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

[Simon Rit]

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 <gwoodstccd at 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.rit at 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 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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>
>
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