# Anyone Know How to coregistering four images

**URL:** <https://discourse.slicer.org/t/anyone-know-how-to-coregistering-four-images/28899>\
**Category:** Support\
**Tags:** segmentation, extensions-manager, dicom\
**Created:** [April 14, 2023, 4:03am UTC](https://discourse.slicer.org/t/anyone-know-how-to-coregistering-four-images/28899 "2023-04-14T04:03:40Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![akmal871026](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/akmal871026/32/11642_2.png) [@akmal871026](https://discourse.slicer.org/u/akmal871026)\
**Post date:** [April 14, 2023, 4:03am UTC](https://discourse.slicer.org/t/anyone-know-how-to-coregistering-four-images/28899/1 "2023-04-14T04:03:40Z")

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Anyone know, how to do coregistering using four images.

That I want to know is like the metric alignment for four images,

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<div class="post-metadata">

**Author:** ![ebrahim](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/ebrahim/32/13403_2.png) [@ebrahim](https://discourse.slicer.org/u/ebrahim)\
**Post date:** [April 14, 2023, 2:19pm UTC](https://discourse.slicer.org/t/anyone-know-how-to-coregistering-four-images/28899/2 "2023-04-14T14:19:26Z")

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You could pick one image and register the other 3 images to it.

One way to make the choice less arbitrary could be to compute all `4 choose 2` pairwise registrations and choose whichever of the images has smallest mean deformation needed to align it to the other three images.

The other approach is atlas construction, but I guess four images is too few to do that.