Hi, I have finally taken the time to reproduce and correct for the bug, see https://github.com/SimonRit/RTK/pull/380. Sorry for the delay... Simon
On Tue, Jun 30, 2020 at 6:45 AM Brani Rusanov <brani_rusa...@hotmail.com> wrote: > Sorry I forgot to mention, the Parker message only appears when > reconstructing with CUDA enabled. > > ------------------------------ > *From:* Simon Rit <simon....@creatis.insa-lyon.fr> > *Sent:* Tuesday, 30 June 2020 5:22 AM > *To:* Brani Rusanov <brani_rusa...@hotmail.com> > *Cc:* rtk-users@public.kitware.com <rtk-users@public.kitware.com> > *Subject:* Re: [Rtk-users] Insufficient Data For Proper Parker Weighting > > Hi, > No, I don't really understand what you're describing. It's probably easier > if you can share the RTK geometry file and the header of your projection > images (no need to share the data, I'll simulate some). > Thanks, > Simon > > On Mon, Jun 29, 2020 at 5:51 AM Brani Rusanov <brani_rusa...@hotmail.com> > wrote: > > Hi Simon, > > Sorry for the late reply, I have been quite busy recently. > My projections are 1024x768. I cropped the largest dimension and noticed > that "half the beam angle" value decreases slightly, gets close to the > value 9.951, but with further reduction in dimension size the beam angle > suddenly jumps to ~20 degrees (observed value during reconstruction). So > cropping the projection does not seem to solve the problem. Do you have any > ideas how to fix this? > > If you require any geometry or projection files, I would be happy to send > them over. > > Kind regards, > Brani > ------------------------------ > *From:* Simon Rit <simon....@creatis.insa-lyon.fr> > *Sent:* Monday, June 15, 2020 8:59:19 PM > *To:* Brani Rusanov <brani_rusa...@hotmail.com> > *Cc:* rtk-users@public.kitware.com <rtk-users@public.kitware.com> > *Subject:* Re: [Rtk-users] Insufficient Data For Proper Parker Weighting > > Hi, > You are getting this because RTK detects that the scan is too short. > Parker weighting requires pi + the fan-angle to be able to reconstruct > exactly the central slice of your scan. Check here > <https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2FSimonRit%2FRTK%2Fblob%2Fmaster%2Finclude%2FrtkParkerShortScanImageFilter.hxx%23L139&data=02%7C01%7C%7Cdd34d79ef19149c0573e08d81c72539c%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637290624638730119&sdata=ULmc3xlN2%2FTJlHJpo%2FYGvVLVayVbnewu8r%2B%2FrhVD6Ew%3D&reserved=0> > how this is calculated in RTK. > Possible solutions are cropping the projections to reduce the fan angle. > I'm not sure what are the consequences but they'll probably be small since > not much is missing in your case. It's even likely that RTK could be > improved by discretizing differently the integral in parker weighting, in > which case you'd get enough projections. > Simon > > > On Mon, Jun 15, 2020 at 10:56 AM Brani Rusanov <brani_rusa...@hotmail.com> > wrote: > > > Hi, > > I am attempting to reconstruct Varian raw cone-beam data. The specific > type of scan is a short scan, 200 degrees generating 501 projections. > During reconstruction I get the message: “you do not have enough data for > proper Parker weighting (short scan) Delta is 9.951 degrees and should be > more than half the beam angle I.e. 11.2359 degrees.” > > Since I have not generated the geometry myself, rather, used a pre-set > Varian protocol, I am unsure why I get this error. > > How could I rectify this issue? Furthermore, what consequences are there > to not applying a Parker weighting? > > The geometry header is attached. > > Your response is greatly appreciated, > Brani > _______________________________________________ > Rtk-users mailing list > Rtk-users@public.kitware.com > https://public.kitware.com/mailman/listinfo/rtk-users > <https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpublic.kitware.com%2Fmailman%2Flistinfo%2Frtk-users&data=02%7C01%7C%7Cdd34d79ef19149c0573e08d81c72539c%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637290624638740143&sdata=rfrMAQf4nej0oPrbyDcIHHLvGGTVDUQaL1aqW7BnleE%3D&reserved=0> > >
_______________________________________________ Rtk-users mailing list Rtk-users@public.kitware.com https://public.kitware.com/mailman/listinfo/rtk-users