# Registration of head CT and MRI of sheep

**URL:** <https://discourse.slicer.org/t/registration-of-head-ct-and-mri-of-sheep/14134>\
**Category:** Support\
**Created:** [October 19, 2020, 12:17pm UTC](https://discourse.slicer.org/t/registration-of-head-ct-and-mri-of-sheep/14134 "2020-10-19T12:17:26Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![ADeane](https://avatars.discourse-cdn.com/v4/letter/a/8c91f0/32.png) [@ADeane](https://discourse.slicer.org/u/ADeane)\
**Post date:** [October 19, 2020, 12:17pm UTC](https://discourse.slicer.org/t/registration-of-head-ct-and-mri-of-sheep/14134/1 "2020-10-19T12:17:26Z")

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Hi all,

Goal: accurately registering head CT (bone) and T1 MRI from ovine subject - to be used for surgical planning.

Problem: unable to apply general registration (BRAINS)

I am new to using 3D slicer for registration. I am currently attempting to register CT bone and T1 weighted MRI scans (head). The resulting registration will be used to plan neurosurgeries.

So far, I have manually transformed the CT scan to align with the MRI (both have been centred). I have attempted to then use general registration (BRAINS), however the resulting output is grey squares.

See google drive link for the DICOM images being used.

> **[Ovine CT-MRI - Google Drive](https://drive.google.com/drive/folders/1KQdATjr6bvReNBIXqQa6QRO-NH9x3m0n?usp=sharing)**

Any help or guidance would be greatly appreciated!

Ashley

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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:** [October 20, 2020, 4:33am UTC](https://discourse.slicer.org/t/registration-of-head-ct-and-mri-of-sheep/14134/2 "2020-10-20T04:33:01Z")

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Default parameters of “General registration (BRAINS)” module work for human brain registration but you need to tune the parameters to work for other cases.

“General registration (Elastix”) module (provided by SlicerElastix extension) is much more robust. Its default parameter set works well for most registration tasks, as long as the two images approximately contain the same region.

Fully automatic registration of your data set took 2 minutes on my laptop using Elastix, using default parameter set, and the result looks almost perfect:

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/7/0/70630cd799df9c01be990709bf3810d75cfd299e.jpeg)

![SlicerCapture](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/2/5/2561cc893ce870edaafb0504b6d33fe4de711c66.gif)

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**Author:** ![CASmith](https://avatars.discourse-cdn.com/v4/letter/c/a9a28c/32.png) [@CASmith](https://discourse.slicer.org/u/CASmith)\
**Post date:** [January 10, 2022, 12:33am UTC](https://discourse.slicer.org/t/registration-of-head-ct-and-mri-of-sheep/14134/3 "2022-01-10T00:33:00Z")

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Hi Ashley,

I am working on a similar project as you were, where a regisetered CT/MRI image of a sheep head would be amazingly useful for device design and surgical planning,

Is there any chance you would be able to post an updated link to you dicom files (or the registered image)?

Best regards,  
Chris S

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**Author:** ![ADeane](https://avatars.discourse-cdn.com/v4/letter/a/8c91f0/32.png) [@ADeane](https://discourse.slicer.org/u/ADeane)\
**Post date:** [January 11, 2022, 12:34am UTC](https://discourse.slicer.org/t/registration-of-head-ct-and-mri-of-sheep/14134/4 "2022-01-11T00:34:47Z")

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Hi Chris,

Unfortunately I have changed jobs and therefore no longer have access to these images.

Best of luck,  
Ashley

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**Author:** ![CASmith](https://avatars.discourse-cdn.com/v4/letter/c/a9a28c/32.png) [@CASmith](https://discourse.slicer.org/u/CASmith)\
**Post date:** [January 11, 2022, 12:56am UTC](https://discourse.slicer.org/t/registration-of-head-ct-and-mri-of-sheep/14134/5 "2022-01-11T00:56:18Z")

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Fair enough.

Thanks Ashley

Chris

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**Author:** ![Matteo\_Donega](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/matteo_donega/32/14914_2.png) [@Matteo\_Donega](https://discourse.slicer.org/u/Matteo_Donega)\
**Post date:** [October 21, 2022, 12:03pm UTC](https://discourse.slicer.org/t/registration-of-head-ct-and-mri-of-sheep/14134/6 "2022-10-21T12:03:46Z")

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Hi Chris @CASmith did you have any luck in finding an MRI/CT of a sheep? I have the same interested and would benefit from this too. Many thanks