[Rtk-users] Varian reconstruction question

[sco user]

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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