# Segmentation error

**URL:** <https://discourse.slicer.org/t/segmentation-error/1579>\
**Category:** Support\
**Created:** [December 2, 2017, 10:51pm UTC](https://discourse.slicer.org/t/segmentation-error/1579 "2017-12-02T22:51:49Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Hamburgerfinger](https://avatars.discourse-cdn.com/v4/letter/h/eb9ed0/32.png) [@Hamburgerfinger](https://discourse.slicer.org/u/Hamburgerfinger)\
**Post date:** [December 2, 2017, 10:51pm UTC](https://discourse.slicer.org/t/segmentation-error/1579/1 "2017-12-02T22:51:49Z")

</div>

Hi!

I have an error in segmentation that’s recurrent… Sometimes when drawing or painting a segment in a given slice, a portion of the segment is applied onto the adjacent slices – please see pictures (circular segment was applied in first image only, but diagonal line is missing, which appears in the adjacent slice).

 ![02 PM](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/0/c/0c37c208f6770e62ffa3f005cd511d70173251d7.jpeg)

If I observe this in any of the slices I’ve defined segments with, “Fill between slices” doesn’t work properly then either.

Why is this and how can I prevent it from happening?

Thanks!  
Luke

---

<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:** [December 3, 2017, 12:02am UTC](https://discourse.slicer.org/t/segmentation-error/1579/2 "2017-12-03T00:02:45Z")

</div>

This happens when you paint on oblique slices: you either you’ve changed the slice orientation (not likely) or your image was acquired with tilted axes. See this post for instructions how to edit such images: [Segmentation Editor - How to disable painting on adjacent slices?](https://discourse.slicer.org/t/segmentation-editor-how-to-disable-painting-on-adjacent-slices/1459/4)