# 3D model -\> DICOM/nii conversion

**URL:** <https://discourse.slicer.org/t/3d-model-dicom-nii-conversion/14045>\
**Category:** Support\
**Tags:** dicom, 3d-model, conversion\
**Created:** [October 14, 2020, 10:51pm UTC](https://discourse.slicer.org/t/3d-model-dicom-nii-conversion/14045 "2020-10-14T22:51:56Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![JanWitowski](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/janwitowski/32/4512_2.png) [@JanWitowski](https://discourse.slicer.org/u/JanWitowski)\
**Post date:** [October 14, 2020, 11:14pm UTC](https://discourse.slicer.org/t/3d-model-dicom-nii-conversion/14045/2 "2020-10-14T23:14:08Z")

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If I understand correctly, you don’t have a segmentation file, but rather mesh that was a result of the segmentation? If you can convert the .ply to .stl, then you could simply drag and drop the model to Slicer and open it as e.g. Segmentation node, [as described here](https://discourse.slicer.org/t/3d-model-to-segmentation/5135/2).

There are many ways to do registration in Slicer, too. You can even perform registration directly on the model and loaded volume through fiducial registration ([relevant thread](https://discourse.slicer.org/t/non-rigid-registration-between-dicom-volume-and-stl-alias-volume/3225)).

You have also received some useful comments [on the ITK forum](https://discourse.itk.org/t/3d-model-dicom-nii-conversion/3536).  
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