[Rtk-users] Elekta / kV-kV image Reconstruction and Test dataset

[Simon Rit]

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 at 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.
>
>
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