# Slicer-RT Contour Analysis 

**URL:** <https://discourse.slicer.org/t/slicer-rt-contour-analysis/18563>\
**Category:** Support\
**Tags:** extensions-manager\
**Created:** [July 7, 2021, 12:30pm UTC](https://discourse.slicer.org/t/slicer-rt-contour-analysis/18563 "2021-07-07T12:30:39Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![liam-stubbington](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/liam-stubbington/32/11513_2.png) [@liam-stubbington](https://discourse.slicer.org/u/liam-stubbington)\
**Post date:** [July 7, 2021, 12:30pm UTC](https://discourse.slicer.org/t/slicer-rt-contour-analysis/18563/1 "2021-07-07T12:30:39Z")

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Hi,

Massive fun of the 3D slicer project but a newbie.

I want to install the Slicer RT extension - specifically I want to make liberal use of the contour analysis module.

I am working within a hospital network so I suspect that security settings are wreaking havoc because I cannot download extensions via the extension manager.

I have had some success downloading Slicer RT manually.

However, when I use the install extensions from file button I get as far as the point at which the restart option should become available - but it just hangs.

I’m running 3D Slicer r29738 and the SlicerRT extension I have downloaded is r26654 - could this be the issue?

If I can’t get around this, would it be feasible to just add the Contour Analysis Module manually to 3D Slicer, since this is all I wish to do with SlicerRT at the moment.

Thanks for you help.

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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:** [July 7, 2021, 12:42pm UTC](https://discourse.slicer.org/t/slicer-rt-contour-analysis/18563/2 "2021-07-07T12:42:03Z")

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> [@liam-stubbington](#):
>
> I’m running 3D Slicer r29738 and the SlicerRT extension I have downloaded is r26654 - could this be the issue?

Yes, it will not be compatible.

Please download and install the latest preview version. Due to a recent change now you can install Slicer in your user’s local directory, and the extensions and settings will be stored there as well, so permissions will not be a problem.

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**Author:** ![liam-stubbington](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/liam-stubbington/32/11513_2.png) [@liam-stubbington](https://discourse.slicer.org/u/liam-stubbington)\
**Post date:** [July 7, 2021, 1:15pm UTC](https://discourse.slicer.org/t/slicer-rt-contour-analysis/18563/3 "2021-07-07T13:15:33Z")

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Will do, thanks!

Does this also explain why, after matching the extension and Slicer version number, I keep on running out of memory when calculating DICE for two simple structure sets?

Thanks for you help.

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/1/0/10aa84d34496cb1bc8f9d7c71a9845d290688bbb.png)

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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:** [July 7, 2021, 1:22pm UTC](https://discourse.slicer.org/t/slicer-rt-contour-analysis/18563/4 "2021-07-07T13:22:34Z")

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No, this is unrelated. After a quick search on memory allocation you will see several topics here on the forum that will help you.