# Save as nrrd file from segmentation

**URL:** <https://discourse.slicer.org/t/save-as-nrrd-file-from-segmentation/32130>\
**Category:** Support\
**Created:** [October 10, 2023, 9:06am UTC](https://discourse.slicer.org/t/save-as-nrrd-file-from-segmentation/32130 "2023-10-10T09:06:40Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Chuan](https://avatars.discourse-cdn.com/v4/letter/c/4da419/32.png) [@Chuan](https://discourse.slicer.org/u/Chuan)\
**Post date:** [October 10, 2023, 9:06am UTC](https://discourse.slicer.org/t/save-as-nrrd-file-from-segmentation/32130/1 "2023-10-10T09:06:40Z")

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Dear community,

I would like to report a problem related to export nrrd file from segmentation.  
When I open the saved nrrd file, all the CT value information are lost (either 1 or 0).  
See as figure below

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/8/7/877fcd10d2f880bdb19cbc2c82e30119b9572034.png)

What I use is shown below

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/a/e/ae6ac80eb826710ee92c80149014f0e85da966a3.jpeg)

Does anyone meet the same problem as me?

Thank you very much in advance for any kinds of discussion and help

Best, Chuan

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<div class="post-metadata">

**Author:** ![Chuan](https://avatars.discourse-cdn.com/v4/letter/c/4da419/32.png) [@Chuan](https://discourse.slicer.org/u/Chuan)\
**Post date:** [October 10, 2023, 9:07am UTC](https://discourse.slicer.org/t/save-as-nrrd-file-from-segmentation/32130/2 "2023-10-10T09:07:45Z")

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I also try to add the reference volume, but still the original CT value information are missed

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<div class="post-metadata">

**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:** [October 10, 2023, 10:28am UTC](https://discourse.slicer.org/t/save-as-nrrd-file-from-segmentation/32130/3 "2023-10-10T10:28:51Z")

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The segmentation only stores labels. If you want to blank out regions of the original CT by segments then you can use the “Mask Volume” effect in Segment Editor.

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<div class="post-metadata">

**Author:** ![Chuan](https://avatars.discourse-cdn.com/v4/letter/c/4da419/32.png) [@Chuan](https://discourse.slicer.org/u/Chuan)\
**Post date:** [October 11, 2023, 11:54am UTC](https://discourse.slicer.org/t/save-as-nrrd-file-from-segmentation/32130/4 "2023-10-11T11:54:19Z")

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Thanks Lassoan, that works!