# Label Selection

**URL:** <https://discourse.slicer.org/t/label-selection/591>\
**Category:** Support\
**Tags:** diffusion\
**Created:** [June 28, 2017, 3:37pm UTC](https://discourse.slicer.org/t/label-selection/591 "2017-06-28T15:37:19Z")\
**Posts on this page:** 6\
**Page:** 1

<div class="post-metadata">

**Author:** ![LGG](https://avatars.discourse-cdn.com/v4/letter/l/ea666f/32.png) [@LGG](https://discourse.slicer.org/u/LGG)\
**Post date:** [June 28, 2017, 3:37pm UTC](https://discourse.slicer.org/t/label-selection/591/1 "2017-06-28T15:37:19Z")

</div>

Hi everyone,

in Slicer 4.6.2 I can not find Fiber bundle label select in the Module-list. Since I want to do tractography between two labels or a label and a model I wanted to ask how I know the number of the label I want to use? (to type in in when Using Tractography ROI Selection in “inclusion labels”) So far I wasn’t able to visualize fibers between two labels that are not in drawn in the same MRI-image.

Thanks!

Operating system: MacOs Sierra 10.12.5  
Slicer version: 4.6.2

---

<div class="post-metadata">

**Author:** ![ihnorton](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/ihnorton/32/9_2.png) [@ihnorton](https://discourse.slicer.org/u/ihnorton)\
**Post date:** [June 28, 2017, 3:43pm UTC](https://discourse.slicer.org/t/label-selection/591/2 "2017-06-28T15:43:22Z")

</div>

Please use the Slicer nightly build, and install SlicerDMRI: [http://dmri.slicer.org/download/](http://dmri.slicer.org/download/)

---

<div class="post-metadata">

**Author:** ![ihnorton](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/ihnorton/32/9_2.png) [@ihnorton](https://discourse.slicer.org/u/ihnorton)\
**Post date:** [June 28, 2017, 6:47pm UTC](https://discourse.slicer.org/t/label-selection/591/3 "2017-06-28T18:47:21Z")

</div>

Also, I should add (thanks @ljod), that the module can be found as below after SlicerDMRI is installed:

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/b/e/be477510e81b131cd0d72e985b327c9ed2013753.png)

---

<div class="post-metadata">

**Author:** ![LGG](https://avatars.discourse-cdn.com/v4/letter/l/ea666f/32.png) [@LGG](https://discourse.slicer.org/u/LGG)\
**Post date:** [June 30, 2017, 11:29am UTC](https://discourse.slicer.org/t/label-selection/591/4 "2017-06-30T11:29:20Z")

</div>

Thanks Isaiah!

I wasn’t aware that Tractography ROI Selection is the same as Fiber bundle label select…  
Now I am still not sure which numbers to give the software (in “inclusion labels”) to be sure that it takes the labels I want it to track in between - it is a number refering to a certain labelmap, not an amount of labels, right? And does it only work with labelmaps or also with models?

Sorry for the many questions!

Lioba

---

<div class="post-metadata">

**Author:** ![ihnorton](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/ihnorton/32/9_2.png) [@ihnorton](https://discourse.slicer.org/u/ihnorton)\
**Post date:** [June 30, 2017, 1:27pm UTC](https://discourse.slicer.org/t/label-selection/591/5 "2017-06-30T13:27:56Z")

</div>

> [@LGG](#):
>
> it is a number refering to a certain labelmap

It’s referring to the highlighted value in the given labelmap.

> [@LGG](#):
>
> And does it only work with labelmaps or also with models?

Only labelmaps, but you can create one from a model with “Model to Label Map” module.

---

<div class="post-metadata">

**Author:** ![LGG](https://avatars.discourse-cdn.com/v4/letter/l/ea666f/32.png) [@LGG](https://discourse.slicer.org/u/LGG)\
**Post date:** [August 23, 2017, 2:04pm UTC](https://discourse.slicer.org/t/label-selection/591/6 "2017-08-23T14:04:30Z")

</div>

Hi Isaiah,

sorry, I still don’t understand where to find the number or given value of a labelmap. I thought it to be the number behind the “node\_ \_” when opening the node inspector because I can’t find any highlighted value.

What I would like to do is to extract trackts from a whole brain tractography through a model or labelmap I created using module Tractography ROI selection. But whatever number I try, no fiber is being tracked.

Also what confuses me - the “selection region label map” is the labelmap I would like to track through, no? Why do I still have to select inclusion labels?

And my last question concerns the “model to labelmap” module: This won’t work with the model I created. In the Slicer module explanation I read it would only work for surface models, may this be the reason?

Thanks!  
Lioba