[Rtk-users] Hounsfield Unit Conversion - New User

[Simon Rit]

Hi,
To convert to HU, you need to measure a phantom with water and air and to
apply the formula for HU conversion (see wikipedia
<https://en.wikipedia.org/wiki/Hounsfield_scale>). Note that due to scatter
in (Elekta) cone-beam CTs, you will have difficulties in doing this
conversion due to strong artifacts.
The --wpc coefficients can allow you to apply the slope of this formula but
the intercept must be subtracted after reconstruction. We illustrate here
<http://wiki.openrtk.org/index.php/WaterPreCorrection> how to use wpc.
Good luck,
Simon

On Mon, Feb 19, 2018 at 1:01 AM, muhammad waqar <muhammad.s.waqar at gmail.com>
wrote:

> Hello all,
>
> I'm a new user to ITK/RTK and I'm having a few issues:
>
> Following the ElektaReconstruction steps on the wiki, I was able to
> reconstruct my scan. However, the window and level are still in attenuation
> coefficients. How can I convert my scan to Hounsfield Units?
>
> Whenever I put in any value for --wpc in RTKFDK (I've tried values from
> 0.015-150) my recon results in a 'blank' as is attached below.
>
> Any help in resolving this would be great.
>
> Kindly,
> -Waqar Muhammad
> Carleton University
>
>
> ​
> ᐧ
>
> _______________________________________________
> Rtk-users mailing list
> Rtk-users at public.kitware.com
> https://public.kitware.com/mailman/listinfo/rtk-users
>
>
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