[Rtk-users] MV-CBCT

[Simon Rit]

Dear Faterme,
I don't know anyone who has done that before. I did not even know that the
same database format was used for MV images. Looking at the file you've
sent, the MyFRAME1.DBF has only zeros in the U_CENTRE and V_CENTRE columns
which suggests that the system is not calibrated. This is consistent with
the problem you describe, which indicates a geometry problem.
Good luck,
Simon

On Sun, Jul 16, 2017 at 11:11 AM, fateme shahedi via Rtk-users <
rtk-users at public.kitware.com> wrote:

> Dear RTK users and developers
> I am new to RTK. I have some trouble getting a proper reconstruction. I
> want to use EPID mounted on Elekta linear accelerator to get MV-CBCT
> images. I have 120 projection images (in his format) scanned over (0-357)
> degree of the phantom. The phantom is containing 5 rods of different
> materials (titanium, aluminum, acrylic, air and polyethylene). The
> measurement geometry is as bellow;
> - detector size= 1024*1024 pixels
> - size of each pixel=0.4mm
> -size of each pixel at the isocenter=0.25mm
> -source-to-detector distance=157cm
> -source-to-isocenter distance=100cm
> I used the rtkfdk as bellow;
> [sn at localhost workspace]$ rtkelektasynergygeometry --image_db
> MyIMAGE1.DBF --frame_db MyFRAME1.DBF --dicom_uid 1 -o
> elektaGeometry
> [sn at localhost workspace]$ rtkfdk --lowmem --geometry elektaGeometry
> --path img_1/ --regexp '.*.his' --output slice50.0.mha --verbose
> --spacing 0.25,0.25,0.25 --dimension 1024,1,1024 --origin
> -127.875,50,-127.875.
> I display .mha images with VV , it just show the central rod (air) and
> doesn't show the others  ( although the projections are  megavoltage, I get
> result from some other open-source software for CBCT). I attached the
> geometry file (frame and image.DBF)  with the mail. I need your help
> to know what went wrong.
> I really appreciate any help you can provide.
>
> best regards.
> fateme.
>
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