# Transform Problem

**URL:** <https://discourse.slicer.org/t/transform-problem/11923>\
**Category:** Support\
**Created:** [June 8, 2020, 10:49am UTC](https://discourse.slicer.org/t/transform-problem/11923 "2020-06-08T10:49:59Z")\
**Posts on this page:** 8\
**Page:** 1

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**Author:** ![Jini](https://avatars.discourse-cdn.com/v4/letter/j/5daacb/32.png) [@Jini](https://discourse.slicer.org/u/Jini)\
**Post date:** [June 8, 2020, 10:49am UTC](https://discourse.slicer.org/t/transform-problem/11923/1 "2020-06-08T10:49:59Z")

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Operating system:  
Slicer version: 4.11.0-2019-11-28  
Expected behavior:  
Actual behavior:

Hello,

**I segmentation two model from two CT-scan**  
1)Sometimes when I transform two models with Finducial markups and General Brainsfit, these models don’t overlap. What else could I do?  
2) when I registered the model with Transform using Harden, the model disappear and you only see one model? Who is the other model? What I can do?  
3) The landmark is does not work, why?

Thank you for your help

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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:** [June 8, 2020, 2:20pm UTC](https://discourse.slicer.org/t/transform-problem/11923/2 "2020-06-08T14:20:31Z")

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> [@Jini](#):
>
> Sometimes when I transform two models with Finducial markups and General Brainsfit, these models don’t overlap. What else could I do?

I’m not sure how fiducial markups registration works in Brainsfit. For landmark registration between two models, I would recommend to use Fiducial registration wizard module (in SlicerIGT extension).

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**Author:** ![Jini](https://avatars.discourse-cdn.com/v4/letter/j/5daacb/32.png) [@Jini](https://discourse.slicer.org/u/Jini)\
**Post date:** [June 9, 2020, 12:17pm UTC](https://discourse.slicer.org/t/transform-problem/11923/3 "2020-06-09T12:17:24Z")

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![Transform_Harden](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/a/0/a0bd2266b3b27fd1d3fbe91d019ad3694d3cd92f.png)  
By transforming, I found that when using the Harden, the second model disappears completely (see picture). That was not the case last year. Why is that jet so?

Thank you very much

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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:** [June 10, 2020, 2:14am UTC](https://discourse.slicer.org/t/transform-problem/11923/4 "2020-06-10T02:14:15Z")

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You are using a very old Slicer version. Please try the latest Slicer Preview Release.

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**Author:** ![Jini](https://avatars.discourse-cdn.com/v4/letter/j/5daacb/32.png) [@Jini](https://discourse.slicer.org/u/Jini)\
**Post date:** [July 30, 2020, 7:57am UTC](https://discourse.slicer.org/t/transform-problem/11923/5 "2020-07-30T07:57:13Z")

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![5.PNG](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/c/7/c753fc983c2b6c046e194fdaed44f02f9b2b4e5f.jpeg)  
Hi,  
how can i move two ct dates so that they are on top of each other?

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:** [July 31, 2020, 3:50am UTC](https://discourse.slicer.org/t/transform-problem/11923/6 "2020-07-31T03:50:57Z")

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You can try “General registration (Elastix)” module (provided by SlicerElastix extension). If that fails for some reason then you can register based on manually defined landmarks using “Landmark registration” module.

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**Author:** ![Jini](https://avatars.discourse-cdn.com/v4/letter/j/5daacb/32.png) [@Jini](https://discourse.slicer.org/u/Jini)\
**Post date:** [August 2, 2020, 8:34am UTC](https://discourse.slicer.org/t/transform-problem/11923/7 "2020-08-02T08:34:56Z")

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the problem with my scan is that the bones are rotated from two measurements (have changed position). I have to turn them properly and then overlap them. How can I turn both bones in the same position?  
And Landmark registration it does not work.

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**Author:** ![pieper](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/pieper/32/8_2.png) [@pieper](https://discourse.slicer.org/u/pieper)\
**Post date:** [August 2, 2020, 2:09pm UTC](https://discourse.slicer.org/t/transform-problem/11923/8 "2020-08-02T14:09:10Z")

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LandmarkRegistration has been fixed in recent preview builds (for the last couple months)