[Rtk-users] How to fdk reconstruction properly

[Simon Rit]

Hi,
Input projections are selected with a path (-p) and a regular expression
(-r) which are passed to an itk::RegularExpressionSeriesFileNames, see here
<https://github.com/SimonRit/RTK/blob/master/include/rtkGgoFunctions.h#L100-L174>
.
Your sinogram.mha file is 2D and RTK is meant for 3D. There are tricks to
reconstruct in 2D but you need to modify your input, see e.g. here
<http://wiki.openrtk.org/index.php/FanBeam> (with our old wrappings but
that should not be difficult to convert). Then the y dimension should be
the second coordinate, it's the first in the data you sent.
I would suggest to check what RTK sinograms look like from the wiki
<http://wiki.openrtk.org> examples and adapt your input accordingly.
Best regards,
Simon

On Tue, Jun 2, 2020 at 6:17 AM 나윤호 <yoonho94.na at gmail.com> wrote:

> Hi, I've been asking many questions recently, and I think I'm almost there.
>
> finally I could get an output image, but It is not good at all.
>
> The reconstructed image should be a round image but it doesn't look round.
>
> I uploaded my code on github <https://github.com/yolkandwhite/fdk> in
> python language, but for the actual computation I just used rtkfdk in C++
>
> what I'm guessing is in the command line script setting the dimension was
> wrong.
>
> I have explained the situations in the code with annotations and markdowns
> and few screenshots.
>
> how can I fix it??
>
> and I have another question.
>
> in the rtkfdk 2D example
> <http://wiki.openrtk.org/index.php/RTK/Scripts/FDK>,
>
> rtkfdk -p . -r projections.mha -o fdk.mha -g geometry.xml --spacing 2 --dimension 256,1,256
>
> I don't understand what -p and . and -r is.
>
> I cannot find one in rtkfdk.ggo.
>
> Best regards.
>
> Yoonho.
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