Hi Simon,
thank you very much for the quick reply.
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.
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:
itk::MemoryAllocationError (0x7fbb04000940)
Location: "unknown"
File:
/home/vincent/IPTools/InsightToolkit-5.0.1/Modules/Core/Common/include/itkImportImageContainer.hxx
Line: 199
Description: Failed to allocate memory for image.
The command line I used was
rtkfdk -p . -r projections.mhd --hardware cuda -o reconstruction.mhd -g
rt900.xml --spacing 0.23 --dimension 2000 --divisions 4
I am using a NVIDIA GEForce-GTX 1080 TI with 11 Go of RAM and able to
reconstruct a 1024*1024*1024 volume.
Could you please help me finding what I did wrong ?
Thank you again for your invaluable help,
kindest 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 <v...@xris.eu
<mailto:v...@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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