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<p>Hi Simon,</p>
<p>thank you very much for the quick reply.</p>
<p>I have some leads about my problem, I'll post the solution if I
find it. In the meantime, I tested the division option that went
under my radar, I am afraid.</p>
<p>I am certainly doing something wrong or not understanding the
mechanism of that option. From what I understood from the code,
the streamer will split the volume to be reconstructed in
<dimensions> subset along the y axis, which is indeed
exactly what I am looking for. When I tried to use it, however, I
got an error message, hereafter reproduced:</p>
<p>itk::MemoryAllocationError (0x7fbb04000940)<br>
Location: "unknown" <br>
File:
/home/vincent/IPTools/InsightToolkit-5.0.1/Modules/Core/Common/include/itkImportImageContainer.hxx<br>
Line: 199<br>
Description: Failed to allocate memory for image.<br>
</p>
<p>The command line I used was</p>
<p>rtkfdk -p . -r projections.mhd --hardware cuda -o
reconstruction.mhd -g rt900.xml --spacing 0.23 --dimension 2000
--divisions 4</p>
<p>I am using a NVIDIA GEForce-GTX 1080 TI with 11 Go of RAM and
able to reconstruct a 1024*1024*1024 volume.</p>
<p>Could you please help me finding what I did wrong ?</p>
<p>Thank you again for your invaluable help,</p>
<p>kindest regards,</p>
<p>Vincent<br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 11.02.20 17:36, Simon Rit wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAF0oig3--6NpM3Oe0BAhkdGBek-u1cKKp1_7w7LAX+AjCvx20g@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="ltr">
<div>Hi Vincent,</div>
<div>There is a way to do such a thing in rtkfdk with the
--divisions option, see code <a
href="https://github.com/SimonRit/RTK/blob/master/applications/rtkfdk/rtkfdk.cxx#L190-L196"
moz-do-not-send="true">here</a>. <br>
</div>
<div>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?</div>
<div>Simon</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Tue, Feb 11, 2020 at 4:21
PM vincent <<a href="mailto:vl@xris.eu"
moz-do-not-send="true">vl@xris.eu</a>> wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hello
RTK community,<br>
<br>
I am afraid that my question might not be directly related to
the <br>
excellent implementation we are all using, but it might still
be <br>
interesting for some of you.<br>
<br>
I have a stack of 1500 projections of size 2048*2048. I
obviously can't <br>
reconstruct the full resolution volume on my graphics card, as
it is too <br>
big. So my solution was to split the sinogram into N parts,
for which <br>
each reconstructed volume would fit in my GPU memory and then
reassemble <br>
them. I did a test with a 700*820*900 sinogram, that I cut in
two parts <br>
of 700*410(+a small overlap)*900.<br>
<br>
While the reconstruction of the whole volume was acceptable, I
got a <br>
weird issue with the split ones: the one corresponding to the
top of the <br>
image is also ok, but the bottom one is very blurry. The
three images <br>
can be found at the following links:<br>
<br>
<a href="https://ibb.co/vLk9ZhQ" rel="noreferrer"
target="_blank" moz-do-not-send="true">https://ibb.co/vLk9ZhQ</a><br>
<a href="https://ibb.co/m4pm0LT" rel="noreferrer"
target="_blank" moz-do-not-send="true">https://ibb.co/m4pm0LT</a><br>
<a href="https://ibb.co/Jyf1yKM" rel="noreferrer"
target="_blank" moz-do-not-send="true">https://ibb.co/Jyf1yKM</a><br>
<br>
I used the same calibration parameters for the three
reconstruction. I <br>
visually checked the split sinograms and they looked fine.<br>
<br>
<br>
Any insight will be much appreciated !<br>
<br>
<br>
Thanks in advance,<br>
<br>
kindest regards,<br>
<br>
Vincent<br>
<br>
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</blockquote>
</div>
</blockquote>
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