[Rtk-users] Tomosynthesis Reconstruction using RTK

[Simon Rit]

Hi,
When the source moves, along which axis of the detector is it? I would have
expected it to move along the X axis.
There is another option to set the geometry that might be easier for you,
Reg23ProjectionGeometry
<http://www.openrtk.org/Doxygen/classrtk_1_1Reg23ProjectionGeometry.html>.
In any case, your scheme is wrong and I agree with Louie, you should think
of the source parameters as the coordinates if all angles are set to 0 so
in your case sdd==sid.
Simon

On Tue, Nov 4, 2014 at 5:17 PM, louie L <ghostcz at hotmail.com> wrote:

> Hi Andria,
>
> Can you explain the setup with some more details? Which is the axis of
> rotation?
> I think if the isocenter is on the detector, the sid should be set equal
> to the sdd.
>
> Best regards,
> Louie
>
> Greetings from my iOS!
>
> On 04 Nov 2014, at 17:04, Hadjipanteli Andria (ROYAL SURREY COUNTY
> HOSPITAL NHS FOUNDATION TRUST) <andria.hadjipanteli at nhs.net> wrote:
>
>
>  Dear all,
>
> We used the FirstReconstruction.cxx code with minor changes to reconstruct
> a digital breast tomosynthesis stack of projections acquired using a
> Hologic Selenia Dimenions system. Unfortunately, the reconstructed image
> does not look as expected.
>
> The characteristics of the geometry of the system are that the detector
> remains stationary while the x-ray tube moves around a centre of rotation
> located at the detector (see attached diagram). The changes we made to
> FirstReconstruction.cxx so that it represents the Hologic Geometry are that
> the sdd and sourceOffesetY both vary as a function of the rotation of the
> source (sid*sin(angleTheta) and sid*cos(angleTheta) respectively) while in
> all cases gantryAngle= 0, sid = 700 mm and isox = -detectorWidth/2. Our
> geometry definition is:
>
> geometry->AddProjection(700,sdd,0,-isox,0,0,0,0,sourceOffsetY);
>
> Please let me know if you have any ideas on what we might be doing wrong.
>
>
> Thank you for your help.
>
> Kind regards,
>
> Andria
>
>
>
>
>
>
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> <NCCPM_TomoGeometry.pdf>
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