# 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\
**Showing post:** 4

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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:** [April 6, 2020, 5:56pm UTC](https://discourse.slicer.org/t/bone-mineral-density-bmd-measurement-method/11010/4 "2020-04-06T17:56:13Z")

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> [@manjula](#):
>
> The method it describe was way too complex for me but the way it was done is very simple.

GelDosimetry allows you to automatically compute the curve on many samples and also evaluates the error and how it is distributed in the image (error may be different in different regions of the phantom). These additional features may also mean more complexity - most importantly, you need a ground truth image of the phantom, which can come from a calibration CT scanner or you can construct it manually.

> [@manjula](#):
>
> Do you mean we take few more segments from each the 3 phantoms or we should use more phantoms with different densities ???

I would recommend to use a phantom with 5-10 different densities to get an idea of the shape of the intensity calibration function. That will help you to decide if line fit is sufficient or you need a polynomial fit.

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