# How to troubleshoot measurement error 

**URL:** <https://discourse.slicer.org/t/how-to-troubleshoot-measurement-error/40874>\
**Category:** Support\
**Tags:** segmentation, segmentations, segment-editor\
**Created:** [December 27, 2024, 9:26pm UTC](https://discourse.slicer.org/t/how-to-troubleshoot-measurement-error/40874 "2024-12-27T21:26:50Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![PitaChib](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/pitachib/32/78512_2.png) [@PitaChib](https://discourse.slicer.org/u/PitaChib)\
**Post date:** [December 27, 2024, 9:26pm UTC](https://discourse.slicer.org/t/how-to-troubleshoot-measurement-error/40874/1 "2024-12-27T21:26:50Z")

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So I’m measuring a bunch of basic measurements for a group of skulls, and I always follow the same protocol of getting an volume from imageStack.  
One of the current one I’m doing (resolution is 29.99 um), I exported from ImageStack as follows:

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/6/e/6e9ad26cb17c13c3596c200e63fb626f33687e72.png)

But when I went to measure condylobasal length for this specimen it’s averaging around 231mm

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/e/9/e9266bf42510de7bd863ca687d3442d43c83fd66.png)  
which is not possible given my other samples are averaging 23mm. I think it’s a scaling issue I might’ve mistaken, but I don’t know where to start troubleshooting. Any suggestions appreciated! Thanks.

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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:** [December 27, 2024, 9:30pm UTC](https://discourse.slicer.org/t/how-to-troubleshoot-measurement-error/40874/2 "2024-12-27T21:30:30Z")

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> [@PitaChib](#):
>
> One of the current one I’m doing (resolution is 29.99 um), I exported from ImageStack

The screenshot shows that you entered 0.299 mm = 299 micrometer pixel size, so all the linear measurement results will be 10x larger than the actual size.

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**Author:** ![PitaChib](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/pitachib/32/78512_2.png) [@PitaChib](https://discourse.slicer.org/u/PitaChib)\
**Post date:** [December 27, 2024, 10:00pm UTC](https://discourse.slicer.org/t/how-to-troubleshoot-measurement-error/40874/3 "2024-12-27T22:00:59Z")

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Thanks! I realized that immediately after I posted and I apologize for the brainfog. Is the only way to reverse this to change from ImageStack? I have a batch need to rescale it’d be nice not having to do that again.  
With lots of gratitude.

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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:** [December 27, 2024, 11:54pm UTC](https://discourse.slicer.org/t/how-to-troubleshoot-measurement-error/40874/4 "2024-12-27T23:54:42Z")

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You can change the image spacing in Volumes module / Volume information section.