# Subrachnoid space segmentation

**URL:** <https://discourse.slicer.org/t/subrachnoid-space-segmentation/14626>\
**Category:** Support\
**Created:** [November 16, 2020, 4:35am UTC](https://discourse.slicer.org/t/subrachnoid-space-segmentation/14626 "2020-11-16T04:35:33Z")\
**Posts on this page:** 1\
**Showing post:** 2

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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, 7:16am UTC](https://discourse.slicer.org/t/subrachnoid-space-segmentation/14626/2 "2020-11-16T07:16:18Z")

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There are many tools that can help, but the first I would recommend to try is [Local thresholding](https://discourse.slicer.org/t/new-segment-editor-effect-local-threshold/9233) (provided by SegmentEditorExtraEffects extension). You can set a threshold range (optionally an additional region of interest), and then segment a structure by a single click (Ctrl+Left-click).

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