# Boundary deviation (BD) and Dice Similarity Coefficient (DSC)

**URL:** <https://discourse.slicer.org/t/boundary-deviation-bd-and-dice-similarity-coefficient-dsc/8101>\
**Category:** Support\
**Created:** [August 20, 2019, 1:44am UTC](https://discourse.slicer.org/t/boundary-deviation-bd-and-dice-similarity-coefficient-dsc/8101 "2019-08-20T01:44:31Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![MFS-YES](https://avatars.discourse-cdn.com/v4/letter/m/bbe5ce/32.png) [@MFS-YES](https://discourse.slicer.org/u/MFS-YES)\
**Post date:** [August 20, 2019, 1:44am UTC](https://discourse.slicer.org/t/boundary-deviation-bd-and-dice-similarity-coefficient-dsc/8101/1 "2019-08-20T01:44:31Z")

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Operating system:  
Slicer version: Hello!

I want to calculate **Boundary deviations or differences (BD)** and **Dice Similarity Coefficient (DSC)** for a 3D image on slicer and show error map (from 0 to 1). I evaluate BD by using superimposition method and display error map, am I on a good way? But I don’t know the way or module to calculate DSC via slicer. Need help. Thanks!  
Expected behavior:  
Actual behavior:

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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:** [August 21, 2019, 4:29pm UTC](https://discourse.slicer.org/t/boundary-deviation-bd-and-dice-similarity-coefficient-dsc/8101/2 "2019-08-21T16:29:22Z")

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You can get Hausdorff distance and Dice similarity coefficient using “Segment Comparison” module (in SlicerRT extension). You can compute an error map by exporting segments to models and computing distances using “Model to model distance” extension.

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**Author:** ![MFS-YES](https://avatars.discourse-cdn.com/v4/letter/m/bbe5ce/32.png) [@MFS-YES](https://discourse.slicer.org/u/MFS-YES)\
**Post date:** [August 21, 2019, 7:12pm UTC](https://discourse.slicer.org/t/boundary-deviation-bd-and-dice-similarity-coefficient-dsc/8101/3 "2019-08-21T19:12:15Z")

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thanks!

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**Author:** ![Young\_Wang](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/young_wang/32/13926_2.png) [@Young\_Wang](https://discourse.slicer.org/u/Young_Wang)\
**Post date:** [December 13, 2023, 9:51pm UTC](https://discourse.slicer.org/t/boundary-deviation-bd-and-dice-similarity-coefficient-dsc/8101/4 "2023-12-13T21:51:56Z")

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> [@lassoan](#):
>
> SlicerRT

Hi @lassoan, I’m using Slicer 5.6 and I have trouble of locating Hausdorff distance and Dice similarity coefficient and “Segment Comparison” module. I have installed (in SlicerRT extension. Could you please point me to where this module is? Thanks.