# Estimate percentage of cystic component

**URL:** <https://discourse.slicer.org/t/estimate-percentage-of-cystic-component/17973>\
**Category:** Support\
**Created:** [June 6, 2021, 12:30pm UTC](https://discourse.slicer.org/t/estimate-percentage-of-cystic-component/17973 "2021-06-06T12:30:15Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Gabriel1](https://avatars.discourse-cdn.com/v4/letter/g/0ea827/32.png) [@Gabriel1](https://discourse.slicer.org/u/Gabriel1)\
**Post date:** [June 6, 2021, 12:30pm UTC](https://discourse.slicer.org/t/estimate-percentage-of-cystic-component/17973/1 "2021-06-06T12:30:15Z")

</div>

Hello,

I would like to estimate the cystic composant of a tumor. Maybe using a percentage of voxel with high value (near water)?  
I didn’t find anything like this in segment statistics.  
Does anyone have an idea?

Thanks 🙂

---

<div class="post-metadata">

**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:** [June 6, 2021, 7:02pm UTC](https://discourse.slicer.org/t/estimate-percentage-of-cystic-component/17973/2 "2021-06-06T19:02:11Z")

</div>

You can segment each component separately in Segment Editor (you can use Threshold effect with appropriate masking settings to split a part of a segment in a specific intensity range - see Masking section at the bottom). Then, you can get the volumes using Segment Statistics module.

I thing the neurosurgery planning tutorial explains this. It may even use a better tool for this - Grow from seeds - that segments all the different regions in one step, from a few scribbles.