[Rtk-users] CBCT reconstruction

[Simon Rit]

Hi,
It's hard to help without having a look at your dcm files. From the
screenshot, it seems that your projections are very small, I would check
the pixel size of them and whether they are centered.
Simon

On Fri, Nov 26, 2021 at 9:44 AM Attila Nagy <anagy at spinotron.hu> wrote:

> Hi,
>
> I have 20 projections of a target and I would like to understand what can
> I do wrong because my result is bad.
>
> So, here are the parameters of the system:
>
>    -
>
>    SID: 83.9 cm
>    -
>
>    SDD: 131.0 cm
>    -
>
>    SourceOffsetY: 1.42 cm
>    -
>
>    SourceOffsetX: 1.42 cm
>    -
>
>    DetectorOffsetY: -1.07 cm
>    -
>
>    DetectorOffsetX: -1.07 cm
>    -
>
>    Gantry Angle: depends on the particular projection.
>
>
> The detector is a Mercu1717V. Pixel matrix is 3072x3072, the detector
> effective area is: 427.008×427.008mm
>
> I ran these commands:
> rtksimulatedgeometry.exe -o geometry.xml -f 0 -n 20 --sdd 1310 --sid=839
> --proj_iso_x=0 --proj_iso_y=0 --source_x=0 --source_y=0
> rtkfdk -g geometry.xml -p ./dcm -r .*.dcm -o fdk.mha --hann 0.5 --pad 1.0
> --verbose
>
> and the result is:
> https://gyazo.com/1aec04c1be241e39c483e208ded2bc86
>
> The proj_iso_* and source_* parameters are 0 because I got an error with
> the values above.
>
> I'm new in the RTK and CBCT world so I have to learn a lot of these things.
>
> Thank you for any help!
>
> Regards,
> Attila Nagy
> Spinotron Magyar Sugársebészeti Innováció Kft. - http://www.spinotron.hu/
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