# Extracting a subnetwork from 3D volume

**URL:** <https://discourse.slicer.org/t/extracting-a-subnetwork-from-3d-volume/11570>\
**Category:** Support\
**Created:** [May 16, 2020, 3:21am UTC](https://discourse.slicer.org/t/extracting-a-subnetwork-from-3d-volume/11570 "2020-05-16T03:21:12Z")\
**Posts on this page:** 1\
**Showing post:** 4

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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:** [May 16, 2020, 5:18am UTC](https://discourse.slicer.org/t/extracting-a-subnetwork-from-3d-volume/11570/4 "2020-05-16T05:18:12Z")

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You mean like this? If so, please follow the @lassoan’s instructions above (Basically segment larger diameter ones as a separate segment (red), then subtract it from the original segment (green)

![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/9/a/9af54e03e70d1174fba768e96d8e230986a2aebe.jpeg)

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_[View the full topic](https://discourse.slicer.org/t/extracting-a-subnetwork-from-3d-volume/11570)._