# Shift scale image filter

**URL:** <https://discourse.slicer.org/t/shift-scale-image-filter/29178>\
**Category:** Support\
**Tags:** normalisation\
**Created:** [April 27, 2023, 8:05pm UTC](https://discourse.slicer.org/t/shift-scale-image-filter/29178 "2023-04-27T20:05:32Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![mahmood](https://avatars.discourse-cdn.com/v4/letter/m/d07c76/32.png) [@mahmood](https://discourse.slicer.org/u/mahmood)\
**Post date:** [April 27, 2023, 8:05pm UTC](https://discourse.slicer.org/t/shift-scale-image-filter/29178/1 "2023-04-27T20:05:32Z")

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Sorry, I have a question?  
What’s the shift scale image filter in 3dslicer?  
Is that (mu +/- 3sigma)?  
If yes, what numbers should be put in shift and scale values to make the above formula?  
And what’s shift and scale in this module?  
I want to normalize CT images before radiomics features extraction.  
Thanks a lot.