# Bone Mineral Density (BMD) measurement method

**URL:** <https://discourse.slicer.org/t/bone-mineral-density-bmd-measurement-method/11010>\
**Category:** Support\
**Created:** [April 6, 2020, 8:23am UTC](https://discourse.slicer.org/t/bone-mineral-density-bmd-measurement-method/11010 "2020-04-06T08:23:51Z")\
**Posts on this page:** 1\
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**Author:** ![manjula](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/manjula/32/80981_2.png) [@manjula](https://discourse.slicer.org/u/manjula)\
**Post date:** [April 6, 2020, 3:46pm UTC](https://discourse.slicer.org/t/bone-mineral-density-bmd-measurement-method/11010/3 "2020-04-06T15:46:19Z")

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Thank you for your kind reply as always.

The one we used is [Burker](https://medicine.temple.edu/sites/medicine/files/files/ct_analyzer.pdf).

The method it describe was way too complex for me but the way it was done is very simple.

You segment out the 3 phantoms. then calculate the mean values. ( i mean automatically it is given just like in the segment statistics module)

Then we put the 3 values to the graph and calculate the equation for line with libreCalc,

 ![Screenshot from 2020-04-06 17-43-24](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/2/4/244a4c54a34bc5f1ce11502d889c0bff1c08151f.png)

So from the trend-line we can calculate the density of any know HU value.

As you can see the difference between 3D slicer and the burker is very small i guess…

> [@lassoan](#):
>
> 3 measurement points are very few. At least for initial exploration, I would add at least 5-10 points, just to have an idea about shape and amount of noise in the curve. It is highly unlikely that the calibration curve would be a line, so fitting a line to 3 points is a potential source of error.

Do you mean we take few more segments from each the 3 phantoms or we should use more phantoms with different densities ???

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