[Rtk-users] sart for planar tomosynthesis

[Simon Rit]

Hi Robert,
I'm not sure I understand what your tomosynthesis does. But what I would do
is fix all geometric parameters to constant values, including the angles
(gantry, inplane, outofplane), except SourceOffsetX, SourceOffsetY,
ProjectionOffsetsX, ProjectionOffsetsY. In any case, I would not modify the
object size and positions, this is a given in practice. If you want to
cover your object, just use a larger detector.
Good luck,
Simon

On Tue, Mar 3, 2015 at 3:56 PM, "Robert Calließ" <Robert.Calliess at gmx.de>
wrote:

> Hello,
> I know that RTK's primary use is the field of a circular trajectory. But
> if one would
> use the the RTK for tomosynthesis the first choice's algorithm would be the
> S-ART.
>
> Following situation. The Focus is fixed. The object only moves in the xy
> plane and also the
> detectors, for instance flat panel detectors. So that a virtually line
> would always goes from
> the focus through the object center and ends in the detector's center.
> I wonder how to handle the different geometry settings for this kind of
> reconstruction.
> What I mean is, that with a circular trajector the parameters FOD, FDD and
> ODD always
> remain the same because we are rotationg around an axis. But for the case
> of planar
> tomosynthesis the FOD, FDD will be different from the orthogonal view.
> Usually we calculate the physical size of the object based on the FOD and
> FDD to get sure
> that the object fits within the cone.
> But now for the case of a planar tomosynthesis do one need to recalculate
> the object size
> so that the object fits into the current cone beam or do one work with the
> object size calculated
> for the center view (orthogonal view, where the original FOD, FDD are
> given) ?
>
> I think if I would resize the object for every viewing position this would
> change a lot for the
> reconstruction result as I also change the "ray paths".
>
> Does anyone has experiences with this kind of reconstruction ?
>
>
> best regards,
> Robert C.
>
>
>
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