discourse.slicer.org/u/manjula)\
**Post date:** [September 24, 2023, 11:09am UTC](https://discourse.slicer.org/t/are-all-bones-modelled-in-3d-slicer-hollow-i-need-to-use-them-for-fea/31865/4 "2023-09-24T11:09:56Z")

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i thinkn answer is in here

> [@Create a 3D solid model from CT scans](https://discourse.slicer.org/t/create-a-3d-solid-model-from-ct-scans/18562/4):
>
> “Don’t mesh it” is not an option. “Solid geometry” concept only exists in CAD software - it refers to parametric representation of a shape, obtained from combining simple parametric primitives and can be characterized with a few hundred or maybe a few thousand parameters. In contrast, in medical image computing you generate shapes from images, which consists of tens or hundreds of millions of voxels, so the resulting object cannot be practically stored with a parametric representation (you would…

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