[Rtk-users] Varian reconstruction question

[Chao Wu]

Hi Dave,

Without the lowmem flag all projection images may be loaded into graphics
memory at once causing an out-of-memory issues.
You can also check this thread:
http://public.kitware.com/pipermail/rtk-users/2015-June/000510.html

Regards,
Chao

2015-10-14 22:27 GMT+02:00 sco user <scouser27 at gmail.com>:

> Hi
>
> I'm a new user to RTK.
> I've been able to perform reconstructions of the Catphan and my own copies
> of Varian CBCT images with some success. I enabled the CUDA flags when
> making RTK so as to take advantage of the capabilities of my GPU.
>
> When I use --hardware="cuda" with the rtkfdk application, I have found
> that I must specify the lowmem option in order to get the reconstruction to
> run successfully. If I don't use lowmem, I get the following error:
>
> ####
> Reconstructing and writing...
> /home/dave/RTK/utilities/ITKCudaCommon/include/itkCudaDataManager.h:55 @
> unknown : Cuda Error : out of memory
>
> ExceptionObject caught with writer->Update() in file
> /home/dave/RTK/applications/rtkfdk/rtkfdk.cxx line 238
>
> itk::ExceptionObject (0x18e3460)
> Location: "unknown"
> File: /home/dave/RTK/utilities/ITKCudaCommon/include/itkCudaDataManager.h
> Line: 55
> Description: Cuda Error : out of memory
> ####
>
> I take from this that I'm out of memory on the GPU. Is that correct? The
> GPU has 2Gb of memory. Can anyone tell me what the minimum memory should be
> in order to get a typical Varian reconstruction to run without the lowmem
> option.
>
> On a side note, I know that the cuda option is working because it's a lot
> quicker than hardware="cpu", despite only having 96 cuda cores.
>
>
> Another question I'd like to ask is if anyone can shed some light on
> useful values for I-zero, wpc, scatter etc.
>
> With thanks in advance,
> Dave.
>
>
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