# Change spatial calibration

**URL:** <https://discourse.slicer.org/t/change-spatial-calibration/13605>\
**Category:** Support\
**Created:** [September 22, 2020, 12:13pm UTC](https://discourse.slicer.org/t/change-spatial-calibration/13605 "2020-09-22T12:13:58Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![ricounet67](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/ricounet67/32/8244_2.png) [@ricounet67](https://discourse.slicer.org/u/ricounet67)\
**Post date:** [September 22, 2020, 12:13pm UTC](https://discourse.slicer.org/t/change-spatial-calibration/13605/1 "2020-09-22T12:13:58Z")

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I would like to know if it is possible to change the spatial calibration of a volume in Slicer.  
I import a tiff stack from a tomography reconstruction made with TomoJ (in ImageJ). I didn’t found the way to set the voxel size.  
Thank you

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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:** [September 22, 2020, 1:00pm UTC](https://discourse.slicer.org/t/change-spatial-calibration/13605/2 "2020-09-22T13:00:43Z")

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This documentation section explains how you can import and calibrate an image stack: [https://slicer.readthedocs.io/en/latest/user\_guide/modules/volumes.html?highlight=jpg#load-a-series-of-png-jpeg-or-tiff-images-as-volume](https://slicer.readthedocs.io/en/latest/user_guide/modules/volumes.html?highlight=jpg#load-a-series-of-png-jpeg-or-tiff-images-as-volume)

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**Author:** ![ricounet67](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/ricounet67/32/8244_2.png) [@ricounet67](https://discourse.slicer.org/u/ricounet67)\
**Post date:** [September 25, 2020, 6:17am UTC](https://discourse.slicer.org/t/change-spatial-calibration/13605/3 "2020-09-25T06:17:32Z")

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Thank you, as I understand this step is at the importation of the tiff stack. But one the model is generated and saved into a VTK file is it still possible to change the spatial calibration?

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**Author:** ![Andinet\_Enquobahrie](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/andinet_enquobahrie/32/75_2.png) [@Andinet\_Enquobahrie](https://discourse.slicer.org/u/Andinet_Enquobahrie)\
**Post date:** [September 25, 2020, 12:47pm UTC](https://discourse.slicer.org/t/change-spatial-calibration/13605/4 "2020-09-25T12:47:50Z")

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Yes, you can use the Volume Information Panel to modify the image properties ( you just have to be careful when you do this as this will affect all your subsequent quantitative computations)

> **[Volumes — 3D Slicer documentation](https://slicer.readthedocs.io/en/latest/user_guide/modules/volumes.html#panels-and-their-use)**

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<div class="post-metadata">

**Author:** ![ricounet67](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/ricounet67/32/8244_2.png) [@ricounet67](https://discourse.slicer.org/u/ricounet67)\
**Post date:** [September 25, 2020, 2:42pm UTC](https://discourse.slicer.org/t/change-spatial-calibration/13605/5 "2020-09-25T14:42:17Z")

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It doesn’t seems to work with a model.  
When I open my VTK file, it is considered as a model and I don’t have the possibility to change the scale.

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<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:** [September 25, 2020, 3:44pm UTC](https://discourse.slicer.org/t/change-spatial-calibration/13605/6 "2020-09-25T15:44:07Z")

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You can easily scale models using Surface Toolbox module.

If you want to transform volumes and images together then it is easier to use Transforms module: create transform, set scaling factors in the diagonal values in the transformation matrix, apply transform to all nodes (models, volumes, markups, segmentations, …), then harden transform on all nodes.