# How to superimpose two CT/CBCTs?

**URL:** <https://discourse.slicer.org/t/how-to-superimpose-two-ct-cbcts/10322>\
**Category:** Support\
**Tags:** segmentation, dicom\
**Created:** [February 18, 2020, 4:23am UTC](https://discourse.slicer.org/t/how-to-superimpose-two-ct-cbcts/10322 "2020-02-18T04:23:04Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![ddii](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/ddii/32/65366_2.png) [@ddii](https://discourse.slicer.org/u/ddii)\
**Post date:** [February 18, 2020, 4:23am UTC](https://discourse.slicer.org/t/how-to-superimpose-two-ct-cbcts/10322/1 "2020-02-18T04:23:04Z")

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How do you superimpose two scans? or even move the VR side by side?

 ![compvr](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/5/5/5527a972f3a352229a1ee76bc0a754828a9d23f5.jpeg)

Thanks

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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:** [February 18, 2020, 7:47am UTC](https://discourse.slicer.org/t/how-to-superimpose-two-ct-cbcts/10322/2 "2020-02-18T07:47:09Z")

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You’re looking for Registration tools. You can do the basic translation (moving) of the volume in Transforms module:

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/d/9/d9b7efea5d93379e1c86d01fb17bc75d170c39c5.png)

If you need more precise or automatic registration, look into BRAINS or Elastix registration modules.

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**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:** [February 18, 2020, 1:59pm UTC](https://discourse.slicer.org/t/how-to-superimpose-two-ct-cbcts/10322/3 "2020-02-18T13:59:03Z")

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You can also register volumes based on matching anatomical landmarks using SlicerIGT extension’s Fiducial Registration Wizard module.

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**Author:** ![ddii](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/ddii/32/65366_2.png) [@ddii](https://discourse.slicer.org/u/ddii)\
**Post date:** [February 24, 2020, 2:06pm UTC](https://discourse.slicer.org/t/how-to-superimpose-two-ct-cbcts/10322/4 "2020-02-24T14:06:40Z")

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Thank you very much! I will try that. Do you have any video tutorials that I can see?

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**Author:** ![ddii](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/ddii/32/65366_2.png) [@ddii](https://discourse.slicer.org/u/ddii)\
**Post date:** [February 24, 2020, 2:07pm UTC](https://discourse.slicer.org/t/how-to-superimpose-two-ct-cbcts/10322/5 "2020-02-24T14:07:55Z")

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Thank you very much! I have downloaded the extension. Would you send me the video tutorials if you have one? Thanks,

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**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:** [February 25, 2020, 6:53pm UTC](https://discourse.slicer.org/t/how-to-superimpose-two-ct-cbcts/10322/6 "2020-02-25T18:53:32Z")

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You can find tutorials about SlicerIGT modules here: [http://www.slicerigt.org/wp/user-tutorial/](http://www.slicerigt.org/wp/user-tutorial/)