[Rtk-users] Varian reconstruction question

[Simon Rit]

Hi Dave,
Regarding the parameters (I-zero, wpc, scatter etc), we still need to
create wiki pages to describe this (as agreed on during the Jul 31 meeting
<http://wiki.openrtk.org/index.php/RTK/Meetings/OnImageQualityInStaticCBCT>).
In the meantime, you'll find some info in each filter documentation. You
can go to the projection pre-processing filter
<http://www.openrtk.org/Doxygen/classrtk_1_1ProjectionsReader.html>, look
at the (complex) clickable graph and try to navigate in it. For example, I0
is for the LUTbasedVariableI0RawToAttenuationImageFilter and (therefore),
inapplicable to Varian data as is.
I'll keep the mailing list posted when we add info to the wiki. Good luck,
Simon

On Thu, Oct 15, 2015 at 9:09 AM, Chao Wu <wuchao04 at gmail.com> wrote:

> 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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>>
>
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