# Separate Segmentation

**URL:** <https://discourse.slicer.org/t/separate-segmentation/22776>\
**Category:** Support\
**Tags:** segmentation\
**Created:** [March 31, 2022, 1:00pm UTC](https://discourse.slicer.org/t/separate-segmentation/22776 "2022-03-31T13:00:49Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Jakob](https://avatars.discourse-cdn.com/v4/letter/j/71c47a/32.png) [@Jakob](https://discourse.slicer.org/u/Jakob)\
**Post date:** [March 31, 2022, 1:00pm UTC](https://discourse.slicer.org/t/separate-segmentation/22776/1 "2022-03-31T13:00:49Z")

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Operating system: macOS Monterey  
Slicer version: 4.13

Hello! I’ve made a segmentation of the upper airway using the Paint and Grow From Seeds Module in 3D Slicer. Now I would like to separate the segmentation of the upper airway in different segmentations (one for the nasopharyngeal part, one for the oropharyngeal part…) in order to calculate the volume of the segmentation for each part separately. How can I do this?  
Thank you very much!

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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:** [March 31, 2022, 1:02pm UTC](https://discourse.slicer.org/t/separate-segmentation/22776/2 "2022-03-31T13:02:30Z")

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You can use the technique described in the [craniotomy segmentation recipe](https://lassoan.github.io/SlicerSegmentationRecipes/Craniotomy/).

[![](https://lassoan.github.io/SlicerSegmentationRecipes/Craniotomy/image-005.png) ](https://lassoan.github.io/SlicerSegmentationRecipes/Craniotomy/image-005.png)

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**Author:** ![rbumm](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/rbumm/32/9404_2.png) [@rbumm](https://discourse.slicer.org/u/rbumm)\
**Post date:** [March 31, 2022, 1:33pm UTC](https://discourse.slicer.org/t/separate-segmentation/22776/3 "2022-03-31T13:33:02Z")

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Alternatively, you could clone the airway segmentation you have in the “Data” module to f.e.“trachea”:

![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/9/a/9ad14d8b8f2d5c7143835a261c838b4d877b5161.png)

then go “Segment editor” and use the “Scissors” effect with “Erase inside” to cut away the regions from the airway segmentation that you do not want in “trachea”:

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/4/f/4f47668944f8a6d7caf5b9343fa6da46c0782e52.jpeg)

(Slicer demo data set with permission)

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**Author:** ![Jakob](https://avatars.discourse-cdn.com/v4/letter/j/71c47a/32.png) [@Jakob](https://discourse.slicer.org/u/Jakob)\
**Post date:** [April 1, 2022, 1:47pm UTC](https://discourse.slicer.org/t/separate-segmentation/22776/4 "2022-04-01T13:47:01Z")

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Thank you very much for your solutions. It was exactly I was looking for.