# Volume calculations are inconsistent on Bone CTs
**URL:** https://discourse.slicer.org/t/volume-calculations-are-inconsistent-on-bone-cts/45919
**Category:** Support
**Created:** [January 26, 2026, 10:35am UTC](https://discourse.slicer.org/t/volume-calculations-are-inconsistent-on-bone-cts/45919 "2026-01-26T10:35:31Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@Nat](https://discourse.slicer.org/u/Nat)
#### Post date: [January 26, 2026, 10:35am UTC](https://discourse.slicer.org/t/volume-calculations-are-inconsistent-on-bone-cts/45919/1 "2026-01-26T10:35:31Z")
I am using slicer to separate cortical and trabecular bone in CT scans from morphosource. I use the threshold effect to first identify the cortical bone then use the wrap solidify tool to creat a segment with all bone volume. Then I go to quantification → segment statistics to obtain the volumes in mm^3.
However, on some bone scans the total volume comes out at 5700 mm^3 and then another scan of a bone the same length will give a volume of only 1800.
Any ideas of what I am doing wrong? The segments are cleaned up to ensure no background measurement. The ratio between the two is always roughly correct so i do nbot think it is a measurement error but rather a scaling one.
Thanks in advance!
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### Author:  [@muratmaga](https://discourse.slicer.org/u/muratmaga)
#### Post date: [January 26, 2026, 6:21pm UTC](https://discourse.slicer.org/t/volume-calculations-are-inconsistent-on-bone-cts/45919/2 "2026-01-26T18:21:14Z")
> [@Nat](#):
>
> then another scan of a bone
Is this the same species?
> [@Nat](#):
>
> The ratio between the two is always roughly correct so i do nbot think it is a measurement error but rather a scaling one
Make sure you import the data with the correct scale.