# The calculations used for determining TbTh/ TbSp/ & Tb.N in BoneMorphometry extension?

**URL:** <https://discourse.slicer.org/t/the-calculations-used-for-determining-tbth-tbsp-tb-n-in-bonemorphometry-extension/48416>\
**Category:** Support\
**Created:** [October 6, 2026, 4:14pm UTC](https://discourse.slicer.org/t/the-calculations-used-for-determining-tbth-tbsp-tb-n-in-bonemorphometry-extension/48416 "2026-10-06T16:14:41Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![danielleadams098](https://avatars.discourse-cdn.com/v4/letter/d/f14d63/32.png) [@danielleadams098](https://discourse.slicer.org/u/danielleadams098)\
**Post date:** [October 6, 2026, 4:14pm UTC](https://discourse.slicer.org/t/the-calculations-used-for-determining-tbth-tbsp-tb-n-in-bonemorphometry-extension/48416/1 "2026-10-06T16:14:41Z")

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Operating system: Mac OS 26.2  
Slicer version: 5.12.4  
Expected behavior:  
Actual behavior:

I am looking for documentation on how exactly the BoneMorphometry extension measures trabecular thickness, trabecular separation, and trabecular number. A couple months ago, I found a page on BoneTexture extension github that explained how it counted the pixels that made up the boundary of the bone (notes below)… which seemed to be a different method than that used in Fiji software - where for each voxel, the distance to the bone interface is measured and it creates a sphere that represents the trabecular thickness in that area.

It seems that the BoneTexture extension documentation has been rearranged recently and I cannot locate the specific calculations of these trabecular metrics. Does anyone have that information? or can tell me where it is located now?

 ![IMG_6821](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/d/8/d8a2089d011e17bf0cc7ad513b9f92897e5c484b.jpeg)