# Different result using same transformation

**URL:** <https://discourse.slicer.org/t/different-result-using-same-transformation/26038>\
**Category:** Support\
**Tags:** registration\
**Created:** [November 2, 2022, 2:44pm UTC](https://discourse.slicer.org/t/different-result-using-same-transformation/26038 "2022-11-02T14:44:53Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![alan6690](https://avatars.discourse-cdn.com/v4/letter/a/bc79bd/32.png) [@alan6690](https://discourse.slicer.org/u/alan6690)\
**Post date:** [November 2, 2022, 2:44pm UTC](https://discourse.slicer.org/t/different-result-using-same-transformation/26038/1 "2022-11-02T14:44:53Z")

</div>

I have registered two lung CT images using elastix deformable registration module and saved the transformation matrix as a h5 file. I realize if I apply the transformation matrix into an identical copy of the same moving volume, the first and second deformed volumns would have some difference. Desipte the minimal differences, I am curious what causes such deviation. Is there some loss of matrix data if I save the transformation into an external file?