# Level tracing segmentation

**URL:** <https://discourse.slicer.org/t/level-tracing-segmentation/14490>\
**Category:** Support\
**Tags:** segmentation\
**Created:** [November 8, 2020, 2:44pm UTC](https://discourse.slicer.org/t/level-tracing-segmentation/14490 "2020-11-08T14:44:21Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![sahithi](https://avatars.discourse-cdn.com/v4/letter/s/90ced4/32.png) [@sahithi](https://discourse.slicer.org/u/sahithi)\
**Post date:** [November 8, 2020, 2:44pm UTC](https://discourse.slicer.org/t/level-tracing-segmentation/14490/1 "2020-11-08T14:44:22Z")

</div>

Hello everyone,

I have a doubt regarding level tracing segmentation. Is level tracing segmentaion kind of thresholding segmentation(semi automatic) or not?

If it is diffrent from thresholding, can somebody please tell me what is the working principle of level tracing segmentation. I have already gone through the slicer documentation of level tracing segmentation.

I would really appreaciate, if somebody can share relevant papers on this topic.

Looking forward for the response.

Thank you,

Best Regards  
Sahithi

---

<div class="post-metadata">

**Author:** ![pieper](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/pieper/32/8_2.png) [@pieper](https://discourse.slicer.org/u/pieper)\
**Post date:** [November 8, 2020, 3:20pm UTC](https://discourse.slicer.org/t/level-tracing-segmentation/14490/2 "2020-11-08T15:20:26Z")

</div>

I’m not sure there’s any paper about LevelTracing. It’s a simple concept: think of the image as an elevation map (like a mountain range) and the LevelTracing lines are like iso-contours of constant elevation. E.g. like standing on the side of a hill and walking around the hill without going up or down until you end up back where you started.