[Rtk-users] Issues using PhaseGatingImageFilter

[Simon Rit]

Great, it's been pushed
<https://github.com/SimonRit/RTK/commit/6558907432ee46c1be15ac64288c613bdfd0df3f>
.
Simon

On Mon, Nov 3, 2014 at 4:15 PM, Geoff Hugo <gdhugo at vcu.edu> wrote:

> Hi Simon,
>
> Yes, this was what I was thinking as well.  Thanks for implementing it, it
> worked fine.
>
> Geoff
>
> ------------------------------------
> Geoffrey D. Hugo, Ph.D.
> Associate Professor, Radiation Oncology
> Director, Medical Physics Graduate Program
> Virginia Commonwealth University
> (804) 628 3457
>
>
> On Nov 1, 2014, at 7:22 AM, Simon Rit <simon.rit at creatis.insa-lyon.fr>
> wrote:
>
> > Hi Geoff,
> > I agree with your analysis, PhaseGatingImageFilter is not adequate for
> > streaming, which is not surprising since Cyril uses it for iterative
> > reconstruction and he typically works with the full stack of
> > projections in RAM. I think there is a simple solution: move the
> > update of the geometry from the GenerateData to the
> > GenerateOutputInformation. That should solve the issue for you.
> > Enclosed is a change suggestion, can you give it a try in the
> > application you have built?
> > I'll commit it if it helps,
> > Simon
> >
> > On Fri, Oct 31, 2014 at 9:29 PM, Geoff Hugo <gdhugo at vcu.edu> wrote:
> >> I’m trying to use the PhaseGatingImageFilter class to reconstruct a
> single
> >> breathing phase volume and am running into some problems.  I’ve
> incorporated
> >> this class into an application similar to rtkfdk, putting it in the
> pipeline
> >> between ParkerShortScanImageFilter and
> FDKConeBeamReconstructionFilter.  If
> >> I run the application trying to select a subset of projections using the
> >> method SetGatingWindowCenter, I get a segmentation fault.  The fault is
> >> occurring due to allocation errors in
> >> rtk::BackProjectionImageFilter::GenerateInputRequestedRegion.  It
> appears
> >> that since the geometry specific to the selected projections is
> selected in
> >> PhaseGatingImageFilter::GenerateData, there is a disconnect between the
> >> geometry size and projection stack size during
> GenerateInputRequestedRegion
> >> in the pipeline (pipeline OutputInformation shows the projection stack
> size
> >> is equal to the size of the selected breathing phase projections, but
> the
> >> geometry size is still the total number of (unsorted) projections).
> >>
> >> I can workaround this problem by calling
> PhaseGatingImageFilter->Update(),
> >> but I think this will break the streaming functionality?  Any easy
> solutions
> >> to this problem that will preserve streaming and let me run the full
> >> pipeline with only one Update call?  My guess is I will need to move the
> >> geometry subselection to
> PhaseGatingImageFilter::GenerateOutputInformation()
> >> then call UpdateOutputInformation in the main application?
> >>
> >> Thanks,
> >> Geoff
> >>
> >> ------------------------------------
> >> Geoffrey D. Hugo, Ph.D.
> >> Associate Professor, Radiation Oncology
> >> Director, Medical Physics Graduate Program
> >> Virginia Commonwealth University
> >> (804) 628 3457
> >>
> >>
> >>
> >> _______________________________________________
> >> Rtk-users mailing list
> >> Rtk-users at public.kitware.com
> >> http://public.kitware.com/mailman/listinfo/rtk-users
> >>
> > <rtkPhaseGatingImageFilter.txx>
>
>
>
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