# How to segment one/more organs using 3DSlicer and add to the existing segmentation file?

**URL:** <https://discourse.slicer.org/t/how-to-segment-one-more-organs-using-3dslicer-and-add-to-the-existing-segmentation-file/22444>\
**Category:** Support\
**Tags:** segmentation, nifti\
**Created:** [March 11, 2022, 3:12am UTC](https://discourse.slicer.org/t/how-to-segment-one-more-organs-using-3dslicer-and-add-to-the-existing-segmentation-file/22444 "2022-03-11T03:12:58Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Js165](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/js165/32/14631_2.png) [@Js165](https://discourse.slicer.org/u/Js165)\
**Post date:** [March 11, 2022, 3:12am UTC](https://discourse.slicer.org/t/how-to-segment-one-more-organs-using-3dslicer-and-add-to-the-existing-segmentation-file/22444/1 "2022-03-11T03:12:58Z")

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I have original CT scans (.nii format) and a corresponding segmentation file (.nii format). Now I want to manually segment one/more organs using 3DSlicer and add to the existing segmentation file (.nii format). I am not sure how to perform this task. It will be helpful if you kindly suggest me the procedure.

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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 11, 2022, 5:12am UTC](https://discourse.slicer.org/t/how-to-segment-one-more-organs-using-3dslicer-and-add-to-the-existing-segmentation-file/22444/2 "2022-03-11T05:12:25Z")

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If you can successfully import the existing segmentation into Slicer and the CT scan, then all you need is to create a new empty segmentation layer for your new organ segmentation, and continue from there.

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**Author:** ![Js165](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/js165/32/14631_2.png) [@Js165](https://discourse.slicer.org/u/Js165)\
**Post date:** [March 11, 2022, 6:47pm UTC](https://discourse.slicer.org/t/how-to-segment-one-more-organs-using-3dslicer-and-add-to-the-existing-segmentation-file/22444/3 "2022-03-11T18:47:43Z")

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Thanks a lot! It worked. 😀