# Oropharyngeal airway segmentation

**URL:** <https://discourse.slicer.org/t/oropharyngeal-airway-segmentation/43871>\
**Category:** Support\
**Tags:** segmentation\
**Created:** [July 28, 2025, 10:26am UTC](https://discourse.slicer.org/t/oropharyngeal-airway-segmentation/43871 "2025-07-28T10:26:30Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![bilbro](https://avatars.discourse-cdn.com/v4/letter/b/d9b06d/32.png) [@bilbro](https://discourse.slicer.org/u/bilbro)\
**Post date:** [July 28, 2025, 10:26am UTC](https://discourse.slicer.org/t/oropharyngeal-airway-segmentation/43871/1 "2025-07-28T10:26:30Z")

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Can somebody help me how to segment oropharyngeal airway in the 3D slicer. Thank you

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**Author:** ![nagy.attila](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/nagy.attila/32/79295_2.png) [@nagy.attila](https://discourse.slicer.org/u/nagy.attila)\
**Post date:** [July 28, 2025, 11:04am UTC](https://discourse.slicer.org/t/oropharyngeal-airway-segmentation/43871/2 "2025-07-28T11:04:01Z")

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Hi,

What modality? If you have a CT that’s super easy hen because the Hounsfield value for air is pretty much different from anything else on the scan.  
If this is the case, a simple Threshold operation will do. You may need to cut a few parts (scissor tool), but that’s about it.  
With CBCT and MRI it is a bit more complicated, but not by much.  
If you plan to use the segment in other software (FEM for example), then it gets a bit more tricky but then most of the difficulties can be treated outside Slicer.

Let me know if you have further questions!  
Attila  
Attila

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**Author:** ![bilbro](https://avatars.discourse-cdn.com/v4/letter/b/d9b06d/32.png) [@bilbro](https://discourse.slicer.org/u/bilbro)\
**Post date:** [August 5, 2025, 1:40pm UTC](https://discourse.slicer.org/t/oropharyngeal-airway-segmentation/43871/3 "2025-08-05T13:40:19Z")

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Thank you for the inputs. I want to do it using CBCT. Is it possible?

Also i need to assess the volume of the segmented airway

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**Author:** ![nagy.attila](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/nagy.attila/32/79295_2.png) [@nagy.attila](https://discourse.slicer.org/u/nagy.attila)\
**Post date:** [August 5, 2025, 2:14pm UTC](https://discourse.slicer.org/t/oropharyngeal-airway-segmentation/43871/5 "2025-08-05T14:14:25Z")

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CBCT should work nicely. It’s just that the threshold tool will not use HU units (someone can correct me if I’m wrong here 🙂 )  
Other than that, the procedure should be the same. Segment, correct, the segmentation, and there you go.  
Volume: [segment statistics](https://slicer.readthedocs.io/en/latest/user_guide/modules/segmentstatistics.html) should cover you.

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<div class="post-metadata">

**Author:** ![bilbro](https://avatars.discourse-cdn.com/v4/letter/b/d9b06d/32.png) [@bilbro](https://discourse.slicer.org/u/bilbro)\
**Post date:** [August 5, 2025, 4:14pm UTC](https://discourse.slicer.org/t/oropharyngeal-airway-segmentation/43871/6 "2025-08-05T16:14:50Z")

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can you please guide with any document or videos to do a airway segment. As am new to slicer 3d struggling lil bit to find a way to do it. Thanks in advance

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**Author:** ![nagy.attila](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/nagy.attila/32/79295_2.png) [@nagy.attila](https://discourse.slicer.org/u/nagy.attila)\
**Post date:** [August 14, 2025, 7:38pm UTC](https://discourse.slicer.org/t/oropharyngeal-airway-segmentation/43871/7 "2025-08-14T19:38:41Z")

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Sorry for the late reply!  
I’m planning to put together a short video, in case it’s still interesting to you.

Just need a little more patience, I’m a bit busy these days.  
Will get back to you in a week or so.

Best.

Attila