# Matching CT scans and MRIs

**URL:** <https://discourse.slicer.org/t/matching-ct-scans-and-mris/17567>\
**Category:** Support\
**Tags:** segmentation\
**Created:** [May 11, 2021, 10:24am UTC](https://discourse.slicer.org/t/matching-ct-scans-and-mris/17567 "2021-05-11T10:24:56Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Vincebisca](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/vincebisca/32/10722_2.png) [@Vincebisca](https://discourse.slicer.org/u/Vincebisca)\
**Post date:** [May 11, 2021, 10:24am UTC](https://discourse.slicer.org/t/matching-ct-scans-and-mris/17567/1 "2021-05-11T10:24:56Z")

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Hello everyone,

I have been wondering : is there a way to match IRM and CT scans sequences in 3D Slicer?  
I explain : I have been working for a few weeks on 3D Slicer and I am exploring the possibility of using two sequences in parallel for segmentation. For example, to segment a bone tumor, using a CT scan to model the bone, and an MRI for the tumor and soft tissues.

Are they dedicated features to use 2 sequences? If the CT and MRI sequences are not well aligned, is there a procedure to match them well for segmentation?

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:** [May 13, 2021, 6:19am UTC](https://discourse.slicer.org/t/matching-ct-scans-and-mris/17567/2 "2021-05-13T06:19:13Z")

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You can align MR and CT scans fully automatically using intensity-based registration as described [here](https://slicer.readthedocs.io/en/latest/user_guide/registration.html#automatic-image-registration).