# Automatic registration of segmentation
**URL:** https://discourse.slicer.org/t/automatic-registration-of-segmentation/22045
**Category:** Support
**Tags:** registration, segmentation
**Created:** [February 18, 2022, 1:52pm UTC](https://discourse.slicer.org/t/automatic-registration-of-segmentation/22045 "2022-02-18T13:52:41Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@Cam\_Arnt](https://discourse.slicer.org/u/Cam_Arnt)
#### Post date: [February 18, 2022, 1:52pm UTC](https://discourse.slicer.org/t/automatic-registration-of-segmentation/22045/1 "2022-02-18T13:52:41Z")
Hi everyone,
I’ve got a problem with the automatic registration. I will explain you :
I’ve achieved the segmentation of bones on CT-scan images and catilages on MRI images. I would like to register the segmentation with an automatic way. Currently, I’ve just done it manually, and when I try to achieve the registration, only the images are registered.
If everyone can help me, I would be grateful.
Have a good day !
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### Author:  [@lassoan](https://discourse.slicer.org/u/lassoan)
#### Post date: [February 18, 2022, 4:17pm UTC](https://discourse.slicer.org/t/automatic-registration-of-segmentation/22045/2 "2022-02-18T16:17:49Z")
Registration modules can also compute a transform. You can then [apply the computed transform to the segmentation](https://slicer.readthedocs.io/en/latest/user_guide/modules/transforms.html#apply-transform-to-a-node).
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### Author:  [@Cam\_Arnt](https://discourse.slicer.org/u/Cam_Arnt)
#### Post date: [February 22, 2022, 7:39am UTC](https://discourse.slicer.org/t/automatic-registration-of-segmentation/22045/3 "2022-02-22T07:39:22Z")
I’ve done a new linear transform with brain registration module with
- fixed image: scan (where there is the bone segmentation)
- moving image: MRI (where there is the menisci segmentation)
it created the output image 4 and the linear transform
- I’ve applied the new transform to the menisci segmentation: it worked
but bones are linked to the fixed image but still turned in the wrong way as you can see below, and that I don’t understand.
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### Author:  [@lassoan](https://discourse.slicer.org/u/lassoan)
#### Post date: [February 22, 2022, 1:48pm UTC](https://discourse.slicer.org/t/automatic-registration-of-segmentation/22045/4 "2022-02-22T13:48:35Z")
The computed transform must be applied to the moving image. You can switch up the fixed and moving image if you want to transform the other image.
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### Author:  [@Cam\_Arnt](https://discourse.slicer.org/u/Cam_Arnt)
#### Post date: [February 22, 2022, 4:15pm UTC](https://discourse.slicer.org/t/automatic-registration-of-segmentation/22045/5 "2022-02-22T16:15:22Z")
Thanks for all! My problem was on a registration parameter and not on my segmentation. However, your explication of the transform matrix was very helpful.