# Segmentation File saving as 4 dimensions in new version instead of 3

**URL:** <https://discourse.slicer.org/t/segmentation-file-saving-as-4-dimensions-in-new-version-instead-of-3/42224>\
**Category:** Support\
**Created:** [March 19, 2025, 5:21pm UTC](https://discourse.slicer.org/t/segmentation-file-saving-as-4-dimensions-in-new-version-instead-of-3/42224 "2025-03-19T17:21:00Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![acoggins](https://avatars.discourse-cdn.com/v4/letter/a/7993a0/32.png) [@acoggins](https://discourse.slicer.org/u/acoggins)\
**Post date:** [March 19, 2025, 5:21pm UTC](https://discourse.slicer.org/t/segmentation-file-saving-as-4-dimensions-in-new-version-instead-of-3/42224/1 "2025-03-19T17:21:00Z")

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Using the new version of slicer my segmentation files (.seg.nrrd) are saving as 4 dimensions:  
dimension: 4  
space: left-posterior-superior  
sizes: 2 512 512 156

In previous versions, my segmentation files save as 3 dimensions:  
dimension: 3  
space: left-posterior-superior  
sizes: 512 512 156

Is there a way to save the segmentation files as 3 dimensions to match my old files and codes?

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**Author:** ![muratmaga](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/muratmaga/32/3622_2.png) [@muratmaga](https://discourse.slicer.org/u/muratmaga)\
**Post date:** [March 19, 2025, 6:12pm UTC](https://discourse.slicer.org/t/segmentation-file-saving-as-4-dimensions-in-new-version-instead-of-3/42224/2 "2025-03-19T18:12:16Z")

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If you allowed overlap with segments (that is a voxel can be in more than one segment), I think it is always saved as 4D format.

I am not seeing any difference on my end between 5.8.1 and the latest preview.

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**Author:** ![acoggins](https://avatars.discourse-cdn.com/v4/letter/a/7993a0/32.png) [@acoggins](https://discourse.slicer.org/u/acoggins)\
**Post date:** [March 19, 2025, 6:30pm UTC](https://discourse.slicer.org/t/segmentation-file-saving-as-4-dimensions-in-new-version-instead-of-3/42224/3 "2025-03-19T18:30:43Z")

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The older version I’m using is 4.11.20200930 and the new version is 5.8.0

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**Author:** ![pieper](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/pieper/32/8_2.png) [@pieper](https://discourse.slicer.org/u/pieper)\
**Post date:** [March 19, 2025, 6:32pm UTC](https://discourse.slicer.org/t/segmentation-file-saving-as-4-dimensions-in-new-version-instead-of-3/42224/4 "2025-03-19T18:32:50Z")

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In the Segmentations module you can collapse the layers.

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<div class="post-metadata">

**Author:** ![acoggins](https://avatars.discourse-cdn.com/v4/letter/a/7993a0/32.png) [@acoggins](https://discourse.slicer.org/u/acoggins)\
**Post date:** [March 19, 2025, 6:47pm UTC](https://discourse.slicer.org/t/segmentation-file-saving-as-4-dimensions-in-new-version-instead-of-3/42224/5 "2025-03-19T18:47:29Z")

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This worked, thank you!

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**Author:** ![muratmaga](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/muratmaga/32/3622_2.png) [@muratmaga](https://discourse.slicer.org/u/muratmaga)\
**Post date:** [March 19, 2025, 6:52pm UTC](https://discourse.slicer.org/t/segmentation-file-saving-as-4-dimensions-in-new-version-instead-of-3/42224/6 "2025-03-19T18:52:52Z")

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> [@acoggins](#):
>
> The older version I’m using is 4.11.20200930 and the new version is 5.8.0

keep in mind those are both not maintained. The latest stable is 5.8.1