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<p>Hi Simon,</p>
<p>yes, I used both in my command line. I have 64 Go RAM on the
machine, so that shouldn't be the issue. For the sake of
completeness, I also tried the subset option in combination with
the divisions option, going as low as 1, but to no avail.</p>
<p>I'll investigate further tomorrow.</p>
<p>Thank you again for your help,</p>
<p>Vincent<br>
</p>
<div class="moz-cite-prefix">On 2020-02-11 8:08 p.m., Simon Rit
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAF0oig3G_QS-=X0Nqf8J3HfrozxSF8ENvqOUxUE2nQ93gyPSHw@mail.gmail.com">
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<div>Have you tried the combination of both? To be clear,
--divisions acts on the reconstructed volume so it should be
~7 Go with the "--divisions 4" option (instead of
2000*2000*2000*4/1024/1024/1024=29.8 Go otherwise).</div>
<div>The --lowmem option acts on the projections and you have
250 Mo (instead of 2048*2048*1500*4/1024/1024/1024=23.4 Go
otherwise).</div>
<div>The message "Failed to allocate memory for image" seems to
be a CPU memory issue. Are you sure you have about 10 Go
available to run this reconstruction?<br>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Tue, Feb 11, 2020 at 7:31
PM vincent <<a href="mailto:vl@xris.eu"
moz-do-not-send="true">vl@xris.eu</a>> wrote:<br>
</div>
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0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div bgcolor="#FFFFFF">
<p>Hi Simon, <br>
</p>
<p>I am afraid I forgot to mention something in my last
email. I tried to use the lowmem option, as you suggested
a while ago in the list for the same problem, but I am
afraid I am still getting the same error.</p>
<p>kind regards,</p>
<p>Vincent<br>
</p>
<div>On 11.02.20 17:36, Simon Rit wrote:<br>
</div>
<blockquote type="cite">
<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"
target="_blank" 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"
target="_blank" 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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