# Register labelmap to volume with deformable registration

**URL:** <https://discourse.slicer.org/t/register-labelmap-to-volume-with-deformable-registration/5616>\
**Category:** Support\
**Created:** [February 2, 2019, 5:32am UTC](https://discourse.slicer.org/t/register-labelmap-to-volume-with-deformable-registration/5616 "2019-02-02T05:32:07Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Hamburgerfinger](https://avatars.discourse-cdn.com/v4/letter/h/eb9ed0/32.png) [@Hamburgerfinger](https://discourse.slicer.org/u/Hamburgerfinger)\
**Post date:** [February 2, 2019, 5:32am UTC](https://discourse.slicer.org/t/register-labelmap-to-volume-with-deformable-registration/5616/1 "2019-02-02T05:32:07Z")

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Hi! I’d like to deform an atlas (labelmap) to align with a CT image. Can someone please share a convenient way of doing this in Slicer?

Thanks!

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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:** [February 2, 2019, 10:20am UTC](https://discourse.slicer.org/t/register-labelmap-to-volume-with-deformable-registration/5616/2 "2019-02-02T10:20:38Z")

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If you have a CT with the labelmap, then you can [register](https://www.slicer.org/wiki/Documentation/Nightly/Registration/RegistrationLibrary) the two CTs and then put the labelmap in the resulting transform.

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**Author:** ![Hamburgerfinger](https://avatars.discourse-cdn.com/v4/letter/h/eb9ed0/32.png) [@Hamburgerfinger](https://discourse.slicer.org/u/Hamburgerfinger)\
**Post date:** [February 2, 2019, 1:18pm UTC](https://discourse.slicer.org/t/register-labelmap-to-volume-with-deformable-registration/5616/3 "2019-02-02T13:18:55Z")

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Thanks! If I don’t have two CTs, in other words I only have the label map defining a reference geometry and a want to deform that that to align with a single CT.

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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 2, 2019, 1:56pm UTC](https://discourse.slicer.org/t/register-labelmap-to-volume-with-deformable-registration/5616/4 "2019-02-02T13:56:56Z")

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You can use Fiducial Registration Wizard module (in SlicerIGT extension) to register the atlas labelmap to patient image by specifying matching anatomical landmark points.