Please stay on the mailing list, the conversation might be interesting for other users. You can use two projections and launch the reconstruction but the result will be far from a 3D image of the object. Check for example figure 7 in doi.org/10.1016/j.media.2010.03.005. I doubt Varian or IBA claim 3D reconstruction from 2 projections... Simon
On Fri, May 21, 2021 at 9:35 AM gwoodstccd <gwoodst...@protonmail.com> wrote: > Hi Simon， > > Thank you for quick response. > > About question 2, Two projections are at different angle. The first image > is AP direction, the second is LR direction. Can these make reconstruction? > > I know some proton/photon Radiotherapy device can reconstruct these > images, like Varian TrueBeam/Probeam, IBA Proteus. > > > BR, > George > > ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐ > On 2021年5月21日FridayPM3点21分, Simon Rit <simon....@creatis.insa-lyon.fr> > wrote: > > Hi, > 1. Yes, simply change the dimension and origin to make it 3D, for example > to --dimension 1024 --origin -127.875 which will set the same values for > the three dimensions. > 2. No, you need more than 2 projection to reconstruct a 3D image. I think > you need to read some books on tomography to understand this. > 3. There are a few datasets on the RTK wiki. You can find some datasets > for lungs and liver here <https://image-x.sydney.edu.au/spare-challenge/>. > Best regards, > Simon > > On Fri, May 21, 2021 at 6:46 AM gwoodstccd via Rtk-users < > rtk-users@public.kitware.com> wrote: > >> Hello all, >> >> I'm one newbie for ITK/RTK. I have some programming experience, but for >> image processing is totally new for me. >> >> I have 3 basic questions: >> >> 1. when I run example for reconstructing Elekta CBCT sequence from >> https://wiki.openrtk.org/index.php/RTK/Examples/ElektaReconstruction. >> >> . Reconstruct elekta-data using RTK applications such as rtkfdk >> algorithm. In this case, we reconstruct just one axial slice (29.5) of the >> whole volume: >> >> rtkfdk \ >> --lowmem \ >> --geometry elektaGeometry \ >> --path img_1.3.46.423632.135428.1351013645.166/ \ >> --regexp '.*.his' \ >> --output slice29.5.mha \ >> --verbose \ >> --spacing 0.25,0.25,0.25 \ >> --dimension 1024,1,1024 \ >> --origin -127.875,29.5,-127.875 >> >> >> In this step, only one axial slice is reconstructed to *.mha file. My >> question is that can I reconstruct all slices as one 3D image file? >> >> 2. I have two kV-kV images, they are orthogonal. Can I use RTK to >> reconstruct 3D image? If yes, one guideline or example is welcome. >> >> 3. Could someone please share me some free test dataset for radiotherapy >> CBCT IGRT purpose including PlanCT and CBCT sequence? I want to use these >> data for reconstruction and registration with ITK and RTK? >> >> Much appreciated for responses. >> >> George Woods >> >> Sent with ProtonMail <https://protonmail.com> Secure Email. >> >> >> _______________________________________________ >> Rtk-users mailing list >> Rtk-users@public.kitware.com >> https://public.kitware.com/mailman/listinfo/rtk-users >> > >
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