# Can segments be used as input regions in feature calculation?

**URL:** <https://discourse.slicer.org/t/can-segments-be-used-as-input-regions-in-feature-calculation/3878>\
**Category:** Feature requests\
**Tags:** segmentation\
**Created:** [August 24, 2018, 11:53am UTC](https://discourse.slicer.org/t/can-segments-be-used-as-input-regions-in-feature-calculation/3878 "2018-08-24T11:53:20Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![TingtingYu](https://avatars.discourse-cdn.com/v4/letter/t/b38774/32.png) [@TingtingYu](https://discourse.slicer.org/u/TingtingYu)\
**Post date:** [August 24, 2018, 11:53am UTC](https://discourse.slicer.org/t/can-segments-be-used-as-input-regions-in-feature-calculation/3878/1 "2018-08-24T11:53:20Z")

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Hi,

I loaded DICOM-RT using DICOM module. When I turned to Data Module, the RT structure was shown as a segment. Can this segment used as input region in radiomics calculation? I am a little confused about that. RT-Struct are planar contour, it is not a volume. But when I use it to do the radiomics calculation, I get the same answer as I use the labelmap (I use the segmentation module to export the labelmap from segment) as input region. Many thanks.

Best,  
Tingting

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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 24, 2018, 12:30pm UTC](https://discourse.slicer.org/t/can-segments-be-used-as-input-regions-in-feature-calculation/3878/2 "2018-08-24T12:30:37Z")

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> [@TingtingYu](#):
>
> Can this segment used as input region in radiomics calculation?

Yes. Segmentation nodes dynamically convert between different representations (planar contour, binary labelmap, closed surface, etc.) as needed.

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**Author:** ![fedorov](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/fedorov/32/14_2.png) [@fedorov](https://discourse.slicer.org/u/fedorov)\
**Post date:** [August 24, 2018, 5:59pm UTC](https://discourse.slicer.org/t/can-segments-be-used-as-input-regions-in-feature-calculation/3878/3 "2018-08-24T17:59:41Z")

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There are at least 2 extensions in Slicer that calculate radiomics features.

- If you use the [SlicerRadiomics](https://github.com/Radiomics/SlicerRadiomics) extension, you can use Segmentation segments directly.
- If you use [HeterogeneityCAD](https://www.slicer.org/wiki/Documentation/Nightly/Modules/HeterogeneityCAD) extension, I think you will first need to convert segmentation into binary labelmap.

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**Author:** ![TingtingYu](https://avatars.discourse-cdn.com/v4/letter/t/b38774/32.png) [@TingtingYu](https://discourse.slicer.org/u/TingtingYu)\
**Post date:** [August 25, 2018, 10:44am UTC](https://discourse.slicer.org/t/can-segments-be-used-as-input-regions-in-feature-calculation/3878/4 "2018-08-25T10:44:06Z")

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Hi Andras,

Got it. Thank you.

Best,  
Tingting

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**Author:** ![TingtingYu](https://avatars.discourse-cdn.com/v4/letter/t/b38774/32.png) [@TingtingYu](https://discourse.slicer.org/u/TingtingYu)\
**Post date:** [August 25, 2018, 10:54am UTC](https://discourse.slicer.org/t/can-segments-be-used-as-input-regions-in-feature-calculation/3878/5 "2018-08-25T10:54:18Z")

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Hi Andrey,

Thank you for your detailed suggestions. Really appreciated that. I actually have tried both of them. Quick questions, do CT images can also be used in heterogeneityCAD or this module can only use DCE-MRI images?

Best,  
Tingting

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**Author:** ![fedorov](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/fedorov/32/14_2.png) [@fedorov](https://discourse.slicer.org/u/fedorov)\
**Post date:** [August 26, 2018, 8:56pm UTC](https://discourse.slicer.org/t/can-segments-be-used-as-input-regions-in-feature-calculation/3878/6 "2018-08-26T20:56:45Z")

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I’ve heard people using heterogeneityCAD for CT, but I have not developed that module, and I have not used it myself. @jayender should be able to give the authoritative answer.

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**Author:** ![TingtingYu](https://avatars.discourse-cdn.com/v4/letter/t/b38774/32.png) [@TingtingYu](https://discourse.slicer.org/u/TingtingYu)\
**Post date:** [August 27, 2018, 2:17am UTC](https://discourse.slicer.org/t/can-segments-be-used-as-input-regions-in-feature-calculation/3878/7 "2018-08-27T02:17:46Z")

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Hi Andrey,

Thank you. I will go to his website and then read the related topics to see whether I can dig something.

Best,  
Tingting