Hi Simon,
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.
I'll investigate further tomorrow.
Thank you again for your help,
Vincent
On 2020-02-11 8:08 p.m., Simon Rit wrote:
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).
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).
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?
On Tue, Feb 11, 2020 at 7:31 PM vincent <[email protected]
<mailto:[email protected]>> wrote:
Hi Simon,
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.
kind regards,
Vincent
On 11.02.20 17:36, Simon Rit wrote:
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 <[email protected]
<mailto:[email protected]>> 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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