[Rtk-users] Can i force the voxel values of volume be constructed to be positive?

[Simon Rit]

Hi,
No there is no option to force the output volume to 0. This is not the same
as sart where you might want to do it during the iterations. In the FDK
case, it's only post-processing so there is not really a reason to put it
in rtkfdk.
The nonneg option is the minimum value of the intensity that you allow the
Boellaard algorithm to reach after scatter correction. This does not
prevent negative values in the volume because the ramp filter might create
negative values from positive projections.
Simon

On Thu, Aug 6, 2015 at 2:00 AM, Guangming Zang <guangming.zang at kaust.edu.sa>
wrote:

> Dear Simon and RTK community,
> considering in rtksart ,we have --positivity to force the reconstructed
> volume values to be positive(i guess, not tested yet), i was wondering if
> we have any options and commands to have the same effect in algorithms fdk
> and admmtv since --positivity can not be found?
> the Boellaard scatter correction: --nonneg  is what i am looking for?
> Thanks in advance.
> Guangming
> *Guangming Zang (Alex)*
> *King Abdullah University of Science and Technology(KAUST)*
> *University of Chinese Academy of Sciences(UCAS)*
>
>
>
>
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