Hi, I have added an example here: http://wiki.openrtk.org/index.php/FanBeam The values in the first and the third rows are not used, as illustrated in this example. We add them to do a 2D interpolation but we do this 2D interpolation exactly on the second row so that's not a problem. Note that it's a bit more tricky for iterative recon but we also have a solution for this if you need it. Best regards, Simon
On Mon, May 15, 2017 at 4:31 PM, Jacob Frøsig <j...@force.dk> wrote: > Hi again, > > > > Thank you for the quick answer! An example would be great, thanks. I have > one concern about copying the fan-beam data: > > > Then we would have 2D projections for which each column is the same > fan-beam projection. By this, values of the same row are equal even though > the cone-beam geometry indicates the outer columns correspond to > intensities of rays with longer travel time through the object and hence > should have attenuated more. Is this neglectable? > > > > Again, thanks! > > > > Best regards, > > Jacob > > > > > > > > *From:* simon....@gmail.com [mailto:simon....@gmail.com] *On Behalf Of *Simon > Rit > *Sent:* 15. maj 2017 16:05 > *To:* louie L <ghos...@hotmail.com> > *Cc:* Jacob Frøsig <j...@force.dk>; rtk-users@public.kitware.com > *Subject:* Re: [Rtk-users] Reconstructing from fan-beam projections > > > > Hi, > > I agree. What I do is do a 3 slice sinogram from the fan-beam projections > by copying the same data in each slice but reconstruct one 2D slice. If you > need an example, I can quickly demonstrate this in a short Python script. > > Simon > > > > On Mon, May 15, 2017 at 4:01 PM, louie L <ghos...@hotmail.com> wrote: > > Hi, > > > > I think you can carefully pad zeros to your projections. Reconstruct as if > it is a 3d object. Take the middle slice as your fanbeam result. > > Let me know if it helps. > > > > Best regards, > > Louie > > Sent from my iOS > > > Am 15.05.2017 um 15:55 schrieb Jacob Frøsig <j...@force.dk>: > > Dear Rtk-users > > > > I was wandering if Rtk includes an implementation of a reconstruction > method to reconstruct a 2D representation of an object given fan-beam > projections. > > Or, if anyone has experience using e.g. FDKConeBeamReconstructionFilter > on projections from line-detectors (fan-beam instead of cone-beam). > > > > I hope you guys can help. > > Yours sincerely > > *Jacob Frøsig * > > Project Manager > Sensor Innovation > > FORCE Technology > Park Allé 345 > 2605 Brøndby > Denmark > > Phone: +45 43 25 00 00 <+45%2043%2025%2000%2000> > Direct: +45 43 25 16 43 <+45%2043%2025%2016%2043> > Skype for Business: j...@forcetechnology.com > Fax: +45 43 25 00 10 <+45%2043%2025%2000%2010> > e-mail: j...@force.dk > www: forcetechnology.com > <https://forcetechnology.com?utm_source=mail-signature&utm_medium=email&utm_campaign=EmployeeBranding> > > ************************************************************************* > This email and any files transmitted with it may contain confidential > information intended for the addressee(s) only. The information is not to > be > surrendered or copied to unauthorised persons. If you have received > this communication in error, please notify us immediately by email at: > i...@forcetechnology.com > ************************************************************************* > > _______________________________________________ > Rtk-users mailing list > Rtk-users@public.kitware.com > http://public.kitware.com/mailman/listinfo/rtk-users > > > _______________________________________________ > Rtk-users mailing list > Rtk-users@public.kitware.com > http://public.kitware.com/mailman/listinfo/rtk-users > > >
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