[Rtk-users] Blurred piece-wise reconstruction

[Simon Rit]

Hi Vincent,
There is a way to do such a thing in rtkfdk with the --divisions option,
see code here
<https://github.com/SimonRit/RTK/blob/master/applications/rtkfdk/rtkfdk.cxx#L190-L196>.

I also don't really understand either what's going on in your bottom
reconstruction, it seems to be a geometric problem. Have you checked an
axial slice?
Simon

On Tue, Feb 11, 2020 at 4:21 PM vincent <vl at xris.eu> wrote:

> Hello RTK community,
>
> I am afraid that my question might not be directly related to the
> excellent implementation we are all using, but it might still be
> interesting for some of you.
>
> I have a stack of 1500 projections of size 2048*2048.  I obviously can't
> reconstruct the full resolution volume on my graphics card, as it is too
> big.  So my solution was to split the sinogram into N parts, for which
> each reconstructed volume would fit in my GPU memory and then reassemble
> them.  I did a test with a 700*820*900 sinogram, that I cut in two parts
> of 700*410(+a small overlap)*900.
>
> While the reconstruction of the whole volume was acceptable, I got a
> weird issue with the split ones: the one corresponding to the top of the
> image is also ok, but the bottom one is very blurry.  The three images
> can be found at the following links:
>
> https://ibb.co/vLk9ZhQ
> https://ibb.co/m4pm0LT
> https://ibb.co/Jyf1yKM
>
> I used the same calibration parameters for the three reconstruction.  I
> visually checked the split sinograms and they looked fine.
>
>
> Any insight will be much appreciated !
>
>
> Thanks in advance,
>
> kindest regards,
>
> Vincent
>
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