# Problem when uploading volumes for registration

**URL:** <https://discourse.slicer.org/t/problem-when-uploading-volumes-for-registration/24582>\
**Category:** Support\
**Created:** [July 31, 2022, 7:03pm UTC](https://discourse.slicer.org/t/problem-when-uploading-volumes-for-registration/24582 "2022-07-31T19:03:03Z")\
**Posts on this page:** 8\
**Page:** 1

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**Author:** ![Valeria\_Onofrj](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/valeria_onofrj/32/16173_2.png) [@Valeria\_Onofrj](https://discourse.slicer.org/u/Valeria_Onofrj)\
**Post date:** [July 31, 2022, 7:03pm UTC](https://discourse.slicer.org/t/problem-when-uploading-volumes-for-registration/24582/1 "2022-07-31T19:03:03Z")

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Operating system:MAC  
Slicer version:4.13  
Expected behavior:I have uploaded DWI and FLAIR and I should be able to coregister FLAIR on DWI

Actual behavior:The Brainregistration plug in does not recognise the DWI, therefore I can not upload it and can’t coregister the 2 volumes

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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:** [August 1, 2022, 5:56pm UTC](https://discourse.slicer.org/t/problem-when-uploading-volumes-for-registration/24582/2 "2022-08-01T17:56:37Z")

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If the DWI was loaded as a diffusion volume you’ll need to extract a scalar from it. E.g.estimate the tensor and use the baseline image or create a scalar map like FA (you can do these steps with SlicerDMRI).

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**Author:** ![Valeria\_Onofrj](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/valeria_onofrj/32/16173_2.png) [@Valeria\_Onofrj](https://discourse.slicer.org/u/Valeria_Onofrj)\
**Post date:** [August 2, 2022, 3:05pm UTC](https://discourse.slicer.org/t/problem-when-uploading-volumes-for-registration/24582/3 "2022-08-02T15:05:54Z")

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I tried but DMRI does not open the DWI

Valeria

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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:** [August 2, 2022, 3:11pm UTC](https://discourse.slicer.org/t/problem-when-uploading-volumes-for-registration/24582/4 "2022-08-02T15:11:58Z")

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Check the `Volume type` field of the `Volume Information` tab of the `Volumes` module. It should be `Scalar` to work with the registration tools. If not you need to convert it, e.g. with the Vector to Scalar Volume module, depending on the type.

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/9/9/9915a964d38e70b75f81290bf9ae172a27154f6e.png)

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<div class="post-metadata">

**Author:** ![Valeria\_Onofrj](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/valeria_onofrj/32/16173_2.png) [@Valeria\_Onofrj](https://discourse.slicer.org/u/Valeria_Onofrj)\
**Post date:** [August 9, 2022, 11:54am UTC](https://discourse.slicer.org/t/problem-when-uploading-volumes-for-registration/24582/5 "2022-08-09T11:54:53Z")

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If I open the Image on volume I see it’s a MRMLMulti in the volume type section.  
I still can’t do the registration.

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<div class="post-metadata">

**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:** [August 9, 2022, 1:41pm UTC](https://discourse.slicer.org/t/problem-when-uploading-volumes-for-registration/24582/6 "2022-08-09T13:41:30Z")

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That means your DWI was loaded as a [MultiVolume](https://www.slicer.org/wiki/Documentation/Nightly/Modules/MultiVolumeExplorer) and you can either use the MultiVolume modules to extract a frame from it for registration. Or you can [convert it to a Sequence](https://slicer.readthedocs.io/en/latest/user_guide/modules/sequences.html?highlight=multivolume#convert-multivolume-node-to-sequence-node) and use that newer infrastructure.

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<div class="post-metadata">

**Author:** ![Valeria\_Onofrj](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/valeria_onofrj/32/16173_2.png) [@Valeria\_Onofrj](https://discourse.slicer.org/u/Valeria_Onofrj)\
**Post date:** [August 9, 2022, 2:10pm UTC](https://discourse.slicer.org/t/problem-when-uploading-volumes-for-registration/24582/7 "2022-08-09T14:10:33Z")

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I tried to use the multivolume but I keep having thé same problem: i can not use thé dei images for registration

Valeria

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<div class="post-metadata">

**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:** [August 9, 2022, 3:10pm UTC](https://discourse.slicer.org/t/problem-when-uploading-volumes-for-registration/24582/8 "2022-08-09T15:10:52Z")

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What I mean is that you need to extract a frame as a single scalar volume from the multivolume and then you can use that frame for registration.