# Can't find segmentcomparison in SlicerRT in the 3d slicer 5.6.2

**URL:** <https://discourse.slicer.org/t/cant-find-segmentcomparison-in-slicerrt-in-the-3d-slicer-5-6-2/38379>\
**Category:** Support\
**Created:** [September 14, 2024, 3:31pm UTC](https://discourse.slicer.org/t/cant-find-segmentcomparison-in-slicerrt-in-the-3d-slicer-5-6-2/38379 "2024-09-14T15:31:09Z")\
**Posts on this page:** 8\
**Page:** 1

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**Author:** ![Alice914](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/alice914/32/77819_2.png) [@Alice914](https://discourse.slicer.org/u/Alice914)\
**Post date:** [September 14, 2024, 3:31pm UTC](https://discourse.slicer.org/t/cant-find-segmentcomparison-in-slicerrt-in-the-3d-slicer-5-6-2/38379/1 "2024-09-14T15:31:10Z")

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Hi!  
My 3d slicer version is 5.6.2 in Ubuntu24.04 and Windows11. I try to find Segment Comparison in two systems, but I can’t find it in the module. Could you taught me how to calculate **Hausdorff Distance** 、 **Mean Distance** or **Dice Similarity Coefficient** in 3d slicer? Thank you for your help.

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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:** [September 14, 2024, 3:32pm UTC](https://discourse.slicer.org/t/cant-find-segmentcomparison-in-slicerrt-in-the-3d-slicer-5-6-2/38379/2 "2024-09-14T15:32:22Z")

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After you install 3D Slicer, please install SlicerRT extension in the Extensions Manager. Segment Comparison module will show up then in the module list:

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/5/3/531843722f01fe25c1223325097d817a36719630.png)

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**Author:** ![Alice914](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/alice914/32/77819_2.png) [@Alice914](https://discourse.slicer.org/u/Alice914)\
**Post date:** [September 18, 2024, 9:08am UTC](https://discourse.slicer.org/t/cant-find-segmentcomparison-in-slicerrt-in-the-3d-slicer-5-6-2/38379/3 "2024-09-18T09:08:49Z")

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Thank you for your teaching. Great. I found extension in the module, but I couldn’t find SlicerRT. 3d slicer in Ubuntu couldn’t normally download. So I downloaded slicrrt in the slicerrt website and SegmentComparison packege of SlicerRT from Github. And then segmentcomparison path added by additional module path of modules in additional settings. After these steps, Windows11 show SegmentComparison in the module. But Ubuntu24.04 doesn’t have.

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/0/3/034f7a0ee07bc889ed20465225b425c9be4f95ff.jpeg)  
 ![img_v3_02er_8c3e1e38-45a3-4917-8b73-be7cb1ee162g](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/9/8/985e784947f863d6e0d02215fffe19431fa8e62b.jpeg)  
 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/5/6/560a3c1b6fdf2f595296ac601fb0190a7a914e68.jpeg)

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**Author:** ![cpinter](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/cpinter/32/7995_2.png) [@cpinter](https://discourse.slicer.org/u/cpinter)\
**Post date:** [September 18, 2024, 10:49am UTC](https://discourse.slicer.org/t/cant-find-segmentcomparison-in-slicerrt-in-the-3d-slicer-5-6-2/38379/4 "2024-09-18T10:49:22Z")

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Your approach does not work with modules that have any C++ component. You will either need to build Slicer and SlicerRT from source code, or make sure the Extensions Manager can download the extension.

Do you have download problems only for SlicerRT or all the extensions? Are you behind a firewall (such as in hospital environment)? If so, then maybe that’s why. In that case you can download SlicerRT for 5.6.2 Ubuntu here:  
[https://slicer.cdash.org/build/3527219/files](https://slicer.cdash.org/build/3527219/files)  
You can install it using the “Install from file” button in the Extensions manager.

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**Author:** ![Alice914](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/alice914/32/77819_2.png) [@Alice914](https://discourse.slicer.org/u/Alice914)\
**Post date:** [September 20, 2024, 9:25am UTC](https://discourse.slicer.org/t/cant-find-segmentcomparison-in-slicerrt-in-the-3d-slicer-5-6-2/38379/5 "2024-09-20T09:25:48Z")

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I am sorry. May you explain what is C++ component? Now I download SlicerRT from slicerrt website and install it in the Slicer.

 ![img_v3_02er_144ec033-d9c6-4ab7-81a8-7184af5e52fg](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/7/7/777d705da6f4d85dce45b91b62138f52f51647d3.jpeg)  
And then I add segmentcomparison package from github in slicerrt. But I didn’t see segmentcomparison in the module.  
 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/5/2/5280bfbb0224be3d8ffaadf645313330fe9b85df.jpeg)  
How can I do? please teach me! Thanks

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<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:** [September 20, 2024, 4:29pm UTC](https://discourse.slicer.org/t/cant-find-segmentcomparison-in-slicerrt-in-the-3d-slicer-5-6-2/38379/6 "2024-09-20T16:29:58Z")

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Probably your organization interferes with your internet access (they use Zscaler or similar heuristic software that often breaks legitimate web applications).

Fortunately, there are alternative ways of downloading and installing Slicer extensions - see instructions [here](https://slicer.readthedocs.io/en/latest/user_guide/extensions_manager.html#install-extensions-without-network-connection).

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<div class="post-metadata">

**Author:** ![cpinter](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/cpinter/32/7995_2.png) [@cpinter](https://discourse.slicer.org/u/cpinter)\
**Post date:** [September 23, 2024, 8:24am UTC](https://discourse.slicer.org/t/cant-find-segmentcomparison-in-slicerrt-in-the-3d-slicer-5-6-2/38379/7 "2024-09-23T08:24:34Z")

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I sent an actual download link above. @Alice914 you can use that to download the zip.

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**Author:** ![Alice914](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/alice914/32/77819_2.png) [@Alice914](https://discourse.slicer.org/u/Alice914)\
**Post date:** [September 23, 2024, 9:22am UTC](https://discourse.slicer.org/t/cant-find-segmentcomparison-in-slicerrt-in-the-3d-slicer-5-6-2/38379/8 "2024-09-23T09:22:52Z")

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Thank you a lot. It is internet problem.