# Voxel size scale

**URL:** <https://discourse.slicer.org/t/voxel-size-scale/17694>\
**Category:** Support\
**Created:** [May 19, 2021, 12:31pm UTC](https://discourse.slicer.org/t/voxel-size-scale/17694 "2021-05-19T12:31:00Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![granizado](https://avatars.discourse-cdn.com/v4/letter/g/9f8e36/32.png) [@granizado](https://discourse.slicer.org/u/granizado)\
**Post date:** [May 19, 2021, 12:31pm UTC](https://discourse.slicer.org/t/voxel-size-scale/17694/1 "2021-05-19T12:31:01Z")

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I completed a segmentation and in the final steps when I added a scale bar I realised that the dimensions are far too big than the real ones which makes a problem with segment statistics as well. I have a voxel resolution of 72 μm so I changed the image spacing accordingly. The problem is that the image has changed but the size of segmentation stays the same. When I change it in „Specify geometry” in Segment Editor it completely lost all shapes. I would be grateful for any tip how to solve it.

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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:** [May 21, 2021, 5:41pm UTC](https://discourse.slicer.org/t/voxel-size-scale/17694/2 "2021-05-21T17:41:11Z")

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You can transform the segmentation by [applying and hardening a transform](https://slicer.readthedocs.io/en/latest/user_guide/modules/transforms.html#apply-transform-to-a-node). You need to put the 3 relative scaling factors in the diagonal of the transformation matrix.

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**Author:** ![Philipp\_Maintz](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/philipp_maintz/32/11527_2.png) [@Philipp\_Maintz](https://discourse.slicer.org/u/Philipp_Maintz)\
**Post date:** [July 8, 2021, 3:35pm UTC](https://discourse.slicer.org/t/voxel-size-scale/17694/3 "2021-07-08T15:35:28Z")

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I have the same issue what is the module to do that?

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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 8, 2021, 3:37pm UTC](https://discourse.slicer.org/t/voxel-size-scale/17694/4 "2021-07-08T15:37:39Z")

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See the link above, which takes you to the documentation of the **Transforms** module. You can use this module to apply and harden transforms.