# Registration of two DICOM-Sets from MRI

**URL:** <https://discourse.slicer.org/t/registration-of-two-dicom-sets-from-mri/23475>\
**Category:** Support\
**Tags:** registration, dicom\
**Created:** [May 18, 2022, 7:46pm UTC](https://discourse.slicer.org/t/registration-of-two-dicom-sets-from-mri/23475 "2022-05-18T19:46:33Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![Leon\_Dosendepp](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/leon_dosendepp/32/15322_2.png) [@Leon\_Dosendepp](https://discourse.slicer.org/u/Leon_Dosendepp)\
**Post date:** [June 8, 2022, 11:47am UTC](https://discourse.slicer.org/t/registration-of-two-dicom-sets-from-mri/23475/3 "2022-06-08T11:47:11Z")

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Hey piper,

first of all thank you! I had the project on hold so please excuse my late response. To harden the transform was the missing step i was looking for.  
For anybody else who has a similar problem, here is how i did it:  
Change one volume to be larger and so accommodate for second DICOM-Set

Volume Rendering – create new ROI-\>save

Converters-\>Crop volume-\>newROI as input ROI-\>save

[3D Slicer: Volume Rendering and ROI's - YouTube](https://youtu.be/2gWv4f-2zrA), [Merge dicom or nrrd or nii images](https://discourse.slicer.org/t/merge-dicom-or-nrrd-or-nii-images/1566), [Padding a volume with CropVolume requires "Interpolated Cropping"](https://discourse.slicer.org/t/padding-a-volume-with-cropvolume-requires-interpolated-cropping/8750)

Landmark registration fixed volume is new enlarged volume, moving volume is the other DICOM

Use as few landmarks as possible. The last row is a live preview of the transformation.

[![](https://img.youtube.com/vi/rBeh692v7kI/maxresdefault.jpg "Landmark registration with 3DSlicer") ](https://www.youtube.com/watch?v=rBeh692v7kI)

Harden transform with Transforms module

[https://slicer.readthedocs.io/en/latest/user\_guide/modules/transforms.html](https://slicer.readthedocs.io/en/latest/user_guide/modules/transforms.html)

Combine volumes of transformed and enlarged DICOMs with Add Scalar Volumes module

thanks again Piper

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