# Procrustes alignment 

**URL:** <https://discourse.slicer.org/t/procrustes-alignment/3144>\
**Category:** SlicerSALT\
**Created:** [June 12, 2018, 4:29am UTC](https://discourse.slicer.org/t/procrustes-alignment/3144 "2018-06-12T04:29:26Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Pugliese](https://avatars.discourse-cdn.com/v4/letter/p/87869e/32.png) [@Pugliese](https://discourse.slicer.org/u/Pugliese)\
**Post date:** [June 12, 2018, 4:29am UTC](https://discourse.slicer.org/t/procrustes-alignment/3144/1 "2018-06-12T04:29:26Z")

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Hi, Beatriz and Martin

I was following the tutorial, and I noticed that the rigid-body Procrustes alignment (only translation and/or a rotation) can be used.

I was just wondering how the size would be removed (rescaling step) for a pure shape analysis.

Thanks for the great and very useful tool.

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**Author:** ![styner](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/styner/32/1024_2.png) [@styner](https://discourse.slicer.org/u/styner)\
**Post date:** [June 13, 2018, 2:07pm UTC](https://discourse.slicer.org/t/procrustes-alignment/3144/2 "2018-06-13T14:07:19Z")

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Hi Fernando  
The SlicerSALT toolkit currently does not allow for “pure” shape analysis, or size-free shape analysis. This based on the main driver for SlicerSALT being biomedical applications, where size-free shape would be extremly hard to interprete. In the code, the procrustes scale normalization is actually being computed, it’s just not applied. As a workaround, you could edit the code yourself and recompile (this is not optimal, I understand).

Martin

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**Author:** ![Pugliese](https://avatars.discourse-cdn.com/v4/letter/p/87869e/32.png) [@Pugliese](https://discourse.slicer.org/u/Pugliese)\
**Post date:** [July 8, 2018, 3:02am UTC](https://discourse.slicer.org/t/procrustes-alignment/3144/3 "2018-07-08T03:02:58Z")

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Thank you very much for the feedback.