# MultiLevelRegistration

**URL:** <https://discourse.slicer.org/t/multilevelregistration/1478>\
**Category:** Support\
**Created:** [November 17, 2017, 2:52am UTC](https://discourse.slicer.org/t/multilevelregistration/1478 "2017-11-17T02:52:59Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Marta\_Pais](https://avatars.discourse-cdn.com/v4/letter/m/c77e96/32.png) [@Marta\_Pais](https://discourse.slicer.org/u/Marta_Pais)\
**Post date:** [November 17, 2017, 2:52am UTC](https://discourse.slicer.org/t/multilevelregistration/1478/1 "2017-11-17T02:52:59Z")

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Hi all,

I need to get Jaccard coefient between some structure sets and the only way i found out, using slicer, is using the MultiLevelRegistration extension, but i can’t seem to find it on the Extension Manager.

I event tried to build slicer from source and then build the extension but i couldn’t get it going.

any help would be welcome.

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<div class="post-metadata">

**Author:** ![gcsharp](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/gcsharp/32/863_2.png) [@gcsharp](https://discourse.slicer.org/u/gcsharp)\
**Post date:** [November 17, 2017, 1:56pm UTC](https://discourse.slicer.org/t/multilevelregistration/1478/2 "2017-11-17T13:56:35Z")

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Hi Marta,

The SlicerRT extension has a “Segment Comparison” tool. Although this does not give Jaccard at this time, it does display True/False Positive/Negative fractions. Jaccard can be computed from these.

Greg