[Rtk-users] Frames in rtkfourdfdk

[Simon Rit]

Hi,
Quickly checking the code, the reason is pretty simple: rtkfourdfdk uses
rtkSelectOneProjectionPerCycleImageFilter.h, which selects the closest
projection to a given phase in each respiratory cycle. So setting the
number of frames will not increase the number of frames per phase (and,
therefore, blur). I think it's quite a common way of sorting in the
literature, see for example [Sonke et al, Med Phys, 2005]: "For each
breathing cycle, the projection closest to each breathing phase is
selected."
The reason is explained in [Dietrich et al, PMB, 2006] or in a simulation
work <http://www.creatis.insa-lyon.fr/~srit/biblio/rit2007.pdf> I did in
the past.
Simon

On Tue, Aug 23, 2016 at 4:43 PM, K.Niepel <K.Niepel at physik.uni-muenchen.de>
wrote:

> Hello there,
>
> I am currently trying out the rtkfourdfdk application on a moving phantom
> data set with the number of phase bins varying from 15 down to one.
> However, there is no noticeable blurring for lower fewer bins as with the
> 3D rtkfdk app  - actually, the first frame seems to be exactly the same for
> any total number of frames.
>
> The only setting i changed is the --frames argument. Am I missing
> something?
>
> Thanks in advance,
> Kati
>
>
>
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