# Segmentation edges

**URL:** <https://discourse.slicer.org/t/segmentation-edges/15837>\
**Category:** Support\
**Tags:** segmentation, dicom\
**Created:** [February 4, 2021, 1:24pm UTC](https://discourse.slicer.org/t/segmentation-edges/15837 "2021-02-04T13:24:46Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Giulia1](https://avatars.discourse-cdn.com/v4/letter/g/bbce88/32.png) [@Giulia1](https://discourse.slicer.org/u/Giulia1)\
**Post date:** [February 4, 2021, 1:24pm UTC](https://discourse.slicer.org/t/segmentation-edges/15837/1 "2021-02-04T13:24:46Z")

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Hi! I have a problem during knee segmentation, as the segments are not created with a linear and defined line on the edges (image below). I would like to understand if there is a way to get the outline obtained from the segments equal to the one in the image above.

Thanks!!

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/6/b/6bbf6642b635f3868d091bdd8911d7f5fe763372.jpeg)

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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:** [February 4, 2021, 2:00pm UTC](https://discourse.slicer.org/t/segmentation-edges/15837/2 "2021-02-04T14:00:44Z")

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The input volume is highly anisotropic and by default Slicer uses the same resolution for the segmentation as the input volume. See instruction on how to refine the segmentation [here](https://slicer.readthedocs.io/en/latest/user_guide/modules/segmenteditor.html#segmentation-is-not-accurate-enough).