# Fast marching problem ver 5.0.2

**URL:** <https://discourse.slicer.org/t/fast-marching-problem-ver-5-0-2/24078>\
**Category:** Support\
**Created:** [June 28, 2022, 12:44pm UTC](https://discourse.slicer.org/t/fast-marching-problem-ver-5-0-2/24078 "2022-06-28T12:44:13Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Nguyen\_Hieu](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/nguyen_hieu/32/15818_2.png) [@Nguyen\_Hieu](https://discourse.slicer.org/u/Nguyen_Hieu)\
**Post date:** [June 28, 2022, 12:44pm UTC](https://discourse.slicer.org/t/fast-marching-problem-ver-5-0-2/24078/1 "2022-06-28T12:44:13Z")

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Operating system: Windows 10  
Slicer version: 5.0.2  
I use this version and install Fast Marching but this extension is not appeared in “Segment Editor”, its interface is quite different from this video [Fast marching segmentation in 3D Slicer - YouTube](https://www.youtube.com/watch?v=XPx0tStSsnA&ab_channel=PerkLabResearch)  
So how can I solve this problem?  
In addition, I want to measure mastoid air cells, middle ear spaces in temporal bone CT scan, any suggestions to do this? because the mastoid air cells are separated by bone septa so I think they’re difficult to measure the volume.  
Thanks so much 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:** [June 28, 2022, 4:26pm UTC](https://discourse.slicer.org/t/fast-marching-problem-ver-5-0-2/24078/2 "2022-06-28T16:26:53Z")

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Fast marching effect works exactly the same as it is shown in the video. There was a minor change in the Segment Editor module layout in that the toolbar is now vertical, while previously it was horizontal:

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/7/1/7170132f8ee65782c09c4feeb78619b01a80a640.png)

Note that the Fast Marching effect is provided by SegmentEditorExtraEffects extension, so you need to install this extension to make the effect show up in Segment Editor.

I would recommend to create a new topic for your segmentation question, describing what you want to segment, what you have tried so far, and how it worked; illustrated by screenshots.