# Loss of contours after Applying Rotation

**URL:** <https://discourse.slicer.org/t/loss-of-contours-after-applying-rotation/18616>\
**Category:** Support\
**Tags:** registration, slicerrt\
**Created:** [July 10, 2021, 1:53pm UTC](https://discourse.slicer.org/t/loss-of-contours-after-applying-rotation/18616 "2021-07-10T13:53:58Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![MichaelCHL](https://avatars.discourse-cdn.com/v4/letter/m/919ad9/32.png) [@MichaelCHL](https://discourse.slicer.org/u/MichaelCHL)\
**Post date:** [July 10, 2021, 1:53pm UTC](https://discourse.slicer.org/t/loss-of-contours-after-applying-rotation/18616/1 "2021-07-10T13:53:58Z")

</div>

Hi all, I’ve applied transformation (rotation about the red target in my phantom) to both the CT scans and the contours (RT strucutures), hardened it and export it to DICOM

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/5/7/578afd672a6667c115bb307dbfb6bad9b7a0cdb6.png)

After the rotation, some of the contours are missing, but the CT scans are not affected.

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/4/3/432d288a4e5a0ec45c2ec82d6d9fda39219137e7.png)

Does anybody have clues about what the problem is?

Many thanks!  
Michael

---

<div class="post-metadata">

**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 12, 2021, 4:20am UTC](https://discourse.slicer.org/t/loss-of-contours-after-applying-rotation/18616/2 "2021-07-12T04:20:00Z")

</div>

Can you share the scene that is saved as .mrb file, before you hardened the transform? Use an anonymized data set or - even better - a publicly available sample data set.

---

<div class="post-metadata">

**Author:** ![MichaelCHL](https://avatars.discourse-cdn.com/v4/letter/m/919ad9/32.png) [@MichaelCHL](https://discourse.slicer.org/u/MichaelCHL)\
**Post date:** [July 12, 2021, 3:32pm UTC](https://discourse.slicer.org/t/loss-of-contours-after-applying-rotation/18616/3 "2021-07-12T15:32:20Z")

</div>

Hi Andras, thanks for the reply.

I am now using Eclipse to register the contours to the rotated CT scans so this problem has been solved.